Acetylation and CrO(3) oxidation in acetic acid (Angyal and James, Aust. J. Chem. 23: 1209-1221, 1970) was applied to 18 different glyceroglycolipids and glycosphingolipids of known structure. The lipids studied contained from one to five pyranosic monosaccharide units including alpha- and beta-linked glucose, galactose, mannose, and N-acetylgalactosamine and beta-linked N-acetylglucosamine. Mo...

Complex mixtures of carbohydrates pose distinct challenges in routine and high-throughput analysis, so that only a few carbohydrate components are routinely resolved and identified in biofluids, extracts, foods and other complex mixtures. Here, we conduct precise measurements of (1)H and (13)C anomeric chemical shifts to construct a reference library of specific carbohydrate signals with high-r...

In this study, we have designed, synthesized and full characterized a novel biological based acidic nano organocatalyst via condensations reaction of uric acid phosphorous acid. The obtained compound was named theacrine tetrakis(phosphonic acid) (TTPA) prepared under refluxing ethanol. This new applied as an efficient recyclable catalyst for the preparation pyridines with indole moieties cooper...