Eradication of Listeria from water suspensions using octadecylammonium derivatives of montmorillonite
2010
Jesenák, K., Comenius Univ., Bratislava (Slovak Republic) | Šalamunová, Ľ., Comenius Univ., Bratislava (Slovak Republic) | Kuchta, T., Comenius Univ., Bratislava (Slovak Republic)
A series of octadecylammonium derivatives of montmorillonite (ODM) with different contents of the organic matter were prepared, characterized and tested at eradication of Listeria innocua from water suspensions. ODM containing octadecylammonium at 100% of the ion-exchange capacity of montmorillonite exhibited a high efficiency of eradication of L. innocua from water suspensions during a contact time of 10 min, with I50 = 0.03 mg per ml at a bacterial suspension density of 10 sup(4) CFU per ml, and I50 less than 0.01 mg per ml at a bacterial suspension density of 10 sup(3) CFU per ml. The compound was effective also at devitalization of L. innocua in water suspensions during a contact time of 12 h, with minimum inhibitory concentration of 0.1 mg per ml at a bacterial suspension density of 10 sup(7) CFU per ml. Montmorillonite modified with octadecylammonium at 20% of the ion-exchange capacity exhibited an efficiency of eradication of L. innocua from water suspensions during a contact time of 10 min at I50 of 3 mg per ml. Because this compound sediments in water, it may be a candidate for further study at microbiological decontamination of water in food processing environments.
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