Enhancement of water barrier and antimicrobial properties of chitosan/gelatin films by hydrophobic deep eutectic solvent

作者：Wen, Haitao; Tang, Daobang; Lin, Yaosheng; Zou, Jinhao; Liu, Zhongyi; Zhou, Pengfei; Wang, Xuping^*

来源：Carbohydrate Polymers, 2023, 303: 120435.

DOI：10.1016/j.carbpol.2022.120435

• Chitosan
• gelatin film
• Hydrophobic deep eutectic solvent
• Antimicrobial activity
• Thymol
• Food packaging

Biodegradable chitosan/gelatin (CS/GEL) films have attracted attention as food packaging, but the poor water sensitivity and functional limitations of these films should be addressed. In this study, the hydrophobic deep eutectic solvent (DES, 0-15 %) consisting of thymol and octanoic acid was used to improve the water resistance and antibacterial performance of the CS/GEL composite films. FTIR and SEM analyses revealed a strong inter-action between the CS/GEL matrix and DES. The films blended with DES showed increased water contact angle values and thermal stability. Furthermore, the addition of DES resulted in a significant increase in the elasticity and decrease water vapor transmission rate (WVTR). The CS/GEL films blended with 9% DES showed a 38.5% decrease in WVTR compared to those without DES. Additionally, the DES-containing film displayed good anti-bacterial activity against Staphylococcus aureus and Escherichia coli. Overall, the CS/GEL-DES composite films are expected to contribute an improvement to food packaging.

• 单位
  广东省农业科学院; 湘潭大学