title: [Determination of salylic acid, syringic acid, benzoic acid and anthranilic acid in Radix Isatidis by HPCE].
abstract: OBJECTIVE
  To develop a simple and rapid capillary electrophoresis (CE) method for the separation and determination of four active organic acids including salicylic acid, syringic acid, benzoic acid, and anthranilic acid in Radix Isatidis.
  
  
  METHODS
  The HPCE system consisted of a fused-silica capillary column of 47.3 cm (38.3 cm to the detector) x50 microm i.d. and a mixture ofacetonitrile-borate buffer (15% acetonitrile, 25 mmol L(-1) borate, 15 mmol L(-1) beta-CD, pH 9.10) solution as the operating buffer. The applied voltage was 11.5 kV and the UV detection was set at 220 nm. The effects of the applied voltage, detection wavelength, and the pH of buffer, the concentration of buffer, acetonitrile and beta-CD were investigated.
  
  
  RESULTS
  The linear calibration rang was 3.0-90 mg L(-1) (r=0.9994) for salylic acid, 4.0-120 mg L(-1) (r=0.9995) for syringic acid, 2.0-60 mg L(-1) (r=0.9998) for benzoic acid and 5.0-100 mg L(-1) (r=0.9992) for anthranilic acid. The recoveries of salylic acid, syringic acid, benzoic acid and anthranilic acid were 95.9%-102.6%, 98.6%-103.4%, 98.7%-104.1%, 96.1%-104.3% respectively. The detection limits of salylic acid, syringic acid, benzoic acid and anthranilic acid were 0.7, 1.1, 1.2 and 1.5 mg L(-1), respectively.
authors.affiliation: School of Pharmacy, Shanghai Jiao Tong University, Shanghai 200030, China.
authors.forename: Xiaoxue
authors.initials: X
authors.lastname: Wang
authors.forename: Wenjie
authors.initials: W
authors.lastname: Zheng
authors.forename: Guoxiang
authors.initials: G
authors.lastname: Xie
authors.forename: Mingfeng
authors.initials: M
authors.lastname: Qiu
authors.forename: Wei
authors.initials: W
authors.lastname: Jia
mesh_terms: D019817:Benzoic Acid / Q000032:analysis*; D019075:Electrophoresis, Capillary; D005707:Gallic Acid / Q000031:analogs & derivatives* / Q000032:analysis; D031219:Isatis / Q000737:chemistry*; D016014:Linear Models; D015203:Reproducibility of Results; D020156:Salicylic Acid / Q000032:analysis*; D012680:Sensitivity and Specificity; D062367:ortho-Aminobenzoates / Q000032:analysis*
chemical_list: D062367:ortho-Aminobenzoates; C031385:anthranilic acid; D005707:Gallic Acid; D019817:Benzoic Acid; C001945:syringic acid; D020156:Salicylic Acid