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Open Access Antimicrobial action and efficiency of silver-loaded zeolite X

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Abstract Aims: 

To synthesize silver-loaded zeolite X and establish the extent to which it persist in its antimicrobial action against strains of Escherichia coli K12W-T, Pseudomonas aeruginosa NCIMB8295 and Staphylococcus aureus NCIMB6571. Methods and Results: 

The antimicrobial action and efficacy of silver-loaded zeolite X on Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa were investigated. Zeolite X was synthesized and loaded with Ag+ by ion exchange. This resulted in 2·0% (w/w) loading of Ag+ in the zeolite framework and 5·8% (w/w) on the zeolite. Escherichia coli and Pseudomonas aeruginosa and Staphylococcus aureus suspended in tryptone soya broth were exposed to 0·15, 0·25, 0·5 or 1·0 g l−1 of silver-loaded zeolite X for a period up to 24 h. No viable cells were detected for any of the three micro-organisms within 1 h. Silver-loaded zeolite X, retrieved three times from the first exposure cultures, was washed with de-ionized water and added to fresh bacterial suspensions. The results showed that the silver-loaded zeolite X retained its antimicrobial action. Conclusions: 

Silver-loaded zeolite X persisted in its antimicrobial action against all three micro-organisms. Significance and Impact of the study: 

The results are significant for the longevity of antimicrobial action of silver-loaded zeolite X.
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Keywords: Escherichia coli; Pseudomonas aeruginosa; Staphylococcus aureus; antimicrobial; efficiency; half-life; rate constant; silver-loaded zeolite X

Document Type: Research Article

Publication date: 01 May 2008

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