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Effect of pH on growth and ethanol production byZymomonas

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Summary

In a mineral salts medium containing yeast extract, NH4Cl and glucose (50g/L), the pH range producing the fastest growth ofZ. mobilis was 5.5–6.5 with an apparent optimum at 6.5. At constant growth rate of 0.15hr−1, the specific rates of glucose utilization (qs) and ethanol production (qp) were relatively unaffected by pH over the range 7.0–5.5 but increased sharply as the pH was further decreased below 5.5 to 4.0. Under these conditions the ethanol yield was unaffected by pH over the range 4.0–6.5 but decreased markedly at pH of 7.

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Authors and Affiliations

  1. Department of Biochemistry, University of Toronto, M5S 1A8, Toronto, Ontario, Canada

    Hugh Lawford, Paul Holloway & Antonio Ruggiero

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  1. Hugh Lawford
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  2. Paul Holloway
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  3. Antonio Ruggiero
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Lawford, H., Holloway, P. & Ruggiero, A. Effect of pH on growth and ethanol production byZymomonas . Biotechnol Lett 10, 809–814 (1988). https://doi.org/10.1007/BF01027578

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