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Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are...
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The Effect of Sampling Cannula on In Vitro Dissolution Testing with USP Paddle Method.

Zongming Gao1, Anjanette Smith2

  • 1Food and Drug Administration, Center for Drug Evaluation and Research, Division of Complex Drug Analysis, St. Louis, Missouri, 63110, USA. Zongming.gao@fda.hhs.gov.

The AAPS Journal
|April 26, 2023
PubMed
Summary
This summary is machine-generated.

Sampling cannula size and placement significantly impact in vitro dissolution testing results. Standardizing these factors in dissolution testing SOPs is crucial for reliable drug product quality control.

Keywords:
USP apparatusdissolution testingmedium hydrodynamicssample cannulasampling processvariability

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Area of Science:

  • Pharmaceutical Sciences
  • Drug Product Quality Control

Background:

  • In vitro dissolution testing is vital for drug product quality control and regulatory assessment.
  • Sampling cannulas are used to collect samples but their impact on dissolution variability is not well-defined.
  • Standardized dissolution testing requires understanding and controlling all potential sources of variability.

Purpose of the Study:

  • To evaluate the impact of sampling cannula size (outer diameter) and sampling setting (intermittent vs. stationary) on in vitro dissolution results.
  • To determine if these factors introduce systematic errors in dissolution testing using the USP 2 apparatus.
  • To provide data for establishing clear requirements for sampling cannulas in dissolution testing.

Main Methods:

  • Dissolution testing was performed using the USP 2 apparatus with prednisone disintegrating tablets.
  • Sampling cannulas with outer diameters ranging from 1.6 mm to 9.0 mm were employed.
  • Cannulas were used in both intermittent and stationary settings to collect samples at multiple time points.

Main Results:

  • Both the size (outer diameter) and setting (intermittent/stationary) of the sampling cannula significantly affected dissolution results.
  • The degree of interference was directly proportional to the outer diameter of the sampling cannula.
  • Systematic errors were observed even with a calibrated dissolution apparatus.

Conclusions:

  • Sampling cannula dimensions and sampling procedures can introduce significant variability and systematic errors in dissolution testing.
  • Documenting sampling cannula size and setting in standard operating procedures (SOPs) is essential during method development.
  • Standardization of sampling cannula parameters is critical for ensuring reliable and reproducible dissolution test results.