Castor seed paste (40 g) was wrapped in a clean muslin cloth and placed in the thimble that was inserted in the center of the Soxhlet extractor. A round bottom flask was filled with 50 mL of hexane that had been weighed. After 3 hours of extraction, the sample was dried at 60 o C to remove residual solvent and weighed to determine the oil yield extracted using Equation ( )