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Proceedings of the National Academy of Sciences of Belarus. Agrarian Series

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Amino-acid composition and balance of collagen containing raw materials

https://doi.org/10.29235/1817-7204-2018-56-4-492-503

Abstract

A prospective source of additional food protein in the meat industry is collagen-containing raw materials: pork skin, connective tissue obtained at meat trimming, collagen-containing by-products, etc., which can be used as part of proteinand-fat emulsions. Collagen emulsions have a wide range of functional properties: moisture and fat retention, foam and gelling abilities, emulsifying activity, active foam, emulsions and dispersions stabilizers, so they can be used as a technological additive in the meat industry. Therefore, the most important task in the process is the complete use of collagen-containing raw materials with the maximum implementation of its properties. The paper presents the results of studies on determining the amino acid composition and balance of collagen-containing raw materials: pork skin, beef tendons, lungs, rumen, beef lips and ears, pork ears, udder, spleen, omasum, skin, head, feet, caruncle, stomach and intestines of poultry. It was determined that collagen-containing raw material contains all the essential amino acids: isoleucine, leucine, lysine, methionine and cysteine, phenylalanine and tyrosine, threonine, valine with the amino acid count in the range of 17.1–185.0 %. At the same time, a more balanced amino acid composition in comparison with other types of collagen-containing raw materials is shown by: pork skin, udder, beef lips and trachea, chitterlings, omasum, rumen, lungs and spleen as evidenced by high values of amino acid score (up to 185 %), essential amino acid index (up to 1.1), utility factor of the amino acid composition (up to 0.84), as well as the approximate values of the comparable redundancy index (0.0007–0.0043). The research results confirm the prospectiveness of combining muscle and connective tissue proteins in recipes of meat products of high nutritional and biological value.
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ISSN 1817-7204 (Print)
ISSN 1817-7239 (Online)