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Related Experiment Videos

Fractional zinc absorption using a single isotope tracer.

G S Yeung1, C S Schauer, S H Zlotkin

  • 1Department of Nutritional Sciences, University of Toronto, Toronto, Canada.

European Journal of Clinical Nutrition
|January 10, 2002
PubMed
Summary

This study introduces a simplified method for measuring zinc absorption using a single oral isotope dose, eliminating the need for intravenous administration. The new approach accurately estimates zinc absorption, comparable to the traditional dual isotope method.

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Area of Science:

  • Nutritional Science
  • Biochemistry
  • Medical Research

Background:

  • Fractional absorption of zinc (Zn) is typically measured using dual isotopes with oral and intravenous doses.
  • This method requires venipuncture and measurement of double isotopic enrichment in urine.
  • A simpler method was investigated to reduce procedural complexity.

Purpose of the Study:

  • To determine a constant (k) for urine zinc enrichment after intravenous administration.
  • To utilize 'k' for calculating fractional zinc absorption.
  • To compare these results with the standard dual isotope method.

Main Methods:

  • A single-arm cohort study involving 17 healthy adults.
  • Administration of a single intravenous dose of (67)Zn and a single oral dose of (70)Zn.

Related Experiment Videos

  • Measurement of isotopic enrichment in urine to calculate fractional zinc absorption.

    • Main Results:

    • The constant (k) was estimated at 1.60 mg.
    • No significant difference was found in mean fractional zinc absorption between the single-isotope (12.58%) and dual-isotope (12.68%) methods.
    • A high correlation (r=0.81) was observed between the two methods.

    Conclusions:

    • A simplified method using a single oral dose of isotopic-enriched zinc and a constant (k) can effectively estimate fractional zinc absorption.
    • This approach may replace the conventional dual isotope method, reducing the need for venipuncture.
    • The findings support a more accessible way to assess zinc absorption in populations.