A novel methylation derivatization method for δ<sup>18</sup>
O analysis of individual carbohydrates by gas chromatography/pyrolysis-isotope ratio mass spectrometry
作者:Marco M. Lehmann、Maria Fischer、Jan Blees、Michael Zech、Rolf T. W. Siegwolf、Matthias Saurer
DOI:10.1002/rcm.7431
日期:2016.1.15
The oxygen isotope ratio (δ18O) of carbohydrates derived from animals, plants, sediments, and soils provides important information about biochemical and physiological processes, past environmental conditions, and geographical origins, which are otherwise not available. Nowadays, δ18O analyses are often performed on carbohydrate bulk material, while compound‐specific δ18O analyses remain challenging
Reductive cleavage of glycosides with borane complexes in the presence of boron trifluoride etherate
作者:In Hwan Oh、Gary R. Gray
DOI:10.1016/0008-6215(95)00254-5
日期:1995.12
Mixtures consisting of five equivalents each of borane.methyl sulfide and borontrifluoride etherate per equivalent of acetal or five equivalents of various amine-borane complexes and 10 equivalents of borontrifluoride etherate readily accomplished reductive cleavage of the glycosidic linkages of several per-O-methylated monosaccharides and polysaccharides. In all cases, the expected products were
Highly selective cleavage of furanosyl linkages in liquid hydrogen fluoride
作者:Xiaoyang Qi、Anthony Behrens、Andrew J. Mort
DOI:10.1016/0008-6215(93)84075-h
日期:1993.10
maintained, only furanosyl linkages are cleaved. We have tested the lability of three different furanosides in several different compounds by comparing the ‘H and/or 13C NMR spectra of the compounds before and after such an HF treatment. Fructofiranosidtx-Sucrose and related oligomers are readily available examples containing fructofuranosyl linkages. These oligomers contain the cr-p-glucopyranosyl-(1