[Determination of nucleosides in Rhizoma Pinelliae by high performance liquid chromatography].

A high performance liquid chromatographic (HPLC) method was established to determine nucleosides in Rhizoma Pinelliae, which is a dried stem tuber of Pinellia pedatisecta Schott in Pinellia plant belonging to Araceae family and has multiple efficiencies about down-bear counterflow and check vomiting, eliminating dampness and phlegm, etc. The separation of adenine, hypoxanthine, xanthine, uridine, thymine, adenosine and guanosine was achieved on a Lichrospher C18 column (150 mm x 4.6 mm, 5 microm) with the detection at 254 nm and gradient elution by acetonitrile-water containing 0.1% formic acid as the mobile phase. The linear ranges were from 1.6 mg/L to 50 mg/L for adenine, hypoxanthine, xanthine, uridine and guanosine, while from 1.2 mg/L to 40 mg/L for thymine and adenosine with correlation coefficients above 0.999 5. The average recoveries were between 98.9% and 101.2% with the relative standard deviations below 3%. The results of methodological study demonstrated that the method met the requirements of the determination. The nucleosides in Rhizoma Pinelliae from different districts were determined. The method is convenient and accurate with good reproducibility and can be used to evaluate the quality of Rhizoma Pinelliae.