Comparing the release of erythromycin and vancomycin from calcium polyphosphate hydrogel using different drug loading...

Area of Science:

• Biomaterials Science
• Drug Delivery Systems
• Materials Chemistry

Background:

• Calcium polyphosphate (CPP) hydrogels are explored for drug delivery applications.
• Effective loading and controlled release of antibiotics are crucial for therapeutic efficacy.
• Understanding the interaction between CPP hydrogel and antibiotics is key to optimizing drug delivery.

Purpose of the Study:

• To investigate two methods for loading erythromycin (EM) and vancomycin (VCM) into CPP hydrogel: Gel Mixture and Powder Mixture.
• To evaluate the release kinetics and characterize the interaction between CPP hydrogel and loaded antibiotics.
• To assess the influence of antibiotic properties on CPP hydrogel characteristics.

Main Methods:

• Two antibiotic loading techniques: Gel Mixture (direct addition to formed hydrogel) and Powder Mixture (mixing with CPP powder before hydrogel formation).
• Antibiotic release profiles were monitored for up to 48 hours.
• Raman spectroscopy and rheometer analysis were employed to characterize hydrogel-antibiotic interactions and properties.

Main Results:

• The Gel Mixture method significantly reduced the burst release of antibiotics compared to the Powder Mixture method.
• Raman spectroscopy indicated a close interaction between antibiotics and the CPP hydrogel matrix in the Gel Mixture method.
• Antibiotic incorporation did not interfere with CPP gel formation in the Powder Mixture method, suggesting no ionic interaction.

Conclusions:

• The Gel Mixture method offers a promising approach for sustained antibiotic release from CPP hydrogel due to enhanced drug-matrix interaction.
• The Powder Mixture method facilitates CPP hydrogel formation without compromising its structure, but with less favorable drug interaction.
• CPP hydrogel shows potential as a ceramic matrix for sustained drug delivery, requiring further research.