Benzoyl peroxide stability in pharmaceutical gel preparations

Area of Science:

• Pharmaceutical chemistry
• Drug stability studies

Background:

• Benzoyl peroxide is a common active pharmaceutical ingredient.
• Understanding its stability in various formulations is crucial for product efficacy and shelf-life.

Purpose of the Study:

• To investigate the storage stability of benzoyl peroxide.
• To identify specific pharmaceutical gel ingredients that affect benzoyl peroxide degradation.
• To determine formulation strategies to enhance benzoyl peroxide stability.

Main Methods:

• Investigated benzoyl peroxide stability in the presence of individual and combined pharmaceutical gel ingredients.
• Assessed degradation rates at different storage temperatures (30 and 40 degrees Celsius).
• Evaluated the impact of formulation modifications on stability.

Main Results:

• Benzoyl peroxide demonstrated significant instability when exposed to nucleophilic agents and acidic substances.
• Rapid degradation (within 1 month) occurred at 30 and 40 degrees Celsius in the presence of ethanol and acidic chelating agents.
• Replacing ethanol with acetone, removing chelating agents, and adding sodium hydroxide substantially reduced benzoyl peroxide degradation.

Conclusions:

• The stability of benzoyl peroxide in pharmaceutical gels is highly dependent on formulation composition.
• Specific excipients, including ethanol and acidic chelating agents, accelerate benzoyl peroxide degradation.
• Optimized formulations incorporating acetone, absence of chelating agents, and sodium hydroxide can significantly enhance benzoyl peroxide storage stability.