温度控制对微波萃取叶黄素酯的影响

探索温度控制对微波辅助萃取叶黄素酯萃取率的影响。首先测定不同输出功率对萃取溶媒升温的影响，然后以万寿菊干花颗粒为样品，探讨升温功率、萃取时间和萃取温度对萃取率的影响，并比较相同温度条件下微波萃取与溶剂法的萃取率。结果表明：分子中含有O－H键的溶媒升温较快；升温功率的变化对萃取率的影响有限。萃取时间的延长可导致萃取率下降；在1600W、20min和分别为50、50、40℃条件下，正己烷、乙酸乙酯和四氢呋喃萃取率分别为83%～95.23%、81.44%～96.59%和91.72%～94.40%。在相同温度条件下，微波萃取可有效地提高叶黄素酯的萃取率。

Effect of Temperature Control on Microwave-Assisted Extraction of Lutein Ester

Our present work aimed to investigate the effect temperature control on microwave-assisted extraction of lutein esters.The effect of different levels of microwave power on the time required to heat three different solvents from 10 ℃ to 50 ℃ was explored.Meanwhile,the extraction rate of lutein esters from dried marigold flower powder was investigated with respect to microwave power,extraction time and extraction temperature.In addition,a comparative investigation into the extraction of lutein esters was conducted using one of three different extraction solvents with and without the assistance of microwave treatment at the same temperature.The results obtained showed that solvent media molecules composed of O-H bond revealed rapid warm-up.However,heating power had limited impact on extraction rate of lutein esters.Prolonged extraction time could result in decreased extraction rate.Under the optimal extraction conditions of 1600 W,20 min and 50,50 ℃ and 40 ℃,the extraction rates of lutein esters with hexane,ethyl acetate or hydrocarbon furan as the extraction solvent were 83%-95.23%,81.44%-96.59% and 91.72%-94.40%,respectively.At the same temperature,microwave-assisted extraction greatly improved the extraction rate of lutein esters when compared with solvent extraction alone.