A method provides for removing oil content from a source material and extracting protein from the source material prior to generating a protein concentrate, including decorticating the source material, the source material having a protein and an oil content therein, the decorticating to remove a cortex from the source material. The method includes creating a flour from the source material having the cortex removed therefrom, removing at least a portion of the oil content from the flour by generating a solvent mixture by mixing the flour with a solvent and extracting a de-oiled flour from the solvent mixture, including oil and sugars extracted from the flour. The solvent may include supercritical CO2, subcritical CO2, ethanol, or a combination thereof. The method includes drying the de-oiled flour using at least one dryer and extracting a protein concentrate from the de-oiled flour.