Preclinical Trial of Ocotea puberula (Rich.) Nees ("Canela-Guaicá") in Wound Healing: Validation of a Traditional Medicine Practice Used by Indigenous Groups in Southern Brazil

Abstract

Background. "Canela-guaicá,""guaicá,"or "canela-sebo"[Ocotea puberula (Rich.) Nees] is a native species that is traditionally used by Kaingang indigenous groups for wound healing in southern Brazil. The aim of this study was to extract the mucilage from O. puberula barks, perform its phytochemical and physicochemical characterization, and investigate its healing potential. Methods. A murine wound model was used as a preclinical trial for authentication of the traditional knowledge from Kaingang indigenous communities. Results. Alkaloids and polysaccharides were identified by usual qualitative reactions and Fourier-transform infrared spectroscopy. This natural product showed thermal stability and pseudoplastic properties that were considered suitable for the intended use. A higher initial exacerbation of inflammatory response after 7 days, an improved angiogenesis after 14 days, and an increased wound shrinkage after 21 days were statistically significant for the "canela-guaicá"bark extract in the preclinical trial when compared to the silver calcium alginate dressing (positive control). Conclusion. The healing potential of the "canela-guaicá"bark extract, traditionally used by the Kaingang indigenous community from southern Brazil, was preclinically validated. This study paves the way for designing novel wound dressings containing this natural product in order to treat acute and chronic wounds.