Czech J. Food Sci., 2010, 28(2):83-93 | DOI: 10.17221/50/2009-CJFS

Texture and pasting properties of ultrasonically treated corn starch

Ivana Ljubić Herceg1, Anet Režek Jambrak2, Drago Šubarić1, Mladen Brnčić2, Suzana Rimac Brnčić2, Marija Badanjak2, Branko Tripalo2, Damir Ježek2, Dubravka Novotni2, Zoran Herceg2
1 Faculty of Food Technology, University of Osijek, Osijek, Croatia
2 Faculty of Food Technology and Biotechnology, University of Zagreb, Zagreb, Croatia

The effects of high power ultrasound of 24 kHz and ultrasound bath of 24 kHz frequency on the textural and pasting properties of corn starch suspensions was examined. Suspensions were treated with different intensities and treatment times (15 min and 30 min) using an ultrasound probe set and bath. The treatments with high power ultrasound probes caused a significant lowering of the starting gelatinisation temperatures of corn starch. The ultrasound treatment caused disruption of starch granules by cavitational forces and made the granules more permeable to water. The highest viscosity was observed for the treatment with 300 W probe. Also, a statistically significant increase in solubility in water (20°C) was observed, being caused by the disruption of starch granules and molecules by ultrasound treatment. When applying more powerful ultrasound, starch granules, specifically in the amorphous region, are much more mechanically damaged. The texture profile analyses of the starch gel prepared from the suspensions that had been treated with ultrasound probe presented higher hardness and higher values of adhesiveness and cohesiveness when compared with untreated suspensions or those treated with ultrasound bath. Micrography showed an obvious impact of ultrasound on the structure of starch granules. Ultrasound treatment ruptures and mechanically damages the starch granules causing collapse of cavitation bubbles which induces high pressure gradients and high local velocities of the liquid layers in their vicinity.

Keywords: corn starch; ultrasound; texture; solubility; pasting

Published: April 30, 2010  Show citation

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Ljubić Herceg I, Režek Jambrak A, Šubarić D, Brnčić M, Rimac Brnčić S, Badanjak M, et al.. Texture and pasting properties of ultrasonically treated corn starch. Czech J. Food Sci. 2010;28(2):83-93. doi: 10.17221/50/2009-CJFS.
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