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Physical and chemical transformations of cereal food during oral digestion in human subjects

  • C. Hoebler (a1), A. Karinthi (a1), M.-F. Devaux (a1), F. Guillon (a1), D. J. G. Gallant (a1), B. Bouchet (a1), C. Melegari (a2) and J.-L. Barry (a1)
  • DOI:
  • Published online: 01 March 2007

Chemical and physical transformations of solid food begin in the mouth, but the oral phase of digestion has rarely been studied. In the present study, twelve healthy volunteers masticated mouthfuls of either bread or spaghetti for a physiologically-determined time, and the levels of particle degradation and starch digestion before swallowing were compared for each food. The amounts of saliva moistening bread and spaghetti before swallowing were, respectively, 220 (SEM 12) v. 39 (SEM 6) g/kg fresh matter. Particle size reduction also differed since bread particles were highly degraded, showing a loss of structure, whereas spaghetti retained its physical structure, with rough and incomplete reduction of particle size. Starch hydrolysis was twice as high for bread as for spaghetti, mainly because of the release of high-molecular-mass α-glucans. The production of oligosaccharides was similar after mastication of the two foods, respectively 125 (SEM 8) and 92 (SEM 7) g/kg total starch. Starch hydrolysis, which clearly began in the mouth, depended on the initial structure of the food, as in the breakdown of solid food. These significant physical and chemical degradations of solid foods during oral digestion may influence the entire digestive process.

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*Corresponding author:Dr Christine Hoebler, fax +33 2 40675012, email
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