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The internal pH ofAcetobacterium wieringaeandAcetobacter acetiduring growth and production of acetic acid

✍ Scribed by Ulrike Menzel; Gerhard Gottschalk

Publisher: Springer
Year: 1985
Tongue: English
Weight: 547 KB
Volume: 143
Category: Article
ISSN: 0302-8933
DOI: 10.1007/bf00414767

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✦ Synopsis

The intracellular pH was measured in growing Acetobacterium wieringae and Acetobacter aceti with an acid equilibrium distribution method. [14C]-acetylsalicylic acid, [14C]-benzoic acid and [14C]-acetic acid were used as ApHindicators. The extracellular pH ofAcetobacterium wieringae decreased from 7.0 to 5.0 during growth; accordingly, the intracellular pH changed from 7.1 to 5.5, and a ApH between 0.1 and 0.65 (interior more alkaline) was maintained. Corresponding results were obtained for Acetobacter aceti. The external pH and the internal pH decreased in parallel from 6.2 to 3.5 and from 5.8 to 3.9, respectively.

This demonstrates that neither the anaerobic nor the aerobic acetogen was able to maintain a large ApH in the presence of high concentrations of acetic acid.

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