Preparation of ε-Polylysine/Polyaspartic Hydrogel Loaded with Polyphenols and Its Performance Analysis.

ε-Polylysine/polyaspartic hydrogel loaded with different polyphenols was prepared by ion gelation method, and structure characterization and performance analysis of complex hydrogel was investigated. The embedding ratio of ε-polyly-sine/polyaspartic ammonia hydrogel for tannic acid, kaempferol, brown algae polyphenols and three mixed polyphenols were all above 80%. The hydrogel loaded with tannic acid has the largest particle size (2 160.33 nm), the thermal denat-uration temperature and enthalpy value of composite hydrogels without polyphenols was 137.16 °C and 63.67 J/g, respectively, the thermal denaturation temperature and enthalpy values of the composite hydrogels loaded with tannic acid increased to 138.45 °C and 86.53 J/g, respectively, while the thermal denaturing temperature of the hydrogels loaded with kaempferol and brown algae polyphenol decreased to 134.54 °C and 135.32 °C, respectively, and the enthalpy decreased to 53.75 J/g and 59.88 J/g, respectively. Indicating that the compound hydrogel was more suitable for embedding water-soluble tannic acid, and the embedding efficiency of the composite gel to kahanol and other hydrophobic polyphenols was enhanced by the addition of tannic acid. Therefore, polyphenols were coated in ε-polylysine/polyaspartic acid hydrogel with an amorphous structure, and the embedding effect of the these polyphenols was as follow: tannin > tannin / three mixed polyphenols of acid > brown algae polyphenols > kaempferol. [ABSTRACT FROM AUTHOR]