Methods The essential oil was extracted by steam distillation from sunning-fixed sample and sulfur-smoke-driedsample, and their components were analyzed by GC-MS.
Ultrasonic extraction was used to extract the gypenosides from fresh leaves sample(F), fixed sample(X), baked sample(B), air-driedsample(A) and dry tea sample(D) of Gynostemma pentaphyllum.
用超声法提取绞股蓝鲜叶样、杀青样、烘干样、风干样以及绞股蓝袋泡茶干茶样的总皂甙, 并测定其含量。
3
The methanolic extract obtained from shellfish sample should be dried under nitrogen, keeping the concentration of methanol below 4%.