Establishment of QuEChERS-UPLC-MS/MS method to determine three kinds of ochratoxins in coffee

oleh: GAO Yunkai, CHEN Xiaomei, CHEN Chunqian, ZHOU Lingyu, DENG Yinglin, YIN Qingchun

Format: Article
Diterbitkan: ZHU Beiwei 2023-12-01

Deskripsi

<b>Objective:</b> A new method was developed for the simultaneous determination of three kinds of ochratoxins in coffee by ultra-high performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) combined with QuEChERS pretreatment. <b>Methods:</b> Samples were extracted by acetonitri-water-formic acid solution (55∶40∶5) with ultrasonic, salted out with a QuEChERS salt pocket, and then purified with a (ZanChERS-Myco17) column. The chromatographic separation was performed on an ACQUITY UPLC BEH C<sub>18 </sub>(1.7 μm, 2.1 mm×100 mm) column by gradient elution using a mobile phase comprising 0.2% formic acid aqueous solution and acetonitrile. In the positive ion mode of electric spray, the samples detected were used by multiple reaction monitoring (MRM) modes with internal standard method. <b>Results:</b> Three target substances had a good linear relationship in the range of 0.1~20.0 ng/mL, and the correlation coefficient was greater than 0.999 46. The detection limit and quantitative limit were 0.1~0.2 μg/kg and 0.2~0.7 μg/kg, respectively. Average recoveries at three spiked levels in the coffee matrix were 79.0%~103.3% with a relative standard deviation of 1.5%~7.6%. <b>Conclusion:</b> This method has the advantages of simple sample pretreatment, good reproducibility and high efficiency, and is suitable for the high-throughput detection of multiple ochratoxins in different coffee samples.