Spectrophotometric evidence for the formation of hypomanganate(V), [CAR-MnVO4
3], and manganate(
VI), [CAR-MnVIO4
2], intermediate complexes has been confirmed during the oxidation of iotaand
lambda-carrageenan-sulfated polysaccharides (CAR) by alkaline permanganate at pHs P12 using a
conventional spectrophotometer. These short-lived intermediate complexes were identified and characterized.
A reaction mechanism in good consistence with the experimental results is suggested.