Pretreatment of milk with either sodium or calcium polystyrene sulfona
te resins is useful in limiting potassium dietary intake in children w
ith renal failure. We therefore studied the in vitro effects of Kayexa
late and Calcium Sorbisterit on potassium, sodium and calcium concentr
ations in 3 standard formulas and in human milk. It is concluded that
wide variations in the final potassium, sodium and calcium concentrati
ons can be observed according to the resin but also to the formula.