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Introducing inulin-type fructans

Published online by Cambridge University Press:  08 March 2007

Marcel B. Roberfroid
Affiliation:
Université Catholique de Louvain, 7A rue du Rondia, B-1348, Louvain-La-Neuve, Belgium
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Abstract

Inulin is a generic term to cover all β(2 → 1) linear fructans. Chicory inulin is a linear β(2 → 1) fructan (degree of polymerisation (DP) 2 to 60; DPav = 12), its partial enzymatic hydrolysis product is oligofructose (DP 2 to 8; DPav = 4), and by applying specific separation technologies a long-chain inulin knownas inulin HP (DP 10 to 60; DPav = 25) can be produced. Finally, a specific product known as oligofructose-enriched inulin is obtained by combining chicorylong-chain inulin and oligofructose. Because of the b-configuration of the anomeric C2 in their fructose monomers, inulin-type fructans resist hydrolysis byintestinal digestive enzymes, they classify as ‘non-digestible’ carbohydrates, and they are dietary fibres. By increasing faecal biomass and water content ofthe stools, they improve bowel habits, but they have characteristic features different from other fibres. They affect gastrointestinal functions not because oftheir physico-chemical properties but rather because of their biochemical and physiological attributes. In the colon, they are rapidly fermented to produceSCFA that are good candidates to explain some of the systemic effects of inulin-type fructans. Fermentation of inulin-type fructans in the large bowel is aselective process; bifidobacteria (and possibly a few other genera) are preferentially stimulated to grow, thus causing significant changes in the compositionof the gut microflora by increasing the number of potentially health-promoting bacteria and reducing the number of potentially harmful species. Both oligofructosead inulin are prebiotic. They also induce changes in colonic epithelium stimulating proliferation in the crypts, increasing the concentration ofpolyamines, changing the profile of mucins, and modulating endocrine as well as immune functions. From a nutrition labelling perspective, inulin-typefructans are not only prebiotic dietary fibres; they are also low-calorie carbohydrates [6·3 kJ/g (1·5 kcal/g)]. Supported by the results of a large numberof animal studies and human nutrition intervention trials, the claim ‘inulin-type fructans enhance calcium and magnesium absorption‘ is scientifically substantiated, but different inulin-type fructans have probably a different efficacy (in terms of effective daily dose), the most active product being the oligofructose-enriched inulin. A series of animal studies demonstrate that inulin-type fructans affect the metabolism of lipids primarily by decreasingtriglyceridaemia because of a reduction in the number of plasma VLDL particles. The human data largely confirm the animal experiments. They demonstratemainly a reduction in triglyceridaemia and only a relatively slight decrease in cholesterolaemia mostly in (slightly) hypertriglyceridaemic conditions. Inulinappears thus eligible for an enhanced function claim related to normalization of blood triacylglycerols. A large number of animal data convincingly showthat inulin-type fructans reduce the risk of colon carcinogenesis and nutrition intervention trials are now performed to test that hypothesis in human subjectsknown to be at risk for polyps and cancer development in the large bowel.

Type
Research Article
Copyright
Copyright © The Nutrition Society 2005

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