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Related Concept Videos

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Method validation is a crucial process in analytical chemistry designed to confirm that a given method consistently produces reliable and high-quality results. This process is essential when a method is applied to different sample matrices or when procedural modifications are made, ensuring that the results meet acceptable standards across various applications.
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An analytical methodology can be divided into four sequential steps: technique, method, procedure, and protocol. A technique is a scientific principle that rationalizes a specific phenomenon through chemical measurements. Adapting a technique for analyzing a sample of interest is termed a method. The procedure outlines the directions for performing the analysis via an analytical method. The protocol is the detailed guidelines on the procedure, which should be strictly followed to obtain the...
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Calibration Procedures for Orthogonal Superposition Rheology
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Rheology by Design: A Regulatory Tutorial for Analytical Method Validation.

Ana Simões1,2, Margarida Miranda1,3, Catarina Cardoso4

  • 1Faculty of Pharmacy, University of Coimbra, Portugal, Pólo das Ciências da Saúde, Azinhaga de Santa Comba, 3000-548 Coimbra, Portugal.

Pharmaceutics
|September 3, 2020
PubMed
Summary
This summary is machine-generated.

Standardizing rheology analysis for topical semisolid dosage forms is crucial. This study developed and validated a methodology tutorial, identifying key parameters like thixotropic relative area for robust microstructure characterization.

Keywords:
equipment qualificationmethod validationregulatory requirementsrheologytopical dosage forms

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Area of Science:

  • Pharmaceutical Sciences
  • Materials Science

Background:

  • Quality guidelines (Q8) emphasize product and process understanding for topical semisolid dosage forms.
  • Rheology methods offer significant potential for characterizing the microstructure of these formulations.
  • Standardization of rheology procedures is essential for reliable analysis.

Purpose of the Study:

  • To develop and validate a methodology tutorial for rheology analysis of topical semisolid dosage forms.
  • To assess the impact of critical method variables on rheological attributes.
  • To establish a standard framework for robust rheology profile acquisition.

Main Methods:

  • A 1% hydrocortisone cream was used as a model formulation.
  • Risk assessment analysis was performed to evaluate critical method variables (geometry, temperature, application mode).
  • Rheometer qualification and validation of operational parameters were conducted.

Main Results:

  • Selected critical method variables significantly impacted various rheological attributes.
  • Thixotropic relative area, oscillatory yield point, flow point, and viscosity endpoints were highly sensitive and discriminatory.
  • The developed methodology provided a reliable framework for rheology profile acquisition.

Conclusions:

  • A standardized and validated rheology methodology tutorial is essential for topical semisolid dosage forms.
  • Specific rheological parameters demonstrate high sensitivity for microstructure characterization.
  • This framework supports the development of robust and reproducible rheological analyses in pharmaceutical quality control.