Microstructural and techno-functional properties of cassava starch modified by ultrasound

• Published in: Ultrasonics sonochemistry Vol. 42; pp. 795 - 804
• Main Authors: Monroy, Yuliana, Rivero, Sandra, García, María A.
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.04.2018
• Subjects: Physical modified starch; Rheological behavior; SEM and CLSM observations; Structural analysis; SEM and CLSM observations; Rheological behavior; Physical modified starch; Structural analysis
• ISSN: 1350-4177; 1873-2828
• DOI: 10.1016/j.ultsonch.2017.12.048

[Display omitted] •Ultrasound treatment induced microstructural changes on cassava starch granules.•The more drastic ultrasound treatment condition led to total starch gelatinization.•FTIR-ATR and DRX results corroborated starch structural disorganization.•Starch ultrasound treatment with ice-bath conditioning enhanced paste stability.•Relationships between microstructural and technological properties were established. This work was focused on the correlation between the structural and techno-functional properties of ultrasound treated cassava starch for the preparation of tailor-made starch-based ingredients and derivatives. Furthermore, the effect of treatment time, sample conditioning and ultrasound amplitude was studied. Ultrasonic treatment of cassava starch induced structural disorganization and microstructural changes evidenced mainly in the morphological characteristics of the granules and in their degrees of crystallinity. These structural modifications were supported by ATR-FTIR and SEM and CSLM studies as well as DRX and thermal analysis. The selection of the processing conditions is critical due to the complete gelatinization of the starch was produced with the maximum amplitude tested and without temperature control. Rheological dynamical analysis indicated changes at the molecular level in starch granules due to the ultrasound treated, revealing the paste stability under refrigeration condition. PCA allow to establish the interrelationships between microstructural and techno-functional properties. In summary, different starch derivatives could be obtained by adjusting the ultrasound treatment conditions depending on their potential applications.