Supercritical fluid extraction and quantification of aflatoxins in Zizyphi Fructus by liquid chromatography/atmospheric pressure chemical ionization tandem mass spectrometry

被引:21
|
作者
Liau, Bing-Chung
Jong, Ting-Ting
Lee, Maw-Rong
Chang, Chieh-Ming J.
机构
[1] Natl Chung Hsing Univ, Dept Chem, Taichung 40227, Taiwan
[2] Natl Chung Hsing Univ, Dept Chem Engn, Taichung 40227, Taiwan
关键词
D O I
10.1002/rcm.2870
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
An integrated method combining supercritical fluid extraction (SFE) with liquid chromatography/ atmospheric pressure chemical ionization tandem mass spectrometry (LC/APCI-MS/MS) was developed and successfully applied to quantify aflatoxins (AFs) in Zizyphi Fructus (fruits of Zizyphus jujube), a traditional Chinese medicine. To minimize the potential interferences caused by the complex matrix in Zizyphi Fructus, a SFE pretreatment was performed. In addition, electrospray ionization (ESI) and atmospheric pressure chemical ionization (APCD spectra were also compared. The results showed that the calibration curves of AFB(1), AFB(2), AFG(1), and AFG(2) were all linear over the range of concentration from 1 to 50 ng/g, the squared correlation coefficients (r(2)) were over 0.995, and the detection limits of the method were between 0.17 and 0.32 ng/g. It showed high recovery and good precision in quantitating AFs in Zizyphi Fructus without further clean-up. Further, fragmentation pathways of protonated AFs in APCI-MS/MS were clearly proposed which could predict the existence of AFB or AFG series. To test the empirical validity of the proposed methodology in this paper, eight random samples of Zizyphi Fructus collected from supermarkets and traditional Chinese medicine stores in different geographical areas of Taiwan were analyzed. The results indicated that low levels of AFs were detected in only one of them. Copyright (c) 2007 John Wiley & Sons, Ltd.
引用
收藏
页码:667 / 673
页数:7
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