Impact of amylose content on starch physicochemical properties in transgenic sweet potato

Carbohydrate Polymers
Wenzhi ZhouPeng Zhang

Abstract

The intrinsic relationship between amylose content and starch physicochemical properties was studied using six representative starch samples (amylose content 0-65%) produced from transgenic sweet potato (cultivar Xushu22). The transgenic lines (waxy and high-amylose) and wild-type (WT) sweet potatoes were analyzed for amylose content, particle size and chain length distribution, X-ray diffraction analysis, thermal characteristics, pasting and rheological property. Compared to the WT starch, the waxy and high-amylose starches showed larger average granule sizes and had fewer short chains and more medium and long chains. X-ray diffractogram analysis revealed that high-amylose starches show a type-B crystal form with a markedly decreased degree of crystallinity in contrast to the type-A crystal form of the WT and waxy starches. In the high-amylose sweet potato starches, the rise of setback value and the reduction of breakdown value led to the high shear resistance as indicated by the higher G', G", and tanδ from the oscillation test. ΔH was not found to be decreased with the reduction of crystallinity. The shear stress resistance of starch gel after gelatinization was also enhanced as amylose content increased. Principal component...Continue Reading

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Citations

Jun 11, 2019·Journal of Integrative Plant Biology·Wenzhi ZhouPeng Zhang
Apr 19, 2019·Journal of Food Science and Technology·Qi LaiJie Ouyang
Dec 6, 2018·International Journal of Molecular Sciences·Alexandre PoulhazanIsabelle Marcotte
Apr 20, 2021·Journal of the Air & Waste Management Association·Zaber AhmedHamidi Abdul Aziz

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