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Related Experiment Videos

Dissolution testing of soft shell capsules-acetaminophen and nifedipine

C B Bottom1, M Clark, J T Carstensen

  • 1Banner Pharmacaps, Inc., High Point, NC 27261, USA.

Journal of Pharmaceutical Sciences
|September 19, 1997
PubMed
Summary

Pelliculation in soft gelatin capsules is a common issue. The United States Pharmacopeia (USP) apparatus III dissolution method effectively distinguished between acceptable and substandard acetaminophen capsules, unlike the USP apparatus II method.

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Area of Science:

  • Pharmaceutical Sciences
  • Drug Delivery Systems
  • Materials Science

Background:

  • Pelliculation, or hardening, of soft gelatin capsules upon aging is a significant challenge in pharmaceutical formulation.
  • This phenomenon differs from hard shell capsules due to the larger gelatin mass in softgel dosage forms.
  • Previous studies indicated that the United States Pharmacopeia (USP) apparatus II dissolution method failed to differentiate between acceptable and failing nifedipine soft shell capsules.

Purpose of the Study:

  • To evaluate the suitability of the USP apparatus III dissolution testing method for assessing pelliculation in soft gelatin capsules.
  • To determine the optimal dissolution medium for distinguishing between acceptable and substandard soft gelatin capsules exhibiting pelliculation.
  • To investigate the impact of formaldehyde concentration on controlled pelliculation in acetaminophen soft gelatin capsules.

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Main Methods:

  • Acetaminophen soft gelatin capsules were prepared with varying formaldehyde concentrations (0, 20, 80 ppm) to induce controlled pelliculation.
  • Capsules were subjected to both ambient and accelerated storage conditions.
  • Dissolution testing was performed using both the USP apparatus II and USP apparatus III methods.

Main Results:

  • The USP apparatus III method demonstrated superior ability to differentiate between acceptable and substandard capsules compared to the USP apparatus II method.
  • Formaldehyde concentration directly influenced the degree of pelliculation observed in the soft gelatin capsules.
  • Dissolution profiles obtained from USP apparatus III testing correlated well with the physical changes indicative of pelliculation.

Conclusions:

  • The USP apparatus III dissolution method is a more suitable tool for assessing the quality of soft gelatin capsules prone to pelliculation.
  • The findings provide a basis for developing more robust dissolution testing protocols to ensure the stability and efficacy of soft gelatin drug products.
  • Further research into dissolution media optimization could enhance the predictive power of this method for capsule aging studies.