摘要
目的：研究不同干燥条件对板桥党参片气体射流冲击干燥质量的影响,确定干燥工艺并建立干燥模型。方法：研究不同风温（40、50、60和70℃）、切片厚度（1、2、3和4 mm）和风速（8、10、12和14 m/s）对党参多糖含量、复水比及干燥曲线的影响,以党参多糖含量、复水比及干燥时间为指标,确定干燥工艺;并将干燥曲线试验数据与所选4个干燥模型进行拟合,以确定系数（R2）、卡方（χ2）及均方根误差（RMSE）为评价指标,筛选最适合干燥模型。结果：风温、切片厚度和风速的改变都会导致党参多糖含量、复水比和干燥曲线的变化,但风温的影响最为显著,在试验条件下党参多糖含量、复水比和干燥时间分别在20.33%~28.26%、2.65~3.25和180~510 min之间。所选4个干燥模型中Modified Page模型与干燥曲线数据拟合度最高,有最大的平均R2（0.9993）、最小的平均χ2（0.00022）及较小的RMSE（0.01066）。结论：综合考虑党参多糖含量、复水比及干燥时间,确定板桥党参片的气体射流冲击干燥工艺条件为风温60℃、切片厚度2 mm、风速12 m/s;在风温40~70℃、切片厚度1~4 mm、风速8~14 m/s条件下,板桥党参片的气体射流冲击干燥模型为Modified Page模型,经验证该模型可有效预测板桥党参片在干燥过程中的水分变化。
Objective： To determine the drying process and to built model of Banqiao Codonopsis Radix slices dried in air-impingement jet dryer. Methods： With taking the content of polysaccharides（ CPPS）,rehydration ratio（ RR） and drying time as the evaluation indexes,the effects of drying temperature（ 40,50,60 and 70 ℃）,slices thickness（ 1,2,3 and 4 mm） and air velocity（ 8,10,12,and 14 m / s） on the content of CPPS,RR and drying time were studied. With taking the R2,χ2and RMSE as the evaluation indexes,the optimum model was screened by fitting the drying curves data with four selected models. Results： The variety of all studied factors lead to change of the content of CPPS,RR and drying time,and the influence of air-temperature was most significant. Under the test conditions,the content of CPPS,RR and drying time were range from 20. 33% ~ 28. 26%,2. 65 ~ 3. 25 and 180 ~ 510 min,respectively. Among the four selected drying models,Modified Page model was the most suitable model to fit the drying curves data with the maximum average of R2（ 0. 9993）,the smallest average of χ2（ 0. 00022） and the smaller average RMSE（ 0. 01066）. Conclusion： By comparison the content of CPPS,RR and drying time,the optimal drying process of Banqiao Codonopsis Radix slices dried in the air-impingement jet dryer was air temperature of 60 ℃,slice thickness of 2 mm and air velocity of 12 m / s. Under the drying conditions of air temperature 40 ~ 70 ℃,slice thickness 1 ~ 4 mm and air velocity 8 ~ 14 m / s,Modified Page model can effectively predict the moisture change of Banqiao Codonopsis Radix slice dried in air-impingement jet dryer.
出处
《中药材》
CAS
CSCD
北大核心
2016年第3期534-539,共6页
Journal of Chinese Medicinal Materials
基金
陕西省自然科学基金(2015JM3097)
关键词
板桥党参片
川党参
气体射流冲击
干燥工艺
干燥模型
Banqiao Codonopsis Radix Codonopsis tangshen Oliv Air-impingement jet Drying process Drying model
