Drug in adhesive transdermal patch containing antibiotic-loaded solid lipid nanoparticles.

Area of Science:

• Pharmaceutical Sciences
• Biotechnology
• Dermatology

Background:

• The skin's barrier properties limit the transdermal delivery of hydrophobic drugs, especially antibiotics requiring high daily doses.
• Developing effective transdermal drug delivery systems for antibiotics remains a significant challenge in pharmaceutical research.

Purpose of the Study:

• To develop and evaluate a novel transdermal patch for enhanced skin penetration of cephalexin, an antibiotic model drug.
• To investigate the antimicrobial efficacy and biocompatibility of cephalexin-loaded solid lipid nanoparticles (SLNs) in a transdermal patch formulation.

Main Methods:

• Cephalexin was encapsulated into α-tocopherol succinate-based solid lipid nanoparticles (SLNs).
• SLNs were incorporated into a poly-iso-butylene adhesive solution to prepare transdermal patches via solvent casting.
• Physico-chemical properties, in vitro drug release, antimicrobial activity against Staphylococcus aureus, and human fibroblast skin cell proliferation were assessed.

Main Results:

• The optimal transdermal patch formulation containing cephalexin-loaded SLNs showed enhanced antimicrobial activity against S. aureus compared to a formulation with free cephalexin.
• In vitro studies demonstrated that the optimal patch formulation promoted significant proliferation of human fibroblast skin cells (approximately 25.5%).
• Cephalexin-loaded SLNs exhibited favorable characteristics, including a diameter of 180 nm and drug loading of 7.9%.

Conclusions:

• The developed transdermal patch utilizing cephalexin-loaded SLNs offers a promising strategy for overcoming skin barrier limitations in antibiotic delivery.
• The SLN-based transdermal patch not only enhances antimicrobial efficacy but also supports skin health by promoting cell proliferation.
• This innovative approach holds potential for improving the treatment of skin infections and other dermatological conditions requiring transdermal antibiotic therapy.