A
Alexander S. Shashkov
Researcher at Russian Academy of Sciences
Publications - 843
Citations - 14752
Alexander S. Shashkov is an academic researcher from Russian Academy of Sciences. The author has contributed to research in topics: Gene cluster & Escherichia coli. The author has an hindex of 49, co-authored 819 publications receiving 13381 citations. Previous affiliations of Alexander S. Shashkov include National University of Ireland, Galway & Stockholm University.
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Journal ArticleDOI
A computer-assisted structural analysis of regular polysaccharides on the basis of 13C-n.m.r. data.
Grigory M. Lipkind,Alexander S. Shashkov,Yuriy A. Knirel,Evgeny V. Vinogradov,Nikolay K. Kochetkov +4 more
TL;DR: A computerised approach to the structural analysis of unbranched regular polysaccharides is described, which is based on an evaluation of the 13C-n.r.m. spectra for all possible primary structures within the additive scheme starting from the chemical shifts of the13C resonances of the constituent monosaccharides and the average values of the glycosylation effects.
Journal ArticleDOI
Structure of a fucoidan from the brown seaweed Fucus evanescens C.Ag.
Maria I. Bilan,Alexey A. Grachev,Nadezhda E. Ustuzhanina,Alexander S. Shashkov,Nikolay E. Nifantiev,Anatolii I. Usov +5 more
TL;DR: A fucoidan consisting of L-fucose, sulfate and acetate in a molar proportion of 1:1.23:0.36 was isolated from the Pacific brown seaweed Fucus evanescens, and the structures of its desulfated and de-O-acetylated derivatives were investigated by 1D and 2D (1)H and (13)C NMR spectroscopy.
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Stereochemical factors determining the effects of glycosylation on the 13C chemical shifts in carbohydrates
TL;DR: In this paper, basic stereochemical factors have been revealed which affect the 13C chemical shifts in glycosides with a chiral cyclohexane-type aglycone and in disaccharides with an Aglycone.
Journal ArticleDOI
A study of fucoidan from the brown seaweed Chorda filum.
Alexander O. Chizhov,Anne Dell,Howard R. Morris,Stuart M. Haslam,Roy A. McDowell,Alexander S. Shashkov,Nikolay E. Nifant'ev,Elena A. Khatuntseva,Anatolii I. Usov +8 more
TL;DR: Other fucoidan fractions from C. filum have more complex carbohydrate composition and give rather complex methylation patterns, which correspond to a quasiregular polysaccharide structure with a branched hexasaccharide repeating unit.
Journal ArticleDOI
Structure of a fucoidan from the brown seaweed Fucus serratus L.
Maria I. Bilan,Alexey A. Grachev,Alexander S. Shashkov,Nikolay E. Nifantiev,Anatolii I. Usov +4 more
TL;DR: The fucoidan structure was investigated by 1D and 2D 1H and 13C NMR spectroscopy of its desulfated and de-O-acetylated derivatives as well as by methylation analysis of the native and Desulfated polysaccharides.