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Ultrasound‐assisted acid‐thinning of corn starch: Morphological, physicochemical, and rheological properties
Author(s) -
Mohammad Amini Asad,
Razavi Seyed Mohammad Ali
Publication year - 2015
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.201400228
Subject(s) - shear thinning , rheology , sonication , starch , hydrolysis , acid hydrolysis , chemistry , viscosity , chemical engineering , ultrasound , rheometry , materials science , chromatography , food science , composite material , organic chemistry , physics , acoustics , engineering
In the present work, different rheological and physicochemical properties of normal corn starch as affected by different parameters of ultrasound and its simultaneous coupling with acid hydrolysis were studied. The results revealed that sonication and its combination with acid hydrolysis increased solubility of starch granules without destructing crystalline structure, while maximum complex viscosity, breakdown, and activation energy of gelatinisation decreased. Flow behaviour of samples sonicated in acidic solutions experienced a distinct transition from pseudoplastic to Newtonian behaviour. In addition, the gel elasticity, time‐dependency, and structural recovery of samples were diminished. The results of present study would be of great value since ultrasound facilitated production of granular acid‐thinned starch in less than an hour without using any additional chemicals.