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Folic acid: a biopharmaceutical evaluation
Karime Resende Bellavinha1, Neila Márcia Silva-Barcellos, Janine Braga Souza
1Departamento de Farmácia and.
Pharmaceutical Development and Technology
|May 29, 2014
Summary
Folic acid solubility and tablet dissolution are pH-dependent, impacting drug absorption. This study suggests that biopharmaceutical classification system (BCS) based biowaiver decisions for folic acid products are challenging due to these factors.
Area of Science:
- Pharmaceutical Sciences
- Biopharmaceutics
Background:
- Aqueous solubility and drug product dissolution are critical for drug absorption from oral dosage forms.
- Evaluating biowaivers for new folic acid products requires understanding its biopharmaceutical properties.
Purpose of the Study:
- To conduct a biopharmaceutical study on folic acid.
- To assess the suitability of a biowaiver for new folic acid products based on solubility and dissolution.
Main Methods:
- Studied folic acid raw material solubility and dissolution profiles of two commercial products.
- Utilized three different pH buffers (1.2, 4.5, 6.8) for solubility and dissolution testing (Apparatus II, 50 rpm, 900 mL).
- Compared dissolution profiles using dissolution efficiency and statistical analysis (t-test, ANOVA).
Main Results:
- Folic acid solubility and tablet release are significantly pH-dependent.
- Dissolution profiles were similar at pH 1.2 (p > 0.05) but dissimilar at pH 4.5 and 6.8 (p < 0.05) between the two products.
- Significant differences were observed in folic acid dissolution profiles for each product across the three tested pH media.
Conclusions:
- The physicochemical properties of folic acid influence its dissolution and absorption.
- Biowaiver decisions for folic acid products based solely on the Biopharmaceutical Classification System (BCS) are difficult to justify.
- Further investigation into folic acid's biopharmaceutical behavior is warranted for regulatory considerations.
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