Moth bean (Vigna aconitifolia) is a drought-resistant legume, cultivated in arid and semi-arid regions of India and Africa. Starch was isolated from moth bean seeds using the wet-milling method and was treated in 2.2 N HCl for durations ranging from 0 to 120 h. Amylose content (18.3%) and swelling power (8.8 g/g) showed progressive decrease with duration in acid treatment. X-ray diffraction showed typical “C” patterns for native and acid-treated starches. Microscopy images revealed an irregular, polygonal structure of the starch granules. Cracks were also observed in the centre of starch granules. Pasting properties showed a drastic decrease of more than 90% in peak viscosity after 4 h of duration and the graph of viscosity versus time almost showed a flat profile after 4 h.
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Singh et al. (2016) studied this question.
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