This review covers the production, properties and applications of the biopolysaccharide dextran; this biopolymer can be produced via fermentation either with Leuconostoc mesenteroides strains and other lactic acid bacteria or with certain Gluconobacter oxydans strains. The former strains convert sucrose into dextran with the dextransucrase enzyme whereas the latter convert maltodextrins into de...

On the basis of high enzyme activity a newly isolated strain of L. mesenteroides CMG713 was selected for dextran production. For maximum yield of dextran, effects of various parameters such as pH, temperature, sucrose concentration and incubation period were studied. L. mesenteroides CMG713 produced maximum dextran after 20 hours of incubation at 30 masculineC with 15% sucrose at pH 7.0. The mo...

A brick-and-mortar-like ultrasoft nanocomposite metallogel is formed by crosslinking cellulose nanocrystals (CNC) with ammonium zirconium carbonate (AZC) to trap and reconfigure dextran, a model biomacromolecule. The bricks (CNC) reinforce the metallogel, compete with dextran in reacting with AZC, and decouple long-time dextran dynamics from network formation, while the mortar (AZC) imparts bim...

shown by demonstrating that the overall rate of dextransucrase synthesis is independent of the concentration of 1,6-linked dextran acceptor if synthesis is continued for periods that are directly proportional to the amount of acceptor present. For example, in the presence of 1 mg of acceptor dextran, the rate of dextransucrase action measured over lOmin is identical with the rate measured over ...

Effect of polyanions on saturation density and production of viscous substance of cells of mouse and hamster cell lines was studied. Cell lines used were 3T6, HA-2 and HA-8 cells. Polyanions were dextran sulfate, (3,6-anhydro-4-o-beta-galactopyranosyl-2-D-galactopyranose-2,4'-bis (potassium/sodium sulfate) (1 leads to 3) polysaccharide (polygeenan) and dextran phosphate. Dextran sulfate reduced...

Maximum yield of dextran was obtained when using ground date seeds. Different concentrations of date seeds were applied and the highest dextran production was achieved at 6 g/flask. Extraction of dextran was carried out using ethanol. The molecular weight of the purified dextran was 67 kDa by GPC. Spectral analysis showed that dextran contains D-glucose units in a linear chain with consecutive ...

BACKGROUND Reliable information on the incidence of severe reactions to iron dextran is limited. Administration of agents of resuscitation in acute anaphylaxis may serve as a marker to quantify life-threatening adverse drug reactions. METHODS To determine the incidence of the most serious reactions to intravenous (i.v.) iron dextran, we searched the Gambro Healthcare US medical database for e...

BACKGROUND Several different methods have been used to assess pulmonary permeability in response to acute lung injury (ALI). However, these methods often involve complicated procedures and algorithms that are difficult to precisely control. The purpose of the current study is to establish a feasible method to evaluate alterations in lung permeability by instilling fluorescently labeled dextran ...

The objective of this study is to prepare a non-viral carrier of gene expression from the polysaccharide dextran and evaluate the effect of amine compounds introduced to dextran on the level of gene expression. Dextran with a molecular weight of 74 x 10(3) was cationized by the chemical introduction of different amine compounds. The cationized dextran was complexed with a plasmid DNA and the vi...