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Related Experiment Videos

A new immunochemical assay for biotin.

L P Thuy1, L Sweetman, W L Nyhan

  • 1Department of Pediatrics, La Jolla, CA 92093.

Clinica Chimica Acta; International Journal of Clinical Chemistry
|October 31, 1991
PubMed
Summary

A new double antibody assay accurately measures biotin levels in plasma and urine. This method uses avidin-biotin binding and centrifugation for precise quantification, establishing normal reference values.

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Clinical Diagnostics

Background:

  • Biotin, a vital B vitamin, plays a crucial role in various metabolic processes.
  • Accurate quantification of biotin levels is essential for diagnosing deficiencies and monitoring health.
  • Existing methods for biotin measurement may have limitations in sensitivity or sample volume requirements.

Purpose of the Study:

  • To develop and validate a novel double antibody technique for separating free and bound biotin.
  • To establish a sensitive assay for quantifying biotin concentrations in biological samples like plasma and urine.
  • To determine normal reference ranges for biotin in human plasma and urine.

Main Methods:

  • A competitive binding assay utilizing [3H]biotin and unlabeled biotin with avidin.
  • Immune precipitation using an anti-avidin goat antibody followed by an antigoat IgG antibody linked to agarose.
  • Separation of free and bound biotin through centrifugation.

Main Results:

  • The double antibody technique effectively separates free biotin from biotin bound to the avidin complex.
  • The assay is sensitive enough to quantify biotin in small sample volumes (100-200 µL plasma, 5-10 µL urine).
  • Normal biotin concentrations were determined as 1.27 ± 0.67 nmol/L in plasma and 49.1 ± 35.7 µmol/mol creatinine in urine.

Conclusions:

  • The developed double antibody method provides a reliable and sensitive approach for biotin quantification.
  • This assay facilitates the determination of clinically relevant biotin levels in plasma and urine.
  • Established normal values serve as a valuable reference for clinical diagnostics and research.

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