Nutritional evaluation of RAZ-2, a new Phaseolus vulgaris bean cultivar containing high levels of the natural insecticidal protein arcelin 1

Pusztai, A.; Grant, G.; Stewart, J.C.; Bardocz, S.; Ewen, S.W.B.; Gatehouse, A.M.R.

Nutritional evaluation of RAZ-2, a new Phaseolus vulgaris bean cultivar containing high levels of the natural insecticidal protein arcelin 1

1993

The nutritional properties of RAZ-2, a recently developed bean (Phaseolus vulgaris) line which, because of its high levels of the natural insecticidal protein arcelin 1 and low content of toxic lectin, PHA, is highly resistant to attack by bean weevils, have been studied with rats. Raw RAZ-2 bean was nontoxic but, as its proteins were less digestible and less well utilized than those of high-quality animal proteins and because of its stimulation of the growth of the gut and pancreas and increased lipolysis, growth of the rats was somewhat retarded. However, although the nutritional value of raw RAZ-2 bean was slightly below that expected from its chemical composition and low PHA content, the antinutritional effects of this line are less than those with most bean varieties. The toxicity of arcelin 1 is thought to be mainly directed against insects, but it is possible that arcelins may also contribute to the reduced but slightly deleterious effects of these raw beans. However, similar to the improvement of nutritional value in other bean cultivars, most of the antinutritive properties of RAZ-2 could be abolished by heating the fully hydrated beans at 100 degrees C for 10 min.

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