Synergistic effect of hydrothermal treatment and lauric acid complexation under different pressure on starch assembly and digestion behaviors.

To control starch digestion, debranched high amylose maize starch (dG50) was forced to re-assemble through hydrothermal treatment combined with lauric acid (LA) complexation under high pressure (dG50-LA-HP) and atmospheric pressure (dG50-LA-AP). Both dG50-LA-HP and dG50-LA-AP complexes showed B + V hybrid crystalline structures, but mainly V-type for dG50-LA-AP and apparently B + V-type for dG50-LA-HP. Besides, those two type complexes significantly decreased starch digestibility, and the dG50-LA-HP changed in a higher magnitude since dG50-LA-HP contained more compact and ordered aggregates. The different starch assembly behavior under synergistic effect of hydrothermal treatment and LA complexation combined with different pressure should be responsible for the variation in starch digestibility. The formation of B-type crystallite contributed to the increase of slowly digestible starch, whereas the type I and type II starch-LA inclusion complexes increased the resistant starch fractions. This study offers a novel understanding on starch reassembly under hydrothermal treatment and lipid complexation combined with different pressure.