Deep processing of collagen-rich poultry products for different use

The competitiveness of meat processing technologies requires deep processing of protein containing raw materials including low-value wastes and by-products of meat processing. The connective tissues after animal and poultry meat processing can reach 16 % of initial carcass weight and hence the reasonable utilization of these resources is reasonable. Low-value by-products can be transformed to protein products via hydrolysis resulting in the preparations of isolated collagen-rich high-purity proteins with key functional and technological properties for food, feed, medical, and cosmetic industries. Chicken skin (J. Stachowiac et al., 2004), necks and bones (M.I. Kremnevskaya et al., 2016; P.F. De Almeida et al., 2013), trachea of chickens, ducks and ostriches (T. Jaroenviriyapap et al., 2009) were studied as secondary collagen-rich raw materials. The most common techniques of collagen extraction are acidic and high-temperature hydrolysis (K.A. Munasinghe et al., 2014), papain and pepsin hydrolysis (P. Hashim et al., 2014), alkalase and trypsin hydrolysis (Z. Khiari et al., 2014) and microbial fermentation (A.Yu. Poletaev et al., 2011; O.V. Zinina et al., 2013). Deep processing of secondary collagen-rich raw materials in the meat industry will reduce the existing deficit of food and feed protein, expand the assortment and increase the output of meat products and low cost digestible feeds, and improve the ecological situation. For pharmacology, short peptides are of interest, the regulatory function of which has been known for a long time and is used in medicine (A.D. Neklyudov et al., 2007) which could be produced by deep processing of animal and poultry carcasses. The importance of dietary collagen is also associated with imino acids with -NH groups (proline, hydroxyproline) which are necessary for tissue growth and development (S. Busche, 2011). Different techniques of processing collagen-containing raw materials allow to manufact protein products with specified properties for use in food, feed and other industries.