Spectrophotometric evidence for the formation of short-lived hypomanganate(V) and manganate(VI) transient species during the oxidation of K-carrageenan by alkaline permanganate

Gamal A Ahmed; Ahmed Fawzy; Refat M Hassan

doi:10.1016/j.carres.2007.03.022

Spectrophotometric evidence for the formation of short-lived hypomanganate(V) and manganate(VI) transient species during the oxidation of K-carrageenan by alkaline permanganate

Carbohydr Res. 2007 Jul 23;342(10):1382-6. doi: 10.1016/j.carres.2007.03.022. Epub 2007 Mar 28.

Authors

Gamal A Ahmed¹, Ahmed Fawzy, Refat M Hassan

Affiliation

¹ Department of Chemistry, Faculty of Science, Assiut University, Assiut 71516, Egypt.

PMID: 17445786
DOI: 10.1016/j.carres.2007.03.022

Abstract

Spectrophotometric detection of the formation of short-lived hypomanganate(V), [KCAR-Mn(V)O43-], and manganate(VI), [KCAR-Mn(VI)O42-], intermediates has been confirmed through the oxidation of K-carrageenan (KCAR) by potassium permanganate in alkaline solutions of pH's >or= 12 using a conventional spectrophotometer. The short-lived transient species were characterized and a mechanism consistent with experimental observations is suggested.

MeSH terms

Carrageenan / chemistry*
Carrageenan / classification
Hydrogen-Ion Concentration
Manganese Compounds / chemistry*
Models, Chemical
Oxidation-Reduction
Oxides / chemistry*
Spectrophotometry*
Spectrophotometry, Infrared

Substances

Manganese Compounds
Oxides
permanganic acid
Carrageenan