Improving the active food packaging function of poly(lactic acid) film coated by poly(vinyl alcohol) based on proanthocyanidin functionalized layered clay. (15th January 2023)

• Record Type: Journal Article
• Authors: Wang, Chengyu; Mao, Long; Yao, Jin; Zhu, Heping
• Is Part Of: Lebensmittel-Wissenschaft + Technologie =. Volume 174(2023)
• Publication Date: 2023-01-15
• Subjects: Active packaging -- Proanthocyanidin -- Layered clay -- Poly(vinyl alcohol) -- Poly(lactic acid); Food industry and trade -- Periodicals; Food -- Composition -- Periodicals; Microbiology -- Periodicals; Nutrition -- Periodicals; 664.005
• DOI: 10.1016/j.lwt.2022.114407
• Languages: English
• ISSNs: 0023-6438

Abstract

Abstract: In this paper, natural plant polyphenol-proanthocyanidin (PAC) and layered clay-layered double hydroxides (LDHs) were firstly introduced into poly(vinyl alcohol) (PVA) based coatings to construct PAC/PVA and PAC functionalized LDHs (LDHs@PAC-Cu)/PVA dual active coatings, and further successively coated on the surface of PLA base films to develop PLA active films. The results showed that PAC and copper ions were successfully loading on the LDHs surface through adsorption and complexation. After a certain amount (≥3 wt %) of LDHs@PAC-Cu was added, active packaging functions and gas barrier properties of PLA active films were improved markedly. When 5 wt % LDHs@PAC-Cu was added, antioxidant and antibacterial properties of PLA active films reached 84.31% and 95.5%, oxygen and water vapor transmission rate decreased by 99.4% and 62.6% compared with PLA base film, and the shelf life of pasteurized milk was extended from 60 h to 96 h. Active substances release test indicated that LDHs@PAC-Cu could not only delay the release of active substances in the early stage, but also supplement the release of active substances in the later stage, thus extending the shelf life of food more effectively. Therefore, PLA active films have good application potential in the field of active food packaging. Highlights: The first synthetic LDHs@PAC-Cu combines bioactivity of PAC and barrier properties of LDHs. The active coatings were constructed on PLA base film by dual coating technology. LDHs@PAC-Cu could delay the release of PAC in the active coatings. PLA multilayer composite active films showed excellent active food packaging functions.