期刊
CARBOHYDRATE POLYMERS
卷 89, 期 4, 页码 1159-1165出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2012.03.089
关键词
Silver nanoparticles; Dextran; Particle size; Antimicrobial activity
资金
- UGC, Govt. of India
- DST, Govt. of India under INSPIRE
- CSIR, Govt. of India
- UGC, Govt. of India for his fellowship under Rajiv Gandhi National Fellowship (RGNF) scheme
A simple one-step rapid synthetic route is described for the preparation of silver nanoparticles by reduction of silver nitrate (AgNO3) using aqueous dextran solution which acts as both reducing and capping agent. The formation of silver nanoparticles is assured by characterization with UV-vis spectroscopy, atomic force microscopy (AFM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The absorbance of the silver nanoparticles is observed at 423 nm. The AFM image clearly shows the surface morphology of the well-dispersed silver nanoparticles with size range of 10-60 nm. TEM images show that the nanoparticles are spherical in shape with similar to 5-10 nm dimensions. The crystallinity of Ag nanoparticles is assured by XRD analysis. The antimicrobial activity of as synthesized silver nanoparticles is tested against the bacteria, Bacillus subtilis, Bacillus cereus, Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa. The bacterial growth is inhibited by gradual reduction of the concentration of the silver nanoparticles. (C) 2012 Elsevier Ltd. All rights reserved.
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