Detection Of Adulterated Other Starches In Potato Starch And Preparation Of Potato Starch Crystallite Grain

In this dissertation potato starch was hydrolyzed with dilute sulfuric acid to get potato acid-hydrolyzed crystallite grain. Discern the purity of potato starch by Rapid Visco Analyser and scanning electron microscope. The potato acid hydrolyzed granules was analyzed shape by scanning electron microscope, the crystallinity by X-ray diffraction and fourier transform infrared spectroscopy, particle diameter and the particle size distribution by laser scattering particle analyzer, the viscosity by Rapid Visco Analyser.The swelling power and solubility and transparency were assessed, expecting to provide the theoretical basis of the research and uses of starch crystallite grain.There are three research results:When the purity of potato starch was changed by mixed with corn starch or cassava starch etc. The characteristics of starch solution changed as follow:the peak viscosity was declined, the occurrence of peak viscosity was delayed; the low viscosity was also declined. The Rapid visco analyser integrated with the scanning electron microscope can easy determine the chemical in the white powder. Then we can get the suitable material for the preparation of starch crystallite grain.The study showed that optimal method of preparation of starch crystallite was potato starch in the solution of3.20mol/l sulfuric acid at40℃, Motor speed control100rpm～120rpm,Five days later,the yield of starch crystallite grain about11.28%. The scanning electron microscope showed the potato starch was a smooth surface. The shape of the potato starch was an oval, Particle size and shape was changed.The shape of starch crystallite grain became unsmooth. There are about84.42percent potato starch with size between7.00μm to46.62μm, but the starch crystallite was small then potato starch; about81.73percent of grain about1.52μm to10.07μm.·The scanning electron microscope can easy show that the shape of potato starch crystallite grain also B-type. The characteristics of potato starch crystallite grain was changed significantly. It was show that the peak viscosity falls by97.08%.The solubility and transparency steady decline, the expansive force was increased with the hydrolysis time increasing.