Estimation of Cellobiase In a test tube1.0 ml of enzyme solution is diluted in citrate buffer(pH 4.8). At least two dilutions are made of each enzyme sample investigated because one dilution should release slightly more and one slightly less than 1.0 mg(absolute amount) of glucose in the reaction conditions, l 0 ml cellobiose stock solution is added to the enzyme solution and mixed well and incubated at 50°C for exactly 30 min. After which the reaction is terminated by immersing the tube in a boiling water bath for exactly 5.0 min. Then the tube is cooled in a cold water bath and the glucose formed is determined spectro by using Glucose oxidase-peroxidase method Ghose 1987)