title: High-pressure potato starch granule gelatinization: synchrotron radiation micro-SAXS/WAXS using a diamond anvil cell.
abstract: Potato starch granules have been examined by synchrotron radiation small- and wide-angle scattering in a diamond anvil cell (DAC) up to 750 MPa. Use of a 1 microm synchrotron radiation beam allowed the mapping of individual granules at several pressure levels. The data collected at 183 MPa show an increase in the a axis and lamellar period from the edge to the center of the granule, probably due to a gradient in water content of the crystalline and amorphous lamellae. The average granules radius increases up to the onset of gelatinization at about 500 MPa, but the a axis and the lamellar periodicity remain constant or even show a decrease, suggesting an initial hydration of amorphous growth rings. The onset of gelatinization is accompanied by (i) an increase in the average a axis and lamellar periodicity, (ii) the appearance of an equatorial SAXS streak, and (iii) additional short-range order peaks.
authors.affiliation: European Synchrotron Radiation Facility, Grenoble Cedex, France.
authors.forename: R
authors.initials: R
authors.lastname: Gebhardt
authors.forename: M
authors.initials: M
authors.lastname: Hanfland
authors.forename: M
authors.initials: M
authors.lastname: Mezouar
authors.forename: C
authors.initials: C
authors.lastname: Riekel
mesh_terms: D005780:Gelatin / Q000737:chemistry*; D008853:Microscopy; D011198:Solanum tuberosum / Q000737:chemistry*; D013213:Starch / Q000737:chemistry*; D017356:Synchrotrons; D014961:X-Ray Diffraction
chemical_list: D005780:Gelatin; D013213:Starch