figure 123

clockwise half rotation of wheat starch granules. Wheat starch has a bimodal size distribution with A type - lenticular shaped, large av. 17-20 µm (1) and B type - spherical, small av. 3.9-4.2 µm (2) granules. Wheat starch is birefringent and the large particles show a white ‘Maltezer cross’ in polarised light, under retardation this shape becomes colourised.

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