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Issue 13, 2015
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Preparation and application of magnetic graphene oxide coated with a modified chitosan pH-sensitive hydrogel: an efficient biocompatible adsorbent for catechin

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Abstract

In the present study, graft copolymerization of acrylic acid sodium salt (AAS) onto O-carboxymethyl chitosan (O-CMCs) produced a highly hydrophilic and pH-sensitive hydrogel polymer of O-CMCs-g-AAS with a porous surface morphology. The grafted chitosan copolymer was coated on magnetic graphene oxide (MGO) and characterized with TEM, SEM, and FT-IR techniques. The prepared nanocomposite, [O-CMCs-g-AAS]/MGO, was successfully used as an efficient and biocompatible adsorbent in magnetic solid phase extraction (MSPE) coupled with gas chromatography-mass spectrometry (GC-MS) for preconcentration and determination of catechin in tea beverages. The influence of the main parameters affecting the quality of the coating process was investigated and optimized using a response surface methodology. Under the optimum conditions, the adsorbent demonstrated a satisfactory adsorption capacity (27 mg g−1) for catechin and good linearity in the range of 0.005–5 μg mL−1 with a determination coefficient (R2) of 0.9987. The limit of detection (LOD) and limit of quantification (LOQ) were 0.001 and 0.003 μg mL−1, respectively. The relative standard deviation (RSD) was 4.1% (n = 5, C = 0.5 μg mL−1).

Graphical abstract: Preparation and application of magnetic graphene oxide coated with a modified chitosan pH-sensitive hydrogel: an efficient biocompatible adsorbent for catechin

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Article information


Submitted
30 Sep 2014
Accepted
09 Dec 2014
First published
10 Dec 2014

RSC Adv., 2015,5, 9396-9404
Article type
Paper
Author version available

Preparation and application of magnetic graphene oxide coated with a modified chitosan pH-sensitive hydrogel: an efficient biocompatible adsorbent for catechin

H. Sereshti, S. Samadi, S. Asgari and M. Karimi, RSC Adv., 2015, 5, 9396
DOI: 10.1039/C4RA11572D

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