The work aims to develop a novel active packaging film, offering both highly efficient preservation and environmental friendliness, to address the issues of chlorophyll degradation and wilting in pak choi (Brassica chinensis L.) during post-harvest storage, primarily due to vigorous respiration and transpiration. To achieve this, bio-based polylactic acid (PLA) and poly (butylene adipate-co-terephthalate) (PBAT) were employed as matrix materials, incorporating the plant growth regulator 6-benzylaminopurine (6-BA) combined with thermoplastic starch (TPS) as a filler. Functionalized PLA/PBAT/TPS composite films with varying 6-BA contents (0%, 1%, 3%, 5%) were prepared via melt blending and cast extrusion. The films were systematically characterized for their microstructure (FTIR, SEM), mechanical properties, water vapor permeability (WVP), oxygen permeability (OP), and water contact angle (WCA). Subsequently, these films were applied to pak choi preservation to evaluate their effects on appearance quality, sensory evaluation, weight loss rate, in-package atmosphere, and chlorophyll content. The results indicated that the incorporation of 6-BA significantly regulated the film properties. The film with 1% 6-BA exhibited the optimal overall mechanical performance and also demonstrated the lowest WVP (5.33×10-11 g·m/(m2·s·Pa)), indicating excellent moisture barrier capability. Microstructural analyses (FTIR and SEM) confirmed molecular-level interactions, specifically hydrogen bonding and π-π stacking, between 6-BA and the polymer matrix, with uniform dispersion at low concentrations, which in turn affected the macroscopic properties of the films. Preservation experiments showed that the 1% 6-BA@PLA/PBAT/TPS film exhibited the optimal preservation effect, effectively maintaining weight loss rate, significantly delaying yellowing and chlorophyll degradation, and extending the shelf life of pak choi by 200%. In conclusion, functionalized PLA/PBAT/TPS active films have been successfully developed, achieving synergistic optimization of film properties and preservation efficacy by adjusting the 6-BA content. The 1% 6-BA film exhibits the best overall performance, offering a promising solution for green and efficient post-harvest preservation technology for fruits and vegetables, with significant application potential in active packaging for agricultural products.
Key words
film /
Pak chois /
shelf life /
6-BA
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