[关键词]
[摘要]
目的 研究当归在低温阴干及低温回潮干燥条件下的干燥及回潮特性,明确低温及回潮对当归干燥过程的影响。方法 采用Weibull分布函数和1stOpt软件模拟当归在低温阴干和低温(40、55℃)回潮条件下的函数模型,分析模型参数、干燥曲线、相对干燥回潮率、有效水分扩散系数(Deff)、干燥活化能等指标,对比低温阴干和低温回潮干燥条件下当归的干燥特性。结果 低温阴干和低温回潮干燥方法均可使当归干燥,且低温回潮干燥方法可极大缩短当归的干燥周期,Weibull函数模型及线性回归拟合方程结果理想,当归低温阴干Deff为0.209 59 mm2/h,低温回潮干燥Deff在4.489 40~4.566 90 mm2/h,低温干燥条件下当归干燥活化能为80.75 kJ/mol。结论 低温回潮干燥方法较传统低温阴干具有明显优势,该研究可为提升当归传统阴干干燥技术,建立新的适宜当归产地加工的干燥方法提供理论和技术依据。
[Key word]
[Abstract]
Objective To clarify the effects of low temperature and dry in shade on the drying process of Angelicae Sinensis Radix (ASR), the drying and regain characteristics of ASR under low temperature drying and low temperature resurgence drying conditions were studied. Methods Weibull distribution function and 1stOpt software were used to simulate the functional model of ASR under low temperature dry and low temperature (40, 55℃) resurgence conditions, analyze model parameters, drying curve, relative dry moisture regain, moisture effective diffusion coefficient (Deff), dry activation energy and other indicators, and compare the drying characteristics of ASR under low temperature dry and low temperature resurgence drying conditions. Results Both low temperature drying and low temperature resurgence drying methods can make ASR dry, while low temperature resurgence drying method can greatly shorten the drying cycle of ASR, the Weibull function model and the linear regression fitting equation result meet the requirements. The Deff of ASR under low temperature drying conditions was 0.209 59 mm2/h, and the Deff under low temperature resurgence and drying conditions was between 4.489 40-4.566 90 mm2/h, the dry activation energy under low temperature drying condition was 80.75 kJ/mol. Conclusion The low temperature resurgence drying method has obvious advantages over the traditional low temperature drying, this research can provide theoretical and technical basis for improving the traditional low temperature drying technology of ASR and establishing a new drying method suitable for the processing of ASR origin.
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[基金项目]
国家中药标准化项目“当归等4种中药饮片标准化建设”(ZYBZH-Y-GS-11);甘肃省重点研发计划“陇药当归、党参原产地加工关键技术提升研究”(18YF1FA085);甘肃省自然科学基金“当归水分含量测定方法代替研究”(1508RJZA013);兰州市人才创新创业项目“‘滋阴益肺’制剂的研发”(2017-RC-19)