Magnetic Solid-Phase Extraction Based on Magnetic Sulfonated Reduced Graphene Oxide for HPLC–MS/MS Analysis of Illegal Basic Dyes in Foods |
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| Authors: | Shibo Cui Xinwu Mao Haijing Zhang Haowei Zeng Zihao Lin Xuewu Zhang Ping Qi |
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| Institution: | 1.College of Food Science and Engineering, South China University of Technology, Guangzhou 510641, China; (S.C.); (H.Z.);2.Guang Zhou Institute for Food Inspection, Guangzhou 511410, China; (X.M.); (H.Z.); (Z.L.);3.Guangzhou Institute of modern Industrial Technology, Guangzhou 511458, China |
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| Abstract: | In this study, a magnetic solid-phase extraction (MSPE) method coupled with High-Performance Liquid Chromatography Mass Spectrometry (HPLC–MS/MS) for the determination of illegal basic dyes in food samples was developed and validated. This method was based on Magnetic sulfonated reduced graphene oxide (M-S-RGO), which was sensitive and selective to analytes with structure of multiaromatic rings and negatively charged ions. Several factors affecting MSPE efficiency such as pH and adsorption time were optimized. Under the optimum conditions, the calibration curves exhibited good linearity, ranging from 5 to 60 µg/g with correlation coefficients >0.9950. The limits of detection of 16 basic dyes were in the range of 0.01–0.2 µg/L. The recoveries ranged from 70% to 110% with RSD% < 10%. The results indicate that M-S-RGO is an efficient and selective adsorbent for the extraction and cleanup of basic dyes. Due to the MSPE procedures, matrix effect and interference were eliminated in the analysis of HPLC–MS/MS without the matrix-matched standards. Thus, validation data showed that the proposed MSPE–HPLC–MS/MS method was rapid, efficient, selective, and sensitive for the determination of illegal basic dyes in foods. |
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| Keywords: | MSPE method functionalized graphene oxide HPLC– MS/MS illegal food dyes |
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