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Related Experiment Videos

A methodological problem in thermoanalytic studies arising from admixed fluoride in the samples.

H Hellauer, R Winkler

    Biochimica Et Biophysica Acta
    |February 15, 1978
    PubMed
    Summary

    Aluminum pan walls react exothermically with sodium fluoride (NaF) near collagen denaturation temperatures. This reaction, forming cryolite, is likely catalyzed by denaturing collagen during microcalorimetric studies.

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    Area of Science:

    • Materials Science
    • Biochemistry
    • Analytical Chemistry

    Background:

    • Microcalorimetry is a sensitive technique for studying thermal events.
    • Collagen denaturation involves significant heat changes.
    • Reactions between experimental apparatus and sample solutions can affect results.

    Purpose of the Study:

    • To investigate exothermic reactions occurring in microcalorimetric measurements.
    • To identify the cause of unexpected heat generation above the collagen denaturation point.
    • To understand the interaction between aluminum sample pans and sodium fluoride solutions.

    Main Methods:

    • Differential Scanning Calorimetry (DSC) was employed.
    • Experiments were conducted using aluminum pans containing sodium fluoride solutions.

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  • Temperatures were controlled around the collagen denaturation point.

    • Main Results:

    • An exothermic reaction was observed between aluminum pan walls and sodium fluoride solutions.
    • This reaction occurred at temperatures just above collagen denaturation.
    • The formation of a fluor-aluminum complex (cryolite) was identified.

    Conclusions:

    • Denaturing collagen appears to catalyze the exothermic reaction between aluminum and sodium fluoride.
    • This catalytic effect leads to cryolite formation.
    • Researchers using microcalorimetry with aluminum pans and fluoride solutions should consider this potential artifact.