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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Effects of sorghum (Sorghum bicolor (L.) Moench) tannins on α-amylase activity and in vitro digestibility of starch in raw and processed flours
Journal of Agricultural and Food Chemistry, Volume 61, No. 18, Year 2013
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Description
The purpose of this study was to investigate the effects of tannins on starch digestion in tannin-containing sorghum extracts and wholegrain flours from 12 sorghum varieties. Extracts reduced amylase activity in a tannin concentration-dependent manner when the extract was mixed with the enzyme before substrate (amylopectin) addition, with higher molecular weight tannins showing greater reduction. Conversely, when the extract and substrate were combined before enzyme addition an enhancement in amylase activity was experienced. In uncooked, cooked, and cooked and stored wholegrain sorghum flours, rapidly digestible, slowly digestible, and resistant starches were not correlated with tannin content or molecular weight distribution. Resistant starch increased from 6.5% to 22-26% when tannins were added to starch up to 50% (starch weight). Tannin extracts both reduced and enhanced amylase activity depending on conditions, and, while these trends were clear in extracts, the effects on starch digestion in wholegrain flours was more complex. © 2013 American Chemical Society.
Authors & Co-Authors
Mkandawire, Nyambe L.
United States, Lincoln
University of Nebraska–lincoln
Zambia, Lusaka
University of Zambia
Kaufman, Rhett C.
United States, Manhattan
Usda Ars Center for Grain and Animal Health Research
Bean, Scott R.
United States, Manhattan
Usda Ars Center for Grain and Animal Health Research
Weller, Curtis L.
United States, Lincoln
University of Nebraska–lincoln
Jackson, David S.
United States, Lincoln
University of Nebraska–lincoln
United States, Lincoln
Agricultural Research Division
Rose, Devin J.
United States, Lincoln
University of Nebraska–lincoln
Statistics
Citations: 6
Authors: 6
Affiliations: 4
Identifiers
Doi:
10.1021/jf400464j
ISSN:
00218561
e-ISSN:
15205118