title: Determination of oleanolic acid, ursolic acid and amygdalin in the flower of Eriobotrya japonica Lindl. by HPLC.
abstract: Simple and accurate HPLC methods were developed for the determination of oleanolic acid (OA), ursolic acid (UA) and amygdalin in loquat (Eriobotrya japonica Lindl.) flower, which is commonly used for the treatment of various diseases as a traditional Chinese medicine. HPLC assay was performed on a reversed-phase C(18) column and all three compounds were detected at 210 nm with a flow rate of 1.0 mL/min. The mobile phase consisted of methanol (A) and 0.03 mol/L phosphate buffer (pH 2.8) (B) with a ratio of 88:12 (A:B, v/v) for simultaneous detection of OA and UA, and 25:75 (A:B, v/v) for detection of amygdalin. The established methods showed good precision and accuracy with overall intra-day and inter-day variation of 0.99-3.55 and 1.05-4.05%, respectively, and overall recoveries of 97.37-99.32% for the three compounds. Application of these methods to determine the OA, UA and amygdalin contents in loquat flower showed that cultivar had a minor effect on the contents of all three compounds, with average amounts of 0.38-0.51 mg OA/g dry weight (DW), 2.15-2.68 mg UA/g DW and 1.23-1.56 mg amygdalin/g DW among five loquat cultivars tested. However, developmental stages and flower tissues showed significant effect on the contents of all three bioactive components.
authors: Laboratory of Fruit Molecular Physiology and Biotechnology, The Ministry of Agriculture's Laboratory of Horticultural Plant Growth, Development and Biotechnology, Huajiachi Campus, Zhejiang University, Hangzhou 310029, People's Republic of China.
authors: Chunhua
authors: C
authors: Zhou
authors: Kunsong
authors: K
authors: Chen
authors: Chongde
authors: C
authors: Sun
authors: Qingjun
authors: Q
authors: Chen
authors: Wangshu
authors: W
authors: Zhang
authors: Xian
authors: X
authors: Li
mesh_terms: D000678:Amygdalin / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D031983:Eriobotrya / Q000737:chemistry*; D035264:Flowers / Q000737:chemistry*; D009828:Oleanolic Acid / Q000032:analysis*; D015203:Reproducibility of Results; D013056:Spectrophotometry, Ultraviolet; D014315:Triterpenes / Q000032:analysis*; D000097245:Ursolic Acid
chemical_list: D000678:Amygdalin; D009828:Oleanolic Acid; D014315:Triterpenes; D000097245:Ursolic Acid