栀子药材不同干燥方法水分动态过程模拟及其对多元活性成分的影响

为了探讨热风干燥、红外干燥、真空干燥与干燥温度对栀子干燥过程水分脱除及成品品质的影响,本文采用Weibull分布函数对其干燥动力学曲线进行拟合,并测定其干燥成品中栀子苷、西红花苷Ⅰ、西红花苷Ⅱ、京尼平-1-β-龙胆二糖苷的含量。结果表明:Weibull分布函数能较好地模拟栀子药材干燥过程(R^2=0.9936~0.9998),红外干燥过程属于降速干燥(β<1),真空干燥与热风干燥过程脱水速率呈现先升高后降低的趋势(β>1),尺度参数α随干燥温度升高而降低,不同干燥方式对尺度参数α也有较大影响,但随温度升高差异缩小。热风干燥、红外干燥、真空干燥干燥活化能分别为40.74、54.73、87.46 kJ/mol。在相同干燥方法下,随着干燥温度升高,西红花苷Ⅰ、西红花苷Ⅱ、京尼平-1-β-龙胆二糖苷呈升高趋势,栀子苷无明显升高或下降趋势;基于活性成分综合评价结果显示,50℃红外干燥方法得到的样品品质较佳,综合考虑干燥时间与干燥能耗,70℃红外干燥方法可作为栀子药材的适宜干燥方法。

Modelling of the Moisture Dynamic Process and Effects on Multiple Functional Components of Gardenia jasminoides Ellis with Different Drying Methods

In order to investigate the effects of different drying methods and temperatures on the moisture removal and quality of the finished products during the drying process of Gardenia jasminoides Ellis,the Weibull distribution function was used to fit the drying kinetic curve,and the content of geniposide,crocin I,crocin II and genipin-1-β-gentiobioside in the dried products was determined. The results showed that the Weibull distribution function did well in simulating the drying curves of the Gardenia jasminoides Ellis under the experimental conditions(R^2=0.9936~0.9998).The drying process of the infrared drying belonged to the falling-rate drying period(β<1). The drying rate of vacuum drying and hot air drying present a rising trend at the beginning but a downward trend as time went on(β>1). The scale parameter α decreased as the temperature increased,and the α was related to the different drying methods,but the difference narrowed with the increase of temperature. The activation energy for moisture diffusion of hot air drying,infrared drying,and vacuum drying were 40.744,54.73,and 87.46 kJ/mol,respectively. Under the same drying method,the retention of crocin I,crocin II and genipin-1-β-gentiobioside showed an increasing trend,and the retention of geniposide did not show any increasing or decreasing trend with the increased of drying temperature;The results of comprehensive evaluation which based on the content of functional components showed that the quality of the sample obtained by infrared drying at 50 ℃ was better,while considered the drying time and drying energy consumption,the drying method of infrared drying at 70 ℃ could be uesed as a suitable drying method for Gardenia jasminoides Ellis.