Multiplex On-Bead Isotope Dimethyl Labeling Coupled with Liquid Chromatography-High-Resolution Mass Spectrometry for Quantitative Analysis of Sulfonamides in Estuarine Ice

Analytical Chemistry
Minghuo WuJingjing Zhan

Abstract

A multiplex-on-bead-isotope-dimethyl-labeling method was developed for the quantitative analysis of sulfonamides (SAs) in environmental water samples by liquid chromatography-high-resolution mass spectrometry (LC-HRMS). In this method, five samples could be labeled in parallel with different isotope reagents and quantified in a single LC-HRMS analysis. Magnetic solid-phase extraction (MSPE) was employed in the sample preparation to concentrate the trace-level analytes by using lab-synthesized magnetic carbon nanospheres (MCNSs). After the analytes were captured on the MCNSs, the isotope labeling was performed directly by dispersing the MCNSs in the reaction buffer (on-bead labeling). The experimental conditions for MSPE and labeling were systematically investigated. For the tested 12 SAs, a labeling efficiency of over 99% could be achieved within 20 min. The LC-HRMS separation, including equilibration, could be achieved in 6 min. By combining MSPE (enriched 200-fold), multiplex on-bead dimethyl labeling, and LC-HRMS, all the tested SAs could be reliably quantified with limits of detection (LODs) of 0.1-5 ng/L. This method was verified using fortified pond water spiked with 12 SAs (0.01-5 μg/L), and accuracies of 81-106% were ac...Continue Reading

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Citations

Feb 12, 2020·Journal of Separation Science·Xintong XieGangfeng Ouyang
Apr 23, 2021·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Yuanchen LiuYusuke Yamauchi

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