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Short-chain fatty a...
Short-chain fatty acid content and pH in caecum of rats given various sources of carbohydrates
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- Berggren, Anna (author)
- Lund University
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- Björck, Inger (author)
- Lund University,Lunds universitet,Centrum för preventiv livsmedelsforskning, Medicon Village,Universitetets särskilda verksamheter,Food for Health Science Centre, Medicon Village,University Specialised Centres
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- Nyman, Margareta (author)
- Lund University,Lunds universitet,Avdelningen för livsmedel och läkemedel,Institutionen för processteknik och tillämpad biovetenskap,Institutioner vid LTH,Lunds Tekniska Högskola,Division of Food and Pharma,Department of Process and Life Science Engineering,Departments at LTH,Faculty of Engineering, LTH
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- Eggum, Bjørn O. (author)
- National Institute of Animal Science, Denmark
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(creator_code:org_t)
- Wiley, 1993
- 1993
- English 10 s.
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In: Journal of the Science of Food and Agriculture. - : Wiley. - 0022-5142 .- 1097-0010. ; 63:4, s. 397-406
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Abstract
Subject headings
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- The caecal content of short‐chain fatty acids (SCFA; acetic, propionic and butyric acid), caecal pH, fermentability and dry matter digestibility (DMD) were examined through balance experiments in rats fed 11 various indigestible carbohydrates. The following carbohydrate sources were incorporated into test diets: cellulose, oat husk, wheat bran, oat bran, pea fibre, linseed fibre, low methoxylated (LM)‐pectin, guargum, β‐glucans, neosugar and raffinose. The indigestible carbohydrates, except for those in wheat bran, oat husk and cellulose, were highly fermented, ie > 90%. Caecal pH varied between 5·6 and 7·8, with neosugar and raffinose causing the lowest pH and the fibre‐free diet and the diet with oat husk the highest. The caecal pool sizes of SCFA were highest with raffinose, β‐glucans, LM‐pectin, guargum and linseed fibre (335‐400 μmol) while pea fibre, wheat bran, oat bran and neosugar gave intermediate levels (137–227 μmol). The pool size with oat husk and cellulose was similar as with the basal diet (45–64 μmol). A high proportion of propionic acid was obtained with guargum and linseed fibre, whereas acetic acid was the predominant product in case of LM‐pectin. On the other hand, linseed fibre gave a remarkably low proportion of butyric acid. The quantity fermented and caecal pH correlated well to the amount of SCFA with most materials (r = 0·96 and r = −0·87, respectively), an exception was neosugar and in case of fermentability also oat bran. DMD values with most of the easily fermented carbohydrates were high (>96%). Exceptions were diets with β‐glucans and oat bran which caused low DMD values, about 93%. It is concluded that indigestible carbohydrates may differ in ability to lower caecal pH and to form SCFA during fermentation.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Annan teknik -- Livsmedelsteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Other Engineering and Technologies -- Food Engineering (hsv//eng)
Keyword
- caecal pH
- dietary fibres
- dry matter digestibility
- fermentation
- oligosaccharides
- rat experiments
- short‐chain fatty acids
Publication and Content Type
- art (subject category)
- ref (subject category)
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