It has been reported that lipase shows improved activity in the presence of different organic sol- vents [8] possibly by dissolving lipids in the original enzymes. Solvents such as, short-chain alcohols [11], iso-octane [12], hex- ane [13] have been successfully used in enzymatic reactions to get high hydrolysis yields. Kulkarni and Pandit [14], have reported the effect of different solvents like iso-octane, n-hexane, n-heptane and diethyl ether using oil in water type of emulsion. In the present study, the effect of these solvents using water in oil type of emul- sion has been studied. 3 g of castor oil and 1 ml of 1% free enzyme solution were magnetically stirred along with known amount of