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Quantitative Evaluation of Radix Astragali through the Simultaneous Determination of Bioactive Isoflavonoids and Saponins by HPLC/UV and LC-ESI-MS/MS

  • Kim, Jin-Hee (Department of Pharmaceutical Analysis, College of Pharmacy, Chung-Ang University) ;
  • Park, So-Young (Environmental Toxico-Genomic & Proteomic Center, College of Medicine, Korea University) ;
  • Lim, Hyun-Kyun (Department of Pharmaceutical Analysis, College of Pharmacy, Chung-Ang University) ;
  • Park, Ah-Yeon (Department of Pharmaceutical Analysis, College of Pharmacy, Chung-Ang University) ;
  • Kim, Ju-Sun (Department of Pharmaceutical Analysis, College of Pharmacy, Chung-Ang University) ;
  • Kang, Sam-Sik (Natural Products Research Institute, College of Pharmacy, Seoul National University) ;
  • Youm, Jeong-Rok (Department of Pharmaceutical Analysis, College of Pharmacy, Chung-Ang University) ;
  • Han, Sang-Beom (Department of Pharmaceutical Analysis, College of Pharmacy, Chung-Ang University)
  • Published : 2007.07.20

Abstract

The three major active isoflavonoids (calycosin-7-O-β -glucoside, isomucronulatol 7-O-β-glucoside, formononetin) and two main saponins (astragaloside I, astragaloside IV) in an extract of Radix Astragali were determined using rapid, sensitive, reliable HPLC/UV and LC-ESI-MS/MS methods. The separation conditions employed for HPLC/UV were optimized using a phenyl-hexyl column (4.6 × 150 mm, 5 μm) with the gradient elution of acetonitrile and water as the mobile phase at a flow rate of 1.0 mL/min and a detection wavelength of 230 nm. The specificity of the peaks was determined using a triple quadrupole tandem mass spectrometer equipped with an electrospray ionization (ESI) source that was operated in multiple reaction monitoring (MRM) in the positive mode. These methods were fully validated with respect to the linearity, accuracy, precision, recovery and robustness. The HPLC/UV method was applied successfully to the quantification of three major isoflavonoids in the extract of Radix Astragali. The results indicate that the established HPLC/UV and LC-ESI-MS/MS methods are suitable for the quantitative analysis and quality control of multi-components in Radix Astragali.

Keywords

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