Improving Antioxidant Properties of Chitosan Films by Incorporating Extracted Fractions of Propolis  

作　　者：Clara Pastor Chelo González-Martínez Maite Cháfer Amparo Chiralt 

机构地区：[1]Instituto Universitario de Ingeniería de Alimentos(FoodUPV),Universitat Politècnica de València,Camino de Vera s/n,Valencia,46022,España

出　　处：《Journal of Renewable Materials》2024年第12期1949-1962,共14页可再生材料杂志（英文）

基　　金：supported by Generalitat Valenciana(Valencia,Spain)(Grant No.CIPROM/2021/071).

摘　　要：Chitosan films with propolis aqueous extract were obtained in order to improve the antioxidant capacity of the materials.Likewise,oleic acid(OA)was also incorporated to enhance the film hydrophobicity,with and without previous infusion with propolis,to extract other potentially active compounds.The propolis extracts and the chitosan film-forming dispersions were characterised as to their particle size distribution,zeta potential and rheological behaviour.Chitosan-based films with aqueous extract and with oleic acid,containing or not propolis compounds,were obtained and characterised as to their microstructure,mechanical,barrier and optical properties and antioxidant capacity in order to evaluate their ability to extend the food shelf life.The propolis compounds from the aqueous extract notably modified the chitosan conformation and charge density of chitosan molecules,giving rise to more folded chains with a milder viscous effect.These changes in the polymer gave rise to a coarser film microstructure,which exhibited greater stiffness,and less stretchability and resistance to break,but a greater barrier capacity to water vapour and oxygen.These films had a ten-fold greater antioxidant capacity,thus having great potential to preserve food from oxidative spoilage.The incorporation of OA,containing or not propolis compounds,into these films reduced the film stiffness and resistance to break,and led to a highly enhanced oxygen permeability without there being any notable changes in either the water vapour barrier capacity or antioxidant power.

关 键 词：Antioxidant capacity aqueous propolis extract oleic acid CHITOSAN 

分 类 号：TB43[一般工业技术]