The variation in content and changes during development of soyasaponin I in dehulled Swedish peas (Pisum sativum L) were investigated. The content of soyasaponin I in 40 dehulled pea samples ranged from 0·82 to 2·5 g kg-1 with a mean of 1·5 g kg-1. No significant differences in soyasaponin content were found between light- and dark-coloured peas. No soyasaponin I was found in the hulls. The content of soyasaponin I in the dehulled peas decreased considerably during maturation. Two light-coloured varieties had a higher initial content and a much more pronounced decrease during development than a dark-coloured variety.
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Daveby et al. (1997) studied this question.