[Stability of tetracycline during fermentation].

Area of Science:

• Pharmaceutical Chemistry
• Chemical Kinetics
• Drug Stability

Context:

• Understanding antibiotic degradation is crucial for effective drug formulation and storage.
• Tetracycline is a widely used antibiotic whose stability can be affected by environmental factors.
• Previous studies have investigated tetracycline degradation, but specific kinetic data at varying pH and temperatures are essential.

Purpose:

• To investigate the thermal stability of tetracycline at acidic pH values (6.0 and 1.5).
• To determine the thermal inactivation kinetics of tetracycline at different temperatures (40-100°C) and pH 1.5.
• To elucidate the degradation mechanism of tetracycline under acidic and thermal stress.

Summary:

• The study quantified tetracycline's thermal inactivation constant at pH 1.5, revealing rates from 1.62 min⁻¹ at 40°C to 65.83 min⁻¹ at 100°C.
• Degradation rates were significantly higher at lower pH, indicating increased instability.
• A proposed degradation mechanism considered variations in entropy and steric factors, offering insights into the molecular pathways.

Impact:

• Provides critical kinetic data for predicting tetracycline shelf-life under specific storage conditions.
• Informs the development of more stable tetracycline formulations.
• Contributes to a deeper understanding of antibiotic degradation mechanisms, aiding in the design of future antimicrobial agents.