Green synthesis of Poria cocos polysaccharides-silver nanoparticles and their applications in food packaging

Xiaoqian Yang; Yun Niu; Yingrun Fan; Tingting Zheng; Jiangping Fan

doi:10.1016/j.ijbiomac.2024.131928

Green synthesis of Poria cocos polysaccharides-silver nanoparticles and their applications in food packaging

Int J Biol Macromol. 2024 Apr 28;269(Pt 1):131928. doi: 10.1016/j.ijbiomac.2024.131928. Online ahead of print.

Authors

Xiaoqian Yang¹, Yun Niu¹, Yingrun Fan¹, Tingting Zheng¹, Jiangping Fan²

Affiliations

¹ College of Food Science and Technology, Yunnan Agricultural University, Kunming 650201, China.
² College of Food Science and Technology, Yunnan Agricultural University, Kunming 650201, China. Electronic address: 1993033@ynau.edu.cn.

PMID: 38688339
DOI: 10.1016/j.ijbiomac.2024.131928

Abstract

To reduce pollution caused by traditional plastic packaging and preparation of silver nanoparticles (AgNPs), this work aims to develop biological macromolecular packaging films with green synthesized AgNPs. In this study, a novel P. cocos polysaccharide (PCP) with a unique monosaccharide composition was extracted from Poria cocos (Schw.) Wolf. Then, this polysaccharide containing 24.68 % rhamnose was used as a stabilizer for the green synthesis of PCP-AgNPs for the first time. PCP-AgNPs exhibited excellent antibacterial activity against P. aeruginosa, E. coli, and S. aureus, with the highest antibacterial activity against E. coli (inhibition zone diameter = 11.14 ± 0.79 mm). Subsequently, PCP-AgNPs/chitosan (CS) film was successfully prepared by incorporating PCP-AgNPs into the CS film solution. Several experiments demonstrated that the addition of this nanomaterial promoted the formation of noncovalent interactions between CS and PCP-AgNPs, resulting in a more regular and denser film. Compared to the CS film and control group, the PCP-AgNPs/CS film significantly maintained the quality indexes of strawberries. Therefore, this composite film successfully extended the shelf life of strawberries. Regarding safety, these packaging films were not cytotoxic toward RAW264.7 cells. In conclusion, the environmentally friendly PCP-AgNPs/CS film has the potential to replace some traditional food packaging materials.

Keywords: Food packaging; Green synthesis; P. cocos polysaccharide; Shelf-life of strawberry; Silver nanoparticles.