Journal
FOOD CHEMISTRY
Volume 139, Issue 1-4, Pages 1001-1007Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2013.01.035
Keywords
Electrochemical sensor; Molecular imprinting; Core-shell nanoparticles; TBHQ monitoring
Funding
- NSFC [21033005, 21273134]
- National Basic Research Program of China (973 Program) [2009CB930103]
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One novel electrochemistry-molecular imprinting sensor for determining tert-butylhydroquinone (TBHQ) in foodstuff was developed. TBHQ-imprinted core-shell nanoparticles (TICSNs) were fabricated using silica nanoparticles as core material. The silica nanoparticles were modified with (3-chloropropyl) trimethoxysilan and polyethylenimine, respectively, and polymerised to form the TICSNs with ethylene glycol dimethacrylate as cross-linker. The specific core-shell structure demonstrates extremely high specific surface area which greatly increases the effective binding sites and improves the recognition capability for model molecules. Under the optimal conditions, the linear range of the calibration curve was 0.1-50.0 mg kg(-1) with the detection limit of 0.27 mg kg(-1). The sensor has been successfully applied to the determination of TBHQ in food samples and achieved high sensitivity and selectivity. (C) 2013 Elsevier Ltd. All rights reserved.
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