In vitro Effect of Quinolones on Hydrophobicity of Acinetobacter baumannii

České info

IN VITRO IN VITRO ÚČINOK CHINOLÓNOV NAHYDROFOBICITU ACINETOBACTER ACINETOBACTERBAUMANNII BAUMANNII

Testoval sa vplyv subinhibičných koncentrácií (sub-MICs) (1/4, 1/8, 1/16 a 1/32 MICs) štyrochchinolónových antibiotík na povrchovú hydrofobicitu dvoch kmeňov Acinetobacter baumannii (R1a R2). Hydrofobicita sa hodnotila testom adherencie baktérií na xylén a ich agregáciou v roztokochsíranu amónneho. Norfloxacín v koncentráciách 1/4 a 1/8 MIC znížil hydrofobicitu kmeňa R1a kmeňa R2 v koncentrácii 1/16 MIC. Ciprofloxacín bol účinný pre obidva kmene najmä v koncen-trácii 1/4 MICs. Enoxacín (1/8 MIC) významnejšie redukoval hydrofóbne vlastnosti len kmeňa R2.Ostatné koncentrácie vyššie uvedených antibiotík ako aj všetky testované koncentrácie pefloxacínuprakticky neovplyvnili povrchovú bakteriálnu hydrofobicitu.

Klíčová slova:
chinolóny – subinhibičné koncentrácie – Acinetobacter baumannii – povrchováhydrofobicita

Authors: A. Hoštacká
Authors‘ workplace: Ústav preventívnej a klinickej medicíny, Bratislava
Published in: Čes. slov. Farm., 1999; , 272-275
Category:

Overview

Effects of subinhibitory concentrations (sub-MICs) (1/4, 1/8, 1/16 or 1/32 of the MICs) of fourquinolone antibiotics on surface hydrophobicity of two Acinetobacter baumannii strains (R1 and R2)were tested. Hydrophobicity was evaluated by adherence of bacteria to xylene and their aggregationin ammonium sulphate solutions. Norfloxacin in concentrations of 1/4 or 1/8 of the MIC decreasedhydrophobicity of R1 strain and of R2 strain in concentration of 1/16 of the MIC. Ciprofloxacin wasefficient for both strains mainly in concentration of 1/4 of their MICs. Enoxacin (1/8 MIC) moreeffectively reduced hydrophobic properties only in R2 strain. The other concentrations of theabove-mentioned antibiotics as well as all tested concentrations of pefloxacin pract ically did notaffect bacterial surface hydrophobicity.

Key words:
quinolones – subinhibitory concentrations – Acinetobacter baumannii –surface hydrophobicity

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