食品科学2024，Vol.45Issue(24)：9-16,8.DOI:10.7506/spkx1002-6630-20240216-076
小麦粉中水分子成簇及其在水分扩散中的作用——基于等温吸附的观察
Water Clustering in Wheat Flour and Its Role in Water Diffusion:Observation Based on Sorption Isotherm
摘要
Abstract
This study was performed in order to investigate water clustering and its contribution to water diffusion in wheat flour.Based on the water adsorption and desorption isotherms of wheat flour at 20,30 and 40℃,the water clustering properties were explored using the Park isotherm model,the Zimm-Lundberg method and the Brown method.Consistently,the results of the three methods suggested that water clustering occurred at high water activity(aw)levels,while the critical aw for clustering obtained from the three methods were only slightly different,ranging from 0.70 to 0.75,from 0.73 to 0.79 and from 0.56 to 0.68,respectively,which varied with temperature and the water sorption process.The predicted mean cluster size at aw of 0.95 was approximately 3.5,4.5 and 6.5 from the three approaches,respectively.The number of water clusters kept almost unchanged at aw not lower than 0.90.Water diffusivity sharply decreased when aw was over 0.62-0.70.Furthermore,based on thermodynamic factor and self-diffusivity,it was found that water molecules were more likely to interact with themselves,leading to water clustering,which could be the major contributor to the sharp decrease of water diffusivity.When aw was equal to or more than 0.90,the strong self-diffusion capacity brought about by high water content could counteract the negative effect of water clustering,resulting in an almost constant water diffusivity.关键词
水分子成簇/水分扩散/热力学因子/相互作用/等温吸附/小麦粉Key words
water clustering/water diffusion/thermodynamic factor/interaction/isothermal sorption/wheat four分类
轻工纺织引用本文复制引用
赵学伟,魏笑笑,郭豫,王宏伟,张华..小麦粉中水分子成簇及其在水分扩散中的作用——基于等温吸附的观察[J].食品科学,2024,45(24):9-16,8.基金项目
国家自然科学基金区域联合基金重点项目(U22A20537) （U22A20537）
河南省重点研发专项(231111113200) （231111113200）
