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    In situ study starch gelatinization under ultra-high hydrostatic pressure using synchrotron SAXS

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    Type
    Article
    Authors
    Yang, Zhi
    Gu, Qinfen
    Lam, Elisa
    Tian, Feng
    Chaieb, Saharoui cc
    Hemar, Yacine
    KAUST Department
    Bioscience Program
    Physical Science and Engineering (PSE) Division
    Date
    2015-12-16
    Online Publication Date
    2015-12-16
    Print Publication Date
    2016-05
    Permanent link to this record
    http://hdl.handle.net/10754/584054
    
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    Abstract
    The gelatinization of waxy (very low amylose) corn and potato starches by high hydrostatic pressure (HHP) (up to ∼1 GPa) was investigated in situ using synchrotron small-angle X-ray scattering (SAXS) on samples held in a diamond anvil cell (DAC). The starch pastes, made by mixing starch and water in a 1:1 ratio (by weight), were pressurized and measured at room temperature. During HHP, both SAXS peak areas (corresponding to the lamellar phase) of waxy corn and potato starches decreased suggesting the starch gelatinization increases with increasing pressure. As pressure increased, lamellar peak broadened and the power law exponent increased in low q region. 1D linear correlation function was further employed to analyse SAXS data. For both waxy potato and waxy corn starches, the long period length and the average thickness of amorphous layers decreased when the pressure increased. While for both of waxy starches, the thickness of the crystalline layer first increased, then decreased when the pressure increased. The former is probably due to the out-phasing of starch molecules, and the latter is due to the water penetrating into the crystalline region during gelatinization and to pressure induced compression.
    Citation
    In situ study starch gelatinization under ultra-high hydrostatic pressure using synchrotron SAXS 2015 Food Hydrocolloids
    Publisher
    Elsevier BV
    Journal
    Food Hydrocolloids
    DOI
    10.1016/j.foodhyd.2015.12.007
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S0268005X15301740
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.foodhyd.2015.12.007
    Scopus Count
    Collections
    Articles; Bioscience Program; Physical Science and Engineering (PSE) Division

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