Document Detail

Effects of structural imperfection on gelatinization characteristics of amylopectin starches with A- and B-type crystallinity.
MedLine Citation:
PMID:  17579479     Owner:  NLM     Status:  MEDLINE    
The aim of the present work was to investigate the effect of physical structures on the properties of starch granules. Starches with a high amylopectin content possessing A- and B-type crystallinity were chosen for the study. The gelatinization temperature decreased in the following order: maize (A) > potato (B) > wheat (A) > barley (A), which did not reflect a correlation with the type of crystallinity. Low values of gelatinization temperature were accompanied with high free surface energy of the crystallites. It is proposed that these data are caused by different types of imperfections in starch crystals. Annealing resulted in an enhancement of the gelatinization temperature and a decrease of the free surface energy of the crystallites for all starches reflecting a partial improvement of crystalline perfection. A limited acid hydrolysis (lintnerization) of the starches decreased the gelatinization temperature because of a partial disruption of the crystalline lamellae and an increase of the amount of defects on the edges of the crystallites. Annealing of the lintnerized starches improved the structure of maize and potato starch, giving them similar structural and physicochemical parameters, which was opposite the behavior of the annealed sample from wheat. The possible nature of removable and nonremovable defects inside the crystalline region of the starch granules is discussed. It is concluded that, besides the allomorphic A- and B-types of crystal packing, physical defects in the crystals possess a major impact on starch gelatinization.
Natalia K Genkina; Jeanette Wikman; Eric Bertoft; Vladimir P Yuryev
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Publication Detail:
Type:  Journal Article     Date:  2007-06-19
Journal Detail:
Title:  Biomacromolecules     Volume:  8     ISSN:  1525-7797     ISO Abbreviation:  Biomacromolecules     Publication Date:  2007 Jul 
Date Detail:
Created Date:  2007-07-09     Completed Date:  2007-10-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100892849     Medline TA:  Biomacromolecules     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2329-35     Citation Subset:  IM    
Institute of Biochemical Physics, RAS, Kosygina st 4, Moscow, Russia.
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MeSH Terms
Amylopectin / chemistry*
Calorimetry, Differential Scanning
Molecular Structure
Reg. No./Substance:
0/Gels; 9037-22-3/Amylopectin

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