Determination of Xinjunan pesticide residue in foodstuffs of plant origin by a modified QuEChERS method and ultra performance liquid chromatography-tandem mass spectrometry

• Published in: Food science & technology 2021-11, Vol.151, p.112101, Article 112101
• Main Authors: Han, Chao, Hu, Beizhen, Chen, Shubing, Wang, Nan, Hou, Jianbo, Jin, Na, Shen, Yan
• Format: Article
• Language: English
• Subjects: Foodstuffs of plant origin; Modified QuEChERS; UPLC-MS/MS; Xinjunan
• ISSN: 0023-6438; 1096-1127
• DOI: 10.1016/j.lwt.2021.112101

In this study, the determination of Xinjunan pesticide residue in apple, cottonseed, pepper, tomato, grape and pear by ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) was established. The samples were purified by a modified QuEChERS method. The analysis was performed by UPLC-MS/MS in multiple reaction monitoring (MRM) mode. Acetonitrile and 1.0 mmol L−1 ammonium acetate (containing 0.1% formic acid) were used as the mobile phases. The external standard method was used for quantification. The average recoveries were 75.6–106.2% with an RSD ≤8.8%. The limits of quantification (LOQs) were 2.0 μg/kg for apple, pepper, tomato, grape and pear and 10.0 μg/kg for cottonseed. The proposed method is fast, sensitive, simple, and accurate and could be used for the quantification of Xinjunan pesticide residue in foodstuffs of plant origin. [Display omitted] •First determination of Xinjunan residue in food by UPLC-MS/MS.•The accuracy of the results is based on MRM mode.•The samples were purified by a modified QuEChERS method.•The structure analysis of Xinjunan was carried out for the first time.