标题：Preparation of magnetic and fluorescent bifunctional chitosan nanoparticles for optical determination of copper ion
作者：Liu, L(Liu, Li); Xiao, L(Xiao, Ling); Zhu, HY(Zhu, Huayue); Shi, XW(Shi, Xiaowen)
来源出版物：MICROCHIMICA ACTA 卷：178 期：3-4 页：413-419 出版年：SEP 2012
摘要：We describe a simple method for the synthesis of highly magnetic and fluorescent bifunctional chitosan nanoparticles (MF-CSNPs). Water-soluble and magnetic Fe3O4-chitosan nanoparticles and CdSe quantum dots capped with thioglycolic acid were incorporated into a chitosan matrix via electrostatic interaction. The optical, magnetic, crystallographic and morphological properties of the new nanoparticles were studied by UV-visible, fluorescence, X-ray diffraction and transmission electron microscopy. In addition, MF-CSNPs are found to be a useful probe for the determination of copper ion which acts as a quencher of fluorescence. The relative fluorescence intensity of MF-CSNPs is linearly related to the concentration of copper ion in the 0.125 to 25 ng center dot mL(-1) concentration range. The MF-CSNPs also are found to adsorb copper ion which therefore can be separated and enriched by manipulating them with an external magnetic field. Before enrichment, the limit of detection (LOD) for copper ion is 120 pg center dot mL(-1), but after enrichment, the LOD is 46 pg center dot mL(-1).
作者关键词：Magnetic and fluorescent bifunctional nanoparticles, Quantum dots, Magnetic, Chitosan, Copper ion, Ion probe
扩展关键词：QUANTUM DOTS; SILICA SPHERES; PROBE; DELIVERY; NANOCRYSTALS; RED; DNA
通讯作者地址：Xiao, L (通讯作者),Wuhan Univ, Coll Resource & Environm Sci, Hubei Biomass Resource Chem & Environm Biotechnol, Wuhan 430072, Peoples R China.
[Liu, Li; Xiao, Ling; Zhu, Huayue; Shi, Xiaowen] Wuhan Univ, Coll Resource & Environm Sci, Hubei Biomass Resource Chem & Environm Biotechnol, Wuhan 430072, Peoples R China
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