title: [Study on HPLC fingerprint of flavonoids from Houttuynia cordata by comparing with fingerprint reference].
abstract: OBJECTIVE
  To establish a stable and repeatable HPLC fingerprint standard and evaluate the flavonoids from Houttuynia cordata qualitatively and quantitatively.
  
  
  METHODS
  HPLC separation was performed on a C18 column with methanol-0.1% phosphoric acid mixed solution as mobile phase in gradient elution mode. The fingerprint reference was determined as one of the most typical chromatograms and used to be compared with other samples through Cosine and Relative Euclid Distance methods, thus the chromatographic fingerprints of flavonoids from Houttuynia cordata were evaluated by constitutes and contents, respectively.
  
  
  RESULTS
  Fourteen mutual peaks were fixed in the HPLC fingerprint of flavonoids from Houttaynia cordata. It showed good results in validation tests in which the quercitrin's peak was set as the reference peak to calculate relative retention time and area of other peaks in the chromatograms, and the RSD were less than 0.2% and 5.0%, respectively. The linear ranges for quercitrin was 1.07-83.4 microg/mL (r=0.9999) and the average recovery was 100.3%.
  
  
  CONCLUSIONS
  The method shows good repeatability, ruggedness and reliability. Comparing with the established reference fingerprint, the evaluation system including Cosine and Relative Euclid Distance methods lays dependable foundation for controlling the quality of Houttuynia cordata.
authors.affiliation: Nanjing Municipal Second Hospital Affiliated to Medical College of Southeast University, Nanjing 210003, China. tingtingzh826@hotmail.com
authors.forename: Ting-Ting
authors.initials: TT
authors.lastname: Zhang
authors.forename: Yi
authors.initials: Y
authors.lastname: Wu
authors.forename: Tai-Jun
authors.initials: TJ
authors.lastname: Hang
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D005419:Flavonoids / Q000737:chemistry*; D052859:Houttuynia / Q000737:chemistry* / Q000254:growth & development; D010946:Plants, Medicinal / Q000737:chemistry* / Q000254:growth & development; D011786:Quality Control; D015203:Reproducibility of Results
chemical_list: D004365:Drugs, Chinese Herbal; D005419:Flavonoids