"Arnicas" from Brazil: comparative analysis among ten species

ABSTRACT

Abstract The "arnicas" found in Brazil are examples of different species of the family Asteraceae used in popular medicine for its attributed anti-inflammatory action. Among the species known and used as "arnica" we selected Calea uniflora Less., Chaptalia nutans (L.) Polák, Lychnophora ericoides Mart., Lychnophora pinaster Mart., Lychnophora salicifolia Mart., Lychnophora diamantinana Coile & S.B.Jones, Porophyllum ruderale (Jacq.) Cass., Pseudobrickellia brasiliensis (Spreng.) R.M.King & H.Rob., Sphagneticola trilobata (L.) Pruski, and Solidago chilensis Meyen, due to their extensive use. This research provides new information on leaf morphology and anatomy and on chemistry of the major metabolites found in these species through histochemical tests and phytochemical review. The results revealed anatomical characters for the differentiation and quality control of the vegetal drugs, being these distinctive epidermal attachments, epidermis cells, parenchymal cells of the mesophyll, vascular bundles, midvein patterns and secretory structures of exudation of secondary metabolites. The review of chemical profiles showed differences in the chemical composition of the species, as different skeletons of sesquiterpene lactones in the species evaluated in addition to other chemical classes such as terpenes, flavonoids, chromenes and phenolic acids derivate. Based on the results obtained in this work it is important to emphasize that the information about the ten species of arnica generate subsidies for differentiation and identification of characteristic markers and for the diagnosis of the species and it can be applied in the "arnicas" quality control.