Produce slowly digestible starch (SDS) was studied by a combination of acetic acid hydrolysis and autoclaving from raw corn starch. Effects of citric acid concentration, acid hydrolysis time, temperature, and refrigeration and retrogradation time on formation of SDS were investigated. Optimal process conditions by Box-Benhnken′s central composite design and response surface analysis was as follows:concentration of acetic acid was3.3%, acid hydrolyzed at 117.5°C for 13.6 min, and then stored at 0°C for 72 h. Under these optimal conditions, content of SDS peaked at 21.03%.
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