Document Detail

The effect of the undigested fraction of maize products on the activity and composition of the microbiota determined in a dynamic in vitro model of the human proximal large intestine.
MedLine Citation:
PMID:  20516265     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To investigate the effect of 5 newly developed maize-based fibers on the activity and composition of the microbiota in the colon. The fibers tested were glucose-based and had variable structures, including 2 resistant starch preparations, soluble corn fiber, pullulan, and soluble fiber dextrin. METHODS: The fibers were predigested, mono- and disaccharides were removed, and the residual polymer was used to assess the production of microbial metabolites and changes in composition of the microbiota using a dynamic, validated, in vitro model of the large intestine. RESULTS: Microbial metabolite analysis showed an increase in short-chain fatty acids for all fibers, with varying levels of butyrate production for each fiber. The greatest increase of butyrate, both in terms of absolute amounts and as a proportion of total short-chain fatty acids, was observed for pullulan. All fibers also reduced toxic metabolites from protein fermentation compared to the poorly fermentable control (cellulose). Microbial composition was assessed using a micro-array platform. All fibers showed increases of bifidobacteria and some Lactobacillus species, although different species were stimulated by different fibers. Pullulan showed the largest increase of bifidobacteria. CONCLUSIONS: All fibers showed prebiotic activity in terms of increases in growth and/or activity of beneficial microbes. In addition, compared to the control, health-promoting metabolites were produced in higher amounts, while putrefactive metabolites were reduced for all fibers. The importance of the findings lies in the fact that the newly developed, maize-based fibers shift the intestinal environment to a healthier milieu, with increased health-promoting metabolites and health-beneficial microbes.
Annet Maathuis; Andrew Hoffman; Annette Evans; Lisa Sanders; Koen Venema
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of the American College of Nutrition     Volume:  28     ISSN:  1541-1087     ISO Abbreviation:  J Am Coll Nutr     Publication Date:  2009 Dec 
Date Detail:
Created Date:  2010-06-02     Completed Date:  2010-08-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8215879     Medline TA:  J Am Coll Nutr     Country:  United States    
Other Details:
Languages:  eng     Pagination:  657-66     Citation Subset:  IM    
Department of Biosciences, TNO Quality of Life, P3700 AJ Zeist, The Netherlands.
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MeSH Terms
Bifidobacterium / metabolism
Digestion / physiology*
Intestine, Large / metabolism*,  microbiology*
Zea mays / metabolism*

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