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Title: Adsorption of chiral aromatic amino acids onto carboxymethyl-β-cyclodextrin bonded Fe3O4/SiO2 core-shell nanoparticles
Authors: Ghosh, S.
Badruddoza, A.Z.M.
Uddin, M.S. 
Hidajat, K. 
Keywords: Adsorption
Amino acids
Magnetic nanoparticles
Surface functionalization
Issue Date: 15-Feb-2011
Citation: Ghosh, S., Badruddoza, A.Z.M., Uddin, M.S., Hidajat, K. (2011-02-15). Adsorption of chiral aromatic amino acids onto carboxymethyl-β-cyclodextrin bonded Fe3O4/SiO2 core-shell nanoparticles. Journal of Colloid and Interface Science 354 (2) : 483-492. ScholarBank@NUS Repository.
Abstract: Surface of magnetic silica nanoparticles is modified by grafting with carboxymethyl-β-cyclodextrin (CM-β-CD) via carbodiimide activation. The functionalized magnetic core-shell nanoparticles (MNPs) are characterized by Transmission Electron Microscopy (TEM), Fourier Transform Infra Red (FTIR) spectroscopy, X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS) and Vibrating Sample Magnetometer (VSM). These nano-sized particles are scrutinized for adsorption of certain chiral aromatic amino acid enantiomers namely, d- and l-tryptophan (Trp), d- and l-phenylalanine (Phe) and d- and l-tyrosine (Tyr) from phosphate buffer solutions. Adsorption capacities of the coated magnetic nanoparticles toward amino acid enantiomers are in the order: l-Trp > l-Phe > l-Tyr and under the same condition, adsorption capacities are higher for l-enantiomers than the corresponding d-enantiomers. All the equilibrium adsorption isotherms are fitted well to Freundlich model. FTIR studies depict significant changes after adsorption of amino acids onto nanoparticles. The stretching vibration frequencies of N. H bonds of the amino acid molecules are changed with complex formation through host-guest interaction. The structure and hydrophobicity of amino acid molecules emphasize the interactions between amino acid molecules and the nano-adsorbents bearing cyclodextrin, thus play important roles in the difference of their adsorption behaviors. © 2010 Elsevier Inc.
Source Title: Journal of Colloid and Interface Science
ISSN: 00219797
DOI: 10.1016/j.jcis.2010.11.060
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