| Dietary raw versus retrograded resistant starch enhances apparent but not true magnesium absorption in rats. | |
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MedLine Citation:
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PMID: 8814214 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Dietary raw (RS2) vs. retrograded resistant starch (RS3) raises apparent magnesium absorption in rats. The mechanism proposed is that RS2 enhances magnesium avaibility for absorption; it does this by increasing ileal solubility of magnesium due to a reduction in pH as a consequence of RS2 fermentation in the gut. The mechanism implies that dietary RS2 vs. RS3 would raise true magnesium absorption and stimulate reabsorption of endogenous magnesium, leading to a lower fecal excretion of endogenous magnesium. Dietary lactulose vs. glucose raises apparent magnesium absorption, and the mechanism proposed is similar to that for the stimulatory effect of RS2 vs. RS3. Thus, we measured in rats fed RS3, RS2, glucose or lactulose true magnesium absorption on the basis of the retention of the orally and intraperitoneally administered radiotracer 28Mg. Feeding rats RS2 instead of RS3 significantly enhanced apparent but not true magnesium absorption, because RS2 lowered fecal excretion of endogenous magnesium. When compared with dietary glucose, lactulose significantly raised both apparent and true magnesium absorption, but did not affect fecal excretion of endogenous magnesium. It is suggested that the proposed mechanism by which RS2 and lactulose would enhance magnesium absorption is disproved by the present data. |
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Authors:
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M L Heijnen; G J van den Berg; A C Beynen |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Journal of nutrition Volume: 126 ISSN: 0022-3166 ISO Abbreviation: J. Nutr. Publication Date: 1996 Sep |
Date Detail:
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Created Date: 1996-10-29 Completed Date: 1996-10-29 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0404243 Medline TA: J Nutr Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 2253-9 Citation Subset: IM |
Affiliation:
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Department of Human Nutrition, Wageningen Agricultural University, The Netherlands. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Absorption
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drug effects,
physiology Animals Body Weight / physiology Diet / standards Dietary Carbohydrates / analysis, pharmacology* Eating / physiology Feces / chemistry Fermentation / physiology Glucose / pharmacology Hydrogen-Ion Concentration Ileum / metabolism, physiology Lactulose / pharmacology Magnesium / analysis, pharmacokinetics*, urine Male Radioisotopes Rats Rats, Wistar Starch / chemistry, pharmacology* |
| Chemical | |
Reg. No./Substance:
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0/Dietary Carbohydrates; 0/Radioisotopes; 4618-18-2/Lactulose; 50-99-7/Glucose; 7439-95-4/Magnesium; 9005-25-8/Starch |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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