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Researchers from Chulalongkorn University Report Findings in Escherichia Coli (Silver ions and silver nanoparticles in zeolite A composites for...

September 9, 2014



Researchers from Chulalongkorn University Report Findings in Escherichia Coli (Silver ions and silver nanoparticles in zeolite A composites for antibacterial activity)

By a News Reporter-Staff News Editor at Life Science Weekly -- Research findings on Proteobacteria are discussed in a new report. According to news reporting originating in Bangkok, Thailand, by NewsRx journalists, research stated, "The modification of zeolite A (NaA) by impregnation with different concentrations of silver ions (Ag+) or silver nanopartides (AgNPs) for antibacterial activity was investigated. The Ag+-NaA composites were prepared by ion exchange against different concentrations of silver nitrate solution (25-200 mg/L) while AgNPs were subsequently prepared by reducing the impregnated Ag+ with sodium borohydride."

The news reporters obtained a quote from the research from Chulalongkorn University, "The addition of Ag+ and AgNPs had no discernible effect on the NaA structure. The AgNPs in the AgNP-NaA composites exhibited a typical broad absorption peak at 394 nm that was absent in the Ag+-NaA composites. The Ag+-NaA and AgNP-NaA composites both showed a dose- and time-dependent antimicrobial activity against the Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli bacteria, but were substantially more effective against E. coli than S. aureus."

According to the news reporters, the research concluded: "Moreover, Ag+-NaA composites had a substantially higher antibacterial efficiency against E. coli than the AgNP-NaA composites, whereas the highest concentration at 3 h, the AgNP-NaA composites were weakly more effective than the Ag+-NaA composites against S. aureus."

For more information on this research see: Silver ions and silver nanoparticles in zeolite A composites for antibacterial activity. Powder Technology, 2014;264():418-422. Powder Technology can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier - www.elsevier.com; Powder Technology - www.elsevier.com/wps/product/cws_home/504094)

Our news correspondents report that additional information may be obtained by contacting D. Jiraroj, Chulalongkorn University, Fac Sci, Dept. of Chem, Bangkok 10330, Thailand. Additional authors for this research include S. Tungasmita and D.N. Tungasmita (see also Proteobacteria).

Keywords for this news article include: Bangkok, Thailand, Asia, Emerging Technologies, Enterobacteriaceae, Escherichia, Gammaproteobacteria, Nanoparticle, Nanotechnology

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Life Science Weekly


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