Trypsin inhibitor contents of lupin seeds and other grain legumes

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Abstract
Analyses for trypsin inhibitor were carried out on a group of legume seed samples previously evaluated nutritionally in rat growth studies. Sweet lupin seeds (Lupinus albus and L. angustifolius) had no detectable amount of inhibitor (less than 0.1 mg/g). Glycine max (soya beans) had 26.2 mg/g. Phaseolus lunatus (lima beans) and 3 varieties of P. vulgaris had 10-20 mg/g; the variety called pinto beans had an inhibitor level within the range 2.0-3.5 mg/g shown by field peas (Pisum sativum) and broad beans (Vicia faba). Wrinkled garden peas (P. sativum) had less than 1 mg/g which was of the same order of magnitude as commercial, imported soya bean meal and other heat processed soy-bean. Common beans and peas had no detectable trypsin inhibitor after boiling in water for 1 h and freeze-drying.