摘要
Flower-like KGZn superstructures formed by sequential coordination assembly. • KGZn enhances barrier, mechanical, and UV-blocking properties of KC films. • KC-KGZn films show DPPH (43.40%) and ABTS (97.67%) scavenging activities. • KC-KGZn films exhibit > 92% antibacterial ratios against E. coli , S. aureus , and S. cerevisiae . • KC-KGZn films extend blueberry shelf life to 15 days at 25 °C. The challenge of spoilage and waste in fruits is creating a strong demand for the development of green and efficient active packaging materials. This work presents a flower-like kaempferol–gallic acid–Zn coordination superstructure (KGZn) synthesized via coordination-driven assembly. KGZn was incorporated into a film matrix composed of konjac glucomannan and carboxymethyl chitosan (KGM/CMCS, denoted as KC), yielding the KC-KGZn composite film. Serving as a multifunctional agent, KGZn significantly improves the physicochemical properties of the composite film, enhancing its barrier performance and mechanical properties. Furthermore, the composite film exhibits excellent antioxidant activity, with DPPH and ABTS scavenging rates reaching 43.40 ± 2.10% and 97.67 ± 0.67%, respectively, as well as potent antimicrobial activity, showing inhibition ratios of 92.15%, 100%, and 98.66% against Escherichia coli , Staphylococcus aureus , and Saccharomyces cerevisiae , respectively. In blueberry preservation tests, the KC-KGZn composite film effectively slowed down fruit weight loss and firmness degradation, maintained soluble solids content, and preserved desirable sensory quality after 15 days of storage at 25 °C. These results indicate that the introduction of this flower-like superstructure material is an effective strategy for fabricating high-performance food packaging films, while also promoting the development of metal-polyphenol functional fillers. Download: Download high-res image (173KB) Download: Download full-size image
危险品化学品经营许可证（带存储）