Ethanol, chloroform, ethyl acetate,

Ethanol, chloroform, ethyl acetate, n-butanol, acetone,acetic acid, perchloric acid, methylene chloride and methanolwere purchased from Shanghai Chemicals andReagents Co. (Shanghai, China); vanillin was purchasedfrom Beijing Chemicals and Reagents Co. (Beijing, China);oieanolic acid standard was supplied by the China Institutefor Drugs and Biological Products Identification (Beijing,China). All the reagents were analytical grade

Ethanol, Chloroform, Ethyl acetate, n-butanol, Acetone,
acetic acid, perchloric acid, methylene chloride and methanol
were Purchased from Shanghai Chemicals and
Reagents Co. (Shanghai, China); vanillin was Purchased
from Beijing Chemicals and Reagents Co. (Beijing, China);
Oieanolic acid standard was supplied by The China Institute
for Drugs and Biological Products Identification (Beijing,
China). All the reagents were analytical grade

Ethanol chloroform ethyl acetate,,,,, n-butanol acetone
acetic acid perchloric acid, methylene chloride, and methanol
were. Purchased from Shanghai Chemicals and
Reagents Co. (Shanghai China); vanillin, was purchased
from Beijing Chemicals and. Reagents, Co. (Beijing China);
oieanolic acid standard was supplied by the China Institute
for Drugs and Biological Products. Identification, (Beijing
.China). All the reagents were analytical grade.