摘要
以咖啡因脱除率为指标,在单因素试验的基础上,利用二次正交旋转组合设计与响应面法优化超临界CO2脱除绿茶咖啡因的工艺参数,考察了萃取压力、萃取温度和萃取时间对咖啡因脱除率的影响,并确定了回归模型.结果表明:回归方程极显著,拟合性好;脱除绿茶咖啡因的最优工艺参数为茶叶含水率40%、萃取压力30 MPa、萃取温度60℃、萃取时间150 min;在最佳工艺条件下,咖啡因脱除率为87.19%.
Taking the caffeine removal rate as the index,the paper optimized the green tea caffeine removal process using quadratic-orthogonal-rotation-combination design and response surface methodology,and studied the effects of extraction pressure,extraction temperature and extraction time on the caffeine removal rate,and also determined the regression model.The results showed that the regression equation was significant and had excellent goodness of fit;the optimized conditions for removing caffeine from green tea were water content 40%,extraction pressure 30 MPa,extraction temperature 60 ℃,and extraction time 150 min;under the optimized conditions,the caffeine removal rate reached 87.19%.
出处
《河南工业大学学报（自然科学版）》
CAS
北大核心
2011年第3期45-50,共6页
Journal of Henan University of Technology：Natural Science Edition
关键词
超临界CO2
萃取
绿茶
咖啡因
响应面法
supercritical CO2
extraction
green tea
caffeine
response surface methodology
