Results 171 to 180 of about 5,055,133 (206)

THE ANALYSIS OF HEXURONIC ACIDS IN BIOLOGICAL MATERIALS BY GAS-LIQUID PARTITION CHROMATOGRAPHY.

Canadian Journal of Biochemistry, 1965
A new method for the determination and characterization of hexuronic acids is presented. Hexuronic acid salts are quantitatively reduced by aqueous sodium borohydride to the corresponding aldonic acids which are subsequently converted to their 1,4-lactones.
M. Perry, R. K. Hulyalkar
semanticscholar   +5 more sources

Electrophoresis of hexuronic acids.

Journal of Chromatography A, 1970
M. S. Cyr
semanticscholar   +4 more sources

A gas chromatographic method for the quantitative determination of hexuronic acids in alginic acid.

Analytical Biochemistry, 1981
Abstract A method has been developed for the quantitative determination of the relative proportions of d -mannuronic and l -guluronic acids in alginic acid. To obtain homogeneous reaction conditions the viscosity of the alginic acid sample was first decreased by limited hydrolysis with mineral acid.
L. Vadas, H. Prihar, B. K. Pugashetti, D. Feingold   +3 more
semanticscholar   +4 more sources

Separation of hexuronic acids by an ion-exchange process.

Biochimica et Biophysica Acta, 1962
D. Dziewiatkowski
semanticscholar   +4 more sources

A copper reagent for the determination of hexuronic acids and certain ketohexoses

Carbohydrate Research, 1967
Y. Milner, G. Avigad
semanticscholar   +3 more sources

Color Reaction of Hexuronic Acids with Anthrone

Analytical Chemistry, 1956
J. Helbert, K. D. Brown
semanticscholar   +3 more sources

A simple method for the detection and quantitative determination of hexuronic acids and pentoses.

Analytical Biochemistry, 1974
Abstract The present report describes a new and simple method for the detection and quantitative determination of pentoses and hexuronic acids either separately or in a mixture. The method involves treatment of the sample with sulfuric acid followed by the addition of harmine and then cysteine. Hexuronic acids produce a pink color with harmine, while
A. Wardi, W. S. Allen, R. Varma
semanticscholar   +4 more sources

G.L.C. of the O-trimethylsilyl derivatives of hexuronic acids.

Carbohydrate Research, 1976
The free acids, sodium salts, and lactones of several hexuronic acids have been studied as their O-trimethylsilyl derivatives by gas-liquid chromatography using SE-30 and XE-60 liquid phases. Silylation was best performed in methyl sulphoxide. The equilibrium between the various forms of a hexuronic acid in methyl sulphoxide was also studied by g.l.c ...
J. Kennedy, S. Robertson, M. Stacey
semanticscholar   +4 more sources

Two modifications of the carbazole reaction of hexuronic acids for the differentiation of polyuronides.

Analytical Biochemistry, 1967
Abstract Two modifications of the carbazole reaction of hexuronic acids are described which differ from the original reaction by the concentration of acid, the temperature, and the duration of heating. The different hexosaminohexuronides show very different extinction coefficients in these two reactions which can be used for the differentiation of ...
Z. Dische, C. Rothschild
semanticscholar   +4 more sources

Colorimetric assays for hexuronic acids and some keto sugars.

Methods in Enzymology, 1975
Publisher Summary This chapter discusses the colorimetric assays for hexuronic acids and some keto sugars. In the reaction of the reducing sugars with an acid-copper reagent, hexuronic acids and some keto sugars rapidly reduce dilute Cu + solutions (15.6 m M ) at acid pH in the presence of high salt concentrations to suppress Cu + reoxidation.
G. Avigad
semanticscholar   +3 more sources