Journal
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
Volume 92, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jfca.2020.103511
Keywords
Electrochemical sensor; Multi-walled carbon nanotubes; Silsesquioxane; Folic acid; Wheat flour; Fortified flour
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Funding
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brazil (CAPES) [001]
- Brazilian government agency Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [446757/2014-4]
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Folic acid (FA) acts as an essential nutrient for body functions. Several countries have already proposed a resolution for flour fortification with iron and FA; thus, of food industry concern. Therefore, a new electroanalytical method based on a composite material of functionalized MWCNTs with nickel hydroxide (f-MWCNT-Ni(OH)(2)) is hereby proposed. This composite material was characterized by FT-IR, TGA, SEM and TEM techniques. An inorganic ionic silsesquioxane polymer (Si(4)Pic(+) Cl-) was used to disperse the composite and applied on the modification of a glassy carbon electrode (GCE). Linear response from 0.5-26 mu mol L-1- was obtained based on FA electrochemical oxidation through differential pulse voltammetry. The LoD and LoQ values obtained were 0.095 mu mol L-1 and 0.3 mu mol L-1 of FA, respectively. The GCE/f-MWCNT-Ni(OH)(2)-Si(4)Pic(+)Cl(-) was applied for the quantification of FA in wheat flour, fortifier, and dietary supplement. Validation was performed through a comparison with molecular absorption spectrometry, showing the accuracy of the newly proposed method.
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