Abstract
The kinetics of formation of intermediate complexes during the oxidation of iota- and lambda-carrageenan sulfated polysaccharides (CAR) as natural polymers by alkaline permanganate at pH's ≥12 have been investigated using a conventional spectrophotometer. The reactions showed first-order dependences in permanganate and fractional-first-order kinetics with respect to carrageenans concentration. Kinetic and spectrophotometric evidences revealed the formation of intermediate complexes involving green manganate (VI) and/or blue hypomanganate (V) short-lived transient species. The influence of pH on the oxidation rates indicated that the formation of complexes is base-catalyzed. The kinetic parameters have been evaluated and mechanisms consistent with the experimental results are discussed.
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