Reference : Evaluation of viability and growth of Acetobacter senegalensis under different stress...
Scientific journals : Article
Life sciences : Biotechnology
http://hdl.handle.net/2268/146060
Evaluation of viability and growth of Acetobacter senegalensis under different stress conditions
English
Shafiei, Rasoul mailto [Université de Liège - ULiège > > > GIGA - Utilisateurs machines]
Thonart, Philippe mailto [Université de Liège - ULiège > Département des sciences de la vie > Biochimie et microbiologie industrielles >]
Delvigne, Frank mailto [Université de Liège - ULiège > Chimie et bio-industries > Bio-industries >]
babnnejad, manoochehr mailto []
Mar-2013
International Journal of Food Microbiology
Elsevier Science
Yes (verified by ORBi)
International
0168-1605
Amsterdam
The Netherlands
[en] Acetic acid bacteria (AAB) are used in production of vinegars. During acetic acid fermentation, AAB encounter various aggressive conditions which may lead to a variety of cellular disorders. Previous researches mainly studied the influences of different carbon sources on tolerance of AAB to ethanol and acetic acid. In this study, different techniques were used comparatively to investigate the effects of preadaptation on the ability of A. senegalensis to tolerate ethanol and acetic acid. In general, the carbon sources used for preadaptation of A. senegalensis exhibited significant effects on the tolerance of cells to stressors. Flow-cytometric assessments of preadapted cells in ethanol showed that 87.3% of the cells perform respiration after exposure to a stress medium containing 5% (v/v) ethanol and 3% (w/v) acetic acid. However, 58.4% of these preadapted cells could keep their envelope integrity under the stress condition. They could also grow rapidly (μmax = 0.39/h) in the stress medium (E5A3) with a high yield (>80%). A. senegalensis grown in glucose exhibited a low tolerance to acetic acid. Analysis of their respiration capacity, membrane integrity and culturability revealed that almost
all the population were dead after exposure to 5% (v/v) ethanol and 3% (w/v) acetic acid. In contrast, exposure of A. senegalensis preadapted in a mixture of glucose and acetic acid to a stress medium containing 5% (v/v) ethanol and 3% (w/v) acetic acid, exhibited an intact respiration system and cellular membrane integrity in 80.3% and 50.01% of cells, respectively. Moreover, just 24% of these cells could keep their culturability under that stress condition.
http://hdl.handle.net/2268/146060
10.1016/j.ijfoodmicro.2013.03.011

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