Extraction and composition of extracts obtained from Lupinus albescens using supercritical carbon dioxide and compressed liquefied petroleum gas

This work presents the extraction yields, kinetic parameters, and composition of extracts obtained from flowers, leaves, stalks, and roots of Lupinus albescens. Different conditions of pressure and temperature were evaluated using supercritical CO2 (150, 200 and 250 bar; 40, 50 and 60 degrees C) and compressed liquefied petroleum gas (LPG) (15, 25 and 30 bar; 25, 35 and 45 degrees C). The spline model was used to determine kinetic parameters for the processes. The highest yield obtained was 1.2 wt.% from the flowers using LPG under 15 bar and 25 degrees C. The roots provided the highest composition of stigmasterol (50.8%) and ergosterol (25.6%) in the extracts obtained by LPG. Other compounds were identified, as tetracosanol, pentadecanoic acid and eicosanol. Thus, this work highlights the possibility of using supercritical CO2 or compressed LPG for obtaining bioactive compounds found in the Lupinus albescens plant.