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Journal of Nutrition and Metabolism
Volume 2016, Article ID 1932532, 9 pages
http://dx.doi.org/10.1155/2016/1932532
Research Article

Inhibition of Intestinal α-Glucosidase and Glucose Absorption by Feruloylated Arabinoxylan Mono- and Oligosaccharides from Corn Bran and Wheat Aleurone

1Department of Food Science, University of Manitoba, Winnipeg, MB, Canada R3T 2N2
2Department of Human Nutrition, University of Manitoba, Winnipeg, MB, Canada R3T 2N2
3Richardson Centre for Functional Foods & Nutraceuticals, University of Manitoba, Winnipeg, MB, Canada R3T 2N2

Received 21 December 2015; Revised 12 February 2016; Accepted 23 February 2016

Academic Editor: Mohammed S. Razzaque

Copyright © 2016 Lovemore Nkhata Malunga et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effect of feruloylated arabinoxylan mono- and oligosaccharides (FAXmo) on mammalian α-glucosidase and glucose transporters was investigated using human Caco-2 cells, rat intestinal acetone powder, and Xenopus laevis oocytes. The isolated FAXmo from wheat aleurone and corn bran were identified to have degree of polymerization (DP) of 4 and 1, respectively, by HPLC-MS. Both FAXmo extracts were effective inhibitors of sucrase and maltase functions of the α-glucosidase. The IC50 for FAXmo extracts on Caco-2 cells and rat intestinal α-glucosidase was 1.03–1.65 mg/mL and 2.6–6.5 mg/mL, respectively. Similarly, glucose uptake in Caco-2 cells was inhibited up to 40%. The inhibitory effect of FAXmo was dependent on their ferulic acid (FA) content ( = 0.95). Sodium independent glucose transporter 2 (GLUT2) activity was completely inhibited by FAXmo in oocytes injected to express GLUT2. Our results suggest that ferulic acid and feruloylated arabinoxylan mono-/oligosaccharides have potential for use in diabetes management.