Samples were extracted with acetone, purified by liquid-liquid partition and florisil chromatographic column, and washed by acetone-petroleum ether(1/3,V/V).

• 采用丙酮提取， 二氯甲烷液液分配萃取，弗罗里硅土+活性炭混和吸附剂进行净化，用丙酮/石油醚 （1/3，V/V）进行洗脱，浓缩定容，用气相色谱进行测定。