TRYPSIN-INHIBITOR CONTENTS OF LUPIN SEEDS AND OTHER GRAIN LEGUMES

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 three 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 soya bean. Common beans and peas had no detectable trypsin inhibitor after boiling in water for 1 h and freeze-drying. © 1979 Taylor & Francis Group, LLC.