The polysaccharide capsule that surrounds S. pneumoniae protects the bacteria from destruction by white blood cells and therefore is important in its ability to produce disease. There are about 90 serotypes of S. pneumoniae, classified on the basis of their antigenic differences in the capsular polysaccharide. The currently licensed polysaccharide vaccine contains 23 serotypes, but children und...

The structure of Butyrivibrio fibrisolvens strain 49 capsular polysaccharide has been investigated mainly by sugar and methylation analysis, partial chemical degradations, NMR spectroscopy, and mass spectrometry. The results suggest that the polysaccharide is composed of pentasaccharide repeating units having the following structure. [formula: see text] The polysaccharide contains O-acetyl grou...

The extracellular polysaccharide produced by Butyrivibrio fibrisolvens strain H10b, when grown under strictly anaerobic conditions with glucose as carbohydrate source, has been studied by chemical and spectroscopic techniques. The results demonstrate that the polysaccharide consists of hexasaccharide repeating units with the following structure: [structure: see text] The isolated polysaccharide...

The assembly of colloidal hyaluronic acid (HyA, as a polysaccharide) based hydrogel particles in an aqueous medium is characterized the present paper, with emphasis on particular case nanohydrogels formed by surfactant-neutralized polysaccharide networks. structural changes and particle formation process polysaccharide- cationic-surfactant-containing systems were induced charge neutralization a...

Functionalization of polysaccharide-based packaging incorporating inorganic nanoparticles for food preservation is an active research area. This review summarizes the use materials functionalized with (TiO2, ZnO, Ag, SiO2, Al2O3, Fe2O3, Zr, MgO, halloysite, and montmorillonite) to develop hybrid fruit, vegetables, meat (lamb, minced, pork, poultry), mushrooms, cheese, eggs, Ginkgo biloba seeds ...

The structure of the O-antigen polysaccharide from Escherichia coli O138 has been determined. NMR spectroscopy, together with component and methylation analyses, of native and reduced polysaccharide were the principal methods used. The sequence of the sugar residues could be determined by NOESY and heteronuclear multiple bond connectivity (HMBC) NMR experiments. It is concluded that the polysac...

on slime polysaccharide A, whereas depolymerases associated with phages 6, 7, 9, and 10, like pseudomonas phage 2, hydrolyzed slime polysaccharide B. None of the depolymerases was active on slime polysaccharide C. Despite exhaustive purification, depolymerase activity was found to band with the phage particles at a density of 1.49 to 1.51 g/mI in a density gradient composed to cesium chloride. ...

We resolved previous conflicting results concerning the presence of 3-hydroxybutyryl substituents on the extracellular acidic polysaccharide from Rhizobium trifolii 0403. These substituents were indeed present in the polysaccharide and in the oligosaccharide fragments obtained by hydrogen fluoride solvolysis of the extracellular and capsular polysaccharides of the bacteria grown on plates. The ...

BACKGROUND Group A Neisseria meningitidis has been a major cause of bacterial meningitis in the sub-Saharan region of Africa in the meningitis belt. Neisseria meningitidis is an encapsulated pathogen, and antibodies against the capsular polysaccharide are protective. Polysaccharide-protein conjugate vaccines have proven to be highly effective against several different encapsulated bacterial pat...