[Collagen fractions, obtained by water-salt extraction from animal fats].

Collagen fractions have been isolated by water-salt extraction from raw materials of animal origin (various tendon types or subcutaneous tissues of cattle, or porcine skin). Collagen fractions with maximum capacity for water and fat retention were isolated with high efficiency by water-salt solutions containing 1-10% sodium chloride at temperatures below 50 degrees C. The values of the effective constant of extraction rate (min-1) at pH 6.

[Reaction kinetics of hydrolysis of animal fat by pancreatic lipase].

Hydrolysis of lipids from beef fat by pancreatic lipase was studied. Maximal release of free fatty acids was shown to take place for the first 3 h of experiment. After this, transetherification developed.

[Kinetic characteristics of enzymatic hydrolysis of complex protein substrates for preparing culture media].

Hydrolysis of a protein mixture from muscle and bone tissues with the enzymatic system from procine pancreatic cell suspension was studied. Kinetic constants and the values of activation energy were determined for individual processes of the release of 15 amino acids. The kinetic characteristics of the overall enzymatic hydrolysis calculated from analysis of the changes in concentrations of terminal amino groups were compared with the characteristics obtained while studying the accumulation patterns of individual amino acids.

[Proteolytic activity of the enzyme complex of the mammalian pancreas in comparison with pancreatin].

The proteolytic activity and thermal stability of the enzyme complex of cell suspension from pig and bovine pancreas glands was compared with those of pancreatin. The enzyme complex displayed the highest thermal stability and activity at 50 degrees C. The kinetic constants, energies of activation and inactivation of the enzyme complex, and pH optimum (7.

[Preparation and purification of protein hydrolysates].

Recent achievements in the technology of production of protein hydrolysates are reviewed. Approaches to description of the mechanism of hydrolysis and the possibility of purification of hydrolysates for their use in the food, medical, forage, and microbiological industries are discussed.