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A fermentation process for producing both ethanol and lysine-enriched yeast.

R D Tanner, N T Souki, R M Russell

    Biotechnology and Bioengineering
    |January 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

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    Optimizing baker's yeast fermentation conditions, specifically pH and temperature, significantly enhances L-lysine production. Controlled fermentation at pH 5 and 32°C yielded the highest L-lysine levels, improving yield compared to uncontrolled conditions.

    Area of Science:

    • Biotechnology
    • Industrial Microbiology
    • Biochemical Engineering

    Background:

    • Baker's yeast (Saccharomyces cerevisiae) is a key industrial microorganism.
    • Optimizing fermentation parameters is crucial for maximizing product yield in industrial bioprocesses.

    Purpose of the Study:

    • To investigate the impact of pH and temperature on L-lysine, ethanol, and cell growth in baker's yeast batch fermentation.
    • To identify optimal conditions for enhanced L-lysine production.

    Main Methods:

    • Conducted 18 batch-fermentation experiments using baker's yeast in a glucose-enriched mineral medium.
    • Varied pH and temperature as key engineering variables.
    • Monitored free L-lysine, ethanol, and cell growth over time.

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    Main Results:

    • Maximum free L-lysine levels were achieved at pH 5 and 32°C, reaching 120 mg/liter (threefold increase over uncontrolled).
    • Total L-lysine showed a 25% improvement under optimal conditions.
    • Highest cell growth occurred at 36°C and pH 3; highest ethanol production at 28°C and pH 6.

    Conclusions:

    • pH and temperature are critical, easily adjustable parameters for optimizing baker's yeast fermentation.
    • Specific conditions (pH 5, 32°C) significantly boost L-lysine production, demonstrating potential for industrial application.