In the present study, a promising pH-responsive wound dressing was prepared. Halloysite nanotube (HNT) composites were modified with different concentration of both poly (lactic-co-glycolic acid) (PLGA) and chitosan (CS) through the Layer-by-Layer (LbL) strategy for targeted and controlled drug delivery of minocycline (MC). The resulting composites were characterized by FT-IR, XRD, zeta-potential, TGA, FE-SEM and TEM studies. Studying the biodegradability, water uptake, photostability, and water vapor transmission of resulting composites revealed that the composite film absorbed wound secretions, did not degrade, and penetrated properly to wound during the treatment. The results of protein adsorption showed that the optimized composite (C40P60MNT) was blood-compatible. Studying the release profile of the drug showed pH-responsive behavior that was fitted with Korsmeyer-Peppas kinetic model. In-vitro antibacterial testing showed that the C40P60MNT sample had an acceptable effect on the inhibition of gram-positive and gram-negative bacteria. In wound healing test (in-vivo studies), this MC loaded composite film showed faster healing of the burn wound in rat compare to the control sample. Due to the characteristics of the optimized sample, it can be considered as a promising candidate for pH-responsive drug delivery in the treatment of chronic burn wounds.
Keywords: Burn wound; Halloysite nanotube; Minocycline hydrochloride.
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