The physicochemical properties of the starch extracted from krajub (Trapa bispinosa Roxb.) were investigated. Scanning electron microscopy of the starch granules showed that they were either oval or round in shape with small horn(s) protruding from the surface. Amylose content of the krajub starch was 29.62% (dry weight basis [dwb]). The pasting temperatures of 6–8% starch suspension were 81–83C. Brabender amylogram showed no peak viscosity and very low breakdown, indicating high heat and shear stability of the starch suspension. The starch pastes highly retrograded and formed an opaque gel. The X-ray diffraction patterns of the starch revealed a C-type crystallite. The starch granules were more resistant to acid hydrolysis (2.2 N HCl at ambient temperature) than mung bean starch (C-type crystallite).
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Tulyathan et al. (2005) studied this question.
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