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Microbial lipolysis at low temperatures.

R E Andersson

    Applied and Environmental Microbiology
    |January 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Pseudomonas fluorescens lipase production is independent of bacterial numbers. Optimal growth occurs at 20°C, while lipase production peaks at 8°C, showing activity even at low temperatures and in dehydrated conditions.

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    Area of Science:

    • Microbiology
    • Enzymology
    • Biochemistry

    Background:

    • Lipase production by Pseudomonas fluorescens is a key factor in its ecological role and biotechnological applications.
    • Understanding the environmental factors influencing lipase activity is crucial for optimizing its use and predicting its behavior.

    Purpose of the Study:

    • To investigate the relationship between Pseudomonas fluorescens growth and lipase production.
    • To determine the optimal temperatures for bacterial growth and lipase synthesis.
    • To characterize the lipolytic activity of Pseudomonas fluorescens across a range of low temperatures and varying water activities.

    Main Methods:

    • Monitoring lipase production in relation to bacterial cell counts during growth.
    • Assessing lipolytic activity in olive oil emulsions at temperatures from +8°C to -30°C.

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  • Evaluating lipolysis as a function of water activity in dehydrated substrates at low temperatures.

    • Main Results:

    • Lipase production was found to be independent of the total number of Pseudomonas fluorescens bacteria.
    • Optimal temperature for bacterial growth was 20°C, while optimal temperature for lipase production was 8°C.
    • Lipolytic activity showed an initial rapid phase followed by retardation at different levels depending on storage temperature, with activity resuming upon temperature increase. Lipolysis occurred even in dehydrated substrates at low temperatures.

    Conclusions:

    • Bacterial numbers do not directly correlate with lipase production in Pseudomonas fluorescens.
    • Pseudomonas fluorescens exhibits significant lipolytic activity at low temperatures, including in dehydrated environments, suggesting adaptability to cold and dry conditions.
    • Temperature fluctuations can modulate the rate of lipolysis, with higher temperatures reactivating the process.