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Related Experiment Videos

Improved method for selenium determination in biological samples by gas chromatography

T P McCarthy, B Brodie, J A Milner

    Journal of Chromatography
    |September 11, 1981
    PubMed
    Summary

    This study introduces a new gas chromatography method for precise selenium determination in biological samples. The assay offers high sensitivity and accuracy, enabling routine microanalysis of selenium levels.

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    Area of Science:

    • Analytical Chemistry
    • Biochemistry
    • Environmental Science

    Background:

    • Selenium is an essential trace element crucial for various biological functions.
    • Accurate determination of selenium in biological matrices is vital for health and environmental monitoring.
    • Existing chromatographic methods for selenium analysis can be prone to errors and interference.

    Purpose of the Study:

    • To develop and validate a sensitive and reliable gas chromatographic assay for selenium determination.
    • To establish a method suitable for routine microanalysis of selenium in biological samples.
    • To overcome limitations of previous chromatographic techniques for selenium quantification.

    Main Methods:

    • Gas chromatography (GC) coupled with electron-capture detection (ECD).

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  • Derivatization of selenium with 4-nitro-o-phenylene-diamine.
  • Establishment of a calibration curve using peak area versus analyte mass.
  • Validation of the method with spiked biological samples.

    • Main Results:

    • A linear calibration curve for the selenium derivative was observed from 5-1000 pg.
    • The limit of detection (LOD) for the electron-capture detector was approximately 0.5 pg.
    • Recoveries of added selenium ranged from 95-105%, indicating high accuracy.
    • The method demonstrated reduced errors due to fewer transfers and elimination of interfering compounds.

    Conclusions:

    • The developed GC-ECD assay provides a sensitive, accurate, and reliable method for selenium microanalysis.
    • This procedure is suitable for routine analysis of biological samples, even those with low selenium concentrations (< 2 ng/200 µL).
    • The method's advantages include reduced contamination risk and elimination of interfering substances, enhancing analytical robustness.