Polymers Enhance Chlortetracycline Hydrochloride Solubility.

Area of Science:

• Pharmaceutical Sciences
• Materials Science

Background:

• Chlortetracycline hydrochloride (CTC) is a broad-spectrum antibiotic with limited clinical use due to poor solubility, stability, and bioavailability.
• Developing effective drug delivery systems is crucial for improving the therapeutic efficacy of poorly soluble compounds like CTC.

Purpose of the Study:

• To enhance the solubility, dissolution rate, and stability of chlortetracycline hydrochloride (CTC).
• To develop novel solid polymer dispersions of CTC using various hydrophilic polymers and characterize their properties.

Main Methods:

• Solid dispersions of CTC were prepared using a medium grinding method with hydrophilic polymers like povidone K30 (PVPK30), hydroxypropyl-β-cyclodextrin (HP-β-CD), and gelatin.
• Characterization involved scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), powder X-ray diffraction (PXRD), Fourier-transform infrared spectroscopy (FT-IR), and particle size distribution (PSD).
• In vitro dissolution studies were conducted to evaluate the drug release profiles.

Main Results:

• Optimized solid dispersions significantly increased CTC solubility: PVPK30 (6.25-fold), HP-β-CD (7.7-fold), and gelatin (3.75-fold) compared to pure CTC.
• Gelatin-based solid dispersions exhibited a higher initial dissolution rate and smaller, more uniform particle sizes.
• Characterization techniques confirmed successful formation of solid dispersions and improved physical properties.

Conclusions:

• Solid polymer dispersions effectively improved the solubility, dissolution rates, and stability of chlortetracycline hydrochloride.
• The developed solid dispersions, particularly the gelatin-based formulation, show promise as advanced drug delivery systems for CTC.
• Further investigation into these solid dispersions could lead to improved clinical applications of chlortetracycline hydrochloride.