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Title of Journal: Microchim Acta

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Abbravation: Microchimica Acta

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Springer Vienna

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DOI

10.1002/9781118467299.ch8

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ISSN

1436-5073

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Separation and purification of hydrophobic magneti

Authors: Ángela ÉcijaArenas Vanesa RománPizarro Juan Manuel FernándezRomero Agustina GómezHens
Publish Date: 2016/04/02
Volume: 183, Issue: 6, Pages: 2005-2012
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Abstract

The authors describe a multiphase density gradient centrifugation method for the separation and purification of hybrid nanoparticles NPs The method was applied to the purification of NPs consisting of magnetite gold NPs of type Fe3O4Au and coated with 1dodecylthiol A density gradient has been established by forming cushions of a multicomponent solution composed of a a nonlinear gradient of sucrose in the of 5–50  concentration range b a constant concentration of ficoll a neutral highly branched highmass hydrophilic polysaccharide 30  w/w and c a constant concentration of percoll colloidal silica particles coated with polyvinylpyrrolidone 15  w/w The final separation profiles are adjusted via dynamic differential centrifugation at 4480×g for 30 min The mixture of NPs to be separated is added and centrifuged at 2520×g for 40 min This will separate the NPs into five fractions together with other secondary components The fractions were characterized by FTIR XPS and SEMEDX techniques Finally a continuous flow system with resonance light scattering detection was established and coupled to the separation system in order to monitor the separated fractionsMultilayer density gradient centrifugation MDGC system coupled to a continuous flow system CFS equipped with a resonance light scattering detector RSLD AuNPs gold nanoparticles AuNPsC12SH 1dodecylthiol AuNPs Fe3O4NPs magnetic nanoparticles and Fe3O4AuNPs magneticgold nanoparticlesAuthors gratefully acknowledge financial support from the Spanish MICINN Ministerio de Ciencia e Innovación Grant No CTQ201232941/BQU and the FEDER program Authors also wish to acknowledge to the UCO Research Support Central Service UCO/SCAI for the availability of the supporting techniques for NPs characterization

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