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49 2010

Journal of Food and Nutrition Research
Súhrny čísla 2 / 2010

JESENÁK, K. – ŠALAMUNOVÁ, Ľ. – KUCHTA, T.
Eradication of Listeria from water suspensions using octadecylammonium derivatives of montmorillonite
Journal of Food and Nutrition Research, 49, 2010, č. 2, s. 85-88

Karol Jesenák, Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, Mlynská dolina Ch-2, SK – 842 15 Bratislava, Slovakia. E-mail: jesenak@fns.uniba.sk

Súhrn: 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•ml-1 at a bacterial suspension density of 104 CFU•ml-1, and I50 < 0.01 mg•ml-1 at a bacterial suspension density of 103 CFU•ml-1. 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•ml-1 at a bacterial suspension density of 107 CFU•ml-1. 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•ml-1. Because this compound sediments in water, it may be a candidate for further study at microbiological decontamination of water in food processing environments.

Kľúčové slová: montmorillonite; octadecylammonium; Listeria

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