Soybean (Glycine max (L) Merril) seeds are known to contain different proteins displaying antinutritional and/or toxic effects, such as soybean agglutinin (an N‐acetylgalactosamine‐specific lectin), proteinase inhibitors (Kunitz‐ and Bowman–Birk‐type trypsin and chymotrypsin inhibitors) and urease (seed and tissue isoforms). Two other toxic proteins were previously isolated from soybeans, soyatoxin (21 kDa) and soybean toxin (18.4 kDa), which are immunologically related to canatoxin, a toxic protein from Canavalia ensiformis (jackbean) seeds. In this work we have screened crude extracts from seeds of six different soybean cultivars, which together represent most of the crop harvested in the southern region of Brazil, for the presence of urease, trypsin inhibitory and haemagglutination activities, intraperitoneal toxicity in mice and immunoreactivity against anti‐canatoxin antibodies. Significant differences were found in the contents of proteinase inhibitors, lectin, urease activity and lethality in mice. The relevance of these findings to the agronomic qualities and to the choice of soybean cultivars to be used as food or feed is discussed. Copyright © 2004 Society of Chemical Industry
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Document Type: Research Article
Department of Biophysics, and Programa de Pós-Graduação em Biologia Celular e Molecular, Universidade Federal do Rio Grande do Sul, CEP 91509-900 Porto Alegre, RS, Brazil
Department of Biochemistry and Molecular Biology, Universidade Federal do Ceará, Campos do PICI, CEP 60451-970 Fortaleza, CE, Brazil
February 1, 2004
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