Absrtact: The effects of four drying methods, hot air drying, microwave drying equipment, vacuum microwave drying and infrared drying, on the drying time, brightness, microstructure, crystal type, viscosity, condensation stability, freeze-thaw stability and transparency of lotus root starch were studied. The results showed that the X-ray diffraction patterns of Lotus Root Starch Treated by hot air drying, microwave drying, vacuum microwave drying and infrared drying were identical, and the crystal types were B-type.
In hot air drying and infrared drying, starch granules have irregular shape, rough surface, obvious pits, serious agglomeration and cracks among granules, and poor appearance quality. In microwave drying and vacuum microwave drying, the whole structure of large granules is ellipsoid, small granules are spherical, no agglomeration, vacuum microwave drying lotus root starch granules. Complete, clear outline and smooth surface.
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