Abstract
With a High Pressure Cell developed by Hartmann, Pfeifer, Dornheim, and Sommer [Chemie Ingenieur Technik 75 (11) (2003) 1763] withstanding a pressure of 300 MPa in combination with an inverse microscope the pressure treatment of wheat starch, tapioca starch and potato starch suspensions for 1 h at 300 MPa was investigated in situ. Images with both high optical resolution and high quality up to pressures of 300 MPa were obtained. The loading of the cell was easy and uncomplicated. Wheat starch granules showed a thorough swelling of most granules during pressurisation. Tapioca starch and potato starch, showing no detectable swelling, were therefore more resistant to pressure than wheat starch. A pressure treatment of iodine stained wheat starch and tapioca starch suspensions resulted in a complete decolouration of the starch granules while pressurised potato starch granules discoloured only slightly.
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