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Related Experiment Videos

A new application for the Antoine equation in formulation development.

K Chatterjee1, D Dollimore, K Alexander

  • 1College of Pharmacy and Department of Chemistry, The University of Toledo, Toledo, OH 43606, USA.

International Journal of Pharmaceutics
|February 13, 2001
PubMed
Summary
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A new thermogravimetric method simplifies evaluating ingredient evaporation in formulations. This rapid technique uses the Antoine equation to estimate vapor pressure characteristics for improved pre-formulation studies.

Area of Science:

  • Analytical Chemistry
  • Physical Chemistry
  • Materials Science

Background:

  • Accurate characterization of formulation components is crucial for pre-formulation and formulation studies.
  • A rapid method to evaluate ingredient evaporation characteristics can significantly streamline this process.

Purpose of the Study:

  • To develop a simple and rapid thermogravimetric method for estimating vapor pressure characteristics.
  • To utilize the Antoine equation as the primary analytical tool for this estimation.

Main Methods:

  • Thermogravimetric analysis under optimized conditions (10°C/min heating rate, dry nitrogen atmosphere at 100 ml/min).
  • Application of the Antoine equation for vapor pressure estimation.
  • Use of methyl paraben as a calibration compound with known Antoine constants.

Related Experiment Videos

  • Evaluation of thermodynamic parameters using the Langmuir equation.

    • Main Results:

    • The heat treatment of most benzoic acid derivatives followed zero-order rate processes, correlating well with evaporation.
    • The coefficient of vaporization (k macro) was determined as 124,525+/-0.8 SI units.
    • Antoine constants were calculated for the tested compounds based on their vapor-pressure plots.

    Conclusions:

    • The developed thermogravimetric method provides a rapid and simple approach for estimating vapor pressure characteristics.
    • This method facilitates the characterization of formulation components, aiding in pre-formulation and formulation development.
    • The study successfully calculated Antoine constants for various compounds, enhancing their physicochemical characterization.