Caesalpinia spinosa (Molina) Kuntze is a plant species with great potential in medicine, mining, etc. The objectives were to determine the physicochemical parameters and the in vitro antioxidant capacity of the aqueous extract of the fruits of Caesalpinia spinosa (Molina) Kuntze. In the aqueous extract, the physical-chemical characteristics and the presence of main groups of metabolites were determined through phytochemical screening, associated with biological activity. The content of total polyphenols was determined by the Folin-Ciocalteu method and the antioxidant capacity was evaluated in vitro by the method of DPPH and the method of ABTS. The aqueous extract of Caesalpinia spinosa (Molina) Kuntze had a relative density of 1,0024 g/mL. Regarding the phytochemical screening, some metabolites were identified, highlighting phenolic compounds, flavonoids, tannins and heterosides. The tot...

Cinchona micrantha, cinchona tree, is an Amazonian plant traditionally used in the treatment of malaria, possessing antidiarrheal and antipyretic properties. The objective of this study was to determine the physicochemical parameters, in vitro antioxidant capacity and total alkaloids of Cinchona micrantha alcoholic extracts. Extracts were prepared by maceration from the dried barks, using 50%, 70% and 96% ethanol as solvent. The extracts showed values of relative density, total solids, refractive index, Brix degrees and pH. The 70 % extract showed higher antioxidant capacity by the DPPH method with a TEAC of 260.25 ± 4.212 mg trolox/g dry extract and an IC50 of 0.013 ± 0.00, as well as a higher content of alkaloids expressed as percentage of quinine and cinchonin. It is concluded that the physicochemical parameters serve as a quality control tool to have technical specifications of the...