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Lactic acid utilization by the cutaneous Micrococcaceae.

R F Smith

    Applied Microbiology
    |April 1, 1971
    PubMed
    Summary
    This summary is machine-generated.

    Human skin bacteria, staphylococci and micrococci, can use lactic acid for energy. Specific forms of lactic acid inhibited bacterial growth, but dilution allowed utilization even with fatty acids present.

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    Area of Science:

    • Microbiology
    • Biochemistry

    Background:

    • Cutaneous staphylococci and micrococci are common bacteria found on human skin.
    • Understanding their metabolic capabilities is crucial for dermatology and microbiology.

    Purpose of the Study:

    • To investigate the utilization of lactic acid as an energy source by human cutaneous staphylococci and micrococci.
    • To determine the effect of different lactic acid isomers and fatty acids on bacterial growth and metabolism.

    Main Methods:

    • Culturing selected strains of staphylococci and micrococci on a minimal medium.
    • Assessing the utilization of various substrates, including lactic acid isomers and propionic acid.
    • Evaluating the inhibitory effects of lactic acid at different pH levels and in the presence of fatty acids.

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    Main Results:

    • Lactic acid was utilized as an energy source by the studied bacteria.
    • Propionic acid was not utilized.
    • L-lactic acid and pyruvic acid could substitute for LD-lactic acid.
    • Specific lactic acid isomers (L(+) and D(-)) showed greater inhibition than the balanced LD form, especially at pH 5.6.
    • Bacterial utilization of lactic acid was observed even in the presence of oleic and palmitic acids at specific concentrations.

    Conclusions:

    • Human cutaneous staphylococci and micrococci possess the metabolic pathways to utilize lactic acid.
    • The specific stereoisomeric form of lactic acid influences its utilization and inhibitory potential.
    • Fatty acids, common on skin, do not entirely prevent lactic acid metabolism by these bacteria under certain conditions.