Results 151 to 160 of about 1,342 (208)

Synthesis of gallotannins

Carbohydrate Research, 2001
As a contribution to the synthesis of gallotannins, four O-galloyl-D-glucoses (3-O-, 6-O-, 3,6-di-O-, 3,4,6-tri-O-galloyl-D-glucose) have been prepared by the reaction of tri-O-benzylgalloyl chloride and partially protected glucose derivatives (1,2-O-, and 1,2:5,6-di-O-isopropylidene-alpha-D-glucofuranose), followed successively by catalytic ...
Q, He, B, Shi, K, Yao, Y, Luo, Z, Ma
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Determination of Gallotannin in Beer [PDF]

Journal of the American Society of Brewing Chemists, 1976
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Determination of gallotannin with rhodanine

Analytical Biochemistry, 1988
A reliable method for quantitative analysis of gallotannin in plants has been devised. Gallotannin is hydrolyzed with acid, and gallic acid in the hydrolysate is then assayed using rhodanine. This method is very specific; no interferences from other plant phenolics, including ellagic acid and condensed tannin, have been observed.
K H, Inoue, A E, Hagerman
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Enzymology of Gallotannin and Ellagitannin Biosynthesis

ChemInform, 2005
AbstractFor Abstract see ChemInform Abstract in Full Text.
Ruth, Niemetz, Georg G, Gross
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Biodegradation of gallotannins and ellagitannins

Journal of Basic Microbiology, 2006
AbstractNowadays, many researches have been made on gallotannin biodegradation and have gained great success in further utilization. Some of industrial applications of these findings are in the production of tannase, the biotransformation of tannic acid to gallic acid or pyrogallol and detannification of food and fodder. Although ellagitannins have the
Mingshu, Li, Yao, Kai, He, Qiang, Jia, Dongying   +3 more
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Mass spectrometry for the direct analysis of gallotannins [PDF]

, 1985
Structural analysis of gallotannins is currently carried out in the following steps: - extraction from the natural Matrix; -chromatographic isolation/putrification; - chemical or enzymatic hydrolysis of the tannins; - instrumental/chemical analysis of the hydrolytic products.
R. Maffei Facino, M. Carini, G. Minardi, P. Traldi   +3 more
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The structure of gallotannins

Chemistry of Natural Compounds, 1973
1. It has been established that the semiacetal hydroxyls of the carbohydrate components of the tannins of the smoketree and of Turkish galls are substituted by galloyl residues and the C3 hydroxy group is free; on the other hand, in the tannins from sumac and Chinese galls all the hydroxy groups of the sugars are substituted by galloyl residues with ...
I. Sh. Buziashvili, N. F. Komissarenko, I. P. Kovalev, V. G. Gordienko, D. G. Kolesnikov   +4 more
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Gallotannins. Part XIV. Structure of the gallotannins

Journal of the Chemical Society C: Organic, 1967
Structures are suggested for the principal naturally occurring polyesters of gallic acid, based upon 1H n.m.r. spectroscopy. The mass-spectroscopic behaviour of methylated Chinese gallotannin is described.
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Gallotannins. Part XIII. The structure of Chinese gallotannin: evidence for a polygalloyl chain

Journal of the Chemical Society C: Organic, 1966
Evidence is presented relating to the disposition of the depsidically linked galloyl groups on the penta-O-galloyl-β-D-glucose core of Chinese gallotannin. Interpretation of the n.m.r. spectra of methylated gallotannin fractions using the spectra of model depsides and several tri-O-methylgalloyl sugar derivatives permits the tentative formulation of ...
G. Britton, P. W. Crabtree, E. Haslam, J. E. Stangroom   +3 more
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Enzymology of Gallotannin Biosynthesis [PDF]

, 1989
Georg G. Gross
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