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10.1128_AEM.69.5.2563–2567.2003.pdf (478.22 kB)

Enhanced killing of Acanthamoeba cysts with a plant peroxidase-hydrogen peroxide-halide antimicrobial system

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posted on 2009-12-08, 16:06 authored by Reanne Hughes, Peter W. Andrew, Simon Kilvington
The activity of H[subscript 2]O[subscript 2] against the resistant cyst stage of the pathogenic free-living amoeba Acanthamoeba was enhanced by the addition of KI and either horseradish peroxidase or soybean peroxidase or, to a lesser degree, lactoperoxidase. This resulted in an increase in the cysticidal activity of 3% (wt/vol) H[subscript 2]O[subscript 2], and there was >3-log killing in 2 h, compared with the 6 h required for comparable results with the peroxide solution alone (P < 0.05). With 2% H[subscript 2]O[subscript 2], enhancement was observed at all time points (P < 0.05), and total killing of the cyst inoculum occurred at 4 h, compared with 6 h for the peroxide alone. The activity of sublethal 1% H[subscript 2]O[subscript 2] was enhanced to give 3-log killing after 8 h of exposure (P < 0.05). No enhancement was obtained when KCl or catalase was used as a substitute in the reaction mixtures. The H[subscript 2]O[subscript 2] was not neutralized in the enhanced system during the experiments. However, in the presence of a platinum disk used to neutralize H[subscript 2]O[subscript 2] in contact lens care systems, the enhanced 2% H[subscript 2]O[subscript 2] system gave 2.8-log killing after 6 h or total cyst killing by 8 h, and total neutralization of the H[subscript 2]O[subscript 2] occurred by 4 h. In contrast, 2% H[subscript 2]O[subscript 2] alone resulted in <0.8-log killing of cysts in the presence of the platinum disk due to rapid (<1 h) neutralization of the peroxide. Our observations could result in significant improvement in the efficacy of H[subscript 2]O[subscript 2] contact lens disinfection systems against Acanthamoeba cysts and prevention of acanthamoeba keratitis.

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Citation

Applied and Environmental Microbiology, 2003, 69 (5), pp.2563-2567

Version

  • VoR (Version of Record)

Published in

Applied and Environmental Microbiology

Publisher

American Society for Microbiology

issn

0099-2240

eissn

1098-5336

Copyright date

2013

Available date

2009-12-08

Publisher version

http://aem.asm.org/content/69/5/2563

Language

en

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