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KMID : 0620720100160020116
Natural Product Sciences
2010 Volume.16 No. 2 p.116 ~ p.122
Simultaneous Analysis of Bioactive Metabolites from Rehmannia glutinosa by HPLC-DAD-MS/MS
Won Tae-Hyung

Ryu Sung-Kwang
Kang Sam-Sik
Shin Jong-Heon
Abstract
A high-performance liquid chromatography (HPLC) with diode array detector (DAD) and electrospray ionization mass spectrometry (ESI-MS) was established for the simultaneous determination of five representative metabolites of the iridoid and phenolic classes from Rehmannia glutinosa. The optimal chromatographic conditions were obtained on an ODS column (5 mm, 4.6 ¡¿ 250 mm) with the column temperature at 25oC. The mobile phase was composed of water and acetonitrile using a gradient elution with the flow rate 0.3 mL/min. Detection wavelength was set at 205 nm. All calibration curves showed good linear regression (r2 > 0.997) within test ranges. Limits of detection (LOD) and quantitation (LOQ) values were lower than 0.123 and 0.373 ?g/mL, respectively. The developed method provided satisfactory precision and accuracy with overall intra-day and inter-day variations of 0.09 -0.76% and 0.16 -1.41%, respectively, and the overall recoveries of 99.03 -102.67% for all of the compounds analyzed. In addition, effectiveness of diverse extraction methods was compared to each other for the development of standard analytic method. The verified method was successfully applied to the quantitative determination of five representative metabolites in twenty-one commercial Rehmannia glutinosa samples from different markets in Korea and China. The analytical results showed that the contents of the five analytes vary significantly with sources.
KEYWORD
HPLC-DAD-MS, Rehmannia glutinosa, iridoids, phenolic compounds
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