Collagen gelatin material from

Gelatin Derived from denatured collagen, its isoelectric point can be manipulated during formation to control charge. It has been modified for extended release of genetic material (61-63)... 

Biopolymers electrospun from natural materials usually fall into two categories proteins (e.g., collagen, gelatin and silk fibroin) and polysaccharides (e.g., cellulose and its derivatives, chitin/chitosan and hyaluronic acid). 

The denaturation phenomenon is the basis for a simple test for the identification of native soluble collagen in cosmetic raw materials from a homogeneous collagen solution, insoluble collagen fibrils can be obtained if sodium chloride is added to the solution to a final concentration of 5-7%. Fibrils from native collagen but not gelatinized or hydrolyzed collagen will be precipitated. 

The natural materials are often derived from skin such as, for example, collagen, gelatin, fibrin, hyaluronic acid, chondroitin sulfate and also acellular dermis from cadaveric skin origin. But materials from other origins are also widely used, such as bacterial polyesters (Valappil et al., 2007), cellulose (Teeri et al., 2007), chitosan, alginate, dextran, etc. A lot of constructs based on natural products can be found in different forms such as membrane, plate, sheet, fiber, sponge, and hydrogel. 

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