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Biological X-ray microanalysis

T A Hall

    Journal of Microscopy
    |September 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    X-ray microanalysis can detect trace elements in biological tissues. Proper cryopreparation is crucial for accurate elemental analysis in ultrathin sections, overcoming beam damage challenges.

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    Area of Science:

    • Analytical Chemistry
    • Biological Sciences
    • Materials Science

    Background:

    • X-ray microanalysis offers high sensitivity for elemental detection.
    • Challenges in biological microanalysis include specimen preparation and beam damage.
    • Accurate elemental mapping is vital for understanding biological processes.

    Purpose of the Study:

    • To detail the practical application of X-ray microanalysis in biological samples.
    • To highlight the importance of cryopreparation techniques for elemental analysis.
    • To demonstrate the capability of measuring elemental mass fractions in biological tissues.

    Main Methods:

    • Utilizing X-ray microanalysis with static-probe analysis.
    • Employing ultrathin sectioning for high spatial resolution (20-30 nm).

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  • Implementing careful cryopreparation, including quench-freezing of tissue samples.

    • Main Results:

    • Detection of approximately 10(-19) g of an element is achievable.
    • Successful measurement of local mass fractions for both diffusible and bound elements.
    • Demonstrated feasibility of analyzing elemental distribution in frozen-dried or frozen-hydrated sections.

    Conclusions:

    • X-ray microanalysis is a powerful tool for elemental detection in biological samples.
    • Cryopreparation is essential to mitigate specimen preparation and beam damage issues.
    • This technique enables in vivo elemental site determination and mass fraction quantification.