Antibacterial evaluation of cotton textile treated by trialkoxysilane compounds with antimicrobial moiety

Abstract

Compounds based upon aldehyde functionalities or long chain quaternary ammonium functionalities constitute two major classes of antimicrobial materials. The antibacterial activities of these two classes of compounds were evaluated in the unbound (free compound) aqueous suspension and in the bound surface-treated cotton textile against E. coli. After a one hour incubation, the minimum lethal concentration of AEM 5700, a commercially available quaternary ammonium functional silane from Aegis Environments, was found to be 84 μg/g in the deionized water. The salinity of the test media significantly affected the antibacterial activity of AEM 5700 free compound. The minimum lethal concentration was increased to 8000 μg/g in the artificial seawater. Inactivation against E. coli of either free butyraldehyde or undecanylaldehyde functional triethoxysilylane in the deionized water was not observed. Cotton textile treated with various concentrations of AEM 5700 showed a two-stage antibacterial behavior when immersed in the deionized water. The higher activity in the first stage was due to the combined action of the leachate and the surface-bound AEM 5700, whereas the activity in the second-stage was caused by the contact between the surface-bound AEM 5700 and E. coli. This analysis was confirmed when the AEM 5700 treated cotton textile was tested in the artificial seawater. The leachate in the artificial seawater had no activity. The first-stage antibacterial behavior was not observed. Only the contact between the surface-bound AEM 5700 and E. coli contributed to about a one log reduction plateau with time. For cotton textile treated by either of the examined trialkoxysilylaldehyde compounds, inactivation against E. coli was not found.

Keywords

Antibacterial activities surface-bound biocide trialkoxysilyl compound

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