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Eugenol embedded zein and poly(lactic acid) film as active food packaging: Formation, characterization, and
Xueying Huang1, Xiaohan Ge1, Liping Zhou1
1College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China; Ningbo Research Institute, Zhejiang University, Ningbo 315100, China.
Abstract:
Biodegradable packaging is more eco-friendly compared with the synthetic plastics. To improve the physical properties of the zein films, poly(lactic acid) (PLA) was mixed with zein to make a biodegradable blend film. The composition of the film with the best properties was the one with zein and PLA in the mass ratio of 1:1 with the addition of 20% poly(ethylene glycol) as the plasticizer. The incorporation of PLA significantly increased the elongation, reduced the tensile strength, and decreased the water vapor and gas permeabilities of zein films. The antimicrobial agent eugenol added in the film significantly inhibited the growth of both S. aureus and E. coli. The migration tests were conducted to confirm the safety of the blend films. This is the first-time report of zein-PLA blend film. The antimicrobial zein-PLA-eugenol film with enhanced mechanical and barrier properties has a high potential as active biodegradable food packaging.
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