RESUMO
Stryphnodendron adstringens is a typical tree from Brazilian Savanah used in medicine as an anti-inflammatory and antiseptic agent. It is secondary metabolites has biological activities, so the development of efficient extraction methods is essential. Microwave irradiation through assisted extraction is innovative and highly efficient for bioactive compounds. The aim of this study was to optimize an extractive method for phenolics compounds, as tannins, from the stem bark of "barbatimão" by microwave irradiation using a statistical planning and to evaluate its consistency with conventional extraction. Microwave irradiation extraction, 16.36-22.12% of phenols and 15.91-18.69% of tannins, has a better yield when compared to conventional extraction, 14.99% of phenols and 16.70% of tannins. The method by microwave irradiation is consistent with the conventional one. However, extraction by microwave irradiation had a reduction in reaction time, reagent volume, samples amount and energy consumption when compared to conventional extraction.