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In Vitro Drug Dissolution: Alternative Methods01:17

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Alternative drug dissolution methods include the rotating bottle, intrinsic dissolution test, peristalsis, and the Franz diffusion cell method. The rotating bottle method involves meticulously rotating tightly capped controlled-release beads in a temperature-controlled bath. Periodic decanting of samples allows for residue assay, followed by refilling with fresh medium and testing at various pH levels to emulate the gastrointestinal tract conditions.In contrast, the intrinsic dissolution test...
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Coherent anti-Stokes Raman Scattering CARS Microscopy Visualizes Pharmaceutical Tablets During Dissolution
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[Development of dissolution method for warfarin sodium tablets].

Ivana Lukášová, Jan Muselík, Aleš Franc

    Ceska a Slovenska Farmacie : Casopis Ceske Farmaceuticke Spolecnosti a Slovenske Farmaceuticke Spolecnosti
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    A pH 6.8 buffer dissolution method for warfarin tablets allows profile comparison but is not discriminatory for particle size or hardness. This method is a potential alternative for quality control and stability testing.

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    Area of Science:

    • Pharmaceutical Sciences
    • Drug Product Quality Assessment
    • Dissolution Testing

    Background:

    • Warfarin, a narrow therapeutic index drug, has faced issues with generic substitution linked to altered drug quality.
    • Existing official dissolution methods using aqueous media are non-discriminatory, hindering comparative analysis and stability tracking.
    • A pH 6.8 buffer dissolution method is proposed as a potential alternative for evaluating warfarin quality.

    Purpose of the Study:

    • To evaluate a pH 6.8 buffer dissolution method for warfarin sodium tablets.
    • To assess the suitability of this method for similarity and difference factor calculations.
    • To determine if the method is discriminatory regarding particle size and radial hardness variations.

    Main Methods:

    • Prepared warfarin sodium tablets (10 mg) with varying particle sizes (d50 = 4.8 vs. 22.5 μm) and radial hardness (30 N vs. 100 N).
    • Utilized a pH 6.8 buffer dissolution medium at two stirring speeds (50 and 25 rpm).
    • Assessed content uniformity using process capability index (Cpk) and Bergum method.

    Main Results:

    • The pH 6.8 buffer medium enabled the calculation of similarity and difference factors for dissolution profiles.
    • Under the tested conditions (50 or 25 rpm), the dissolution method was not discriminatory for particle size or radial hardness.
    • Content uniformity was confirmed for the prepared warfarin tablets.

    Conclusions:

    • The pH 6.8 buffer dissolution method is suitable for comparing warfarin tablet dissolution profiles using similarity and difference factors.
    • The method, as applied, lacks discriminatory power for critical quality attributes like particle size and hardness.
    • Further optimization may be needed to enhance the discriminatory capacity of this alternative warfarin dissolution method.