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Composition and functional properties of protein isolates obtained from commercial legumes grown in northern Spain

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Abstract

Pea (Pisum sativum), faba bean (Vicia faba) and soybean (Glycine max) seeds were characterized, and protein isolates were prepared following an isoelectric point precipitation procedure. Soybean seeds showed the highest protein content (36.7%) and carbohydrate was the major constituent in the pea (59.4%) and the faba bean seeds (52.1%). Protein contents were higher than 80% in all the protein isolates. The amino acid contents in the protein isolates were, in general, higher than those in their own starting seeds. The antinutritional factor contents were reduced after the protein isolate preparation. The highest reductions achieved for tannins were 95% in the faba bean protein isolate, and for phytates (45%) and trypsin inhibitor activity (46%) in the pea protein isolate. Haemagglutinating activity was not detected in any of the protein isolates. Minimum solubility values were observed at a pH range between 4.0 and 6.0, and maximal solubilities were obtained at basic pH values. The faba bean protein isolate showed the highest water and oil absorption capacities, and the best gelling properties. The soybean protein isolate had the best foam expansion capacity. Thus, the protein isolates had an improvement in some of the characteristics compared to their original seeds with lower contents in tannins, phytates and haemagglutinating activity, but had weak functional properties.

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Authors and Affiliations

  1. Dpt. Nutrition and Food Science, University of País Vasco, Paseo de la Universidad, 7, 01006, Vitoria, Spain

    A. Fernández-Quintela, M. T. Macarulla & A. S. del Barrio

  2. Dpt. Physiology and Nutrition, University of Navarra, Irunlarrea s/n, 31008, Pamplona, Spain

    J. A. Martínez

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  1. A. Fernández-Quintela
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  2. M. T. Macarulla
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  3. A. S. del Barrio
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  4. J. A. Martínez
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Fernández-Quintela, A., Macarulla, M.T., del Barrio, A.S. et al. Composition and functional properties of protein isolates obtained from commercial legumes grown in northern Spain. Plant Foods Hum Nutr 51, 331–341 (1997). https://doi.org/10.1023/A:1007936930354

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