Carvacrol and 1,8-cineole alone or in combination at sublethal concentrations induce changes in the cell morphology and membrane permeability of Pseudomonas fluorescens in a vegetable-based broth.

Autor: de Sousa JP; Department of Nutrition, Health Sciences Center, Federal University of Pernambuco, Recife, Brazil., Torres Rde A, de Azerêdo GA, Figueiredo RC, Vasconcelos MA, de Souza EL
Jazyk: angličtina
Zdroj: International journal of food microbiology [Int J Food Microbiol] 2012 Aug 01; Vol. 158 (1), pp. 9-13. Date of Electronic Publication: 2012 Jun 21.
DOI: 10.1016/j.ijfoodmicro.2012.06.008
Abstrakt: This study aimed to investigate the effects of sublethal concentrations of carvacrol (CAR) and 1,8-cineole (CIN) alone and in combination on the morphology, cell viability and membrane permeability of Pseudomonas fluorescens ATCC 11253 cultivated in a vegetable-based broth. Transmission and scanning electron microscopy images of bacterial cells exposed to CAR and CIN alone or in combination showed marked ultrastructural changes after 1h of exposure. These changes included shrunken protoplasm, discontinuity of the outer and cytoplasmic membranes and leakage of the intracellular material. Confocal scanning laser microscopy images corroborated the electron microscopy data, showing a decrease in the number of SYTO-9 cells (intact cells) with a concomitant increase in the number of PI-positive cells (dead cells). All of these morphological changes are indicative of increased membrane permeability and the loss of bacterial envelope integrity, which ultimately lead to cell death. The combination of sublethal concentrations of CAR and CIN could be applied to inhibit the growth of P. fluorescens on vegetables.
(Copyright © 2012 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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