title: [Content determination of epigoitrin in Radix Isatidis and its preparation by RP-HPLC].
abstract: OBJECTIVE
  To establish an HPLC method for the content determination of epigoitrin in Radix Isatidis and its preparation, and to provide valuable data for quality control of Radix Isatidis and its preparation.
  
  
  METHODS
  The samples were separated on a ZORBAX SB-C18 (4. 6 mm x 150 mm, 5 microm) column with the mobile phase of acetonitrile-water-phosphoric acid-triethylamine (8.50 : 90.72 : 0.73 : 0.05) in the flow rate of 0.7 mL x min(-1). The detection wavelength was set at 245 nm. Column temperature was 30 degrees C.
  
  
  RESULTS
  The linear range of epigoitrin was 0.0204-0.3060 microg (r = 0.9998), and the average recovery was 98.99% with the RSD was 1.31% (n = 9).
  
  
  CONCLUSIONS
  The method for quantitation of epigoitrin in Radix Isatidis and its preparation was accurate and reliable, which can be used to evaluate the quality of Radix Isatidis and its preparation.
authors.affiliation: Jiangsu Provincial Key Laboratory of New Drug Delivery System of Chinese Materia Medica & Key Laboratory of Scientific Preparation for Clinical Effective Prescription of State Administration of Traditional Chinese Medicine, Nanjing 210028, China.
authors.forename: Yi-Qiang
authors.initials: YQ
authors.lastname: An
authors.forename: Xiao-Bin
authors.initials: XB
authors.lastname: Jia
authors.forename: Hai-Jian
authors.initials: HJ
authors.lastname: Yuan
authors.forename: E
authors.initials: E
authors.lastname: Sun
authors.forename: Zhen-Zhen
authors.initials: ZZ
authors.lastname: Xu
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D031219:Isatis / Q000737:chemistry*; D015203:Reproducibility of Results
chemical_list: D004365:Drugs, Chinese Herbal