Document Detail

Physical and chemical transformations of cereal food during oral digestion in human subjects.
MedLine Citation:
PMID:  9924264     Owner:  NLM     Status:  MEDLINE    
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 alpha-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.
C Hoebler; A Karinthi; M F Devaux; F Guillon; D J Gallant; B Bouchet; C Melegari; J L Barry
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  The British journal of nutrition     Volume:  80     ISSN:  0007-1145     ISO Abbreviation:  Br. J. Nutr.     Publication Date:  1998 Nov 
Date Detail:
Created Date:  1999-02-04     Completed Date:  1999-02-04     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372547     Medline TA:  Br J Nutr     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  429-36     Citation Subset:  IM    
INRA, Laboratory of Applied Technology and Nutrition, Nantes, France.
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MeSH Terms
Analysis of Variance
Cereals / metabolism*
Digestion / physiology*
Mastication / physiology*
Middle Aged
Oligosaccharides / metabolism
Particle Size
Saliva / metabolism*
Starch / metabolism
Time Factors
Reg. No./Substance:
0/Oligosaccharides; 9005-25-8/Starch

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