Studies on Oxidation-Reduction Potentials (ORP) of Microbial Cultures |
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| Authors: | Motoyoshi Hongo Ayaaki Ishizaki Masaru Uyeda |
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| Institution: | Laboratory of Applied Microbiology, Department of Agricultural Chemistry, Kyushu University, Fukuoka, Japan |
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| Abstract: | At maximum production of l-glutamic acid, the oxidation-reduction potential of the culture broth in l-glutamic acid fermentation showed a stable value of 9.0 to 9.6 as rH value. When biotin concentration in the medium was high (40γ/liter), the production of l-glutamic acid decreased, and the rH was 8.0 and it was out of accordance with that of the control (biotin-poor; 2γ/liter). Under “less-aerobic” conditions, its rH rose to 10.4.From these results, it was concluded that the rH during maximum production of l-glutamic acid showed a stable value affected actively by the redox system, l-glutamic acid/α-ketoglutaric acid and  | |
| Keywords: | ribonuclease base specificity stability Dictyostelium discoideum Physarum polycephalum |
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