Study on the Characteristics of Gelatin-based Film Precursor So-lution Prepared Using a Deep Eutectic Solvent
Using gelatin as the raw material,a homogeneous solution was prepared by dissolving it in a ternary system of sodium acetate trihydrate/urea/water(DES/H2O).Compared to traditional water system,gelatin dissolved by DES/H2O can expose more active functional groups.Therefore,more ester bonds could be formed between gelatin and polyvinyl alcohol when using carbon diimide hydrochloride as a cross-linking agent.Results indicate that,when DES/H2O solvent contained 60％DES was used(based on the total mass of the DES/H2O solution),the prepared gelatin-based film precursor exhibited 95.23％of transmittance,1 524.0 nm of particle size,and-31 ℃ of crystallization temperature.At a shear rate of 10 s-1,its viscosity was 449.07 mPa·s.These findings suggest that the prepared gelatin-based precursor solution demonstrates strong cross-linking effect,good compatibility,and stable internal structure,providing a novel method for processing gelatin-based films with favorable physicochemical properties.
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