Modified silica matrices for controlled release of cephalexin

Area of Science:

• Materials Science
• Nanotechnology
• Pharmaceutical Sciences

Background:

• Ordered mesoporous silica materials like SBA-15 are promising drug delivery vehicles.
• Surface functionalization is crucial for controlling drug loading and release kinetics.
• Cephalexin, a widely used antibiotic, requires effective delivery systems for improved therapeutic outcomes.

Purpose of the Study:

• To synthesize and characterize amino-functionalized SBA-15 silica.
• To investigate the adsorption and release kinetics of cephalexin using these functionalized materials.
• To compare the efficacy of two different functionalization methods for drug delivery applications.

Main Methods:

• SBA-15 silica was functionalized using two distinct methodologies to introduce amino groups.
• Nitrogen adsorption/desorption, SEM, FT-IR, XPS, and TG/DSC were employed for material characterization.
• UV-visible spectroscopy was utilized to quantify cephalexin in aqueous and physiological solutions.

Main Results:

• The number and location of amino groups, dictated by the functionalization method, influenced cephalexin adsorption capacity and release profiles.
• Materials characterization confirmed successful amino group incorporation and structural integrity.
• UV-Vis spectroscopy provided accurate quantification of cephalexin concentrations.

Conclusions:

• Amino post-functionalization of SBA-15 silica enhances long-term cephalexin delivery compared to co-functionalization.
• The surface chemistry and architecture of functionalized silica significantly impact drug adsorption and release.
• These findings highlight the potential of tailored silica materials for advanced antibiotic delivery systems.