食品科学2021，Vol.42Issue(21)：72-79,8.DOI:10.7506/spkx1002-6630-20201012-088
冻融处理对淀粉膜结构、热稳定性、机械性能及物理性质的影响
Effect of Freeze-Thaw Treatment on Structural,Thermal,Mechanical and Physical Properties of Starch-Based Films
摘要
Abstract
A series of edible films were obtained using native potato starch (PS) or modified potato starches,including hydroxypropyl distarch phosphate (HDP),acetate starch (AS) and oxidized starch (OS) by the casting method.The effects of freeze-thaw (F-T) treatment on the physical,mechanical and barrier properties,microstructure and thermal stability of the films were studied.X-ray diffraction (XRD) indicated that potato starch granules displayed a typical B-type crystalline structure,the crystallinity was damaged during the film-forming process,and the peak intensity was decreased obviously after F-T treatment.F-T treatment damaged the microstructure of starch-based films as observed by scanning electron microscopy (SEM),and there appeared obvious cracks on PS film,and honeycomb-like and lamellar structures on AS film,while OS and HDP films maintained a more complete morphology.In the thermogravimetric curves of starch-based films,four stages of mass loss appeared as temperature increased,corresponding to water loss,volatilization of glycerol,and depolymerization and decomposition of starch,respectively.Nevertheless,F-T treatment had little effects on the thermostability.At room temperature,PS film had the best mechanical property with tensile strength (TS) of 2.29 MPa and elongation at break (EB) of 68.82％.After three F-T cycles,film TS increased at least twice and EB generally declined,while solubility and WVP changed only a little.HDP film displayed much better F-T stability considering the microstructure,mechanical property,water vapor permeability and water solubility collectively,indicating its potential applications in frozen low-moisture foods.关键词
可食性淀粉膜/冻融稳定性/改性淀粉/物理性质/结构表征Key words
starch-based edible film/freeze-thaw stability/modified starch/physical property/structural characterization分类
轻工纺织引用本文复制引用
高珊,于力,邓云,王丹凤,钟宇..冻融处理对淀粉膜结构、热稳定性、机械性能及物理性质的影响[J].食品科学,2021,42(21):72-79,8.基金项目
国家自然科学基金面上项目(32072270) （32072270）
"十三五"国家重点研发计划项目(2018YFD0401305) （2018YFD0401305）
上海市科学技术委员会项目(19DZ2284200) （19DZ2284200）
