Corticosteroid determination in skin preparations by a reaction rate method

Area of Science:

• Pharmaceutical Analysis
• Analytical Chemistry
• Biochemistry

Background:

• Corticosteroids are widely used in dermatological preparations.
• Accurate quantification of these active ingredients is crucial for drug efficacy and safety.
• Existing analytical methods can be time-consuming and resource-intensive.

Purpose of the Study:

• To develop a rapid and accurate reaction rate method for determining specific corticosteroids.
• To validate the new method against established analytical techniques.
• To assess the applicability of the method for analyzing pharmaceutical skin preparations.

Main Methods:

• Modification of the blue tetrazolium reaction for kinetic analysis.
• Determination of corticosteroids including betamethasone, betamethasone valerate, triamcinolone acetonide, and fluocinolone acetonide.
• Measurement of absorbance at specific time intervals (30-70 seconds).

Main Results:

• The reaction rate method demonstrated high linearity and precision, with relative standard deviations ranging from 0.3% to 1.9%.
• Analysis times were significantly reduced to 30-70 seconds.
• Results obtained from pharmaceutical skin preparations showed excellent correlation with the standard equilibrium method.
• The method was also effective for analyzing mixtures of betamethasone and betamethasone valerate.

Conclusions:

• The developed reaction rate method provides a fast, reliable, and accurate approach for corticosteroid determination.
• This method is suitable for the quality control of pharmaceutical skin preparations containing these active ingredients.
• The kinetic approach offers a significant improvement over conventional time-consuming methods.