Gold nanoparticles as efficient antimicrobial agents for Escherichia coli and Salmonella typhi

Chemistry Central Journal

Enrique Lima¹  Roberto Guerra²  Víctor Lara²  Ariel Guzmán³ 

[1] Instituto de Investigaciones en Materiales, UNAM, Circuito exterior s/n, Cd. Universitaria, Del. Coyoacán, C.P. 04510, Distrito Federal, Mexico

[2] Universidad Autónoma Metropolitana, Iztapalapa, Av. San Rafael Atlixco No. 186, Col. Vicentina, CP 09340, México DF, Mexico

[3] Instituto Politécnico Nacional, ESIQIE, Av. IPN UPALM Edif. 7, Zacatenco, 07738, México D.F, Mexico

关键词: Porous materials;    Microbial;    Zeolite;    Gold;   

Others  :  787981
DOI  :  10.1186/1752-153X-7-11

 received in 2012-10-29, accepted in 2013-01-15,  发布年份 2013

【 摘 要 】

Background

It is imperative to eliminate bacteria present in water in order to avoid problems in healthy. Escherichia coli and Salmonella typhi bacteria are two common pollutants and they are developing resistance to some of the most used bactericide. Therefore new biocide materials are being tested. Thus, gold nanoparticles are proposed to inhibit the growth of these two microorganisms.

Results

Gold nanoparticles were supported onto clinoptilolite, mordenite and faujasite zeolites. Content of gold in materials varied between 2.3 and 2.8 wt%. The size, dispersion and roughness of gold nanoparticles were highly dependent of the zeolite support. The faujasite support was the support where the 5 nm nanoparticles were highly dispersed. The efficiency of gold-zeolites as bactericides of Escherichia coli and Salmonella typhi was determined by the zeolite support.

Conclusions

Gold nanoparticles dispersed on zeolites eliminate Escherichia coli and Salmonella typhi at short times. The biocidal properties of gold nanoparticles are influenced by the type of support which, indeed, drives key parameters as the size and roughness of nanoparticles. The more actives materials were pointed out Au-faujasite. These materials contained particles sized 5 nm at surface and eliminate 90–95% of Escherichia coli and Salmonella typhi colonies.

【 授权许可】

   
2013 Lima et al.; licensee Chemistry Central Ltd.

【 图 表 】

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