Processing of defatted meal of forage radish seed with pressurized aqueous ethanol: Glucosinolate removal, phytochemical extraction and obtaining processed meal

Abstract

In this study, pressurized aqueous ethanol (PAE) was used for the processing of defatted meal (DM) obtained from forage radish seeds, aiming to obtain two products: an antioxidant extract and processed defatted meal (PDM). In this context, the effects of the solvent ethanol concentration (25, 50 and 75 wt%) on the global extraction yield (GEY) and chemical nature of the products obtained were investigated. The extraction performed with PAE/75 wt% ethanol provided a lower GEY but reduced the loss of soluble proteins to the extract phase, promoting greater selectivity for the extraction of phenolic compounds, which resulted in an extract with greater antioxidant capacity. The total glucosinolate content of the DM was reduced with the application of PAE. The PDM obtained showed desirable nutritional and functional properties. It was demonstrated that the application of PLE allowed the concomitant production of a detoxified defatted meal rich in proteins, with potential application in human and/or animal food, and an extract rich in phytochemical compounds, which can be applied in the chemical and pharmaceutical industry, promoting the valorization of the by-product of biodiesel production from a non-food raw material, little explored and with great potential.