Control: Oil extraction was performed with n-hexane by cross flow extraction at room temperature (25 °C) using a continuous lixiviation apparatus. Ground kernel (300 g) with a particle sizes between 0.5 and 1 mm were charged into the lixiviation vessel (66 cm high × 4 cm diameter) and 5.5 dm3 of the solvent passed through the packed bed. The resulting meal was desolventized under reduced pressure at 30 °C. Walnut flour was obtained by grinding the walnut meal to fine particles, so that 900 g kg−1 of the product passed through a 0.21 mm-mesh screen.