Yu. S. Ovodov

Determination of the molecular weight of polysaccharides by the light-scattering method

We made a comparative study of the molecular weights of certain polysaccharides isolated from natural sources, using the light-scattering method and determination of the reductive terminal groups by periodate oxidation of the compounds investigated.

Triterpenoid saponins. Communication 9. Structure of gypsoside

1. n nThe structure was established of gypsoside, the gypsogenin glycoside isolated from the roots ofGypsophila pacifica. n n n n n2. n nArguments are advanced in favor of the existence of gypsoside in two forms-in the form of the acid and of the hemiacylal resulting from interaction between the carboxy group of the glucuronic acid residue and the aldehyde group of gypsogenin.

Identity of gypsoside and a triterpene saponin from gypsophila paniculata L

The triterpene saponin ofGypsophila paniculata L. is identical with gypsoside, a nonaoside of gypsogenin isolated fromGypsophila pacifica Kom.

Migration of an acetyl group in glucosamine and glucose derivatives by the action of butyllithium. The synthesis of an N-acetylglucosamine 4-phosphate derivative

ConclusionsThe migration of the acetyl group from C4 to C6 occurs in partially acetylated derivatives of D-glucose and D-glucosamine upon reaction with butyllithium.

Determination of position of sulfate groups in sulfurizedmonosac charides

1. n nA new method was developed for the mild removal of sulfo groups from the fully acetylated sulfates of monosaccharides using thionyl chloride. n n n n n2. n nA chemical method was proposed for determining the positions of the sulfo groups in sulfurized monosaccharides, which consists in desulfurizing the acetyl derivatives and subsequent methylation. n n n n n3. n nThe acetyl groups in the acetyl derivatives of the pyridinium salts of various sulfates of D-glucose do not migrate under solvolytic desulfurization conditions.

Simple method for the quantitative study of the acetolysis of oligosaccharides

1. n nA method was proposed for measuring the acetolysis rate of oligosaccharides employing chromatography on silica gel. n n n n n2. n nA study was made of the acetolysis of maltose in various acetolysis mixtures in the presence of perchloric and sulfuric acids.

Structure and properties of eleutherocide B, the glycoside of eleutherococcus senticosus maxim

It is shown that eleutherocide B is identical with syringin, and is theβ-glucoside of sinapic alcohol.

Study of the nmr spectra of mono- and oligosaccharides in the region of a strong magnetic field

An investigation of the NMR spectra of mono- and oligosaccharides in the region of a strong magnetic field permits a judgment of the conformational and configurational changes in the structure of monosaccharides, as well as the order and conformation of the bonds between monosaceharide residues in oligosaccharides.

Electrophoresis of polysaccharides in a polyacrylamide gel

A metod for the electrophoresis of acid and neutral polysaccharides in polyacrylamide gel is described.

Identity of eleutheroside E with acanthoside D

It was shown that eleutheroside E, one of the glycosides isolated from the prickly eleutherococcus, is identical with acanthoside D, which is one of the glycosides isolated from the cluster-flowering acanthopanax and represents the. di-β-D-glucoside of (−)-syringaresinol.