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Starch in rubbery and glassy states by FTIR spectroscopy

Abstract : The organization of various starch samples varying in molecular structure, organization and moisture content was studied by ATR-FTIR spectroscopy. The comparison of the infrared spectra showed that band intensities in the 1065-870 cm(-1) region can be explained by their mobility related to the glass transition, T-g, which occurs at room temperature in the 15-21% water content range. Spectra analyzed using principal component analysis showed main structure/moisture changes for the 1000/1022 cm(-1) intensity ratio. The helix organization at a short order range was weakly moisture dependant below T-g, whereas the signal became increasingly water dependant with the crystalline/amorphous ratio above T-g. This result is in agreement with the model of liquid crystal structure and mesophase variation: water allows the self-assembly of amylopectin helices leading to layered organized structure.
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Submitted on : Sunday, May 31, 2020 - 9:51:23 AM
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Isabelle Capron, Paul Robert, Paul Colonna, Maurice Brogly, Veronique Planchot. Starch in rubbery and glassy states by FTIR spectroscopy. Carbohydrate Polymers, Elsevier, 2007, 68, pp.249-259. ⟨10.1016/j.carbpol.2006.12.015⟩. ⟨hal-02667004⟩



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