Abstract
Collagen is obtained from natural leather production waste. Qualitative analysis and quantitative calculation of the concentration of the studied free amino acids were determined by comparing the retention time and peak areas of the standard and studied phenylthiocarbamate derivatives of amino acids. As a result of the research, 20 amino acids were identified in collagen, 10 of which are essential. The predominant amino acids in collagen are cysteine, glutamic acid, glycine and arginine. Therefore, the obtained data allowed to characterize collagen as a source of protoionogenic amino acids.
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