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Investigation of the mechanisms affecting Cu and Fe bioavailability from legumes

Role of seed protein and antinutritional (nonprotein) factors

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Abstract

Chemical composition and content in polyphenols, phytic acid, and dietary fiber of whole cooked common bean (Phaseolus vulgaris L.) and faba bean (Vicia faba L.) and of soluble and insoluble fractions separated from them were determined. Simultaneous determination of Cu, Fe, and protein bioavailability in the small intestine of rat was carried out in single-dose, short-term (1 h) experiments. After cooking, about 80% of seed components (on a weight basis) of either legume was recovered in the precipitate (insoluble fraction) after extraction with water. Protein, lipid, starch, dietary fiber, and polyphenols underwent the most severe insolubilization, together with more than 70% of total Cu and Fe. Cu, Fe, and protein bioavailability showed a similar trend (i.e., the lower the protein, the lower the Cu and Fe availability). Availability of proteins, Cu, and Fe in the insoluble fractions were the lowest, but Cu bioavailability was higher than that of Fe in all fractions. The results provide evidence that the heat-induced insolubilization process adversely affects not only protein but also Cu and Fe bioavailability from legumes and that polyphenols are likely to be a major inhibitor on absorption.

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Authors and Affiliations

  1. Istituto Nazionale di Ricerca per gli Alimenti e la Nutrizione, V. Ardeatina 546, 00178, Rome, Italy

    M. Carbonaro, M. Mattera & A. Aguzzi

  2. Rowett Research Institute, Greenburn Road, AB21 9SB, Bucksburn, Aberdeen, Scotland, United Kingdom

    G. Grant & A. Pusztai

Authors
  1. M. Carbonaro
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  2. G. Grant
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  3. M. Mattera
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  4. A. Aguzzi
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  5. A. Pusztai
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Carbonaro, M., Grant, G., Mattera, M. et al. Investigation of the mechanisms affecting Cu and Fe bioavailability from legumes. Biol Trace Elem Res 84, 181–196 (2001). https://doi.org/10.1385/BTER:84:1-3:181

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  • DOI: https://doi.org/10.1385/BTER:84:1-3:181

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