Biospecific or non-specific adsorption of amylase on starch in Starkenstein's experiments (1910)?

A paper by Starkenstein on the influence of chloride on the enzymatic activity of liver amylase, including a description of the adsorption of the enzyme on starch, is discussed with reference to the early concepts of enzyme-substrate binding and to later work on specific adsorption of amylase on starch.