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Vitamin B-6: a status report.

J E Leklem1

  • 1Department of Nutrition and Food Management, Oregon State University, Corvallis 97331-5103.

The Journal of Nutrition
|November 1, 1990
PubMed
Summary
This summary is machine-generated.

Assessing vitamin B-6 status requires multiple indicators. Combining direct measures like plasma pyridoxal 5'-phosphate (PLP) with indirect functional tests and dietary intake provides a comprehensive nutritional evaluation.

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Area of Science:

  • Nutritional Biochemistry
  • Human Nutrition
  • Biochemical Markers

Background:

  • Growing recognition of vitamin B-6's crucial role in human nutrition over the last 50 years.
  • Advancements in understanding and evaluating vitamin B-6 status.

Purpose of the Study:

  • To outline and differentiate various direct and indirect biochemical indices for assessing vitamin B-6 status.
  • To emphasize the necessity of combining multiple measures for accurate nutritional assessment.

Main Methods:

  • Review of established direct measures: plasma pyridoxal 5 -phosphate (PLP), plasma pyridoxal, total vitamin B-6, and urinary 4-pyridoxic acid.
  • Inclusion of indirect measures: tryptophan load test (xanthurenic acid excretion) and erythrocyte transaminase activity.
  • Consideration of dietary assessment: vitamin B-6 and protein intake.

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Main Results:

  • Plasma PLP is the most relevant direct measure for vitamin B-6 status.
  • Urinary 4-pyridoxic acid and indirect functional tests (e.g., tryptophan load) offer valuable complementary data.
  • Accurate assessment necessitates integrating biochemical markers with dietary intake of vitamin B-6 and protein.

Conclusions:

  • A comprehensive vitamin B-6 status evaluation requires a combination of plasma PLP, urinary 4-pyridoxic acid, at least one indirect measure, and dietary intake analysis.
  • Emerging methods like plasma pyridoxal and erythrocyte PLP show promise for future, refined status assessment.