The importance of amylose and amylopectin fine structures for starch digestibility in cooked rice grains

Syahariza, Z. A., Sar, Seila, Hasjim, Jovin, Tizzotti, Morgan J. and Gilbert, Robert G. (2013) The importance of amylose and amylopectin fine structures for starch digestibility in cooked rice grains. Food Chemistry, 136 2: 742-749. doi:10.1016/j.foodchem.2012.08.053


Author Syahariza, Z. A.
Sar, Seila
Hasjim, Jovin
Tizzotti, Morgan J.
Gilbert, Robert G.
Title The importance of amylose and amylopectin fine structures for starch digestibility in cooked rice grains
Journal name Food Chemistry   Check publisher's open access policy
ISSN 0308-8146
1873-7072
Publication date 2013-01
Year available 2012
Sub-type Article (original research)
DOI 10.1016/j.foodchem.2012.08.053
Volume 136
Issue 2
Start page 742
End page 749
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2013
Language eng
Abstract Statistically and causally meaningful relationships are established between starch molecular structures (obtained by size-exclusion chromatography, proton NMR and multiple-angle laser light scattering) and digestibility of cooked rice grains (measured by in vitro digestion). Significant correlations are observed between starch digestion rate and molecular structural characteristics, including fine structures of the distributions of branch (chain) lengths in both amylose and amylopectin. The in vitro digestion rate tends to increase with longer amylose branches and smaller ratios of long amylopectin and long amylose branches to short amylopectin branches, although the statistical analyses show that further data are needed to establish this unambiguously. These new relationships between fine starch structural features and digestibility of cooked rice grains are mechanistically reasonable, but suggestive rather than statistically definitive.
Keyword Rice
Starch digestibility
Size exclusion chromatography
Molecular structures
Amylose
Amylopectin
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online: 31 August 2012.

 
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