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Disintegration performance of renal multivitamin supplements.

M K Stamatakis1, P J Meyer-Stout

  • 1West Virginia University School of Pharmacy, Morgantown, WV 26506-9520, USA.

Journal of Renal Nutrition : the Official Journal of the Council on Renal Nutrition of the National Kidney Foundation
|March 25, 1999
PubMed
Summary

Renal multivitamin supplements showed variable disintegration times, with performance worsening in higher pH environments. Over half of tested products were significantly affected by pH, indicating potential absorption issues for patients with kidney disease.

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Area of Science:

  • Pharmaceutical Sciences
  • Nutritional Science

Background:

  • Vitamins, regulated as dietary supplements, lack the stringent quality standards of drugs.
  • Impaired disintegration or dissolution can reduce vitamin absorption.
  • Renal disease patients exhibit variable gastrointestinal pH, potentially affecting supplement performance.

Purpose of the Study:

  • To investigate the impact of varying pH levels on the in vitro disintegration of renal multivitamin supplements.

Main Methods:

  • Utilized the United States Pharmacopeial Convention standard disintegration apparatus.
  • Tested products in simulated gastric fluid (low pH), neutral fluid, and intestinal fluid (higher pH).
  • Defined product failure as two or more units failing to disintegrate within compendial limits.

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Main Results:

  • Four out of eleven (36%) renal multivitamin products failed disintegration testing across all tested pH conditions.
  • A significant difference in disintegration time (DT) based on pH was observed in 64% of the products.
  • Increasing pH levels correlated with increased disintegration times.

Conclusions:

  • Commercially available renal multivitamin supplements exhibit highly variable disintegration performance.
  • The poorest product performance was noted in simulated intestinal fluid (higher pH).
  • pH significantly impacts in vitro disintegration for over half of the tested renal multivitamin products, warranting further study into in vivo effects.