A- and B-Type Crystalline Forms in Aggregates and Solidified Materials Prepared from Short Linear Maltodextrin

Abstract

Short linear maltodextrin (SLMD) is a novel maltodextrin synthesized from starch using the combined enzymatic actions. SLMD exhibits unique aggregating and solidifying properties. In this study, we prepared SLMD aggregates, solidified materials under various conditions, and investigated their crystallinity. Aggregates formed in the 50 % SLMD solution at 4 °C (AGG-4), 25 °C (AGG-25), and 50 °C (AGG-50) showed clear X-ray diffraction peaks. A B-type crystal diffraction pattern was observed for AGG-4, whereas an A-type pattern was observed for AGG-25 and AGG-50. Kneading SLMD with a limited quantity of water produced solidified slurries at 4 °C (SS-4) and 25 °C (SS-25). SS-4 exhibited a C-type structure with low crystallinity, whereas SS-25 showed an A-type structure with high crystallinity. In addition, B-type crystals were detected in the aggregates in the emulsions solidified with vegetable oil. Therefore, SLMD crystals occurred in different forms in the aggregates or solidified bodies under various conditions.