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Development Of A Validated Direct Injection-Liquid Chromatographic Tandem Mass Spectrometric Method Under Negative Electrospray Ionization For Quantitation Of Nine Microcystins And Nodularin-R In Lake Water

文献类型: 外文期刊

作者: Zhang, HY; Gonzales, GB; Beloglazova, NV; De Saeger, S; Shen, JZ; Zhang, SX; Yang, SP; Wang, ZH

作者机构:

关键词: Cyanotoxin; Lc-Ms; Analytical Method; Water Analysis

期刊名称: JOURNAL OF CHROMATOGRAPHY A

ISSN: 0021-9673

年卷期: 2020 年 1609 卷

页码:

收录情况: JCR(2021版) ; EI(2021版)

摘要: Microcystins (MCs) are cyclic heptapeptide toxins produced by various cyanobacterial genera that are toxic to both animals and humans. In this study, a novel strategy was proposed for the quantitation of nine MCs and Nodularin-R (NOD) in lake water using UHPLC-MS/MS under negative ionization mode, in which only centrifugation was employed during sample preparation. As a result, limits of quantification (LOQ) ranging from 0.05 to 0.1 mu g/L for all studied compounds were obtained in water samples, which were lower than the results obtained using positive ionization mode. Additionally, validation was performed by spiking three different levels of MCs at 0.05 or 0.1, 0.5, 1.0 mu g/L (n = 6). Recoveries ranged from 88.6% to 101.8%, and intraday and interday variability were lower than 12% and 14%, respectively, for all targeted compounds. Furthermore, the proposed method was applied to investigate microcystins contamination in fifty lake water samples collected in different regions in China. As a result, MC-LR, MC-RR, MC-YR, MC-WR, MC-LW, MC-LA, MC-LY, and MC-HilR were detected in lake water samples at trace level ranging from 0.06 to 0.37 mu g/L. The obtained results indicated that it was necessary to monitor the presence of MCs in lake water, especially during regular cyanobacterial blooms during warmer months. (C) 2019 Elsevier B.V. All rights reserved.

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