a-Amylase is an important industrial enzyme, mainly used
in food industry for starch liquefaction process. The enzyme used in this process can suffer a lack of long-term operational stability and difficulty in recovery. a-Amylase immobilized onto ion-exchange resin beads showed better stability, and time required for starch liquefaction was improved significantly Another thermostable a-amylase from Bacillus licheniformis was immobilized by six different cross-linked enzyme aggregates for starch liquefaction. Among all, tertbutanol used as precipitant showed best performance for starch liquefaction. Immobilization technique