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In Vitro Drug Dissolution: Alternative Methods01:17

In Vitro Drug Dissolution: Alternative Methods

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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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Various dissolution methods are utilized to assess a drug’s dissolution rate, including the flow-through cell, paddle-over-disk, cylinder, and reciprocating disk methods.The flow-through cell apparatus (USP (United States Pharmacopeia) method 4) comprises a reservoir for the dissolution medium and a pump that propels the medium through the cell containing the test sample. This method is crucial for assessing modified-release dosage forms with minimally soluble active ingredients,...
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Variable-focus microscopy and UV surface dissolution imaging as complementary techniques in intrinsic dissolution

Adam Ward1, Karl Walton2, Karl Box3

  • 1Department of Pharmacy, University of Huddersfield, Huddersfield, HD1 3DH, UK.

International Journal of Pharmaceutics
|July 27, 2017
PubMed
Summary
This summary is machine-generated.

Surface topography analysis using a variable-focus microscope can predict intrinsic dissolution rate (IDR) in drug development. This method aids in understanding how surface properties impact drug dissolution, offering valuable insights for formulation optimization.

Keywords:
Alicona infinite microscopeIbuprofenIntrinsic dissolution ratePolymorphismSurface dissolution imagingSurface roughness

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Area of Science:

  • Pharmaceutical Sciences
  • Materials Science
  • Analytical Chemistry

Background:

  • Surface Dissolution Imaging (SDI) is crucial for determining intrinsic dissolution rate (IDR), a key parameter in early drug development.
  • Assessing the surface properties of pharmaceutical compacts is essential for understanding drug release mechanisms.
  • Previous methods for surface analysis may not fully capture the topographical features influencing dissolution.

Purpose of the Study:

  • To introduce a novel approach for assessing compact surface properties relevant to Surface Dissolution Imaging (SDI).
  • To correlate surface topography measurements with intrinsic dissolution rate (IDR) values.
  • To evaluate the utility of a variable-focus optical microscope in characterizing drug compacts for SDI.

Main Methods:

  • Utilized a non-contact, optical, three-dimensional Alicona Infinite Focus Microscope to measure surface topography of ibuprofen (IBU) compacts.
  • Performed Surface Dissolution Imaging (SDI) experiments to determine the intrinsic dissolution rate (IDR) of IBU.
  • Employed Differential Scanning Calorimetry (DSC) and X-ray Diffraction (XRD) to monitor for polymorphic changes during compaction and SDI runs.

Main Results:

  • Ibuprofen's IDR decreased from 0.033 mg/min/cm² to 0.022 mg/min/cm² over 20 minutes during SDI.
  • No significant polymorphic changes were observed in IBU compacts post-compaction or post-SDI, confirmed by XRD and DSC.
  • Distinct surface imprints were observed on some compacts, correlating with changes in IDR, and surface parameters showed strong correlations with IDR values.

Conclusions:

  • Variable-focus microscopy provides valuable topographical data that correlates with intrinsic dissolution rates.
  • Surface topography significantly influences the IDR of pharmaceutical compacts.
  • The Alicona Infinite Focus Microscope serves as a complementary tool for enhancing the determination of IDR through SDI.