Cyclic and square wave voltammetry of chitooligosaccharides modified by osmium(VI) tetramethylethylenediamine
Language English Country Netherlands Media print-electronic
Document type Journal Article
PubMed
32120319
DOI
10.1016/j.bioelechem.2020.107494
PII: S1567-5394(19)30779-0
Knihovny.cz E-resources
- Keywords
- Aminosaccharides, Chemical modification of carbohydrates, Mercury electrodes, Osmium(VI) complexes, Square wave voltammetry,
- MeSH
- Acetylation MeSH
- Chitin analogs & derivatives chemistry MeSH
- Chitosan MeSH
- Electrochemical Techniques MeSH
- Ethylenediamines chemistry MeSH
- Oligosaccharides MeSH
- Osmium chemistry MeSH
- Oxidation-Reduction MeSH
- Publication type
- Journal Article MeSH
- Names of Substances
- Chitin MeSH
- Chitosan MeSH
- Ethylenediamines MeSH
- N,N,N',N'-tetramethylethylenediamine MeSH Browser
- oligochitosan MeSH Browser
- Oligosaccharides MeSH
- Osmium MeSH
Compounds containing vicinal diol (glycol) groups, including saccharides, could be modified with sixvalent osmium complexes with nitrogenous ligands, particularly with N,N,N',N'-tetramethylethylenediamine (Os(VI)tem). The modification products are electrochemically active. Here we show that aminosaccharides can also be modified by Os(VI)tem. We studied chitosan oligosaccharides in their acetylated and deacetylated form in 0.2 M Na-phosphate, pH 6.9. Deacetylated chitosan oligosaccharides with free amino groups modified by Os(VI)tem yielded two peaks (peak I' at -0.15 V and peak II' at about -0.38 V) despite the fact that these oligomers contain only one glycol group on the non-reducing end of the molecule. The electrochemical behavior of Os(VI)tem modified deacetylated chitosan oligomers differs from Os(VI)tem modified simple saccharides, containing only glycol groups, predominantly in peak I'. Our results suggest that free amino groups are involved in Os(VI)tem modification of chitosan oligomers.
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