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Abstract

Separations of bare superparamagnetic magnetite nanoparticles (BSPMNPs, approx. 11 nm diameter) was performed using non-complexing (nitrate) and complexing (chloride, citrate and phosphate) electrolyte ions with additions of tetramethylammonium hydroxide (TMAOH), which is commonly applied to control the synthesis of stable iron oxides. The use of TMAOH as a background electrolyte (BGE) additive for capillary electrophoresis (CE) separations provided for the first time electropherograms of BSPMNPs exhibiting symmetrical and highly reproducible peaks, free of spurious spikes characteristic of nanoparticle clusters. Consequently, accurate determination of the electrophoretic effective mobility of BSPMNPs was possible, yielding a value of -3.345E-08 m2 V-1 s-1 (relative standard deviation (RSD) of 0.500%). The obtained mobilities of BSPMNPs in the presence of various electrolyte ions show that the degree of complexation with the surface of BSPMNPs follows the order chloride < citrate < phosphate, correlating with the stabilities of Fe(III) complexes with the respective anions. Finally, bare and carboxylated iron oxide nanoparticles were successfully separated in only 10 min using 10 mM Tris-nitrate containing 20 mM of TMAOH as electrolyte. Our findings show that simple and rapid CE experiments are an excellent tool to characterise and monitor properties and interactions of iron oxide nanoparticles with other molecules for surface modification purposes.

Item Type:	Article
Authors/Creators:	Alves, MN and Nesterenko, PN and Paull, B and Haddad, PR and Macka, M
Keywords:	background electrolyte, capillary electrophoresis, complexation, magnetite nanoparticles, tetramethylammonium hydroxide, capillary zone electrophoresis
Journal or Publication Title:	Electrophoresis
Publisher:	Wiley-V C H Verlag Gmbh
ISSN:	0173-0835
DOI / ID Number:	10.1002/elps.201800095
Copyright Information:	2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Related URLs:	Google Scholar: Nesterenko, PN UTAS Profile: Nesterenko, PN Google Scholar: Paull, B UTAS Profile: Paull, B UTAS Profile: Haddad, PR Google Scholar: Macka, M UTAS Profile: Macka, M
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