In vitro Assessment of Green Polyhydroxybutyrate/Chitosan Blend Loaded with Kaempferol Nanocrystals as a Potential Dressing for Infected Wounds

Nanotechnology. 2021 Apr 14. doi: 10.1088/1361-6528/abf7ee. Online ahead of print.


Despite the major medical advancements in recent decades, treating infected wounds successfully remains a challenge. In this research, a functional blend of Polyhydroxybutyrate (PHB) and Chitosan (Cs) was developed for wound infection mitigation with tailored biological and physicochemical properties. Water insoluble kaempferol (KPF) was pre-formulated to water soluble KPF nanocrystals (KPF-NCs) with fine particle size of 145±11 nm, and high colloidal stability (-31±0.4 mv) to improve its drug transdermal delivery. PHB-Cs-KPF-NCs (1:2 ratio) film owned the best physical properties in terms of high breathability, thermal stability and mechanical strength (33±1 MPa). Besides, XRD and FTIR findings indicated the interaction between Cs, PHB and KPF, reducing the film crystallinity. The scanning electron microscopy (SEM) of the film displayed a highly interconnected porous morphology. KPF-NCs were integrated in PHB-Cs matrix with a marked encapsulation efficiency of 96.6%. The enhanced drug-loading film showed a sustain release pattern of KPF-NCs over 48 hrs. Interestingly, the developed blend possessed an impressive blood clotting capacity within 20 min. Furthermore, we presented a new naturally-sourced mixture of Cs+KPF-NCs with powerful antibacterial effects against MDR Staphylococcus aureus and Acentibacter baumannii at very low concentrations. The membrane evidenced a remarkable antibacterial nature in vitro with almost 100% cell viability reduction against the study strains after 48 hrs. By virtue of these advantages, this green blend is highly proposed for optimal wound care.

PMID:33853056 | DOI:10.1088/1361-6528/abf7ee