Encapsulation of thymus vulgaris essential oil in caseinate/gelatin nanocomposite hydrogel: In vitro antibacterial activity and in vivo wound healing potential

Abstract

Essential oils, derived from aromatic plants, exhibit various pharmacological properties. Nevertheless, their clinical applications are confronted by various limitations, such as chemical instability, low aqueous solubility, and poor bioavailability. Nanoencapsulation is one of the approaches that may circumvent these restraints. Accordingly, the present study encapsulated thyme essential oil (TEO) in sodium caseinate (Na CAS) nanomicelles and formulated a gelatin nanocomposite hydrogel, which was investigated as a drug delivery platform for in vitro antibacterial and in vivo wound healing potential. TEO loaded Na CAS nanomicelles showed particle size of 336 ± 17.35 nm, zeta potential of −44.0 mV and EE% of 75 ± 5%. The release profile of TEO loaded nanocomposite hydrogel revealed a sustained release pattern compared to TEO loaded micelles and free oil. The TEO loaded nanomicelles exhibited a significantly higher antibacterial effect than free TEO, as denoted by leakage of alkaline phosphatase and cell membrane disruptions. Furthermore, the TEO loaded nanocomposite hydrogel significantly promoted wound contraction, reduced interleukin-6, and increased transforming growth factor-β1and vascular endothelial growth factor levels, versus control or blank hydrogel group. Hence, the present study is putting forth the fabricated nanocomposite hydrogel as a multifunctional delivery system for TEO in wound healing applications.