抄録
An amperometric modification of the potentiometric determination of starch-iodine affinity by Bates et al. has been developed. The procedure is essentially the same as that of the poten-tiometric method, but free iodine is determined amperometrically by using a rotating platinum electrode as an indicating electrode without the application of an external e. m. f. This method is of special advantage for routine work, since a sharp and exact end point is obtained. The amperometric titration curve can also easily be converted into the iodine affinity curve, which has been recommended as an exact method to evaluate the iodine-binding capacity of starchy materials. Using this technique, the iodine affinities of some starchy materials and their change during β-amylolysis are determined, successfully.
