Crystallite orientation maps in starch granules from polarized Raman spectroscopy (PRS) data

Leonardo Galvis, Carlo G. Bertinetto, Jean Luc Putaux, Nicole Montesanti, Tapani Vuorinen

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    Abstract

    In this work, polarized Raman spectroscopy (PRS) was used to determine orientation maps of crystallites present in Phajus grandifolius starch granules based on the anisotropic response of the glycosidic Raman band at 865 cm−1. The response of this band was preliminarily evaluated using model A-amylose crystals as standard. The A‐amylose crystals oriented “in plane” showed a maximal intensity ratio of ∼3.0 for bands 865/1343 cm−1 when the polarization of the laser was along the chain axis of the crystal, i.e., parallel to the axis of the amylose double helices, and a minimal intensity ratio of ∼0.25 when perpendicular. The orientation maps of Phajus grandifolius starch granules showed two distinct regions: one isotropic and the other with a highly anisotropic response. The origin of the difference might be changes in both organization/concentration and orientation of the crystallites across the starch granules.
    Original languageUndefined/Unknown
    Pages (from-to)70-76
    Number of pages7
    JournalCarbohydrate Polymers
    Volume154
    DOIs
    Publication statusPublished - 2016
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Amylose single crystals
    • Polarized Raman spectroscopy
    • Starch granules

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