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A simple method for measuring total calcium in small tissue samples

A Johns

    Journal of Pharmacological Methods
    |August 1, 1981
    PubMed
    Summary
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    This study presents a simple and accurate method for measuring total calcium in small tissue samples using aequorin luminescence. The technique is sensitive and specific, capable of quantifying as little as 2 nmol of calcium.

    Area of Science:

    • Biochemistry
    • Analytical Chemistry
    • Cell Biology

    Background:

    • Accurate quantification of intracellular calcium is crucial for understanding cellular processes.
    • Existing methods for calcium determination in small tissue samples can be complex or lack sensitivity.

    Purpose of the Study:

    • To develop a simple, accurate, and sensitive method for determining total calcium in small tissue samples.
    • To utilize the calcium-dependent photoprotein aequorin for luminescence-based calcium measurement.

    Main Methods:

    • Measuring the luminescence of aequorin induced by calcium in tissue samples.
    • Employing the tritium channel of a liquid scintillation counter for luminescence detection.
    • Determining the sensitivity and specificity of the aequorin-based method for calcium.

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    Main Results:

    • The described method is simple and accurate for total calcium determination.
    • The method demonstrates high sensitivity and specificity for calcium.
    • Theoretically, the method can measure calcium in tissue samples as small as 3 mg, quantifying as little as 2 nmol of calcium.

    Conclusions:

    • A novel and efficient method for quantifying calcium in small biological samples has been established.
    • This aequorin-based luminescence assay offers a valuable tool for researchers studying calcium homeostasis.
    • The method's sensitivity and simplicity make it suitable for diverse applications in biological research.