目的:微波萃取法提取桑叶和桑白皮中黄酮类成分。方法:采用正交试验设计优选出微波萃取的最佳工艺条件,并与传统醇提法相比较,同时比较桑的不同部位药材的黄酮含量。结果:微波萃取黄酮类成分的最佳工艺条件为:70%乙醇12倍量,于60℃萃取2...目的:微波萃取法提取桑叶和桑白皮中黄酮类成分。方法:采用正交试验设计优选出微波萃取的最佳工艺条件,并与传统醇提法相比较,同时比较桑的不同部位药材的黄酮含量。结果:微波萃取黄酮类成分的最佳工艺条件为:70%乙醇12倍量,于60℃萃取20 m in,其中提取溶剂对结果有显著影响。桑叶中的黄酮含量约为桑白皮中的9倍,且应用微波萃取法比传统醇提法分别高55%和32%。结论:微波萃取法在提取时间、溶剂用量及得率等方面明显优于传统的醇提法,适于工业生产。展开更多
In this study a novel microwave-assisted extraction(MAE) device was presented. In this newly developed system, a 3/4 wavelength microwave resonance cavity was used as the microwave coupling device for replacing a trad...In this study a novel microwave-assisted extraction(MAE) device was presented. In this newly developed system, a 3/4 wavelength microwave resonance cavity was used as the microwave coupling device for replacing a traditional microwave oven. This device is used to extract flavonoids from Radix et caulis acanthopanacis senticosi. The effects of solvent concentration, microwave forward power and solvent uptake rate on the extraction yield of flavonoids were investigated by using orthogonal experimental design. The results show that the effects of the solvent(ethanol) concentration and solvent uptake rate on the extraction yield of flavonoids are very significant, the effect of the interaction of solvent concentration and solvent uptake rate is significant and the effects of the other factors are general. Under the optimal conditions of MAE the extraction yield of flavonoids by this system is 46% higher than that by Soxhlet method. The RSD of the method was lower than 6%.展开更多
文摘目的:微波萃取法提取桑叶和桑白皮中黄酮类成分。方法:采用正交试验设计优选出微波萃取的最佳工艺条件,并与传统醇提法相比较,同时比较桑的不同部位药材的黄酮含量。结果:微波萃取黄酮类成分的最佳工艺条件为:70%乙醇12倍量,于60℃萃取20 m in,其中提取溶剂对结果有显著影响。桑叶中的黄酮含量约为桑白皮中的9倍,且应用微波萃取法比传统醇提法分别高55%和32%。结论:微波萃取法在提取时间、溶剂用量及得率等方面明显优于传统的醇提法,适于工业生产。
文摘In this study a novel microwave-assisted extraction(MAE) device was presented. In this newly developed system, a 3/4 wavelength microwave resonance cavity was used as the microwave coupling device for replacing a traditional microwave oven. This device is used to extract flavonoids from Radix et caulis acanthopanacis senticosi. The effects of solvent concentration, microwave forward power and solvent uptake rate on the extraction yield of flavonoids were investigated by using orthogonal experimental design. The results show that the effects of the solvent(ethanol) concentration and solvent uptake rate on the extraction yield of flavonoids are very significant, the effect of the interaction of solvent concentration and solvent uptake rate is significant and the effects of the other factors are general. Under the optimal conditions of MAE the extraction yield of flavonoids by this system is 46% higher than that by Soxhlet method. The RSD of the method was lower than 6%.