Evaluation of the impact of a rat small intestinal extract on the digestion of four different functional fibers
Gallego-Lobillo, Pablo | Ferreira-Lazarte, Alvaro | Hernández-Hernández, Oswaldo | Montilla, Antonia | Villamiel, Mar
The degree of digestion, modulated by rat small intestinal extract on different functional fibers was investigated. In general, inulin-type fructans and fructooligosaccharides were the most resistant to the enzymatic digestion. Results evidenced the high-resistance of fructosyl-fructose bonds. This fits well with the concept of prebiotic carbohydrates. However, the mixture of melibiose, manninotriose and verbascotetraose (α-GOS) from peas, with a considerably lower molecular weight (0.6 kDa) than the fructans studied, were highly digested (61.2%). Interestingly, the Gal-(1 → 6)-Gal bonds present into the manninotriose and verbascotetraose were more prone to be hydrolyzed than Gal-(1 → 6)-Glc (melibiose). However, when melibiose was the only disaccharide present in the reaction mixture, the hydrolysis was also high (67.7%). The use of small intestinal enzymatic preparations is a realistic approximation to evaluate the digestion of different carbohydrates, thus, showing that recognized non-digestible carbohydrates can also be partially digested.
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