Journal
FOOD RESEARCH INTERNATIONAL
Volume 42, Issue 7, Pages 840-846Publisher
ELSEVIER
DOI: 10.1016/j.foodres.2009.03.010
Keywords
Dietary fiber; Analytical method; Resistant protein; Associated polyphenols; Plant food; Beverages
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Funding
- Spanish Ministry of Education and Science Project [AGL 2005-04769]
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The analytical dietary fiber (DF) methods most widely used today were developed to determine non-starch polysaccharides and lignin. Updated dietary fiber definition includes all indigestible plant food constituents. Recent methods have proposed the measurement of resistant starch and oligosaccharides, but other major indigestible constituents such as polyphenolic compounds and resistant protein are still omitted in dietary fiber analysis. There is scientific evidence that an appreciable amount of dietary polyphenols are associated with the dietary fiber matrix, being a fermentable substrate for bacterial microflora. The objective of this work was to show polyphenols compounds are major constituents of dietary fiber and to propose a procedure for their measurement. Results showed that polyphenols are major constituents of DF, accounting from 1.4% to 50.7% (dry weight) of insoluble dietary fiber in plant foods and from 2.9% to 62.8% of soluble dietary fiber in common beverages. (C) 2009 Elsevier Ltd. All rights reserved.
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