Time course of α-amylolysis of AP for cluster preparation was conducted according to Kong, Corke, and Bertoft (2009). Clusters of amylopectin were then prepared based on the time-course exper-iment using pre-optimized conditions; 200 mg of AP (10 mg/mL)was hydrolyzed with α-amylase (0.09 U/mL) in a water bath at 25◦Cfor 90 min. The external chains of the clusters were removed byphosphorylase a and β-amylase (Kong et al., 2009). The resulting , _-limit dextrins (¥,β -LD) of the clusters were freeze-dried andthe size distribution of the clusters was analyzed by gel permeation chromatography (GPC) on a column (1.6 cm × 90 cm) of Sepharose CL 6B (GE Healthcare, Uppsala, Sweden) as described elsewhere(Bertoft, 2007).