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Efficient High-Performance Liquid Chromatography with Liquid-Liquid Partition Cleanup Method for the Determination of Pymetrozine in Tobacco

Xian Zhang, Xinsheng Cheng *, Chuanqin Wang, Zheng Xi, Qiuhua Li
Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China

email: Xinsheng Cheng (xscheng@ustc.edu.cn)
*Correspondence to Xinsheng Cheng, Department of Chemistry, University of Science and Technology of China, Hefei 230026, PR China, Tel.: +86-551-3492135

For the first time, a novel, simple and reliable method for analysis of pymetrozine residues in flue-cured tobacco leaves has been developed utilizing HPLC-UV with liquid-liquid partition cleanup. Pre-treatment with ultrasonic extraction and liquid-liquid partition procedures gave preferable baseline separation and clean chromatograms by removing water-soluble and fat-soluble components which interfere with pymetrozine in the test. The performance of the method was evaluated and validated: the detection limit (LOD) was 0.005 g.mL-1, the relative standard deviation (RSD) was 1.2 % (n=5), and the overall recovery was above 90 % at fortification levels of 0.200, 0.500, 1.000, and 5.000 mg.kg-1. The proposed method was successfully employed for the determination of pymetrozine residues in twelve flue-cured tobacco samples collected from different regions of China.

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