title: [HPLC determination of four components in Tibetan medicine Dangzuo of different Tibetan regions].
abstract: OBJECTIVE
  To develop an HPLC method for determination of gallic acid, hydroxysafflor yellow A, cinnamic aldehyde and piperine in Tibetan medicine Dangzuo, and to compare the content of four active components in Dangzuo of different Tibetan regions.
  
  
  METHODS
  The separation was carried out on a Waters XTerra RP-C18 column ( 4.6 mm x 250 mm, 5 microm). The mobile phases were methanol and water, all contained 0.1% glacial acetic acid, for gradient elution. The gradient program was as follows: 0-22.5 min, methanol was changed from 5% to 50%; 22.5-40 min, changed to 80% 80:20. The flow rate was 1.0 mL x min(-1). The detection wavelength was 270 nm. The reference wavelength was 500 nm.
  
  
  RESULTS
  The linear ranges of gallic acid, hydroxysafflor yellow A, cinnamic aldehyde and piperine were 0.040-0.640 microg (r = 0.999 8), 0.090-1.440 microg (r = 0.999 9), 0.031-0.500 microg (r = 0.999 9 ) and 0.092-41.477 microg (r = 0.998 9), respectively. The average recoveries (n = 6) were 97.42% (RSD 1.9%), 97.55% (RSD 2.9%), 98.69% (RSD 0.96%) and 96.72% (RSD 4.0%), respectively. The content ranges of gallic acid, hydroxysafflor yellow A, cinnamic aldehyde and piperine in Dangzuo samples of different Tibetan regions were 0.11341.69 mg x g(-1), 0.889-1.51 mg x g(-1), 0.000-40.606 mg x g(-1) and 1.96-2.73 mg x g(-1), respectively.
  
  
  CONCLUSIONS
  The method is a simple and effective for quality control of Tibetan medicine Dangzuo.
authors.affiliation: Northwest Plateau Institute of Biology, Chinese Academy of Sciences, Xining 810008, China. licen_601@126.com
authors.forename: Cen
authors.initials: C
authors.lastname: Li
authors.forename: Yuancan
authors.initials: Y
authors.lastname: Xiao
authors.forename: Hongxia
authors.initials: H
authors.lastname: Yang
authors.forename: Yuzhi
authors.initials: Y
authors.lastname: Du
authors.forename: Lixin
authors.initials: L
authors.lastname: Wei
mesh_terms: D000171:Acrolein / Q000031:analogs & derivatives* / Q000032:analysis / Q000302:isolation & purification; D000470:Alkaloids / Q000032:analysis* / Q000302:isolation & purification; D052117:Benzodioxoles / Q000032:analysis* / Q000302:isolation & purification; D002599:Chalcone / Q000031:analogs & derivatives* / Q000032:analysis / Q000302:isolation & purification; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004365:Drugs, Chinese Herbal / Q000737:chemistry; D005707:Gallic Acid / Q000032:analysis* / Q000302:isolation & purification; D038861:Medicine, Tibetan Traditional; D010880:Piperidines / Q000032:analysis* / Q000302:isolation & purification; D035261:Plant Components, Aerial / Q000737:chemistry; D010936:Plant Extracts / Q000032:analysis* / Q000302:isolation & purification*; D053284:Polyunsaturated Alkamides / Q000032:analysis* / Q000302:isolation & purification; D011786:Quality Control; D011809:Quinones / Q000032:analysis* / Q000302:isolation & purification; D012015:Reference Standards; D013056:Spectrophotometry, Ultraviolet / Q000379:methods
chemical_list: D000470:Alkaloids; D052117:Benzodioxoles; D004365:Drugs, Chinese Herbal; D010880:Piperidines; D010936:Plant Extracts; D053284:Polyunsaturated Alkamides; D011809:Quinones; C085278:hydroxysafflor yellow A; D002599:Chalcone; D005707:Gallic Acid; D000171:Acrolein; C012843:cinnamaldehyde; C008922:piperine