摘要
以茶叶为原料,采用超临界CO2萃取技术提取咖啡碱,用紫外分光光度法测定咖啡碱含量,采用正交试验设计考察了压力、温度、时间和夹带剂种类对咖啡碱提取率的影响。结果表明:30%乙醇做夹带剂,萃取温度为40℃,萃取压力为25MPa,萃取4h,此工艺条件下咖啡碱的提取率为3.95%。
The caffeine was extracted from tea by supercritical CO2 extraction technology in this paper.The caffeine was measured by ultraviolet spectrophotometry method.The extracting rate of the caffeine was chosen as the detective index and the optimum extraction conditions were investigated.The orthogonal test was used to investtigate the effects of pressure,temperature,extract time,the species of cosolvent on the extracting rate of the caffeine.The results indicated that when using 30% ethanol as cosolvent,extracting pressure was 25MPa,at 40℃ for 4h,The extracting rate of the caffeine was up to 3.95%.
出处
《食品与发酵科技》
CAS
2011年第5期34-36,共3页
Food and Fermentation Science & Technology
基金
西华大学研究生创新基金
编号:YCJJ201174
关键词
超临界流体萃取
咖啡碱
茶叶
紫外分光光度法
Supercritical Fluid Extraction
Caffeine
Tea
Ultraviolet spectrophotometry
