Abstract
Anthocyanins are natural dietary pigments that could be involved in various health effects. However their mechanisms of absorption are still not fully understood. The aim of this study was to evaluate the influence of glucose on anthocyanin absorption in rats. We first studied anthocyanin bioavailability in rats that received by gastric intubation βΌοΈ53 ΞΌmol cyanidin 3βglucoside (Cy 3βglc) equivalents from a red orange extract with or without 2.51 mmol glucose. Neither 24βh urinary anthocyanin excretion nor plasma anthocyanin concentration was significantly affected by simultaneous ingestion of glucose. The influence of glucose (12, 42 or 72 mM) on intestinal absorption of Cy 3βglc (pure or from a red orange extract; βΌοΈ12.3 ΞΌM) was further studied using an in situ intestinal perfusion model. Absorption of pure Cy 3βglc from the intestinal lumen was not significantly affected by the amount of glucose. However, intestinal absorption of Cy 3βglc from the red orange extract (6.49 Β± 1.44%, n = 6) was significantly less than that of pure Cy 3βglc (17.5 Β± 1.3%, n = 7) (p < 0.01) suggesting that the red orange extract contained other components that were able to interfere with Cy 3βglc intestinal absorption. This study has thus shown that glucose did not interfere with anthocyanin glucoside absorption.