1. Characterization of Rice Protein Hydrolysate/Chitosan Composite Films and Their Bioactivities Evaluation When Incorporating Curcumin: Effect of Genipin Concentration.
- Author
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Xie, Hexiang, Zhang, Liqiong, Ouyang, Kefan, Wang, Yong, Xiong, Hua, and Zhao, Qiang
- Subjects
PROTEIN hydrolysates ,ESCHERICHIA coli ,CURCUMIN ,RICE ,WATER vapor ,TENSILE strength ,CHITOSAN - Abstract
The effect of genipin (GP) concentrations on the structural, mechanical, and water barrier properties of chitosan (CS)/rice protein hydrolysate (RH) composite films was investigated for further incorporating of curcumin. GP increased the stability of CS/RH conjugate in solution. The degree of CS/RH crosslinking depended on genipin concentration, as indicated in particle size and UV spectra. At optimal genipin concentration (0.4 mg GP/g total biopolymers), the CS/RH film had the lowest moisture content (10.67%) and water vapor transmission rate (829.35 g/m
2 ·24 h.). Genipin could enhance the tensile strength and thermal stability of the CS/RH films depending on GP addition concentration. With an increased amount of GP, the DPPH scavenging activity decreased due to the cross-linking of antioxidant peptides, and the E* value increased indicating the significant color differences caused by increasing GP. Notably, the addition of curcumin had a positive effect on the DPPH scavenging activity and antimicrobial activity of the CS/RH films. Curcumin-loaded CS/RH films had higher antibacterial activity against S. aureus than E. coli. In general, the suitable addition content of GP was a promising and green strategy to improve the properties of the CS/RH films. [ABSTRACT FROM AUTHOR]- Published
- 2023
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