Abstract
A comparative study of soybean and rapeseed protein hydrolysis by protosubtilin, an original Russian enzyme preparation widely used in animal feed production, has been performed. SDS-PAG electrophoresis, HPLC, and mass spectrometry have been employed to analyze the obtained products. The soybean protein isolate used for hydrolysate production was obtained from a commercial supplier, and rapeseed proteins were prepared from the meal by alkali extraction. Low molecular weight impurities were removed by ultrafiltration. The degree of protein hydrolysis has been shown to depend on the substrate-to-enzyme preparation ratio, hydrolysis time, and protein concentration. Rapeseed protein hydrolysis by protosubtilin at an enzyme/protein ratio of 1: 20 and hydrolysis time of 20 h resulted in complete cleavage of the proteins present in the raw material and the accumulation of oligopeptides (molecular weight less than 14 kDa) and free amino acids, which accounted for 53 and 8% of the initial protein weight, respectively. In contrast to rapeseed proteins, soybean proteins showed considerable gelling at the initial stages of hydrolysis, and the formation of insoluble hydrolysis-resistant fragments was observed. The soluble part of the hydrolysate contained short oligopeptides and free amino acids, which accounted for 13% of the initial protein weight only.
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Original Russian Text © D.V. Zinchenko, T.A. Muranova, L.A. Melanyina, N.A. Belova, A.I. Miroshnikov, 2018, published in Prikladnaya Biokhimiya i Mikrobiologiya, 2018, Vol. 54, No. 3, pp. 277–285.
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Zinchenko, D.V., Muranova, T.A., Melanyina, L.A. et al. Soy and Rapeseed Protein Hydrolysis by the Enzyme Preparation Protosubtilin. Appl Biochem Microbiol 54, 294–300 (2018). https://doi.org/10.1134/S000368381803016X
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DOI: https://doi.org/10.1134/S000368381803016X