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Food Chem. 2018 Jan 15;239:911-919. doi: 10.1016/j.foodchem.2017.07.013. Epub 2017 Jul 8.

A novel magnetic β-cyclodextrin modified graphene oxide adsorbent with high recognition capability for 5 plant growth regulators.

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College of Pharmacy, Chongqing Medical University, Chongqing 400016, China.
The Inspection Technical Center of Chongqing Entry-Exit Inspection & Quarantine Bureau, Chongqing 400020, China.
College of Pharmacy, Chongqing Medical University, Chongqing 400016, China. Electronic address:


β-Cyclodextrin (β-CD) modified magnetic graphene oxide material (Fe3O4@SiO2/GO/β-CD), a novel magnetic sorbent for enrichment and purification of plant growth regulators (PGRs) in vegetables prior to gas chromatograph mass spectrometer (GC-MS) detection, was successfully fabricated. The novel magnetic sorbent geometrically fitted to selectively recognize and enrich PGR analytes especially containing aromatic structure. The selectivity experiment demonstrated the higher selectivity of Fe3O4@SiO2/GO/β-CD toward 5 PGR compounds than that of Fe3O4@SiO2/GO. Several parameters affecting extraction efficiency including the volume of extraction solvent, amount of adsorbent, extraction time, type and the volume of desorption solvent were optimized. Under the optimized condition, good linear relationships were obtained in the range of 1-100μg/kg with determination coefficients (R2) from 0.9983 to 0.9996. The limits of detection (LODs) of 5 PGRs were from 0.04 to 0.28μg/kg. The proposed method had good potential for the analysis of trace level of 5 PGRs in real vegetable samples.


Magnetic graphene oxide; Magnetic solid phase extraction; Plant growth regulators; β-Cyclodextrin

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