Adsorption of chiral aromatic amino acids onto carboxymethyl-β-cyclodextrin bonded Fe3O4/SiO2 core-shell nanoparticles
Adsorption of chiral aromatic amino acids onto carboxymethyl-β-cyclodextrin bonded Fe3O4/SiO2 core-shell nanoparticles
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DOI：
10.1016/j.jcis.2010.11.060
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发表时间：
2011-02-15
影响因子：
9.9
通讯作者：
Hidajat, K.
中科院分区：
文献类型：
--
作者：
Ghosh, Sudipa;Badruddoza, A. Z. M.;Hidajat, K.
采用碳二亚胺活化法在磁性二氧化硅纳米粒子表面接枝羧甲基-β-环糊精（CM-beta-CD）。利用透射电子显微镜（TEM）、傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）、X射线光电子能谱（XPS）和振动样品磁强计（VSM）对磁性核壳纳米粒子（MNP）进行了表征。这些纳米尺寸的颗粒被仔细检查用于从磷酸盐缓冲溶液中吸附某些手性芳香族氨基酸对映体，即D-和L-色氨酸（Trp）、D-和L-苯丙氨酸（Phe）以及D-和L-酪氨酸（Tyr）。包覆磁性纳米粒子对氨基酸对映体的吸附量大小顺序为：L-Trp > L-Phe > L-Tyr，在相同条件下，对L-对映体的吸附量大于相应的D-对映体。吸附等温线均符合Freundlich模型。FTIR研究描绘了氨基酸吸附到纳米颗粒上后的显著变化。氨基酸分子的N-H键的伸缩振动频率随着主客体相互作用形成复合物而改变。氨基酸分子的结构和疏水性决定了氨基酸分子与环糊精纳米吸附剂之间的相互作用，从而决定了它们吸附行为的差异。(C)2010年爱思唯尔公司All rights reserved.
Surface of magnetic silica nanoparticles is modified by grafting with carboxymethyl-beta-cyclodextrin (CM-beta-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. (C) 2010 Elsevier Inc. All rights reserved.