September
2012
Volume
89
Number
5
Pages
255
—
261
Authors
Yolanda Brummer,1
Ruedi Duss,2
Thomas M. S. Wolever,3 and
Susan M. Tosh1,4
Affiliations
Guelph Food Research Centre, Agriculture and Agri-Food Canada, 93 Stone Road West, Guelph, ON, N1G 5C9 Canada.
CreaNutrition AG, Sumpfstrasse 26, 6301 Zug, Switzerland.
Glycemic Index Laboratories Inc., 20 Victoria Street, Toronto, ON, M5C 2N8 Canada.
Corresponding author. Phone: 519-780-8019. E-mail: Susan.Tosh@agr.gc.ca
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RelatedArticle
Accepted August 2, 2012.
Abstract
ABSTRACT
Oat β-glucan enriched extruded cereals with molecular weights (MWs) ranging from 2,180,000 to 326,000 were produced. Test meals composed of 31 g of available carbohydrate, 8.3–8.7 grams of β-glucan, and milk were administered to subjects and their postprandial blood glucose levels monitored for 2 hr. White bread plus milk and a control wheat bran cereal plus milk were administered, and white bread alone served as a reference food for estimation of glycemic index (GI) of the cereals, after adjusting for the effect of adding milk to white bread. Both oat bran and wheat bran cereals significantly reduced peak blood glucose rise (PBGR) and area under the curve (AUC) versus white bread alone or white bread plus milk. There was a significant inverse relationship between AUC and log10[weight average MW] (r2 = 0.96, P = 0.0192). There was a significant inverse relationship between PBGR and log10[viscosity] of in vitro extracts from all cereals, including the wheat control (r2 = 0.96, P = 0.0031). However, no significant differences in glycemic responses among the oat bran cereals were found with pairwise comparisons. All cereals were low GI (<55) and were significantly lower than white bread alone or white bread plus milk. Among the oat bran cereals, palatability was positively correlated with MW (r2 = 0.98, P = 0.0110).
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© 2012 Department of Agriculture and Agri-Food, Government of Canada