Cyclic and square wave voltammetry of chitooligosaccharides modified by osmium(VI) tetramethylethylenediamine

0536414 - BFÚ 2021 RIV CH eng J - Journal Article
Trefulka, Mojmír - Ostatná, Veronika
Cyclic and square wave voltammetry of chitooligosaccharides modified by osmium(VI) tetramethylethylenediamine.
Bioelectrochemistry. Roč. 133, č. 2020 (2020), č. článku 107494. ISSN 1567-5394. E-ISSN 1878-562X
R&D Projects: GA ČR(CZ) GA18-18154S
Institutional support: RVO:68081707
Keywords : ligand complexes * nucleic-acids * chitosan * chitin * oligosaccharides * polysaccharides * chemistry
OECD category: Biochemistry and molecular biology
Impact factor: 5.373, year: 2020
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S1567539419307790?via%3Dihub

Compounds containing vicinal diol (glycol) groups, including saccharides, could be modified with sixvalent osmium complexes with nitrogenous ligands, particularly with N,N,N',N'-tetramethylethylenedia mine (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' at0.15 V and peak II' at about0.38 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. (C) 2020 Elsevier B.V. All rights reserved.
Permanent Link: http://hdl.handle.net/11104/0314181