文献类型：期刊文献

英文题名：Fabrication of Polygonatum cyrtonema Hua FlavonoidAgNPs and its PLA Composite Active Film for Extending the Shelf Life of Frozen Litchi

作者：Wang, Zhihong[1] Wang, Song[1] Chen, Yingle[1] Yang, Liu[1] Qi, Zhiwen[2] Zeng, Lei[1]

第一作者：Wang, Zhihong

通信作者：Zeng, L[1];Qi, ZW[2]

机构：[1]Guangdong Acad Forestry, Guangdong Prov Key Lab Silviculture Protect & Util, Guangzhou 510520, Guangdong, Peoples R China;[2]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Natl Engn Lab Biomass Chem Utilizat, Nanjing 210042, Jiangsu, Peoples R China

年份：2025

卷号：20

期号：3

起止页码：5279-5300

外文期刊名：BIORESOURCES

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001485164600011)】；

基金：This work was supported by the Guangdong Forestry Science and Technology Innovation Project (Grant No. 2021KJCX004) , and the National Key Research and Development Program of China (Grant No. 2022YFD2200604-3) .

语种：英文

外文关键词：Polygonatum cyrtonema Hua; Flavonoids; AgNPs; Antioxidant; Antimicrobial; Preservation

摘要：This study presents an eco-friendly strategy to valorize Polygonatum cryptonym Hua flavonoids (PC) from the residues of polysaccharide extraction by synthesizing silver nanoparticles (PC-AgNPs) with enhanced yielded monodisperse, spherical PC-AgNPs (avg. 16.2 nm) with facecentered cubic crystal structure. Nanoparticles showed remarkable scavenging ability for DPPH free radical (SCso = 2.61 mu g/mL) and ABTS free radical (SCso = 1.65 mu g/mL) compared to the native PC samples. The PC-AgNPs were incorporated into polylactic acid (PLA) films (1% w/w), elongation at break: 6.0%) while demonstrating broad-spectrum antimicrobial activity against E. coli, S. aureus, and A. niger. Mechanistic studies revealed that the nanocomposite film disrupted bacterial membrane integrity in E. coll. Applied to litchi preservation at -18 degrees C, the Ca2+-ATPase) at more than 80% of fresh fruit levels for a certain storage life, significantly delaying senescence compared to controls. These findings establish PC-AgNPs/PLA as a dual-functional active packaging material that synergistically combines antioxidant reinforcement, antimicrobial protection, and physiological regulation for postharvest fruit preservation.