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Related Experiment Videos

Sputum fixatives: how safe is 50% alcohol?

C M O'Hara, S P Birmingham

    Acta Cytologica
    |July 1, 1976
    PubMed
    Summary

    Fifty percent ethyl alcohol fixative effectively kills most bacteria in cytology specimens but is selective against gram-negative organisms. It preserves staining ability but inhibits fungal growth, impacting Histoplasma and Cryptococcus viability.

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    Area of Science:

    • Microbiology
    • Cytopathology
    • Medical Laboratory Science

    Background:

    • Cytology specimens often contain microorganisms.
    • Fixatives are crucial for preserving cellular and microbial morphology.
    • The effect of ethyl alcohol fixative on microorganisms requires detailed investigation.

    Purpose of the Study:

    • To evaluate the bactericidal efficacy of 50% ethyl alcohol fixative.
    • To determine the selectivity of this fixative against different bacterial types.
    • To assess the impact of fixation on microbial staining characteristics and viability.

    Main Methods:

    • Cytology specimens with microbial presence were fixed in 50% ethyl alcohol.
    • Bacterial counts were assessed before and after fixation.
    • Gram staining was performed to evaluate morphological preservation.
    • Fungal cultures (Histoplasma, Cryptococcus) were attempted after varying fixation times.

    Main Results:

    • The fixative demonstrated bactericidal activity against 90-95% of bacteria.
    • A selective effect against gram-negative cocci and rods was observed.
    • The fixative did not interfere with the characteristic staining of organisms.
    • Fungal growth of Histoplasma and Cryptococcus was inhibited after a 2-hour fixation, with no growth after 6 weeks.

    Conclusions:

    • 50% ethyl alcohol is a potent bactericidal agent for cytology specimens.
    • The fixative exhibits selectivity against gram-negative bacteria.
    • Microbial staining properties are generally preserved.
    • Ethyl alcohol fixation significantly impacts the viability of Histoplasma and Cryptococcus, preventing growth.

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