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Asymmetric Janus composite films with superior humidity regulation capabilities for the efficient preservation of
Hao Dong1, Shuang Han2, Keqin Mi1
1College of Food Science and Engineering, Shandong Agricultural University, Taian, 271018, Shandong, PR China.
Abstract:
This study aims to report the limitations of single-layer film packaging to control relative humidity and preventing water vapor condensation within packaging systems. It introduces the development of an asymmetrically structured Janus humidity-regulated composite film. The composite film consists of an inner active layer made of polyvinyl alcohol/chitosan (PVA/CS) with a fibrous structure, and an outer barrier layer composed of PVAx% humic acid (HA) with a dense configuration. The PVA/CS inner active layer exhibits excellent water uptake properties (0.36 g/g) and rapid adsorption-desorption kinetics, reaching equilibrium in 17 min. The PVAx%HA outer barrier exhibits favorable water vapor barrier characteristics, with a water vapor permeability of (0.64 ± 0.01) × 10-11 g·m/(m2·s·Pa). In strawberry preservation, the PVA/CS-PVA1.5%HA composite film boosted storage relative humidity by 135.24 % and kept strawberries fresh for 7 days. This humidity-regulating film packaging offers a promising approach to extending the shelf life of fruits with high moisture content.
