Complex formation with starch Hydrophilic sugar esters (high HLB values) are effective as a quality improver in foods consisting mainly of wheat flour. Sugar esters combine with starch in a form where the helical structure of the starch envelops the fatty acid group of sugar ester. 3. Triiodide ions react with starch to form a blue complex of starch and pentaiodide 2I3-(aq) + starch —> starch-I-5- complex + I-(aq) Mechanism The reason for the sudden color change from colorless to blue, stems from the fact that the first two reactions have very different rates, such that k2>>k1. Thus, no I3- ions can be found free in ...

Polyiodides are characterized by their highly complex and variable structures, and can be considered as associations of I 2, I −, and I− 3 units. Discrete polyiodides are usually linear, reflecting the origin of the ion. The more complex two- or three-dimensional network structures of chains and cages are formed as... May 06, 2016 · Third Reaction I3 - + starch → Starch-I5 - complex + I− After all the thiosulfate ions have been consumed by reaction 2, the triiodide ions react with the starch to form the starch- pentaiodide complex. This product is what gives the solution the dark blue color. Environmental, Health, and Safety • Emission free vehicle!