Mass Spectra of Partially Methylated Alditol Acetates. Part III. Labelling Experiments in the Mass Spectrometry of Partially Methylated Deoxyalditol Acetates.
نویسندگان
چکیده
منابع مشابه
Grouping of Partially Methylated Alditol Acetates from GC-EIMS Spectra Using Principal Component Analysis, Non-Parametric Density Estimation and K-Nearest Neighbor Classification
– Recent developments in identification of complex carbohydrates have indicated that pattern recognition techniques can effectively be applied to structural elucidation and categorization of these macromolecules. In this paper, we present one such classification methodology. Our technique utilizes data compression and feature selection using discrete Karhunen-Loeve expansion, also known as Prin...
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Methylation is one of the mest frequently used analytical methods for the structural investigation of polysaccharides. In a structural study of sulfated polysaccharides such as red algal galactans,i} this method is used not only for determining linkage position of the cornponent sugars, but also for determining the sulfate's location,2) When analyzing a red algal polysaccharide containing an ag...
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This paper describes the application of a new methodology to structural analysis of complex carbohydrates, in this case a bacterial antigenic polysaccharide, utilizing gas chromatography for the separation and tentative identification and mass spectroscopy for positive identification of partially methylated alditol acetates obtained from the original and partially degraded polysaccharide. [The ...
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A pentahexosylceramide isolated from canine kidney and intestine was shown by enzyme hydrolyses, partial acid hydrolysis, permethylation and analysis of the products by gasliquid chromatography-mass spectrometry, and serological tests to be a Forssman hapten identical in structure with the Forssman glycolipid from horse spleen. The assigned structure was N-acetylgalactosaminyl(otl +d)N-acetylga...
متن کاملMethylation-GC-MS analysis of arabinofuranose- and galactofuranose-containing structures: rapid synthesis of partially O-methylated alditol acetate standards
Arabinose and galactose were treatedwithMeOH containing traces of H2SO4 or HCl at 25◦C to givemixtures of their methyl alphaand beta-furanosides, as shown by 1D and 2D nuclear magnetic resonance (NMR). Oxidation of the Me alpha,beta-Araf mixture with NaIO4 preferentially oxidised the beta-isomer, to give pure Me alpha-Araf . Each product was progressively O-methylated using the Purdie reagent (...
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ژورنال
عنوان ژورنال: Acta Chemica Scandinavica
سال: 1971
ISSN: 0904-213X
DOI: 10.3891/acta.chem.scand.25-3299