Solid leather waste was treated through enzymatic hydrolysis into two products: water-soluble collagen hydrolysate of low molecular mass(approx.

Collagen, gelatin and collagen hydrolysate were prepared from bovine skins in different preparative processes.

Study of the Separation of Collagen Hydrolysate;

87%, and the physical and chemical properties of collagen hydrolysate were also studied.

Preparation and capability tests for hydrolyzed collagen/sodium alginate/nano-siox complex film;

The dosages of hydrolyzed collagen,catalyzer,triethanolamine and reaction time,temperature were studied for the fatliquor manufactured from epoxidized rape oil and the hydrolyzed collagen.

The effect of dechroming temperature, the offer of phosphoric acid and the reaction time on the amount of dechroming and collagen hydrolysis were studied.

Using by the visible and ultraviolet spectrophotometric method and the method combining with the determination of solution pH value,the mechanism of lactic acid dechroming was discussed,by means of the measurement of temperature,the amount of lactic acid and time on the quantity of dechroming and collagen hydrolysis.

Detection of hydrolyzed animal collagen proteins in milk by colorimetry;