title: [Determination of corosolic acid in Eriobotrya japonica leaves by reversed-phase high performance liquid chromatography].
abstract: Corosolic acid is clinically proven to activate cell glucose-transporter "shuttles" and thus helps balance blood glucose levels. A method was developed for the determination of corosolic acid in Eriobotrya japonica leaves by reversed-phase high performance liquid chromatography (RP-HPLC). The peak of corosolic acid in Eriobotrya japonica leaves was qualitatively analyzed by comparing the retention times and mass spectra of corosolic acid standard and the extract on HPLC-mass spectrometry (MS). Eriobotrya japonica leaves were extracted thrice for 3.0 h at 90 degrees C with 90% ethanol. The extract was concentrated and deposited by water to remove the impurity which interfered the determination. The deposit was dissolved by methanol and separated on an ODS column (250 mm x 4.6 mm i.d., 5 microm). Methanol-1.0% acetic acid (88:12, v/v) was used as the mobile phase with a flow rate of 0.8 mL/min. The detection wavelength was 215 nm. The linearity was good within the range of 1.0-6.0 microg (r = 0.9999). The corosolic acid content of Eriobotrya japonica leaves from Huangshan was 0.36%. The average recovery of corosolic acid was 99%. The method is simple, rapid, accurate and reliable for the determination of corosolic acid in Eriobotrya japonica leaves.
authors.affiliation: Anhui Analysis and Test Center, Hefei 230031, China. formatsky@tom.com
authors.forename: Changping
authors.initials: C
authors.lastname: Hu
authors.forename: Longsheng
authors.initials: L
authors.lastname: Chen
authors.forename: Yang
authors.initials: Y
authors.lastname: Xin
authors.forename: Qunxing
authors.initials: Q
authors.lastname: Cai
mesh_terms: D002851:Chromatography, High Pressure Liquid; D056148:Chromatography, Reverse-Phase; D018515:Plant Leaves / Q000737:chemistry; D027824:Rosaceae / Q000737:chemistry*; D014315:Triterpenes / Q000032:analysis*
chemical_list: D014315:Triterpenes; C113861:corosolic acid