48—THE FRACTIONATION OF STARCH: Part III—THE AMYLOSE-IODINE REACTION

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Abstract
By the use of a much wider range of iodine concentrations than has been used hitherto it has been shown that the absorption of iodine by amylose does not reach a limiting value other than that imposed by the limited solubility of iodine. The view of other workers that the absorption takes place in two stages has, however, been confirmed. In the first stage there is no simple relation between the amount of iodine absorbed and the free iodine concentration but in the second stage the amount of iodine absorbed is a linear function of the logarithm of the free iodine concentration. During the first stage the absorption spectrum of the absorbed iodine remains constant but as soon as the second stage is reached it begins to change in such a way to suggest that the additional iodine is being forced into annylose helices which already contain iodine.