切片厚度对何首乌干燥过程的影响  

Effect of Slice Thickness on Drying Process of Polygonum multiflorum Root Tuber

作　　者：林冰[1,2,3] 周礼青[1] 齐美娜[1] 周英[1,2,3] 王慧娟[1,2,3] 

机构地区：[1]贵州大学生命科学学院,贵州贵阳550025 [2]贵州省中药民族药创制工程中心,贵州贵阳550025 [3]贵州省中药材繁育与种植工程实验室,贵州贵阳550025

出　　处：《中药材》2013年第8期1244-1249,共6页Journal of Chinese Medicinal Materials

基　　金：教育部新世纪优秀支持计划(教技函[2011]95号);贵州省优秀青年科技人才培养对象专项资金(黔科合人字[2011]34号);贵州省科技厅创新人才团队建设项目(黔科合人才团队[2010]4006号);贵州省高校工程技术研究中心建设项目(黔教合KY字[2012]018号);贵州大学大学生"SRT计划"项目(贵大SRT字[2012]68号)

摘　　要：目的:探讨不同切片厚度对何首乌干燥过程的影响。方法:将何首乌分别切成2、5、8 mm的块,分别置45、55、65、75℃恒温条件下进行干燥实验,对干燥曲线进行模型拟合,以RMSE、R2和χ2作为判断模型拟合优劣的标准;根据薄层干燥理论计算干燥过程的动力学参数。结果:当切片厚度较厚或干燥温度较高时,何首乌的干燥过程可分为第1降速和第2降速2个阶段,Aghbashlo模型能较好描述何首乌干燥过程;切片厚度对何首乌的干燥过程的有效水分扩散系数影响较大,但对活化能无影响。结论:应用薄层干燥理论可以较好地揭示何首乌干燥过程中水分的变化规律,从而为何首乌药材干燥过程的质量控制提供实验依据。Objective： To study the effect of slice thickness on drying process of Polygonum multiflorum root tuber. Methods：The root tuber of Polygonum multiflorum was sliced with thickness of 2, 5 and 8 mm. Drying experiments were conducted at temperatures of 45, 55, 65 and 75 ℃. The experimental data were fitted to ten thin-layer drying models to select a suitable model for describing the dr- ying characteristic of Polygonum multiflorum root tuber. Based on thin-layer drying theory, the kinetics parameters of drying process were calculated. Results ：The drying processes of Polygonum multiflorum root tuber were consisted of two regions, 1 st and 2nd falling rate periods when the slice thickness was thick or the drying temperature was high. Aghbashlo model was the best one to describe its dr- ying behavior. The variation of thickness had significant effect on effective moisture diffusivity （D）, but had little effect on activation energy Ea. Conclusion ： Thin-layer drying theory can be an effective tool for the study of drying behavior of Polygonum multiflorum root tuber. The result provides experimental basis for the quality control of Polygonum multiflorum root tuber drying process.

关 键 词：切片厚度 何首乌 干燥 数学模型 动力学 

分 类 号：R283.3[医药卫生—中药学]