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Related Experiment Videos

Improved drug dissolution and product characterization using a crescent-shaped spindle.

Saeed A Qureshi1

  • 1Therapeutic Products Directorate, Health Products and Food Branch (A/L 2202C1), Health Canada, Ottawa K1A 0L2, Canada. saeed_qureshi@hc-sc.gc.ca

The Journal of Pharmacy and Pharmacology
|August 25, 2004
PubMed
Summary

The crescent-shaped spindle provides more accurate drug release data than the USP Paddle spindle. This new spindle design prevents material accumulation and improves product-medium interaction for better drug characterization.

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Applications of a new device (spindle) for improved characterization of drug release (dissolution) of pharmaceutical products.

European journal of pharmaceutical sciences : official journal of the European Federation for Pharmaceutical Sciences·2003
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Area of Science:

  • Pharmaceutical Sciences
  • Drug Delivery and Formulation

Background:

  • The United States Pharmacopeia (USP) Paddle spindle is commonly used for dissolution testing.
  • Potential artifacts associated with the USP Paddle spindle may lead to inaccurate drug release characterization.
  • Improved dissolution testing methods are crucial for accurate pharmaceutical product evaluation.

Purpose of the Study:

  • To compare the drug release characteristics of amoxicillin capsules and calibrator tablets using USP Paddle and crescent-shaped spindles.
  • To evaluate the impact of spindle design on dissolution testing accuracy and product characterization.
  • To identify potential artifacts of the USP Paddle spindle and propose an alternative.

Main Methods:

  • Dissolution experiments were conducted on amoxicillin capsules (250 and 500 mg) and USP calibrator tablets (prednisone and salicylic acid).

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  • Tests utilized both USP Paddle spindles at 50 rpm and crescent-shaped spindles at 25 rpm.
  • Drug release percentages were measured at 30 minutes for all products and conditions.

    • Main Results:

    • The crescent-shaped spindle consistently showed higher drug release percentages compared to the USP Paddle spindle for amoxicillin capsules and prednisone tablets.
    • Paddle spindle dissolution was hindered by disintegrated material accumulation (cone formation) and tablet stagnation.
    • Crescent-shaped spindles prevented material accumulation and improved product-medium interaction, yielding more accurate dissolution profiles.

    Conclusions:

    • The crescent-shaped spindle offers a superior alternative to the USP Paddle spindle for dissolution testing.
    • This spindle design mitigates artifacts related to poor mixing and variable hydrodynamics.
    • Utilizing crescent-shaped spindles can lead to improved drug release characterization and more reliable product quality assessment.