Supercritical fluid extraction of murici leaves (Byrsonima crassifolia): Global yield, total phenolic compounds, antioxidant activity, and linear correlations / Extracção de fluido supercrítico de folhas de murici (Byrsonima crassifolia): Rendimento global, compostos fenólicos totais, actividade antioxidante, e correlações lineares

The objective of this study was to obtain extracts from Byrsonima crassifolia leaves by supercritical CO2 (CO2-SFE) in order to determine the experimental data, global yield isotherms, total phenolic compounds, antioxidant activity, and linear correlations. Moisture, particle diameter, apparent and true density, bed porosity, and morphological characterization of murici leaves were analyzed. CO2-SFE was conducted at 313.15 K–323.15 K, and at 10 MPa to 30 MPa. The bed parameters agreed with those used in CO2-SFE, and the particles presented irregular flat shape. The isotherms showed an inflection point, and the highest global yield was obtained at 323.15 K and 30 MPa (1.24% d.b.). The highest values of phenolic compounds (68.85 mg GAE/g d.b.) and antioxidant activity (174.35 μM trolox/g d.b.) were obtained at 313.15 K and 30 MPa, in which a strong positive linear relationship was observed between these responses.