Thermosensitive-polymer-coated magnetic nanoparticles: Adsorption and desorption of Bovine Serum Albumin
Shamim, N. Hong, L. Hidajat, K. Uddin, M.S.
Shamim, N.
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Abstract
Adsorption and desorption behavior of Bovine Serum Albumin (BSA) on surface-modified magnetic nanoparticles covered with thermosensitive polymer (PNIPAM) was investigated as a function of temperature, pH, and ionic strength. Functionalization of surface-modified magnetic particles was performed by seed polymerization using N-isopropylacrylamide (PNIPAM) as the main monomer. Characterization of these particles was carried out using transmission electron micrography (TEM), and vibrating sample magnetometry (VSM). The adsorption results exhibited both pH and temperature sensitivity. The results showed that the temperature effect on adsorption/desorption behavior was mainly dependent on the properties of the particles' surface. The effect of pH was also investigated and it was observed that a smaller amount of protein was adsorbed at higher pH because of the electrostatic repulsive force between protein molecules and latex particles. The maximum amount of protein was adsorbed near the isoelectric point of BSA. Desorption results showed that more protein was desorbed when adsorption was done at lower temperatures and desorption efficiency was found to be higher than 80%. © 2006 Elsevier Inc. All rights reserved.
Keywords
Adsorption, Bovine Serum Albumin, Desorption, Isoelectric point, N-isopropylacrylamide, Thermosensitive magnetic particles
Source Title
Journal of Colloid and Interface Science
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Date
2006-12-01
DOI
10.1016/j.jcis.2006.08.047
Type
Article