Trends in Food Science & Technology 99 (2020) 323–336 Contents lists available at ScienceDirect Trends in Food Science & Technology journal homepage: www.elsevier.com/locate/tifs A comprehensive review on antioxidant dietary fibre enriched meat-based functional foods T Arun K. Dasa,∗∗, Pramod Kumar Nandaa, Pratap Madaneb, Subhasish Biswasc, Annada Dasc, Wangang Zhangd, Jose M. Lorenzoe,∗ a Eastern Regional Station, ICAR-Indian Veterinary Research Institute, Kolkata, 700 037, India Division of Livestock Products Technology, ICAR-Indian Veterinary Research Institute, Izatnagar, 243 122, Bareilly, India c Department of Livestock Products Technology, West Bengal University of Animal and Fishery Science, 37 & 68 K B Sarani Road, Kolkata, 700 037, India d Key Laboratory of Meat Processing and Quality Control, Ministry of Education China, Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, College of Food Science and Technology, Nanjing Agricultural University, Nanjing, 210095, China e Centro Tecnológico de La Carne de Galicia, Adva. Galicia N° 4, Parque Tecnológico de Galicia, San Cibrao Das Viñas, 32900, Ourense, Spain b ARTICLE INFO ABSTRACT Keywords: Antioxidant Bioactive compounds Dietary fibre Plant by-products Functional properties Meat products Quality attributes Background: Meat and meat products, in spite of having high biological value protein and essential nutrients required for human sustenance, are highly susceptible to lipid oxidation and also deficient in complex carbohydrates like dietary fibre (DF). This deficiency of DF is often associated with increased occurrence of some chronic diseases such as risk of cardiovascular diseases, type 2 diabetes and colorectal cancer. Besides, development of oxidative changes in meat and meat products needs to be readdressed to prevent the quality deterioration during storage. Scope and Approach: A wide range of plant-derived materials and their by-products are potentially rich sources of DFs and bioactive compounds (phytochemicals) with inherent antioxidant properties, commonly known as antioxidant dietary fibres (ADFs). ADF holds the promise to act as functional ingredient to ameliorate the deficiency in DF as well as oxidative changes in meat products, besides offering health benefits. So, fortification of meat and meat products with functional ingredients (ADFs) having dual properties, therefore, assumes significance. Key Findings and Conclusions: This comprehensive review focuses on the present knowledge in the literature about the sources of ADFs and their potential application as functional ingredients to improve the physicochemical characteristics, oxidative stability, sensory attributes and shelf life of meat and meat products. Considering the positive health effects of ADF, its incorporation in meat products opens up new possibilities for the industry to improve its ‘‘image” and opportunity to address consumer demands. 1. Introduction cellulose, non-cellulosic polysaccharides such as mucilages, pectic substances, hemicelluloses, non-carbohydrate components like lignin and gums (Sharma et al., 2016). Although DF is naturally present in most of the fruits, cereals and vegetables, but the quantity and composition differ from one food to another (Desmedt & Jacobs, 2001). In fact, a fibre-rich diet, although low in fat content and energy density, is greater in volume and micronutrients (Dhingra, Michael, Rajput, & Patil, 2012). Moreover, DF is resistant to enzymatic absorption and digestion in the intestine with complete or partial fermentation in the large intestine of humans (Sharma et al., 2016). But the lack of adequate amounts of DF in our diet is often related to various health disorders such as colon, cardiovascular diseases, obesity and cancer Meat is a good source of high-quality protein, presenting a good balance of essential amino acids, and having high biological value (Lawrie & Ledward, 2006; Lorenzo & Pateiro, 2013). Meat is also an important source of a number of other micronutrients such as selenium, iron, magnesium, potassium, sodium and vitamins (A, B12, folic acid, etc.). The bio-availability of these micronutrients present in meat is much higher than those from plant sources (Biesalski, 2005). In spite of being nutritious and having all the above positive effects, meat has some drawbacks as it is deficient in dietary fibre (DF). Being a part of plant material, DF is a complex mixture of polysaccharides and includes Corresponding author. Corresponding author. E-mail addresses: arun.das@icar.gov.in (A.K. Das), jmlorenzo@ceteca.net (J.M. Lorenzo). ∗∗ ∗ https://doi.org/10.1016/j.tifs.2020.03.010 Received 26 September 2019; Received in revised form 6 March 2020; Accepted 9 March 2020 Available online 13 March 2020 0924-2244/ © 2020 Elsevier Ltd. All rights reserved. Trends in Food Science & Technology 99 (2020) 323–336 A.K. Das, et al. (Eastwood, 1992; Larsson & Wolk, 2006). The era of globalization coupled with rapid urbanization has been a driving factor for shifting an increased number of women workforce and consumers towards convenient fast food products, including meat (Verma, Rajkumar, Banerjee, Biswas, & Das, 2013). But most of the meat products lack minimum contents of DF (Verma & Banerjee, 2010) to fulfil the recommendations of daily fibre intake requirement. According to the American Dietetic Association, the recommended DF intake for an adult should be 25–30 g/day and the insoluble/soluble fibre ratio should be 3:1 (USDA, 2015). This is required since foods containing higher proportion of DFs promote healthier life style and their regular intake is known to reduce several disorders and diseases as mentioned earlier (Eastwood, 1992). This has prompted researchers and food processors to incorporate DF in different formulations offering its positive health benefits and functional properties such as water, fat binding and gelling capacity in meat products. This in turn improves the emulsion stability, viscosity, rheological properties and sensory attributes of meat products (Ağar, Gençcelep, Saricaoğlu, & Turhan, 2016; Bis-Souza, Barba, Lorenzo, Penna, & Barretto, 2019; Hu et al., 2016). Because of the above benefits, extensive studies have been carried out to incorporate different fibre-rich ingredients, such as oat fibre (Claus & Hunt, 1991), peach fibre (Grigelmo-Miguel & Martı́n-Belloso, 1999), apple pulp, bottle gourd, chickpea hull flour (Verma, Banerjee, & Sharma, 2012; Verma, Sharma, & Banerjee, 2010), sugar beet (Ağar et al., 2016), pineapple fibre (Henning, Tshalibe, & Hoffman, 2016), carrot fibre (Eim, Simal, Rossello, & Femenia, 2008), citrus fibre, rice bran (Petridis, Raizi, & Ritzoulis, 2014), sugarcane fibre (Fang, Lin, Ha, & Warner, 2019), dragon fruit peel (Madane et al., 2020) etc., only to name a few in different processed meat products. In recent years, DF has also been utilized as a fat substitute for the production of low-fat meat products (Verma et al., 2012). Lipid oxidation is the main cause of limiting the shelf life and quality of meat and meat products (Lorenzo & Gómez, 2012). Apart from higher proportions of unsaturated fatty acids, meat contains various metal catalysts, haem pigments and a range of oxidizing agents in its muscle tissue (Domínguez et al., 2019). Various processing steps such as chopping, grinding, flaking and emulsification liberate the membrane-bound phospholipids thereby accelerating the lipid oxidation of meat products (Das, Anjaneyulu, & Biswas, 2006; Domínguez, Gómez, Fonseca, & Lorenzo, 2014). The initial lipid oxidation products such as hydroperoxides tend to decompose resulting in formation of hydrocarbons, aldehydes, alcohols, and volatile ketones, among others (Lorenzo, Bedia, & Bañon, 2013). These short-chain carbon compounds impart off-flavours and off-odours to the products (Pearson, Gray, Wolzak, & Horenstein, 1983). Other factors that also influence lipid oxidation are cooking methods, types of ingredients used while processing, packaging and storage conditions (Dominguez, Gómez, Fonseca, & Lorenzo, 2014b; Gómez, & Lorenzo, 2012, 2013). To overcome this oxidation, vegetable oils are added to replace animal fats (Agregán et al., 2018; Domínguez, Agregán, Gonçalves, & Lorenzo, 2016; Domínguez, Pateiro, Agregán, & Lorenzo, 2017; Heck et al., 2017, 2019), but the higher degree of polyunsaturation of vegetable oils accelerates the oxidative processes leading to further deterioration of meat quality and consumer acceptability (Cunha et al., 2018; Echegaray et al., 2018; Fernandes, Trindade, Lorenzo, & de Melo, 2018; Zamuz et al., 2018). Use of antioxidants additives, modified processing technologies, vacuum packaging etc., are efficient strategies to delay the lipid oxidation and off-flavour, which will eventually enhance the shelf life of meat products (Domínguez et al., 2018; Lorenzo et al., 2018a). The inclusion of antioxidants is considered as an effective method to inhibit or delay the lipid oxidation as well as to minimize the formation of toxic compounds such as cholesterol oxidation products, thereby improving the shelf life of products. Synthetic antioxidants such as butylated hydroxytoluene, propyl gallate, tertiary butyl hydroquinone and butylated hydroxyanisol have been widely used in the meat industry, but consumer concerns over safety and toxicity have renewed the interest of food industry in the addition of natural antioxidants (Sen & Mandal, 2017). In this regard, the use of natural additives, especially those obtained from plants or seaweeds, has notably increased due to their safety and positive health effects (Agregán et al., 2018; Lorenzo et al., 2018b). Epidemiological studies have also shown that the intake of natural antioxidants is linked to a lower risk of cancer and cardiovascular diseases (Temple, 2000). Several reports are available to assess the effectiveness of different extracts such as rosemary (Pereira et al., 2017), green tea (Lorenzo, Batlle, & Gómez, 2014; Lorenzo & Munekata, 2016; Pateiro, Bermúdez, Lorenzo, & Franco, 2015), grape seed (Lorenzo, González-Rodríguez, Sánchez, Amado, & Franco, 2013), Moringa oleífera flower (Madane et al., 2019), broccoli powder (Banerjee et al., 2012), cumin seed (Chauhan, Das, Das, Bhattacharya, & Nanda, 2018), pomegranate peel (Naveena, Sen, Vaithiyanathan, Babji, & Kondaiah, 2008; Turgut, Soyer, & Işıkçı, 2016), peanut skin (Lorenzo et al., 2018c) etc., as natural antioxidants and their role in minimizing oxidative degradation of meat and meat products. In fact, both natural antioxidants and DFs are considered as two important dietary fractions involved in promoting human health. So, the addition of ingredients that are a source of DF besides having antioxidant activity could be an opportunity to improve the quality and storage stability of meat products, promoting healthy habits as well (Madane et al., 2019). To counter the above shortcomings (oxidation and low fibre content) related to meat and meat products, meat processors and researchers are continuously searching for various natural products having dual properties (Madane et al., 2019). These natural ingredients with DF and antioxidants are known as antioxidant dietary fibres (ADFs). ADF is defined as the DF concentrate containing significant amounts of natural antioxidants associated with the DF matrix (Goni & Saura-Calixto, 2009). Based on the given criteria, a number of plant materials like mango peel, pineapple shell, dragon fruit peel, guava pulp, acerola fruit and white and red grape pomace and some seaweeds have been reported to contain exceptionally good DF and antioxidant capacity. These fibres combine the physiological effects of both DF and antioxidants in a single ingredient (Goni & Saura-Calixto, 2009). Considering the benefits of both antioxidants and DF, the article reviews the potential use of ADFs as functional ingredients in meat food formulations and their effect on physico-chemical and nutritional value, storage stability and sensory attributes of various meat products. 2. Antioxidant dietary fibre The concept of ADF was firstly proposed by Saura-Calixto (1998). By definition, ADF contains significant contents of natural antioxidants along with the DF matrix which could be used as new functional food ingredients and also can prevent lipid oxidation in food products due to the presence of antioxidant polyphenols. According to Saura-Calixto (1998), the requirements for consideration of any ingredient as an ADF are as follows: • DF content must be higher than 50% on a dry matter basis. • ADF must be able to delay lipid oxidation equivalent to at least • 200 mg of vitamin E (measured by the thiocyanate procedure) and a free radical scavenging activity equivalent to at least 50 mg of vitamin E (measured by the 2, 2-diphenyl-1-picrylhydrazyl method). The antioxidant activity should be of an intrinsic property originated from the natural ingredients of the added materials. This is not related to added antioxidants or any other constituents released through chemical or enzymatic treatment of the original components. 2.1. Sources of antioxidant dietary fibres Apart from cereals, pulses, nuts and seaweeds, many fruits and vegetables meet the criteria of ADF by definition. Even the secondary products or by-products of some fruits and vegetables, obtained mostly 324 Trends in Food Science & Technology 99 (2020) 323–336 A.K. Das, et al. from primary agro-food production processes or food processing industries, fulfil the criteria of ADF definition. But due to their highly perishable nature and seasonal feature, these undervalued yet important plant-derived by-products remain unutilized and are either discarded or eventually utilized as manure and animal feeds. Further, their disposal or discharge create environmental problems (Arvanitoyannis & Varzakas, 2008). As derived from natural plants and a cheaper source of potentially functional ingredients containing rich source of DF along with inherent antioxidant properties, they are of interest to the food processors because of various reasons. First of all, the amount of wastes (peels, pulps, leaves, stems, wastewaters, etc.) and residues generated during processing of vegetables and fruits is enormous and some of them, compared to respective edible portions, contain more DF and phytochemicals (Goñi & Hervert-Hernández, 2011). Keeping in mind the nutritional quality, added value of the ingredients and cost-effectiveness, the functional ingredients, derived from plant co-products and by-products, could be a real boon for the food industry (Puupponen-Pimiä et al., 2002). Their proper utilization by extracting some high value compounds, especially the DF fraction and phenolic components have great potential in functional foods preparation (Arun et al., 2015). The major sources of ADF are by-products from different fruits such as grapes (pomace), lemons (peel and pulp residues), Açaí (Euterpe oleraceae) ‘BRS Pará (pulp), mangoes (peel), bael (pulp residue), banana (peel), pineapple (pulp residues), peach and orange (peel and pulp residues), apricots and pomegranate (peel) and dragon fruit (peel) whereas use of vegetable wastes from carrots, red beets, potatoes (peel), tomatoes, drum stick flowers and cabbages are also reported. The ADF content obtained from various plant-derived co-products and their byproducts is summarized in Table 1. García-Alonso, & Periago, 2011). As far as cocoa beans are concerned, Stahl et al. (2009) reported that cocoa products were excellent source of antioxidants, whereas its DF could be an ideal ingredient in low-calorie food formulations (Lecumberri et al., 2007). According to the researchers, cocoa products with a TPC content of 1.32% had TDF and antioxidant capacity of 60.51% (soluble DF - 10.09%) and 72.32 μmol Trolox eq/g, respectively on DM basis (Lecumberri et al., 2007). In a study on the antioxidant activity of bael (Aegle marmelos L.) pulp residue, Das, Rajkumar, and Verma (2015) reported that the residue had high content of total phenolics (15.16 mg GAE/g dry weight) and DF (56.91g/100g DM). While working on the production of ADF carrot (Daucus carota) peels, Chantaro, Devahastin, and Chiewchan (2008) reported that it contained 45.45 g/100 g DM of DF with a great antioxidant activity (94.67%). Apart from being rich in protein (17.87g/ 100g DM), minerals (7.87g/100g DM) and TPC (18.34–19.48 mg GAE/ g DM), drumstick (M. oleifera) flower contained a good amount of DF (36.14g/100g DM) (Madane et al., 2019). Murthy and Naidu (2012) noticed that coffee bean by-products such as coffee pulp, husk, silver skin, and spent coffee, rich in DF and natural antioxidants compounds, could be considered as good sources of ADF. The researchers also reported that by-products from coffee had 28–80% of TDF and 1.53–2.12 mmol Trolox eq/100 g DM of antioxidant capacity. By-products such as peel and pulp from guava exhibited higher antioxidant capacity (up to 462 μmol Trolox eq/g DM), as they are rich in polyphenols (26.2–77.9 g GAE/kg DM) and higher DF (up to 69.1 g/100 g DM) contents (Jiménez-Escrig, Rincón, Pulido, & Saura-Calixto, 2001). Research findings of Verma et al. (2013) on guava fruit as a source of ADF indicates that its powder has a good amount of DF (43.21%) and TPC (44.04 mg GAE/g). Another important source of ADF is cactus pear (Opuntiaficus indica), fruit or its by-products (cladode or cactus stem) that contained DF (41.83–41.25% of total carbohydrates), while extractable polyphenols were 1.54–3.71 g GAE/100 g DM (Ayadi, Abdelmaksoud, Ennouri, & Attia, 2009). In another study, Bensadón, Hervert-Hernández, SáyagoAyerdi, and Goñi (2010) pointed out that by-products from cladodes (milpa Alta and Atlixco variety), Alfajayucan (green tuna) and Pelon Rojo (red tuna) fruits were good source of ADF as they contained DF (3.75 and 4.01 g/100 g, respectively) and total antioxidant activity up to 57.55 and 66.33 μmol Trolox eq/g DM for the cladodes and fruits, respectively. Recently, Tagliani, Perez, Curutchet, Arcia, and Cozzano (2019) reported that blueberries pomace was not only a rich source of fibres, minerals and vitamins, but also had a strong antioxidant capacity owing to its richness of phenolics compounds (Šarić et al., 2016). Apart from the above important bio-ingredients, blueberries are reported to have promising health promoting effects, as they possess a great amount of flavanols, anthocyanins, phenolic acids, tannins and polyphenols (Szajdek & Borowska, 2008). These pomaces combine the effects of antioxidants activity and DF content, according to the concept “ADF”, as defined by Saura-Calixto (1998). 2.2. Bioactive ingredients in plant-derived materials Different plant-derived materials and their by-products contain bioactive ingredients (DF and associated phenolic compounds) in varying proportions. A study by Fernández-López et al. (2009) reported higher DF (71.62 g/100 g DM) content and phenolics (40.67 mg GAE/g DM) in orange peel. Outer leaves of cabbage species (B. oleracea L. var. capitata), separated during processing as waste, are used as fertiliser or feed for animals. But these leaves are reported to contain up to 571.50 mg GAE/100 g DM total phenolic content (TPC), 89.57–96.00% total antioxidant capacity (TAC) and 41–43% of TDF (Jongaroontaprangsee et al., 2007), so could be applied in food applications as ADF (Nilnakara, Chiewchan, & Devahastin, 2009). Likewise, peel is one of the most underutilized by-products of banana (Musa paradisiaca) processing industries. It contains a good amount of TDF (64.33g/100g), vitamins (folic acid: 33.12 mg/100g) and phenolic and flavonoid content (15.21 and 9.39 mg QE/g dry weight) and therefore, could be used as valuable functional food ingredient (Arun et al., 2015; Zhang, Whistler, BeMiller, & Hamaker, 2005). Likewise, Acai fruit pulp has considerable potential for nutritional and health applications, as it contains DF as high as 71.22 g/100g DM and antioxidant activity (20.73–1514.46 μmol Trolox eq/g DM) due to the presence of good content of polyphenols (1.50g/100g DM) related to pulp (Maria do Socorro et al., 2011). Due to high TDF content (28.05–70.0 g/100 g DM) and wide range of polyphenols (16.14–283 mg GAE/100g), mango fruits and its byproducts such as peel powder and fibre concentrate are considered as good sources of ADF (Ajila, Leelavathi, & Rao, 2008; Martínez et al., 2012). Even, orange by-products such as flavedo, albedo and its pulp are reported to have high dietary fibres and greater amount of flavone, vitamin C and carotenoid than the juice (Escobedo-Avellaneda, Gutiérrez-Uribe, Valdez-Fragoso, Torres, & Welti-Chanes, 2014). Vegetable by-products, i.e. peel from tomato (Solanum lycopersicum), are not only good source of DF (86.15 g/100g DM) but also of phenolics (158.10 GAE/100 g) (Navarro-González, García-Valverde, 3. Role of antioxidant dietary fibres in meat products The purpose of fortifying or enriching food formulations is not only to achieve desired functions i.e. restore or increase yield and nutritive values, enhance sensory attributes by influencing its physico-chemical properties, but also to extend the product's shelf life by inhibiting oxidation and microbial growth during storage (Xiong, 2012). In case of meat food processing, both synthetic chemical compounds and natural ingredients, generally regarded as safe (GRAS), are regularly being used as functional non-meat additives to regulate or modify finished product's quality and safety. The ingredients or compounds obtained from natural sources are of great interest because of their safety and health characteristics (Fasseas, Mountzouris, Tarantilis, Polissiou, & Zervas, 2008). These functional ingredients not only influence the physicochemical characteristics of meat products but also enrich their nutritive and functional value. A schematic diagram showing effects of ADFs on 325 Trends in Food Science & Technology 99 (2020) 323–336 A.K. Das, et al. Table 1 Sources of antioxidant dietary fibres from plant-derived co-products and by-products. Sources Dietary fibres (%) Phenolics content (mg GAE/100g) Antioxidant capacity References Mango (Mangifera indica L.) peel flour TDF: 54.20 SDF: 20.00 IDF: 34.20 TDF: 36.70 CF: 19.92–47.47 TDF: 40.89 SDF: 7.35 IDF: 33.54 TDF: 48.55 IDF: 46.72 SDF: 1.83 TDF: 49.42 IDF: 47.25 SDF: 1.77 TDF: 51.52 IDF: 50.16 SDF: 1.48 TDF: 40.86 IDF: 39.19 SDF: 1.53 TDF: 5.76 IDF: 3.92 TDF: 5.69 IDF: 4.46 TDF: 5.43 IDF: 3.65 TDF: 71.22 IDF: 68.49 SDF: 2.75 TDF: 42.00–61.00 SDF: 0.90–4.10 IDF: 21.00–64.00 TDF: 74.0 ± 3.40 TPC: 2170 DPPH Activity: 80.0% TFC: 2240 mg/100g Noor, Siti, and Mahmad (2015) Cabbage powder Cabbage powder (outer leaves) Cabbage (outer leaves) Guava (Psidium guajava) peel Guava (P. guajava) pulp Guava (P. acutangulum) peel Guava (P. acutangulum) pulp Annona muricata L. Crioula (matured) A. muricata L. Lisa (matured) A. muricata L Morada (matured) Açaí (Euterpe oleraceae) ‘BRS Pará’ (fruit pulp) Durum wheat by-product (Bran & Brain 50 and 70) Red grape pomace Apple pomace Coffee (pulp, husk, silver skin, and spent coffee) Blueberry pomace powder Carrot (peels) Banana (peels) Grape (Vitis vinifera) by-products (pomace) Manto Negro grape (V. vinifera) byproducts (stem) Orange (Citrus aurantium) peel Orange (C. aurantium) pulp Wine grape pomace Plantain peel (flour) Persimmon (fresh fruit) Mango peel powder Mango kernel powder Upat Lengra (Achyranthes aspera L.) leaves Kalokeshi (Eclipta alba L.) leaves Nirgundi (Vitex negundo L.) leaves TPC: 322 (TAE)* TPC: 571.50 TPC: 739.24 TAC: 89.57–96.00% – Malav et al. (2015) Nilnakara et al. (2009) Tanongkankit, Chiewchan, and Devahastin (2010) TEP: 5871 – Jiménez-Escrig et al. (2001) TEP: 2630 – TEP: 5870 – TEP: 2630 – TPC:188.55 – TPC: 358.92 – TPC: 264.65 – TEP: 1500 – Maria do Socorro et al. (2011) – AOC: 1.1–1.2 mM TE/100 g Esposito et al. (2005) TPC: 5.63 – TDF: 51.10 SDF: 14.60 IDF: 36.50 TDF: 28.00–80.00 IDF: 8.00–64.00 SDF: 16.00–35.00 DF: 26.15 TDF: 28.80 SDF: 11.00 IDF: 17.80 TDF: 41.60 SDF: 9.60 IDF: 32.00 TDF: 74.50 IDF: 63.70 SDF: 10.80 TDF: 77.20 IDF: 73.50 SDF: 3.77 TDF: 33.10–36.50 TDF: 22.60–28.30 TDF: 61.32 IDF: 59.88 SDF: 1.44 TDF: 37.64 SDF: 7.30 IDF: 30.34 TDF: 1.20–1.76 SDF: 0.52–0.92 CF: 9.33 CF: 0.26 TDF: 18.65 TPC: 1016 – Sánchez-Alonso, Jiménez-Escrig, Saura-Calixto, and Borderías (2007) Sudha, Baskaran, and Leelavathi (2007) TPC: 1020-1480 AOC: 1.53–2.12 mM TE/100 g Murthy and Naidu (2012) TPC: 28,514 TPC: 2890.7 TAC: 339.09 μM TE/g – Tagliani et al. (2019) Salama, Abozed, and Abozeid (2019) TPC:7168.5 – TEP: 2630 TAC:162 (vit.E mg/g) TAC: 61 (vit.C mg/g) TEP:11,600 TAC: 495 (Vit. E mg/g) TAC: 187 (Vit. C mg/g) TPC: 0.51 TPC: 0.42 TPC: 6774 – – – Garau, Simal, Rossello, and Femenia (2007) TEP: 771 TAC: 84.73 μM TE/g Agama-Acevedo, Sañudo-Barajas, Vélez De La Rocha, González-Aguilar, and Bello-Perez (2016) TPC: 190-221 – Gorinstein et al. (1999) TPC: 1906 TPC: 2390 TPC: 6884 RSA: 93.89% RSA: 95.08% TEAC: 250.18 μM TE/100 g Ashoush & Gadallah (2011) TDF: 20.28 TDF: 19.70 TPC: 5532 TPC: 7211 TEAC: 184.31 μM TE/100 g TEAC: 282.41 μM TE/100 g Siqueira, Moreira, Melo, Stamford, and Stamford (2015) Llobera and Cañellas (2007) Tseng and Zhao (2013) Rana, Alam, and Akhtaruzzaman (2019) (continued on next page) 326 Trends in Food Science & Technology 99 (2020) 323–336 A.K. Das, et al. Table 1 (continued) Sources Dietary fibres (%) Phenolics content (mg GAE/100g) Antioxidant capacity References Viburnum opulus (fruits) TDF: 38.44 SDF: 6.82 IDF: 31.62 TDF: 45.39 SDF: 2.93 IDF: 42.46 TDF:59.34 SDF: 1.13 IDF: 58.20 TDF: 59.02 IDF:47.83 SDF: 11.46 TDF: 44.26 IDF:38.35 SDF: 5.90 TDF: 15.07 IDF:12.18 SDF: 2.89 TPC: 3730 Flavonoids: 2010 mg CE/100 g ABTS: 26.57 mM TE/100 g FRAP: 19.29 mM TE/100 g Flavonoids:1670 mg CE/100 g ABTS: 16.18 mM TE/100 g FRAP: 13.65 mM TE/100 g Flavonoids: 2250 mg CE/100 g ABTS: 40.21 mM TE/100 g FRAP: 23.47 mM TE/100 g CT: 5216 mg/100g ABTS: 51.87 μM TE/g FRAP: 129.5 μM TE/g ABTS: 5422.38 mg AAE/100 g DPPH: 13656.27 μM TE/100 g FRAP: 12511.44 μM Fe(II)/100 g DPPH: 73.14% inhibition Polka, Podsędek, and Koziołkiewicz (2019) V. opulus (flowers) V. opulus (bark) Cacao pod husk product (fresh) Mexican Blackberry (Rubus fruticosus) Residues cv. Tupy Quinoa (Chenopodium quinoa) TPC: 3510 TPC: 3980 SP: 6893 TPC: 4016.43 TPC: 31.92 Yapo, Besson, Koubala, and Koffi (2013) Zafra-Rojas et al. (2018) Miranda et al. (2013) AAE-Ascorbic acid equivalent; ABTS+- 2,2′-azino-bis-(3-ethyl-benzothiazoline-6-sulfonic acid); AOC-Antioxidant capacity; CE-Catechin equivalents; CF-Crude fibre; CGA-Chlorogenic acid; CT-Condensed tannins; FRAP- Ferric reducing antioxidant power; DPPH-1,1-diphenyl-2-picrylhydrazyl; GAE-Gallic acid equivalent; IDFInsoluble dietary fibre; NEP-Non-extractable polyphenols; SDF- Soluble dietary fibre; NSC- Non-soluble carbohydrate; RSA-Radical scavenging activity; SP-Soluble phenolics; TAC-Total antioxidant content; *TAE–Tannic acid equivalent; TDA-Total dietary fibre; TEAC-Trolox equivalent antioxidant capacity; TEP-Total extractable phenol; TFC- Total flavonoid contents; TE-Trolox equivalent; TPC: Total phenolics content; - Not determinated. Fig. 1. Schematic diagram showing effects of antioxidant dietary fibre on quality attributes of meat and meat products. quality attributes of meat and meat products is depicted in Fig. 1. Rapid urbanization coupled with changing food habits and lifestyles of consumers for ready to eat healthier meat products has prompted the meat processors to use safe additives or bioactive compounds from natural sources to answer this challenge. From the above point of view, natural ingredients like DF associated with polyphenolic compounds (known as ADF) have both physiological effects of DF and antioxidants in a single material (Saura-Calixto, 1998). These functional ingredients not only improve the oil and water retention, emulsion and oxidative stability (Goñi & Hervert-Hernández, 2011), but also impart antimicrobial and anti-inflammatory activity (Ho, 1992). Literatures available in this aspect indicate that use of ADF in many commonly and regularly consumed food products enhance the bioactive compounds (antioxidants) and DF level in finished food products. For example, macaroni prepared using mango peel powder has been reported with increased DF from 8.6 to 17.8%, polyphenols from 0.46 to 1.80 mg/g and carotenoid content from 5 to 84 μg/g resulting in improved nutritional value and storage stability without changing its textural, cooking, and sensory attributes (Ajila, Aalami, Leelavathi, & Rao, 2010). Likewise, several reports are available enriching ADF in meat products derived from various sources such as durum wheat bran (Esposito et al., 2005), chia seed (Reyes-Caudillo, Tecante, & Valdivia-López, 2008), grape seed (Sáyago-Ayerdi, Brenes, & Goñi, 2009), guava 327 Cooked chicken nuggets Functional mutton patties Spent hen nuggets Drumstick (Moringa oleifera) flower (1.0 and 2.0%) Cabbage powder (6.0%) Gooseberry pulp powder (GPP-0.5%) Seed coat powder (GSCP1.5%) Cooked sausages (bolognas) and drycured sausages Lemon albedo -raw and cooked (2.5, 5.0, 7.5 and 10.0%) Cooked sausages (bolognas) TDF: 2.49 IDF: 67.00 SDF: 33.00 Sheep meat nuggets Bael pulp residue (0.25 and 0.5%) Orange fiber powder (0.5, 1.0, 1.5 and 2.0%) TDF: 56.90 IDF: 56.48 SDF: 0.43 Sheep meat nuggets Guava (Psidium guajava L.) (0.5 and 1.0%) 328 TDF:53.46 IDF: 46.98 SDF:6.49 TDF: 36.70 TDF: 36.14 SDF: 3.90 IDF: 32.24 NSC: 5.17 TDF: 2.49# IDF: 67.00 SDF: 33.00 TDF: 43.21 IDF: 42.56 SDF: 0.65 TDF:64.60 Chicken hamburgers (raw and cooked) Red grape pomace (0.5, 1.0, 1.5 and 2.0%) Dietary fibre (%) Application in muscle foods ADF and level used AOC: 86.47% FRAP: 0.29 DPPH: 41.87% FRAP: 0.54 DPPH: 68.52% IC50: 126.20 ppm DPPH: 73.42% ABTS: 8.65–14.40 mM TE/g FRAP: 1.62–6.60 mM TE/g FRAP: 0.089 DPPH: 45.00% FRAP: 0.13 DPPH: 60.01% LOI: 400 mg dl-α-tocopherol/g DPPH: 100 mg dl-α-tocopherol/g Antioxidant capacity Table 2 Summary of antioxidant dietary fibres and their effect on meat and meat product formulations. TPC: 3087 TPC: 322 (TAE)* TPC: 1834–1949 TPC: 179 TPC: 190 TPC: 1516 TPC: 4404 TEP: 4900 Phenolics content (mgGAE/100g) Refrigerated at 4 ± 1 °C for 20 days Refrigerated aerobic packaging for 21 days and vacuum packaged for 45 days Refrigerated at 4 °C up to 20 days Vacuum-packed at 4 °C for 28 days under dark and light exposure – Refrigerated at 4 °C for 21 days Refrigerated at 4 °C for 15 days Refrigerated at 4 °C up to 13 days Storage conditions ✓ Increased redness ✓ Retarded and inhibited lipid oxidation ✓ No adverse effect on product acceptability ✓ Increased TDF and phenolics ✓ Improved product redness ✓ No change in textural properties (except shear force and springiness) ✓ Inhibited lipid peroxidation ✓ No adverse influence on sensory attributes ✓ Improved emulsion stability, cooking yield, TDF and phenolics ✓ Inhibited lipid peroxidation ✓ Decreased hardness ✓ Improved appearance ✓ Lowered residual nitrite level ✓ Lighter coloured product ✓ Significant effect on sensory scores ✓ Increased hardness ✓ Increased product colour (redness) ✓ Increased hardness ✓ Product less elastic and chewy compared to control ✓ Improved oxidative stability and odour scores ✓ Reduced redness ✓ Decreased hardness, gumminess and chewiness compared to control ✓ Improved oxidative stability ✓ Improved sensory scores ✓ Improved textural and colour properties ✓ Better nutritive values ✓ Improved physico-chemical and sensory properties ✓ Improved shelf-life ✓ Better acceptability of product Properties (continued on next page) Goswami, Prajapati, Solanki, Nalwaya, and Shendurse (2019) Vega-Gálvez et al. (2015) Mayachiew and Devahastin (2008) Malav et al. (2015) Madane et al. (2020) Hegazy and Ibrahium (2012) Fernandez-Lopez et al. (2004) Das et al. (2015) Verma et al. (2013) Sáyago-Ayerdi et al. (2009) Reference A.K. Das, et al. Trends in Food Science & Technology 99 (2020) 323–336 329 Low-salt beef patties (raw and cooked) Frankfurters Ham pâté Chicken sausage Seaweed in cooked beef patties Pork and turkey sausages (Viennatype) Chicken nuggets Wakame sea weed (Undaria pinnatiflda) (3.0%) Walnut (25%) Kiwi fruit (Actinidia deliciosa) skin flour (0.5, 1.0 and 2.0%) Raw sugarcane fibre (3.0% fibre and 10.0% water) Rehydrated seaweed (Himanthalia elongate) (10, 20, 30 and 40%) Pineapple pomace Dragon fruit (Hylocereus undatus) peel (1.5% and 3.0%) TDF: 56.91 SDF: 7.69 IDF: 49.22 TDF = 88.40 SDF = 75.10 IDF = 13.30 TDF:4.02 TDF: 79.50 IDF: 75.70 SDF: 3.80 DF: 28.79 TDF: 5.00–9.00 (Insoluble and phytate-rich) TDF: 40.95 SDF: 12.53 IDF: 28.42 Dietary fibre (%) DPPH: 59.66% IC50: 586 ppm FRAP = 35.69 μmol TE/g ABTS+ assay = 7.42 μmol TE/g Carotenoids = 4.37 mg eq βcarotene/kg TAC: 7392.40 μmol TE/kg PGE: 2041.60 mg/kg – FRAP: 357.5 μmol TE/100 g FRAP: 154.88 μmol TE/g AOC: 7850 mg TE/L AOC: 1.09 mmol TE/g Antioxidant capacity TPC: 39 Polyphenols: 492 TPC: 15,130 TPC: 45.17 TPC: 1262.3 Polyphenol: 560 TPC: 660 (PGE)** DPPH EC50: 45.86 Phenolics content (mgGAE/100g) Refrigerated at 4 °C up to 20 days – Refrigerated at 4 °C for 30 days – Refrigerated at 4 °C for 63 days Refrigerated at 2 ± 2 °C until analysis – Storage conditions ✓ Healthy polyunsaturated fatty acid profile ✓ Increased linolenic and linolenic acid ✓ Healthier amino acid profile (lysine/arginine ratio-0.83) ✓ Increased dietary fibre ✓ Darkening in colour with increasing concentration ✓ Enhanced odour and flavour ✓ Better acceptability at 1% ✓ Increased cooking yield ✓ Increased TPC ✓ Decreased TBARS value ✓ Improved eating quality and health benefits ✓ Increased TDF, TPC and DPPH radical scavenging activity ✓ Improved water-binding properties ✓ Improved textural properties ✓ Increased dietary fibre ✓ Decreased shrinkage and shear force values ✓ Increased lightness (L) and yellowness (positive b* values) ✓ Improved emulsion stability and cooking yield ✓ Decreased lipid oxidation and improved odour scores ✓ Improved redness of nuggets ✓ Decreased hardness, gumminess and chewiness than control ✓ Improved water-binding properties ✓ High antioxidant activity ✓ Softer textural properties ✓ No adverse effect on sensory properties Properties Madane et al. (2020) Montalvo-González et al. (2018) Cox and Abu Ghannam (2013) Leang and Saw (2011) Fang et al. (2019) Siqueira et al. (2015) Cofrades, Benedí, Garcimartin, Sánchez-Muniz, and Jimenez-Colmenero (2017) Cofrades, López-López, Solas, Bravo, and JiménezColmenero (2008) Jiménez-Escrig et al. (2001) Jahanban-Esfahlan, Ostadrahimi, Tabibiazar, and Amarowicz (2019) Reference #On fresh weight basis; ABTS+- 2,2′-azino-bis-(3-ethyl-benzothiazoline-6-sulfonic acid); ADF-Antioxidant dietary fibre; AOC- Antioxidant capacity; DF- Dietary fibre; DPPH: 1,1-diphenyl-2-picrylhydrazyl; FRAP- Ferric reducing antioxidant power; IDF- Insoluble dietary fibre; EC50- Half maximal effective concentration; GAE- Gallic acid equivalent; LOI-Lipid oxidation inhibition; NEP- Non-extractable polyphenols; NSC- Non-structural carbohydrate; **PGE- Phloroglucinol equivalent; SDF- Soluble dietary fibre; *TAE–Tannic acid equivalent; TAC-Total antioxidant capacity; TDF-Total dietary fibre; TE-Trolox equivalent; TEP- Total extractable polyphenols; TPC- Total phenolics content. Application in muscle foods ADF and level used Table 2 (continued) A.K. Das, et al. Trends in Food Science & Technology 99 (2020) 323–336 Trends in Food Science & Technology 99 (2020) 323–336 A.K. Das, et al. powder (Verma et al., 2013), bael pulp residue (Das et al., 2015), lotus (Nelumbo nucifera) rhizome powder (Ham et al., 2017), pineapple pomace (Montalvo-González et al., 2018), drumstick (M. oleifera) flower (Madane et al., 2019) and dragon fruit peel (Madane et al., 2020). The use of ADF in meat products formulations not only extends their shelf life by delaying the lipid oxidation due to the presence of phenolic antioxidants, but also enhances the texture, physico-chemical and sensory attributes of meat products (Das et al., 2015; Madane et al., 2019; Sáyago-Ayerdi et al., 2009). A summary of ADFs derived from various plant materials and their effect on physico-chemical characteristics, oxidative stability and sensory attributes of meat product formulations is presented in Table 2. meat nuggets with guava power (0.5 and 1.0%) as ADF, Verma et al. (2013) found significantly higher moisture, total phenolics, DF and ash contents than control nuggets whereas the protein and fat contents were not affected. Likewise, chicken meat cutlets incorporated with different levels of dired carrot pomace powder (2.5, 5.0, 7.5 and 10%) resulted in a significant increase in moisture, ash and crude fibre with decreased fat contents (Kumar et al., 2015). An increase in protein and ash but a decrease in moisture and fat content was also observed with an increasing level of rye bran in low-fat meatballs (Yılmaz, 2005). In a study, Das et al. (2015) found no significant influence of bael pulp residue (0.25 and 0.5% levels) on the protein, fat and moisture (except ash) contents of goat meat nuggets. However, incorporation of bael pulp residue or guava powder significantly increased the amount of DF and total phenolics in goat meat nuggets in a dose dependent manner (Das et al., 2015). Recently, Madane et al. (2019) noticed significant improvement in protein, ash, total phenolics and DF contents of chicken nuggets, incorporating drumstick (M. oleifera) flower as ADF compared to control nuggets. 4. Technological development of meat products enriched with antioxidant dietary fibres 4.1. Physico-chemical properties of meat products The success of any emulsion-based meat product depends upon many factors including its physico-chemical properties such as pH, water holding capacity, emulsion stability, cooking yield etc. (Santhi, Kalaikannan, & Sureshkumar, 2017). pH is one of the extremely important quality parameters in emulsion-based meat products, as it influences the texture, cooking loss, tenderness of products and microbial activity (Lawrie & Ledward, 2006). Incorporation of ADF obtained from various sources such as cabbage powder (Malav et al., 2015), drumstick flower (Madane et al., 2019) and guava powder (Verma et al., 2013) has been reported to decrease the pH value in meat products in a dose dependent manner, which might be due to acidic nature of ADF. Likewise, emulsion stability has a great impact on the development of emulsion-based meat products and is linked with the stability, structure, better yield and sensory qualities (Santhi et al., 2017). Cooking yield is one of the most practical tests and used to predict the influence of non-meat ingredients on behaviour of meat products during processing. Reports available in this regard suggest that fibres or ADFs as non-meat components are known to influence emulsion stability, thereby increasing cooking yield. During meat processing, ADF binds to water and fat to give a very stable emulsion which remains so throughout the product processing and storage period resulting in improvement of cooking yield, water holding capacity and juiciness (Cofrades, Guerra, Carballo, Fernández-Martín, & Colmenero, 2000; Dhingra et al., 2012; Thebaudin, Lefebvre, Harrington, & Bourgeois, 1997). Hence, emulsion stability and cooking yield are highly related and lower cooking loss of emulsion-based meat products is advantageous not only from technological but also economical point of view. Studying the effect of two types of lemon albedo (raw and dehydrated) at different levels (2.5%, 5.0%, 7.5% and 10%) on meat emulsions, Sarıçoban et al. (2008) concluded that the highest functional properties were achieved in 5% albedo added emulsions. The Bael pulp residue as ADF at 0.5% level significantly enhanced the cooking yield and emulsion stability of goat meat nuggets (Das et al., 2015). Using drumstick (M. oleifera) flower as ADF in chicken nuggets, Madane, Das, Pateiro, et al. (2019a) found an improvement in the emulsion stability and a higher cooking yield (97.83% and 97.26%) than the control (96.79%). In contrast to the above findings, Verma et al. (2013) reported decreased emulsion stability and cooking yield as well with the inclusion of guava powder as ADF in sheep meat nuggets which could be due to low pH of meat emulsion interfering in the formation of uniform and stable emulsion. ADF can also influence the overall chemical composition of meat products, as it is reported to increase DF, moisture and carbohydrate while reducing the fat contents. Use of lotus (Nelumbo nucifera) rhizome as an ADF in cooked sausage slightly increased the moisture and ash but non-significantly decreased the protein content (Ham et al., 2017). It was also found that the fat content of cooked sausages decreased with increasing amount of lotus rhizome powder. While formulating goat 4.2. Lipid oxidation of meat products Major lipid components such as phospholipids, triacylglycerides and sterols are distributed in both intra and extracellular space of muscle (Domínguez et al., 2019). These lipid components are chemically unstable and, therefore, easily prone to oxidation, especially during postmortem handling, and storage of meat and meat products (Falowo, Fayemi, & Muchenje, 2014). This is the reason for high susceptibility of meat products to protein and lipid oxidation, bringing in deteriorative changes in products with the development of rancid odour and offflavour, drip loss, discolouration and accumulation of toxic compounds, negating its acceptability (Guyon, Meynier, & de Lamballerie, 2016; Zhang, Xiao, & Ahn, 2013). Strategic use of antioxidants from natural sources (extracts of fruits, vegetables, cereals, oilseeds, herbs, and other plant materials like leaves, bark and roots rich in phenolics) holds a more viable and promising option of enriching meat with health-promoting bioactive compounds (Barba et al., 2017; Falowo et al., 2018; Putnik et al., 2017; Žugčić et al., 2019) preventing oxidative rancidity (lipid and protein) of products (Falowo et al., 2014). These natural compounds also provide nutritional benefits and improve technological processing, and shelf life of meat and meat products (Singh, Singh, & Gandhi, 2018). Many reports are available using antioxidants associated with DF, derived from plant or plant by-products, in meat and meat products. In studies conducted by Verma et al. (2013) and Das et al. (2015), incorporation of guava powder and bael pulp residue as ADF significantly inhibited lipid oxidation in sheep meat nuggets during storage on contrary to control samples, which received lower flavour and odour scores due to higher lipid oxidation. Citrus fibre component delayed the lipid oxidation and decreased residual nitrite levels, when added to meat products (Fernandez-Gines, Fernandez-Lopez, Sayas-Barbera, Sendra, & Perez-Alvarez, 2003). Meat products with cabbage powder had significantly lower thiobarbituric acid reactive substances (TBARS) and free fatty acid values than control during storage under both aerobic as well as vacuum packaging conditions, which could be due to the presence of phenolic compounds in cabbage (Malav et al., 2015). Cooked sausages prepared with different levels of lotus rhizome powder had significantly higher oxidative stability to lipid oxidation (TBARS value 0.57–0.59 mg malondialdehyde (MDA)/kg) than control (0.88 mg MDA/kg) sample (Ham et al., 2017). This could be due to strong antioxidant effect of lotus rhizome because of its lipophilic fraction and presence of good amount of gallic acid which might have helped in preventing the initial and later stages of lipid oxidation in sausages (Deng et al., 2013). Using the extracts of M. oleifera flower as ADF, Madane et al. (2019) reported lower TBARS values in chicken nuggets during 20 days storage study period indicating that the polyphenolic compounds with strong antioxidant 330 Trends in Food Science & Technology 99 (2020) 323–336 A.K. Das, et al. capacity present in flower could be the contributing factor for more oxidative stability of ADF treated nuggets compared to control sample. and redness (a*) values in bolognas prepared with lemon albedo in comparison with control. The authors also reported that colour properties were influenced by types and concentration of albedo used in the formulations. Significant improvement in redness values was reported in goat meat nuggets with addition of ADF from bael pulp residue, but its yellowness value remained unaffected (Das et al., 2015) making the nuggets more appealing in attracting consumers. As far as the colour stabilizing effects of ADF during storage of meat products is concerned, Madane, Das, Pateiro, et al. (2019a) reported a reduction (up to 12.85%) in the redness (a*) values in cooked chicken nuggets enriched with drumstick flower as ADF on 0 day than control samples. However, the a* values were stabilized in ADF treated on contrary to control nuggets which faded rapidly after 10 days of storage. The presence of phenolics associated with DF could be the reason for stability in redness values of treated samples during storage. 4.3. Textural properties of meat products The texture is yet another important characteristic that not only influences the technological aspects of meat products but also plays a vital role in consumer satisfaction. The textural property of meat product is as a result of the interaction of meat proteins, particularly their gel-forming and emulsification characteristics, and the presence of functional non-meat ingredients like DF (Coggins, 2007). Research findings indicate that enriching DF influences the hardness, springiness and shear force of meat products, thereby modifying the texture to a great extent. Reports available in this aspect incorporating ADF from various sources such as guava powder in sheep meat nuggets (Verma et al., 2013), drumstick flower in chicken meat nuggets (Madane et al., 2019) and bael pulp residue in goat meat nuggets (Das et al., 2015) indicate that meat products had lower hardness, springiness, gumminess and shear force values than the control. But in other studies, nonsignificantly higher hardness (Malav et al., 2015) and springiness values (Wan Rosli, Solihah, Aishah, Nik Fakurudin, & Mohsin, 2011) were also reported with addition of cabbage powder in mutton patties, and in oyster mushroom-based chicken patties, respectively. A similar trend has also been observed by researchers in emulsion-based meat products with addition of DF from various sources. Ham et al. (2017) found that most of the textural parameters such as gumminess, hardness and cohesiveness of cooked sausages were unchanged when lotus rhizome powder was used as ADF. Bolognas sausages formulated with orange peel fibre as ADF were harder, less elastic, cohesive and chewy (Fernandez-Lopez et al., 2004). Depending upon the amount and type of fibre used, both hardening as well as softening effects were observed in various meat products which might be due to the nature of added DF ingredients and extent of their distribution in the meat batter mix, thereby influencing the meat product texture (Das et al., 2015). 4.5. Sensory attributes of meat products Sensory characteristics are often used to evaluate the quality and acceptability of products and have a great impact on consumers’ preference and willingness to purchase. In fact, the sensory properties of meat and meat products depend on various subsets of properties such as colour, flavour, appearance, texture and juiciness. ADF derived from various natural sources is reported to influence the sensory properties, particularly juiciness and texture of meat products. Addition of lotus rhizome powder as ADF had no adverse impact on the flavour, hardness, juiciness, or overall acceptability of cooked sausage (Ham et al., 2017), but an increase in ADF level decreased the juiciness score of the product. The inclusion of ADFs such as guava powder in sheep meat nuggets (Verma et al., 2013) and cabbage powder in mutton patties formulation (Malav et al., 2015) did not significantly affect the organoleptic properties such as texture, flavour, binding, juiciness and overall acceptability scores. However, meat products with cabbage powder received higher flavour scores than control during storage which might be due to its higher oxidative stability. Incorporation of bael pulp residue as ADF at 0.25% and 0.5% levels did not have any significant influence on various sensory properties in goat meat nuggets, except appearance, the score of which increased with ADF level (Das et al., 2015). In another study, chicken hamburgers prepared with GADF (0.5%, 1.0%, 1.5% and 2.0%) resulted in higher sensory values than control (Sáyago-Ayerdi et al., 2009). The DF along with phenolics content of GADF might have improved the flavour and tenderness of treated hamburgers. Chicken nuggets with drumstick flower as ADF had better appearance, flavour and juiciness scores than control sample during 20 days storage period. This could be due to the role of ADF acting as a stabilizing agent thereby preventing colour fading, improving the flavour by inhibiting lipid oxidation and increasing the moisture retention capacity of the product during cooking (Madane et al., 2019). 4.4. Colour of meat products It is well known that meat quality is best judged based on three sensory properties i.e. appearance, flavour and texture. Among these, appearance or appealing colour is one of the most important attributes that consumer's notice before drawing any conclusion whether to accept or reject the meat products (Chauhan, Pradhan, Nanda, Bandyopadhyay, & Das, 2018; Fanatico et al., 2008; Hu et al., 2016). Variations in colour other than the expected norm may be due to the physical characteristics of the meat, concentration and chemical state of pigments therein, and presence of non-meat ingredients (Hunt & Kropf, 1987). Different researchers have studied the effect of addition of nonmeat ingredients on colour stability in meat formulations. SáyagoAyerdi et al. (2009) found a significant reduction in the lightness (L*) and yellowness (b*) values in both raw and cooked chicken hamburgers with grape antioxidant dietary fibre (GADF) compared to control. The authors reported that the significant increase (2.22 times) in redness values may be due to red colour of phenolics present in GADF that could have stabilized the colour after 3 and 5 days of storage relative to control samples. Use of cabbage powder as ADF in mutton patties resulted in decreasing trend in the redness (a* value) and yellowness (b* value) as storage time progressed, but the values were far better than the control samples, where it faded more rapidly (Malav et al., 2015). Similarly, Verma et al. (2013) reported a significant improvement in the redness values (up to 38%) with addition of guava powder ADF in cooked sheep meat nuggets but found no effect on the lightness and yellowness values in comparison to control. The authors concluded that the enhancement in redness value could possibly be due to the red colour of guava powder. In another study, Fernandez-Gines, Fernandez-Lopez, SayasBarbera, Sendra, and Perez-Alvarez (2004) noticed higher lightness (L*) 4.6. Nutritional quality of antioxidant dietary fibres ADF also enhances the nutritional quality by enriching products with DF, micronutrients and desirable fatty acids. In fact, many fruits and vegetables fibres have been attributed to their constituents, including vitamin C and E, carotenoid, glutathione, flavonoids etc. (Eberhardt, Lee, & Liu, 2000). For example, raw carrot (Daucus carota) provides the richest source of β-carotene, iron, pectin, complex carbohydrate, and various minerals. So apart from being a potent antioxidant, β-carotene is reported to have anti-mutagenic, anti-tumoral and antiulcer effect on human health (López-Romero et al., 2018). Likewise, iron is very digestible and favours the formation of the red globules (Lester & Eischen, 1996). Guava powder contains up to 5–6% crude protein and 43% DF (Verma et al., 2013). Similarly, cabbage powder is rich in minerals (7.71%) and contains 36.70% DF (Malav et al., 2015). Drumstick flower, besides having DF and phenolics 331 Trends in Food Science & Technology 99 (2020) 323–336 A.K. Das, et al. Fig. 2. Schematic diagram depicting action and pathways of dietary fibre and polyphenolic compounds in gastrointestinal tract. Table 3 Summary of health effects promoted by consumption of diets enriched with different types of antioxidant dietary fibres. Animal and treatment length Diet characteristics Male Wistar rats (215 g) (n = 10 per group) 4 weeks Diets-isocaloric having identical fibre content (50 g/kg diet) but varying in the type of fibrecellulose or grape antioxidant dietary fibre (GADF) Male Sprague Dawley rats (338g vs331g) (n = 33 per group) 24 h Standard diet (AIN-93M modified diet) containing 26% of wheat bran, corresponding to 4.04 mg/kg body weight of ferulic acid (FA). Male ApcMin/+ mice (aged 5 weeks) (n = 12 and 10), 6 weeks Standard diet with GADF at 1% w/w. Male Wistar rats (215g) (n = 20) 4 weeks Standard diet with GADF at 1% w/w. Male Sprague-Dawley rats (40–60 g) (n = 90) 4 weeks Standard diet with wheat or oat bran (6g/100 g) Important findings ✓ Stimulates proliferation of Lactobacillus and slightly affects the composition of Bifidobacterium species ✓ Exerts positive effect on Lactobacillus reuteri and Lactobacillus acidophilus in vitro ✓ Enhances gastrointestinal health of rats through microbiota modulation ✓ Plasma FA from wheat bran remained constant up to 24hr after meal but completely disappeared 4hr after free FA ingestion ✓ Better antioxidant activity of plasma after consumption of bran than pure FA ✓ Supplementation with wheat bran seems more efficient than a supplementation with pure FA ✓ Prevents spontaneous intestinal polyposis in the ApcMin/+ mouse model ✓ Modulates cancer progression-related genes and downregulation of genes related to the immune response and inflammation ✓ Acts as a promising nutraceutical for the prevention of colon cancer in high-risk populations ✓ Potent inhibitor of mitochondria-associated apoptosis events ✓ Reduces the oxidative environment of the colonic mucosa through modulation of both the antioxidant enzyme and the glutathion: oxidised glutathion redox systems ✓ Acts on the expression of the pro- and anti- apoptotic Bcl-2 proteins, attenuating the mitochondrial apoptotic pathway in the distal colonic mucosa ✓ Oat bran diets not protective of tumor development. ✓ An acidic luminal pH and large luminal butyrate concentrations in the distal colon in the rats consuming wheat bran diet reduces tumor incidence in a rat model of colon cancer independent of effects on distal luminal butyrate concentrations 332 References Pozuelo et al. (2012) Rondini et al. (2004) Sánchez-Tena et al. (2013) López-Oliva, Pozuelo, Rotger, Muñoz-Martínez, and Goni (2013) Zoran, Turner, Taddeo, Chapkin, and Lupton (1997) Trends in Food Science & Technology 99 (2020) 323–336 A.K. Das, et al. content, is a good source of protein (17.87%) and ash along with an adequate profile of amino acids (Madane et al., 2019; SánchezMachado, Núñez-Gastélum, Reyes-Moreno, Ramírez-Wong, & LópezCervantes, 2010). Other than having DFs and antioxidants, sweet potatoes are rich in various types of vitamins (B1, B2, C, and E), minerals (calcium, magnesium, potassium and zinc), protein and non-fibrous carbohydrates (Suda, 1997) and its inclusion in meat products is reported to enrich the nutritional quality of buffalo meat products (Devatkal, Mendiratta, & Kondaiah, 2004). non-vegetarians all over the globe. In spite of this, it often draws flak for not being a ‘total diet’ by the nutritionists. To meet the challenges and changing demands of providing nutritious product offering health benefits and at the same time ensuring an appealing taste, texture and appearance, the meat processing industry is constantly in search of all possible ways to add functional properties to meat products. A wide variety of plant-derived materials (co-products and by-products), rich in fibre and polyphenolic compounds, and fulfilling the criteria of ADF, are widely used as ingredients in developing nutritionally designed foods. Enhancing the nutritive and functional properties of processed meat products through inclusion of ADF, derived from these plant materials, seems to be a way out and of interest to both meat processors and consumers as well. ADFs offer several advantages such as improved emulsion stability, texture, cooking yield, water holding capacity and sensory properties, when incorporated in meat product formulations. They also inhibit lipid peroxidation and microbial growth thereby extending the shelf life of meat and meat products. However, the inclusion of functional ingredients as ADF in meat product formulations should be based on their physico-chemical, antioxidant, antibacterial, technological properties, nutritional quality and cost effectiveness. Hence, future research plans should focus on employing novel methodologies (extraction, purification, and quantification methods) to get better yield and high-quality ADF. Furthermore, the interactions of ADF with meat products constituents, their bioavailability during processing and storage along with safety aspects need to be studied in pilot scale, but in a detailed way before potential commercial application in meat industry. In conclusion, the development of ADF enriched functional products opens up new possibilities for the meat industry to improve its ‘‘image” and opportunity to address consumer demands. 4.7. Assessment of health properties of food products enriched with antioxidant dietary fibre Intake of DF significantly influences the bioavailability of nutrients, microbial composition, and gastrointestinal functions and hence modulates the mechanism of nutrient absorption in both human and animal diet (Adams, Sello, Qin, Che, & Han, 2018). Further, DF along with phenolic compounds are two distinct food components having specific functional properties and offer protection against development of diabetes, inflammatory bowel diseases, gastrointestinal disorders, obesity, including constipation, coronary diseases and colon cancer (Jones et al., 2000). However, most of these functional bioactive compounds cannot be absorbed in native form. So, intake of ADF enriched food products does not assure their bioavailability in the gastrointestinal tract as such; hence uncertain of their biological fate (Parada & Aguilera, 2007). The bioavailability of the ingested nutrients depends upon the chemical and physical interactions between phenolics and indigestible dietary fibre and bioaccessibility of components in the digestive tract (QuirósSauceda et al., 2014). Reports available in this regard suggest a positive correlation exiting between DF associated with phenolic compounds and intestinal health, which could be due to scavenging of free radicals and counteracting the effects of DF pro-oxidants (Saura-Calixto, 2011) thereby creating a healthy antioxidant environment in the lumen (Pérez-Jiménez et al., 2009). This is possible when the partially fermented DFs and phenolic compounds (both non-absorbable and nonfermentable) reaches the large intestine and remain in the colonic lumen (Metzler & Mosenthin, 2008). Further, different short-chain fatty acids (SCFA), which are released due to partial or complete fermentation of DF components, may synergistically act in conjunction with antioxidant phenolics and modulate the expression of genes associated with some diseases (Tang, Chen, Jiang, & Nie, 2011). In a study on regulation of gene in mice upon consumption of GADF, Lizarraga et al. (2011) found that out of 26,393 genes, 641 genes were down regulated and 363 genes unregulated. The researchers opined that consumption of GADF might have played vital role on the beneficial health effects by down regulating nuclear receptor signalling, lipid biosynthesis (TNF and PPARα) and energy metabolism, and pathways associated with obesity. Their data also indicate that GADF protects healthy colon tissue against tumor development and reduces the risk of cancer. A schematic diagram depicting the action and pathways of DF associated with polyphenolic compounds in gastrointestinal tract is presented Fig. 2. It is the synergistic effect of phytochemicals, increased bioavailability of nutrient content, gastrointestinal functions and modulation of nutrient absorption mechanism, that are believed to be the mechanism behind ADF's beneficial effects on the treatment and prevention of obesity and diabetes (Weickert & Pfeiffer, 2008), reduced cardio-vascular diseases (Donovan, Manach, Faulks, & Kroon, 2006) and decreased incidence of certain types of cancer (Terry et al., 2001). The beneficial health effects of diets enriched with different types of ADF is summarized in Table 3. Acknowledgements This compilation is a review article written and analysed by the authors and hence required no substantial funding to be stated. Jose M. Lorenzo is member of the Healthy Meat network, funded by CYTED (ref. 119RT0568). References Adams, S., Sello, C., Qin, G.-X., et al. (2018). Does dietary fiber affect the levels of nutritional components after feed formulation? Fibers, 6, 29. 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