increases with temperature. This is because the optimum temperature range of the above enzymes ranges between 40 and 55 _C. In comparison with the control sample, the oil yield increases because of the hydrolysis of enzyme. Acid protease has a milder effect on oil extraction than pectinase, but it is stronger than cellulase. Amylase has the least effect. The highest yield of oil is obtained by the addition of complex enzymes. Fig. 3 indicates that the oil in seed kernels of white pitaya may be linked to pectins and
proteins.