Green synthesis of finely-dispersed highly bactericidal silver nanoparticles via modified Tollens technique

다국어 초록 (Multilingual Abstract)

In this article, we represent a versatile and effective technique which using non-toxic chemicals to prepare stable aqueous dispersions of silver nanoparticles (NPs) via modified Tollens process. It was shown that as-prepared silver colloids consisted of finely-dispersed NPs with average diameter about 10 nm and a relatively narrow size distribution. Moreover, they could be stored very stable after several months without observation of aggregates or sedimentation. In comparison with previous works where Tollens process was being used, we for the first time applied UV-irradiation simultaneously with glucose reduction of silver salt through NPs preparation. The colloidal solutions of silver NPs were found to exhibit a high antibacterial activity against gram-negative Escherichia coli. The concentration of silver leading to a complete inhibition of bacteria growth was revealed as low as at 1.0 ㎍ml-1 and found much lower compared to earlier reports. These advantages of aqueous dispersions of silver NPs make them ideal for green industrial, medicinal, microbiological and other applications.

참고문헌 (Reference)

1 G.K. Vertelov, 19 : 355707-, 2008

2 J.R. Morones, "The bactericidal effect of silver nanoparticles" 16 : 2346-, 2005

3 D. Kim, "Synthesis of silver nanoparticles using polyol process and the influence of precursor injection" 17 : 4019-, 2006

4 J. Park, "Synthesis of monodisperse spherical nanocrystals" 46 : 4630-, 2007

5 Y.A. Krutyakov, "Synthesis and properties of silver nanoparticles: advances and prospects" 77 : 233-, 2008

6 Y. Yin, "Synthesis and characterization of stable aqueous dispersions of silver nanoparticles though the Tollens process" 12 : 522-, 2002

7 S.K. Ghosh, "Studies on the evolution of silver nanoparticles in micelle by UV-photoactivation" 5 : 577-587, 2003

8 I. Sondi, "Silver nanoparticles as antimicrobial agent: a case study of E. coli as a model for gram-negative bacteria" 275 : 177-182, 2004

9 A. Panacˇek, "Silver colloid nanoparticles: synthesis, characterization, and their antibacterial activity" B 110 : 2006

10 Y. Sun, "Shape-controlled synthesis of gold and silver nanoparticles" 298 : 2176-, 2002

11 Q. Zhang, "Reconstruction of silver nanoplates by UV irradiation: tailored optical properties and enhanced stability" 48 : 3516-, 2009

12 L. Qu, "Novel silver nanostructures from silver mirror reaction on reactive substrates" B 109 : 13985-, 2005

13 M. Sakamoto, "Light as construction tool of metal nanoparticles: synthesis and mechanism" 10 : 33-56, 2009

14 W. Yang, "Food storage materialsilver nanoparticles interfere with DNA replication fidelity and bind with DNA" 20 : 085102-, 2009

15 K.J. Lee, "Environmentally friendly synthesis of organic-soluble silver nanoparticles for printed electronics" 18 : 335601-, 2007

16 L. Kvítek, "Effect of surfactants and polymers on stability and antibacterial activity of silver nanoparticles" C 112 : 5825-, 2008

17 C. Chen, "Chemical preparation of special-shaped metal nanomaterials though encapsulation or inducement in soft solution" 1 : 1-, 2006

18 S. Shrivastava, "Characterization of enhanced antibacterial effects of novel silver nanoparticles" 18 : 225103-, 2007

19 M. Raffi, "Antibacterial characterization of silver nanoparticles against E. coli ATCC- 15224" 24 : 192-196, 2008

20 S. Singh, "A direct method for the preparation of glycolipid-metal nanoparticle conjugates: sophorolipids as reducing and capping agents for the synthesis of water redispersible silver nanoparticles and their antibacterial activity" 33 : 646-652, 2009