Highly-sensitive electrochemical sensing platforms for food colourants based on the property-tuning of porous carbon

Analytica Chimica Acta
Qin ChengKangbing Wu

Abstract

It is very challenging to develop highly-sensitive analytical platforms for toxic synthetic colourants that widely added in food samples. Herein, a series of porous carbon (PC) was prepared using CaCO3 nanoparticles (nano-CaCO3) as the hard template and starch as the carbon precursor. Characterizations of scanning electron microscopy and transmission electron microscopy indicated that the morphology and porous structure were controlled by the weight ratio of starch and nano-CaCO3. The electrochemical behaviours of four kinds of widely-used food colourants, Sunset yellow, Tartrazine, Ponceau 4R and Allura red, were studied. On the surface of PC samples, the oxidation signals of colourants enhanced obviously, and more importantly, the signal enhancement abilities of PC were also dependent on the starch/nano-CaCO3 weight ratio. The greatly-increased electron transfer ability and accumulation efficiency were the main reason for the enhanced signals of colourants, as confirmed by electrochemical impedance spectroscopy and chronocoulometry. The prepared PC-2 sample by 1:1 starch/nano-CaCO3 weight ratio was more active for the oxidation of food colourtants, and increased the signals by 89.4-fold, 79.3-fold, 47.3-fold and 50.7-fold for...Continue Reading

References

Mar 25, 2010·Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association·Mohamed M HashemGihan Farag Asaad
Jul 7, 2011·Nutrition Reviews·Robin B Kanarek
Aug 7, 2012·Neurotherapeutics : the Journal of the American Society for Experimental NeuroTherapeutics·L Eugene ArnoldElizabeth Hurt
Jun 10, 2014·Journal of Colloid and Interface Science·Anaclet NsabimanaLiping Guo

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Citations

Dec 10, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Carla Alice CarabetPetre Rotaru

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