title: Analysis of Rhizoma Polygoni Cuspidati by HPLC and HPLC-ESI/MS.
abstract: An HPLC method with photodiode array detection (PAD) and ESI/MS detection was developed for the qualitative and quantitative analysis of the major chemical constituents of the dried rhizome of Polygonum cuspidatum Sieb. et Zucc. (Rhizoma Polygoni Cuspidati; Chinese name Hu-Zhang). Based on the chromatographic separation on an Altima C(18) column using 0.5% aqueous acetic acid and acetonitrile as the mobile phase, nine compounds, including stilbenes, stilbene glucosides, anthraquinones and anthraquinone glucosides, were identified by online ESI/MS analysis and seven were quantified by HPLC-PAD. A full validation of the method including sensitivity, linearity, repeatability and recovery was conducted. Linear calibration was achieved over the concentration range 1-200 mg/L with R(2) > 0.999, whilst the limits of detection ranged from 0.51 to 1.57 ng. Repeatability was evaluated by intra- and inter-day assays and the RSD value was within 1.79%. Recoveries of the quantified compounds were within the range 96.0-100.1% with RSD values of less than 2.2%. Five samples of Rhizoma Polygoni Cuspidati from different regions were analysed using the developed method. The major constituents piceid, resveratrol, emodin-8-O-beta-D-glucoside and emodin were selected to provide an index for the quality assessment of the herbal drug.
authors.affiliation: West China School of Pharmacy, Sichuan University, No. 17 Section 3 Ren-Min-Nan-Lu Road, Chengdu, Sichuan 610041, People's Republic of China.
authors.forename: Tao
authors.initials: T
authors.lastname: Yi
authors.forename: Hao
authors.initials: H
authors.lastname: Zhang
authors.forename: Zongwei
authors.initials: Z
authors.lastname: Cai
mesh_terms: D002851:Chromatography, High Pressure Liquid; D045468:Fallopia japonica / Q000737:chemistry*; D015394:Molecular Structure; D015203:Reproducibility of Results; D027343:Rhizome / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization