title: Analysis of ochratoxin A and ochratoxin B in traditional Chinese medicines by ultra-high-performance liquid chromatography-tandem mass spectrometry using [(13)C(20)]-ochratoxin A as an internal standard.
abstract: The paper reported a reliable analytical method for simultaneous determination of ochratoxin A (OTA) and ochratoxin B (OTB) in traditional Chinese medicines (TCMs) by ultra-high-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS). The development of the method and investigations on the matrix influence were described in particular. The matrix effects were thereby minimized by using a reliable internal standard and a simple sample pretreatment. The established method was further validated by determining the linearity (R(2) > or = 0.9990), average recovery (86.3-114.2%), sensitivity (limit of quantitation 0.03-0.19 ng mL(-1)) and precision (relative standard deviation < or = 13.1%). It was shown to be a suitable method for simultaneous determination of OTA and OTB in various TCMs. Finally, a total of 51 TCMs widely used in China were screened for OTA and OTB with the proposed method. The results showed that only 4 samples were contaminated with ochratoxins at low levels, indicating that it was low risk of ochratoxins to consumers who occasionally used TCMs.
authors.affiliation: College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, Zhejiang 310058, China.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Han
authors.forename: Yunliang
authors.initials: Y
authors.lastname: Zheng
authors.forename: Lianjun
authors.initials: L
authors.lastname: Luan
authors.forename: Yiping
authors.initials: Y
authors.lastname: Ren
authors.forename: Yongjiang
authors.initials: Y
authors.lastname: Wu
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods* / Q000592:standards; D004340:Drug Contamination / Q000517:prevention & control; D004365:Drugs, Chinese Herbal / Q000032:analysis*; D009793:Ochratoxins / Q000032:analysis*; D012015:Reference Standards; D053719:Tandem Mass Spectrometry / Q000379:methods* / Q000592:standards
chemical_list: D004365:Drugs, Chinese Herbal; D009793:Ochratoxins; C025589:ochratoxin A; C045354:ochratoxin B