(Kanto Chemical Co.,
Tokyo, Japan). The HPLC assay for the quantitative determination of
ursolic acid and oleanolic acid inMEOA, EEOA andWEOA was carried
out as described by Chen et al. (20). Elution was performed at room
temperature and utilized acetonitrile as solvent A and 1.25% H3PO4 in
water as solvent B. The mobile phase