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Issue 7, 2009
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Light and dark biocidal activity of cationic poly(arylene ethynylene) conjugated polyelectrolytes

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Abstract

In this paper we report a study of cationic poly(arylene ethynylene) conjugated polyelectrolytes. The objective of the study was to compare the behavior of a polymer where a thiophene has replaced a phenyl ring in poly(phenylene ethynylene) polycations (PPE) previously investigated. Properties of solution phase and physisorbed suspensions of the polymer on microspheres were investigated. The photophysical properties of the polymer are evaluated and used to understand the striking differences in biocidal activity compared to the PPE polymers previously examined. The principal findings are that the thiophene polymer has remarkable dark biocidal activity against Pseudomonas aeruginosa strain PAO1 but very little light-activated activity. The low light-activated biocidal activity of the thiophene polymer is attributed to a highly aggregated state of the polymer in aqueous solutions and on microspheres as a physisorbed coating. This results in low triplet yields and a very poor sensitization of singlet oxygen and other reactive oxygen intermediates. The highly effective dark biocidal activity of the thiophene-containing polymers is attributed to its high lipophilicity and the presence of accessible quaternary ammonium groups. The difference in behavior among the polymers compared provides insights into the mechanism of the dark process and indicates that aggregation of polymer can reduce light activated biocidal activity by suppressing singlet oxygen generation.

Graphical abstract: Light and dark biocidal activity of cationic poly(arylene ethynylene) conjugated polyelectrolytes

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Publication details

The article was received on 09 Feb 2009, accepted on 26 May 2009 and first published on 08 Jun 2009


Article type: Paper
DOI: 10.1039/B902646K
Citation: Photochem. Photobiol. Sci., 2009,8, 998-1005
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    Light and dark biocidal activity of cationic poly(arylene ethynylene) conjugated polyelectrolytes

    T. S. Corbitt, L. Ding, E. Ji, L. K. Ista, K. Ogawa, G. P. Lopez, K. S. Schanze and D. G. Whitten, Photochem. Photobiol. Sci., 2009, 8, 998
    DOI: 10.1039/B902646K

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