文献类型：期刊文献

英文题名：Camellia Saponin-Enhanced Sodium Alginate Hydrogels for Sustainable Fruit Preservation

作者：Hu, Lisong[1] Rao, Hongdan[1,2] Zhu, Borong[3] Du, Menghao[1] Xu, Keqin[3] Gao, Haili[4]

第一作者：胡立松

通信作者：Du, MH[1];Gao, HL[2]

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, Daqiao Rd 73, Hangzhou 311400, Peoples R China;[2]Cent South Univ Forestry & Technol, Coll Food Sci & Engn, Shaoshan South Rd 498, Changsha 410004, Peoples R China;[3]Jiangxi Xinzhongye Tea Ind Technol Co Ltd, Yanshan 334500, Peoples R China;[4]Zhejiang Publ Welf Forest & State Forest Farm Mana, Jianggan Dist Kaixuan Rd 228, Hangzhou 311000, Peoples R China

年份：2025

卷号：11

期号：12

外文期刊名：GELS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001646595500001)】；

基金：This research was funded by "Pioneer" and "Leading Goose" R & D Program of Zhejiang, (2023C02042), Department of Science and Technology of Zhejiang Province, China.

语种：英文

外文关键词：camellia saponin; hydrogel films; fruit preservation; sodium alginate; sustainable packaging; barrier properties

摘要：It is well known that food waste, especially perishable fruits, is one of the pressing issues worldwide, and as much as 50% of harvested fruits are wasted in developing countries as a result of poor preservation methods. Other traditional options such as plastic films or chemical preservatives are harmful to the environment and to our health. In this work, the limitations are overcome through the fabrication of an innovative camellia saponin/sodium alginate (CS/SA) composite hydrogel film that not only recycles agricultural waste but also improves fruit protection. CS/SA films were prepared by ionic crosslinking with CaCl2 with different CS content (0-10% w/v, corresponding to 0-3.1 wt% in air-dried films). Detailed SEM, FTIR, XRD and rheological studies indicated that CS addition led to a gradual microstructural densification, stronger intermolecular interactions (involving hydrogen bonding and electrostatic complexation) and superior viscoelasticity, with the best performance at 8% CS (2.5 wt% in dried film). Mechanical tests confirmed that the stable CS/SA film showed higher tensile strength (152 kPa) and compressive strength (353 kPa) than pure SA (10 kPa) with a relatively low Young's modulus (0.82 MPa) and high elongation at break (116.33%), which could be easily peeled off from fruit surfaces-an essential benefit of this over stiff chitosan/alginate composites. Structure: The composite film exhibited lower porosity (103.2%), reduced moisture content (94.7%), a controlled swelling ratio (800%) and improved barrier property with a water vapor permeability of 1.3 x 10-6 gm-1s-1kPa-1 and an oxygen permeability of 1.9 x cm3mu mm-2d-1kPa-1. The 8% CS film showed very strong antioxidant activity (86% DPPH scavenging). Results of application tests on bananas and strawberries indicated that the ripening process was delayed by the CS/SA coatings, the decay rate was decreased from 99.9% (uncoated control) to 55.6% after 9 days, the weight loss was reduced to 29.3%, and the fruit's firmness and titratable acidity were maintained. This degradable, multifunctional hydrogel film has the potential to be a sustainable measure to simultaneously mitigate food waste, valorize agricultural byproducts, and protect the environment, which could offer substantial benefit for enhancing global food security as well as fruit shelf life.