Constitution of leguminous seeds. A note on protein‐phytic acid interactions during isolation of acid‐soluble protein from phaseolus beans

Acid‐soluble proteins isolated from three types of Phaseolus beans (white kidney beans, navy beans and lima beans) were found to contain phytic acid. The amount of phytic acid complexed by the proteins was unaffected by the phytic acid content of the bean extracts from which the proteins were isolated but depended on the number of positively charged basic groups which were available for reaction with the phytate anion. It was found that the Neuberg formula for phytic acid (C6H24O27P6) represents more accurately the molecular formula of phytic acid associated with the isolated proteins, than does the Anderson formula (C6H18O24P6).