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. 2021 Dec 7;26(24):7427.
doi: 10.3390/molecules26247427.

Magnetic Solid-Phase Extraction Based on Magnetic Sulfonated Reduced Graphene Oxide for HPLC-MS/MS Analysis of Illegal Basic Dyes in Foods

Shibo Cui  1 , Xinwu Mao  2 , Haijing Zhang  1 , Haowei Zeng  2 , Zihao Lin  2 , Xuewu Zhang  1   3 , Ping Qi  2
Affiliations

Magnetic Solid-Phase Extraction Based on Magnetic Sulfonated Reduced Graphene Oxide for HPLC-MS/MS Analysis of Illegal Basic Dyes in Foods

Shibo Cui et al. Molecules. .

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.

Keywords: HPLC–MS/MS; MSPE method; functionalized graphene oxide; illegal food dyes.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
The FTIR spectrum of GO, M-RGO, and M-S-RGO.
Figure 2
Figure 2
(a) XPS full-spectra of the M-RGO and M-S-RGO. (b) XPS spectrum of the C1s orbital in M-S-RGO. (c) XPS spectrum of the S2p orbital of the M-S-RGO.
Figure 3
Figure 3
(a) SEM image of GO. (b) SEM image of the M-S-RGO. (c) TEM images of GO. (d) TEM images of the M-S-RGO.
Figure 4
Figure 4
Effects of (a) pH and (b) extraction time on extraction efficiency of the M-S-RGO. (c) An adsorption isotherm curve of the M-S-RGO to the tested dyes. (d) An adsorption kinetic curve of the M-S-RGO to the tested dyes.
See this image and copyright information in PMC

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