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Effect of concentration of iodide on the bound species of I2/I−3 in the amylose-iodine complex

✍ Scribed by Hirofumi Yajima; Takeshi Nishimura; Tadahiro Ishii; Takashi Handa

Publisher
Elsevier Science
Year
1987
Tongue
English
Weight
859 KB
Volume
163
Category
Article
ISSN
0008-6215

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✦ Synopsis

A liquid-liquid distribution method, with heptane as the organic solvent, involving evaluation of the concentration of free I-by magnetic circular dichroism, has been developed for determining the bound amounts of 12/1< in the amyloseiodine complex in unbuffered aqueous solutions. The effect of Iz and I-concentrations on the bound species of iodine in the complex was investigated by using this method. We found that the stoichiometric bound species of It/I; is independent of the concentration of 1~ at a given I-concentration. However, the bound species strongly depends on I-concentration, and varies from I; at 1OmM KI to Ifi at OM KI. Moreover, the number of D-glucosyl residues required for including one iodine atom is within the range of 2.7 to 3.0, regardless of I-concentration. It was concluded that the bound species are governed by the distribution of the actual species Iz-I2 &), Iz.I; (I;), and If-13 (I:-), which are responsible for the blue color of the complex.

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