Retrogradation of autoclaved corn starches: Effect of water content on the resistant starch formation and structure.

In this study, the resistant starch (RS) formation, crystallinity, and double helical order of autoclaved (120 degrees C) normal (ANS) and high amylose (AHS) corn starches retrograded at similar to 4-26% of water content were investigated. ANS and AHS retrograded at similar to 25-26% of water content were more crystalline (similar to 35-40%) and formed by more close-packed double helices (R-100/11022 nm(-1) = 1.145-1.290). The highest content of RS (38.8%) was found in AHS retrograded at 25.52% of water content meanwhile in ANS, the maximum content of RS was 6.6% at 21.60% of water content despite its structural order was increased with the increase of water content. The recrystallization of amylopectin interfered with the formation of homogeneous crystalline structures of amylose preventing the formation of retrograded RS in ANS, while in AHS, a relationship between structure and RS formation was observed, suggesting that the close-packed double helices and the proportion of homogeneous amylose crystallites increased the resistance to enzymatic digestion.