Document Detail


Changes in starch physical characteristics following digestion of foods in the human small intestine.
MedLine Citation:
PMID:  20412607     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Factors controlling the concentration of resistant starch (RS) in foods are of considerable interest on account of the potential for this type of fibre to deliver health benefits to consumers. The present study was aimed at establishing changes in starch granule morphology as a result of human small-intestinal digestion. Volunteers with ileostomy consumed six selected foods: breakfast cereal (muesli), white bread, oven-baked French fries, canned mixed beans and a custard containing either a low-amylose maize starch (LAMS) or a high-amylose maize starch (HAMS). Analysis showed that digesta total RS (as a fraction of ingested starch) was: muesli, 8.9 %; bread, 4.8 %; fries, 4.2 %; bean mix, 35.9 %; LAMS custard, 4.0 %; HAMS custard, 29.1 %. Chromatographic analysis showed that undigested food contained three major starch fractions. These had average molecular weights (MW) of 43,500 kDa, 420 kDa and 8.5 kDa and were rich in amylopectin, higher-MW amylose and low-MW amylose, respectively. The low-MW amylose fraction became enriched preferentially in the stomal effluent while the medium-MW starch fraction showed the greatest loss. Fourier transform IR spectroscopy showed that absorbance at 1022 per cm decreased after digestion while the absorbance band at 1047 per cm became greater. Such changes have been suggested to indicate shifts from less ordered to more ordered granule structures. Further analysis of amylose composition by scanning iodine spectra indicated that the MW of amylose in ileal digesta was lower than that of undigested amylose. It appears that high-MW amylose is preferentially digested and that MW, rather than amylose content alone, is associated with resistance of starch to digestion in the upper gut of humans.
Authors:
Zhongkai Zhou; David L Topping; Matthew K Morell; Anthony R Bird
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-04-23
Journal Detail:
Title:  The British journal of nutrition     Volume:  104     ISSN:  1475-2662     ISO Abbreviation:  Br. J. Nutr.     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-08-17     Completed Date:  2010-09-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0372547     Medline TA:  Br J Nutr     Country:  England    
Other Details:
Languages:  eng     Pagination:  573-81     Citation Subset:  IM    
Affiliation:
Food Futures National Research Flagship, CSIRO Food and Nutritional Sciences, Kintore Avenue, Adelaide 5000, Australia.
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Aged, 80 and over
Amylopectin / chemistry*,  metabolism
Amylose / chemistry*,  metabolism
Dietary Carbohydrates / metabolism*
Digestion*
Female
Humans
Ileostomy
Intestine, Small / metabolism*
Male
Middle Aged
Molecular Structure
Spectroscopy, Fourier Transform Infrared
Spectrum Analysis
Chemical
Reg. No./Substance:
0/Dietary Carbohydrates; 9005-82-7/Amylose; 9037-22-3/Amylopectin

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