Multiple forms of a glucoamylase inhibitory factor fromAspergillus niger and its elution after adsorption onto raw wheat starch

An inhibitory factor (IF) fromAspergillus niger, that inhibited the action of glucoamylase on raw starch, was adsorbed tightly onto raw starch but was almost completely desorbed by 0.02m sodium borate. The IF was a glycoprotein and was partially purified by ion exchange chromatography into three active fractions.