Electrostatically Assembled Layer-by-Layer Plasmonic Implant for Combination Therapy against Multidrug-Resistant Chronic Wound Biofilms

Although persistent infection from chronic wound lowers the efficacy of single therapy; But combination therapy with prolonged drug release have shown promising effect, such as elimination of heavy bacterial film and multi/single drug resistance with minimal side effects. One such breakthrough is multilayered scaffold that are chemically and physiologically stable. To achieve this objective, we demonstrated construction of layer-by-layer (LBL) assembly aligned by alternate deposition of (PEI/PSS and PAA/PSS) based on electrostatic force. These films exhibited loading of Ibu and gen which can be altered depending on different parameter such dipping time, pH and number of layers. Briefly, gen was encapsulated onto PPGNRs, as GNRs have good stability and their antibacterial properties can be enhanced by tunning surface upon adding chemical drugs. Such functionalized GNRs showed excellent photo thermal property which assisted controlled release of gen via deconstruction of thin layers, whereas burst release of ibu. Furthermore, complete disruption of bacterial colonies when combined with near infrared irradiation (NIR). The formed LBL endowed the great healing capability, controlled antibiotic release solve the problems of bacterial resistance due to synergistic effect. Taken together, the antibacterial, cytocompatibility, and stimuli responsive characteristics of this robust multilayer assembly can be promising multifunctional drug delivery system in different medical aliments.