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Journal articles
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.
https://hal.inrae.fr/hal-02667004
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Submitted on : Sunday, May 31, 2020 - 9:51:23 AM
Last modification on : Thursday, January 13, 2022 - 3:12:02 PM
Contributor : Migration Prodinra Connect in order to contact the contributor
Submitted on : Sunday, May 31, 2020 - 9:51:23 AM
Last modification on : Thursday, January 13, 2022 - 3:12:02 PM
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