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Starch in rubbery and glassy states by FTIR spectroscopy
Published Date
21 March 2007, Vol.68(2):249–259, doi:10.1016/j.carbpol.2006.12.015
Title
Starch in rubbery and glassy states by FTIR spectroscopy
Author
Isabelle Capron a,,
Paul Robert a
Paul Colonna a
Maurice Brogly b
Véronique Planchot a
aINRA, Unité de Recherche Biopolymères, Interactions et Assemblages – rue de la géraudière, BP 71 627 – 44316 Nantes Cedex 3, France
bCNRS, Institut de Chimie des Surfaces et Interfaces, 15 rue Jean Starcky, 68057 Mulhouse, France
Received 31 August 2006. Revised 8 December 2006. Accepted 12 December 2006. Available online 23 December 2006.
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 the1065–870cm−1region can be explained by their mobility related to the glass transition,Tg, 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−1intensity ratio. The helix organization at a short order range was weakly moisture dependant belowTg, whereas the signal became increasingly water dependant with the crystalline/amorphous ratio aboveTg. 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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