Article (Scientific journals)
Molecular and Morphological Aspects of Annealing-Induced Stabilization of Starch Crystallites
Gomand, Sara; Lamberts, Lieve; Gommes, Cédric et al.
2012In Biomacromolecules, 13, p. 1361
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Keywords :
Starch; Small-Angle Scattering
Abstract :
[en] A unique series of potato (mutant) starches with highly different amylopectin/amylose (AP/AM) ratios was annealed in excess water at stepwise increasing temperatures to increase the starch melting (or gelatinization) temperatures in aqueous suspensions. Small-angle X-ray scattering (SAXS) experiments revealed that the lamellar starch crystals gain stability upon annealing via thickening for high-AM starch, whereas the crystal surface energy decreases for AM-free starch. In starches with intermediate AP/AM ratio, both mechanisms occur, but the surface energy reduction mechanism prevails. Crystal thickening seems to be associated with the cocrystallization of AM with AP, leading to very disordered nanomorphologies for which a new SAXS data interpretation scheme needed to be developed. Annealing affects neither the crystal internal structure nor the spherulitic morphology on a micrometer length scale.
Disciplines :
Biochemistry, biophysics & molecular biology
Food science
Chemistry
Author, co-author :
Gomand, Sara;  Katholieke Universiteit Leuven - KUL
Lamberts, Lieve;  Katholieke Universiteit Leuven - KUL
Gommes, Cédric  ;  Université de Liège - ULiège > Département de chimie appliquée > Génie chimique - Génie catalytique
Visser, R;  Katholieke Universiteit Leuven - KUL
Delcour, Jan;  Katholieke Universiteit Leuven - KUL
Goderis, Bart;  Katholieke Universiteit Leuven - KUL
Language :
English
Title :
Molecular and Morphological Aspects of Annealing-Induced Stabilization of Starch Crystallites
Publication date :
2012
Journal title :
Biomacromolecules
ISSN :
1525-7797
eISSN :
1526-4602
Publisher :
American Chemical Society, Washington, United States - District of Columbia
Volume :
13
Pages :
1361
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 11 June 2012

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