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Kazimirova K. O., Khabibullin V. R., Reshetnikova I. S., Egunova O. R., Shtykov S. N. Preconcentration of Е110 and Е124 Food Azodyes on Magnetite Nanoparticles Modified by CTAB. Izvestiya of Saratov University. Chemistry. Biology. Ecology, 2017, vol. 17, iss. 2, pp. 138-142. DOI:

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Preconcentration of Е110 and Е124 Food Azodyes on Magnetite Nanoparticles Modified by CTAB


Synthetic azodyes are widely used in paint, textile, plastic, and food, beverage, and leather, cosmetic, pharmaceutical and paper industries to make products more visually attractive to consumers. Therefore, they are also the components of waste waters and should be removed due to their potential risk to human health. Many techniques have been employed to eliminate dyes from waste water and do to preconcen- tration before analysis in food or beverage objects. One of the most popular and effective is magnetic solid-phase extraction (MSPE) with the use of magnetic nanoparticles (MNP). The aim of this work was the synthesis of magnetite nanoparticles, their modification and application to sorption and preconcentration of two widely used food azodyes E110 and E124. Superparamagnetic magnetite MNP were synthesized by co-precipitation of Fe(III) and Fe(II) 2:1 salts and then their surface was modified with cetyltrimethylammonium bromide (CTAB) to improve the stability of MNP and their adsorption properties with respect to azodyes containing sulphonic groups. The effect of various experimental factors: the pH of solution, the influence of concentration, the contact time and the quantity of the MNP sample were studied by using the batch technique. The characterization of the shape, charge, size of MNP and surface modification was performed by dynamic light scattering (DLS), transmittance electron microscopy (TEM) and XRD methods. It was established that the sizes of all MNP modified by CTAB were varied between 8±2 nm with the shell thickness about 1.0±0.1 nm. It was found that positive zeta-potential of modified MNP was at pH 3–6 and the highest extent of sorption (95–99%) of the both azodyes was at pH 5, 3.2 mg of MNP within dyes concentration in water less than 1.10-5 M. 


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