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[Yeasts utilizing the surface-active substance Laurox-9].

V V Dmitriev, I I Bibikova, E N Ofitserov

    Mikrobiologiia
    |March 1, 1988
    PubMed
    Summary
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    Two yeast species, Cryptococcus humicolus and Rhodotorula mucilaginosa, can metabolize the non-ionic surfactant Laurox-9. R. mucilaginosa uses Laurox-9 as a carbon source, with the initial step being hydrolytic cleavage.

    Area of Science:

    • Microbiology
    • Biochemistry
    • Environmental Science

    Background:

    • Surfactants like Laurox-9 are widely used but their environmental fate and microbial degradation pathways are not fully understood.
    • Investigating microbial utilization of non-ionic surfactants is crucial for bioremediation and understanding pollutant metabolism.

    Purpose of the Study:

    • To identify yeast species capable of utilizing the non-ionic surfactant Laurox-9.
    • To elucidate the initial metabolic step and optimal conditions for the enzymatic degradation of Laurox-9 by yeasts.

    Main Methods:

    • Isolation and identification of yeast strains from environmental samples.
    • Quantitative analysis of Laurox-9 utilization using IR spectrometry.
    • Electron-cytochemical localization of the hydrolase enzyme responsible for Laurox-9 cleavage.

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    Main Results:

    • Cryptococcus humicolus and Rhodotorula mucilaginosa were identified as yeasts capable of utilizing Laurox-9.
    • Rhodotorula mucilaginosa demonstrated the ability to use Laurox-9 as its sole carbon source.
    • The primary metabolic step involves hydrolytic cleavage of Laurox-9 into lauric acid and polyethyleneglycol.
    • Optimal conditions for the electron-cytochemical localization of the involved hydrolase were determined, revealing its exocellular location.

    Conclusions:

    • Yeasts, specifically R. mucilaginosa, can effectively metabolize the non-ionic surfactant Laurox-9.
    • The identified hydrolase plays a key role in the initial breakdown of Laurox-9, with an exocellular localization.
    • This study provides insights into the microbial degradation of surfactants, relevant for environmental applications.