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Title

Electrophoretic characterization of insulin growth factor (IGF-1) functionalized magnetic nanoparticles

AuthorsViota, Julián L.; Rudzka, Katarzyna; Trueba Saiz, Ángel; Torres Alemán, Ignacio ; Delgado, A. V.
Issue Date2011
PublisherAmerican Chemical Society
CitationLangmuir : the ACS journal of surfaces and colloids 27: 6426- 6432 (2011)
AbstractThe synthesis of composite nanoparticles consisting of a magnetite core coated with a layer of the hormone insulin growth factor 1 (IGF-1) is described. The adsorption of the hormone in the different formulations is first studied by electrophoretic mobility measurements as a function of pH, ionic strength, and time. Because of the permeable character expected for both citrate and IGF-1 coatings surrounding the magnetite cores, an appropriate analysis of their electrophoretic mobility must be addressed. Recent developments of electrokinetic theories for particles covered by soft surface layers have rendered possible the evaluation of the softness degree from raw electrophoretic mobility data. In the present contribution, the data are quantitatively analyzed based on the theoretical model of the electrokinetics of soft particles. As a result, information is obtained on both the thickness and the charge density of the surrounding layer. It is shown that IGF-1 adsorbs onto the surface of citrate-coated magnetite nanoparticles, and adsorption is confirmed by dot-blot analysis. In addition, it is also demonstrated that the external layer of IGF-1 exerts a shielding effect on the surface charge of citrate-magnetite particles, as suggested by the mobility reduction upon contacting the particles with the hormone. Aging effects are demonstrated, providing an electrokinetic fingerprint of changes in adsorbed protein configuration with time. © 2011 American Chemical Society.
URIhttp://hdl.handle.net/10261/61090
DOI10.1021/la2009144
Identifiersdoi: 10.1021/la2009144
issn: 0743-7463
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