The protein that composes gelatin contains 18 kinds of amino acids, 7 of which are necessary for the human body. Except for water and inorganic salts below 16%, the protein content of gelatin accounts for more than 82%, which is an ideal protein source. The finished product of gelatin is colorless or light yellow transparent flakes or particles. Gelatin is insoluble in cold water, but can slowly swell and soften by absorbing water. bovine gelatin can absorb 5-10 times its weight in water. According to different sources, the physical properties of gelatin are also quite different. Among them, pigskin gelatin has better properties, high transparency and strong plasticity.
Gelatin is soluble in hot water to form a thermoreversible gel. It has extremely good physical properties, such as jelly power, affinity, high dispersibility, low viscosity, dispersion stability, and water retention. Coverage, toughness and reversibility, etc., so gelatin is an important food additive, such as a jelly and stabilizer for food. Thickener, foaming agent. Emulsifiers, dispersants, clarifiers, etc., are widely used.