Identification of Plant Metabolites of Environmental Contaminants by UPLC-QToF-MS: The in Vitro Metabolism of Triclosan in Horseradish
Identification of Plant Metabolites of Environmental Contaminants by UPLC-QToF-MS: The in Vitro Metabolism of Triclosan in Horseradish
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DOI：
10.1021/jf404784q
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发表时间：
2014-02-05
影响因子：
6.1
通讯作者：
Reemtsma, Thorsten
中科院分区：
文献类型：
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作者：
Macherius, Andre;Seiwert, Bettina;Reemtsma, Thorsten
植物吸收污染物后，可通过I相和II相代谢将其转化为多种多样的产物。采用UPLC-QToF-MS检测和鉴定辣根毛状根培养物中抑菌剂三氯生的代谢产物。三氯生的33种代谢产物通过质量缺陷过滤、多变量数据分析和同位素模式过滤的逐步方法从暴露培养物中数千个信号的数据集中识别。根据其MS数据，详细阐述了23种三氯生代谢物的结构建议。大多数被鉴定为结合物（II相代谢物），如α-内酰胺或磺酰内酰胺。此外，还首次鉴定了一种二磺基糖作为植物代谢产物。除此之外，还在辣根组织提取物中测定了I相代谢产物羟基三氯生的结合物。未观察到三氯生的脱卤产物。在这项研究中检测和鉴定的大量代谢物强调了在植物中有机污染物的吸收和归宿研究中采用综合分析方法的重要性。
Plants can extensively transform contaminants after uptake through phase I and phase II metabolism to a large diversity of products. UPLC-QToF-MS was used to detect and identify metabolites of the bacteriostatic agent triclosan in a horseradish hairy root culture. Thirty-three metabolites of triclosan were recognized by a stepwise approach of mass defect filtering, multivariate data analysis, and isotope pattern filtering from a data set of several thousands of signals in the exposed culture. Structure proposals were elaborated for 23 triclosan metabolites on the basis of their MS data. The majority were identified as conjugates (phase II metabolites) such as saccharides or sulfosaccharides. Additionally, a disulfosaccharide was identified as a plant metabolite for the first time. Besides that, also conjugates of a phase I metabolite, hydroxytriclosan, were determined in horseradish tissue extracts. Dehalogenation products of triclosan were not observed. The large number of metabolites detected and identified in this study emphasizes the importance of a comprehensive analytical approach in studies on the uptake and fate of organic contaminants in plants.