菊花中黄酮成分加压提取的动力学研究

Kinetics of Pressurized Extraction on Flavonoid of Chrysanthemum Monfolium Ramat

研究了菊花中黄酮成分的加压提取动力学。利用提取传质过程中的"二阶"动力学模型,考察不同温度下黄酮成分的质量浓度与提取时间之间的关系,并推导提取过程中的提取速率常数和表观活化能。结果表明,菊花中黄酮成分的提取速率常数与温度有关,k=1.6×105 exp(-32 168.5/RT),得出提取动力学方程式为Ct=t/{1/[2.9×107exp(-6 002/T)]+t/(0.006T-1.465 3)},表观活化能为32 168.5J·mol-1。

The extraction kinetics of flavonoid from Chrysanthemum monfolium Ramat by pressurized extraction was investigated. The extraction model of a second-order mechanism was developed to predict the concentration of flavonoid with various extrac- tion temperatures. The extraction process was analysed to gain the parameter of Ea and the rate constant. The results showed that the rate constant is a function of the temper- ature, the relation of the rate constant with temperature was deduced, k= 1.6 × 10S × exp（-32 168.5/RT）,and the extraction kinetic equation was described. Ct =t/{ 1/[-2.9 × 107 ×exp （--6 002/T）]＋t/（0. 006T-1. 465 3）}, Ea was 32 168.5 J ·mo1-1.