Investigating the Attenuation of Starch Hydrolysis by Synergistic Interaction of Xanthan and Guar Gum Fortification during In Vitro Digestion

Aylward, David
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University of Guelph

The effects of a simulated in vitro digestion model on the solution viscosity and ability to reduce the rate of glucose absorption and diffusivity of 0.81%, xanthan, 1.0% guar and 0.86% (80:20 ratio) guar-xanthan-fortified 4% pre-gelatinized starch solutions was examined in this study. Solutions were formulated with comparable apparent viscosities (50-1s) after simulated digestion (without the addition of digestion enzymes) then passed throughout a 30 minute gastric and 2 hour small intestinal simulated digestion protocol. After 60, 90 and 120 min of simulated intestinal digestion, the xanthan gum-treated solution demonstrated a pronounced ability to retain its viscosity after 2 h of simulated intestinal digestion when compared to guar and guar-xanthan. Additionally, despite having dissimilar viscosities, the guar-xanthan and xanthan gum solutions both demonstrated the greatest suppressive effect on glucose release (GOPOD) and diffusion (dialysis) perhaps implying the significance of non-viscosity-related mechanisms influencing the release and diffusivity of glucose.

gaur, xanthan, gum, digestion, starch, hydrolysis, synergy