The effect of starch concentration on β-CD production was evaluated in batch stirred-tank reactor (STR) and PBR. In STR, immobilized CGTase at 10 U g starch−1 and 20 mL of starch solution was placed in a jacketed cylindrical vessel (3.2 cm ID, 5.0 cm height) and agitated at 300 rpm. In PBR, immobilized CGTase at 10 U g starch−1 was packed in a jacketed column (1.0 cm ID, 13 cm long). The 20 mL of substrate solution kept in a reservoir was passed through the column and recirculated. The soluble starch dissolved in phosphate buffer (pH 7.0) was varied at different concentrations of 1–10% (w/v). The experiment was carried out at temperature of 50 °C for 72 h. During incubation, a portion of sample was collected every 2 h for measurement of β-CD concentration. The effect of enzyme loading was also investigated in batch mode by varying the amount of immobilized CGTase at 10–50 U g starch−1. The effect of dilution rate (=substrate flow rate per volume of reactor) on β-CD production was evaluated in continuous mode. The suitable concentration of substrate was pumped into the reactor at different flow rates of 7.5–60 mL h−1.