Understanding the mechanism of ultrasonication regulated the digestibility properties of retrograded starch following vacuum freeze drying. (15th January 2020)

• Record Type: Journal Article
• Authors: Ding, Yongbo; Liang, Ying; Luo, Feijun; Ouyang, Qunfu; Lin, Qinlu
• Is Part Of: Carbohydrate polymers. Volume 228(2020)
• Publication Date: 2020-01-15
• Subjects: Ultrasonic treatment -- Resistant starch -- Regulation -- Structural properties -- In vitro digestibility; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2019.115350
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: The digestibility properties of RS3 were regulated by ultrasonication. Ultrasonic treatment (UT) (200 W) enhanced the total amount of SDS and RS up to 73.51%. UT changed the hydrolysis kinetic parameters and enhanced the short-range order. UT-RS3 had a V-type crystalline structure and presented a new exothermic peak. UT induced the rearrangement of molecular chains accompanying structural degradation. Abstract: The digestibility properties and structural changes of retrograded starch (RS3) induced by ultrasonic treatment (UT) were investigated. The digestion profiles showed that UT increased the slowly digestible starch (SDS) or resistant starch (RS) of RS3 as an effective green process, corresponding to a change in hydrolysis kinetic parameters (equilibrium starch hydrolysis percentage and kinetic constant). SEM analysis showed that ultrasound led to breakage of RS3 particles followed by cracking, reorientation and crystallization. Differences in amylose content, granule size, and ζ-potential were found for native RS3 and ultrasound-treated RS3 (UT-RS3). UT decreased the relative crystallinity and gelatinization enthalpy but enhanced short-range order of RS3 based on the results of XRD, DSC, and FT-IR, respectively. Surprisingly, diffractive peaks at 13°and 20° (V-type crystalline structure) and a new exothermic peak were also observed for UT-RS3. The outcome was believed to open new pathways for regulating the digestibility properties of RS3 by UT and development of low glycemic response food.