Journal
CARBOHYDRATE POLYMERS
Volume 117, Issue -, Pages 771-777Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2014.10.048
Keywords
Carboxylic curdlan; Gold nanoparticles; Green synthesis; Structure; Protein-nanoparticle interaction
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Funding
- Natural Science Foundation of Jiangsu Province [BK20140542]
- China Postdoctoral Science Foundation [2013M531292]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
- Jiangsu university students' scientific research project [13A097]
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This study demonstrates a facile, green strategy for the preparation of gold nanoparticles (AuNPs) from chloroauric acid (HAuCl4) using carboxylic curdlan (Cc) as both reducing and stabilizing agent. The as-prepared AuNPs are characterized by UV-vis spectroscopy, high resolution transmission electron microscopy, X-ray diffraction, energy dispersive X-ray spectrometry and Fourier transform infrared spectroscopy. The results indicated that the particle size of the AuNPs changes with variations in the reaction time and concentrations of Cc and HAuCl4. The spherical AuNPs are well dispersed, exhibiting high stability even after six months storage. The carboxylic groups (COO-) in the Cc molecules tend to adsorb and stabilize the surface of the AuNPs. The interaction between BSA and the Cc-capped AuNPs was investigated using fluorescence and circular dichroism spectroscopies. The results indicated that the BSA molecules adsorb on the surface of the AuNPs, without significant change in its helical structure even after conjugation with the AuNPs. (C) 2014 Elsevier Ltd. All rights reserved.
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