ABSTRACT
Objective To determine the optimum process of ZTC1+1Ⅱnatural clarifying agents edulcorated mulberry leaf extracts. Methods The remaining rate of mulberry leaf alkaloid,flavone,polysaccharide and the solids removal rate were used as indexes,optimized by single factor experiment to study the effect of some factors,such as the order and dosage of clarifying agents,the concentration and the temperature of the extracting solution,whisking time,whisking speed and holding time,response surface methodology was selected to decide the best clarfication process. Results The optimal process:the order of the ZTC1+1Ⅱ natural clarifying agents was part B after part A,the dosage of clarifiers B and A were 10% and 5%volume of the extract,the extract solution was 0.17 g·mL-1 ,the temperature was 76 ℃,the whisking speed was 120 r·min-1 , the whisking time was 10 min,80 ℃ holding 30 min,and standing time was 12 h,the remaining rate of mulberry leaf alkaloid, flavone and polysaccharide were 92.5%,90.2% and 91.1%,the solids removal rate was 26.5%. Conclusion ZTC1+1Ⅱnatural clarifying agents could effectively purify the extracts of mulbery leaf,optimized by the response surface method,the method is simple and feasible,and clarity is good.
ABSTRACT
OBJECTIVE:To optimize the ultrasonic extraction process of total alkaloids from mulberry leaves. METHODS:Based on the single factor experiment,response surface method was adopted to investigate the effects of ultrasonic extraction time, ultrasonic power,ethanol volume fraction,solid-liquid ratio and pH of solvent on the extraction rate of total alkaloids from mulber-ry leaves,then test data were analyzed by Design Expert 8.0.5 software,and the optimized process was confirmed and verified. RE-SULTS:The multiple correlation coefficient of established binomial equation fitting model was 0.969 9;the optimized condition for extracting alkaloid from mulberry leaf was ultrasonic extraction time of 48 min,ultrasonic extraction power of 800 W,ethanol vol-ume fraction of 70%,material-liquid ratio of 1∶25,pH 5. Under these conditions,the extraction rate of total alkaloids was 0.422%, with the bias ratio was less than 2% compared with the model predictions. CONCLUSIONS:The established model has good fit-ting performance,the extraction process is stable and reliable,and can be used for the extraction of alkaloids from mulberry leaves.