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Comparative study of the microbidical activity of alcohols under the conditions of the European Suspension Test

Vergelijkend onderzoek naar de desinfecterende werking van alcoholen in de Europese Suspensie Test

Synopsis

To obtain quantitative data on the microbidical activity of ethanol, n-propanol and isopropanol under the conditions of the European Suspension Test, comparative tests were carried out in the concentration range of 20 to 80% v/v using the standard test organisms of this test methods (4 bacteria and 1 yeast) as well as a strain of Mycobacterium terrae and spores of Aspergillus niger. The results show that all alcohols rested are rapidly cidal against bacteria and yeasts, inducing the norm reduction of 5 log cycles within 2 minutes. Propanols, especially n-propanol, are slightly more active than ethanol, reaching the above reduction already at concentrations of 30% v/v. Spores of A.niger are less susceptible. At the usual concentration of 70% v/v only ethanol causes within 5 minutes the desired reduction of 5 log ; with n-propanol and isopropanol the reduction is limited to approximately 4 and 2 log reduction respectively.
 

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