The best extraction conditions of humic acid are as follows: reaction temperature 90℃, reaction time 60min, NaOH is used at concentration of 1.5wt%, or 2wt% NaOH and Na2CO3 (the ratio of NaOH and Na2CO3 is 1:1),and the extraction rate is more then 75%.
The results showed that the optimal extracting technology was different among the skins of selected fish. Under the optimal extraction conditions, the extraction ratios of collagens from these skins were 36.57%, 30.58%, 35.14% and 45.17% respectively, while the corresponding yields were 8.93%, 8.52%, 9.03% and 6.50% respectively.
The optimum extraction conditions for spirmycin are 5.0% N 1923 , pH 9.56, O/A=1∶1, extraction rate is 90.5%, that for erythromycin are 7.5% N 1923 , pH 9.50, O/A=1∶1, extraction rate is 91.0%.
The extraction conditions were optimized. The opti-mized operational variables of SFE-CO2are obtained as following:the pressure is 25 MPa,the temperature is 100 ℃,the staticextractiontime is 20 min,the dynamic extraction time is 45 min,the trapping solvent is acetone,the CO2flow rate is2.5 mL/min andthe modifier is 10 %dichloromethane.
Conclusion The extraction rate of volatile oils from Heracleum hemsleyanum Diels by supercritical CO_2extraction process is higher than that of water vapor distillation,and the optimized extraction conditions are:extraction pressure 25MPa,extraction temperature 45℃ and flow rate of CO_2 20L/h,and the yield of volatile oils is 0.65%.
The results demonstrated that the optimum extraction conditions are liquid-solid ratio of 1∶40(g∶mL), microwave power of 540 W,extracting time of 50 s and the extracting rate of hippophae rhamnoides L. polysaccharide come to 5.25%.
Conclusion The optimum extraction conditions for compound shechuang tincture is as follow:adding 13 times 70% ethanol infusing 24 h,percolating at the speed of 3 ml·min-1·kg-1.
The results showed that the optimal extracting technology was different among the skins of selected fish. Under the optimal extraction conditions, the extraction ratios of collagens from these skins were 36.57%, 30.58%, 35.14% and 45.17% respectively, while the corresponding yields were 8.93%, 8.52%, 9.03% and 6.50% respectively.
Theoptimum extraction conditions of tea green pigment were 100% ethanol, theratio of ethanol to tea 4.5mL:1g, the temperature 75oC and the extractionduration 25min. The extraction rate of tea green pigment was 31.50%, it wasimproved by 20.69% than the 26.1% from the past document.
Conclusion The optimum extraction conditions for compound shechuang tincture is as follow:adding 13 times 70% ethanol infusing 24 h,percolating at the speed of 3 ml·min-1·kg-1.
Results showed that optimum extraction conditions are: sonic power ranges from 86W to 96W with extraction temperature from 45℃ to 53℃, and time 20min and stock ratio of 1:20. The best decolorant is polyamide.
The results indicated that optimum extraction conditions were determined as follows:the mixture solution of V(ethyl acetate) and V(95% ethanol)(3∶7) as extracting solvent,stock ratio 1∶10(mass∶volume),temperature 50 ℃,time 30 min.
结果表明,超声提取沙棘果渣总黄酮的最佳提取工艺条件为:提取液V(乙酸乙酯)∶V(体积分数95%乙醇)=3∶7,料液比(m/V)为1∶10,在温度50℃下提取30 m in;
The optimum extraction conditions were as follows:sample 2 g,microwave radiant intensity 550 W,irradiation time 75 min,ratio of solid to liquid 1∶12.5,soda concentration 16%,the absorbency of lignin extracting solution was 1.25 and the result of reappear experiment was stabilization.