Structural Change in Dextran: Mechanism of Insolubilization by Adsorption on the Air–Liquid Interface

Hirata, Yasushi; Sano, Yoh; Aoki, Mitsuo; Kobatake, Hideki; Kato, Shigeaki; Yamamoto, Hiroyuki

doi:10.1006/jcis.1998.6056

Cited by 6 publications

(7 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Clinical dextran (molecular weight 40,000) and boron-free dextran (molecular weight 40,000) were purchased from Meito Sangyo Co., Ltd. Clinical dextran was treated with methanol to obtain boron-free dextran (3).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Small-Angle X-Ray Scattering Studies on Nucleation Formation of Dextran Precipitation in the Presence of Boron

Hirata

Sano

Aoki

et al. 2000

Journal of Colloid and Interface Science

Self Cite

View full text Add to dashboard Cite

Section: Methodsmentioning

confidence: 99%

“…The trigger for precipitation influences the adsorption rate of dextran at the air-liquid interface (3). The presence of an impurity (trace element) can trigger precipitation.…”

Section: Introductionmentioning

confidence: 99%

Small-Angle X-Ray Scattering Studies on Nucleation Formation of Dextran Precipitation in the Presence of Boron

Hirata

Sano

Aoki

et al. 2000

Journal of Colloid and Interface Science

Self Cite

View full text Add to dashboard Cite

“…Being more rod-like below M w 2000 g mol -1 , dextran molecules behave as a random coil in aqueous, low concentration solution, as examined by small angle X-ray scattering (SAXS) measurements [40][41][42]. If a certain overlap concentration is reached, the individual chains interpenetrate each other and form a transient network of entangled chains resulting in more compact coil geometry and thus a non-Newtonian behaviour [43,44].…”

Section: Physico-chemical Characteristicsmentioning

confidence: 99%

“…The molecular weight of the dextran fraction can influence the time of the dissolution. A 10% aqueous dextran solution (M w 40 000 g mol -1 ) will develop precipitates during storage, indicating that dextran solutions are not stable [42,50]. The adsorption of dextran molecules on the air-liquid interface is the first step of insolubilisation.…”

Section: Propertiesmentioning

confidence: 99%

Functional Polymers Based on Dextran

Heinze

Liebert

Heublein

et al.

Advances in Polymer Science

253

198

View full text Add to dashboard Cite

Dextran, comprising a family of neutral polysaccharides consisting of an α-(1→6) linked d-glucose main chain with varying proportions of linkages and branches, depending on the bacteria used, is an interesting starting material for chemical modification reactions for the design of new functional polymers with promising properties. The review summarises recent results on structure characterisation of dextran including some comments on biosynthesis of this important class of biopolymers. Applications of dextran are discussed as well. Chemical modification reactions of dextran are increasingly studied for the structure and hence property design. The review highlights recent progress in esterification of dextran, both inorganic and organic polysaccharide esters, etherification reactions towards ionic and non-ionic ethers, and the huge variety of different conversions mainly developed for the binding of drugs. It summarises recent developments in the application of dextran derivatives with a focus on the chemical structures behind these materials such as prodrugs, bioactivity of inorganic dextran esters, heparin sulfate mimics, hydrogels, nanoparticles and self assembly structures for surface modification. Keywords Functionalised dextran • Structural analysis • Prodrugs • Nanostructures • Bioactivity Abbreviations AFM Atomic force microscopy AGU Anhydroglucose units AT Antithrombin AZT Azidothymidine BSH Na 2 B 12 H 11 SH BSA Bovine serum albumin CAC Critical association concentration CDI N,N -Carbonyldiimidazole CMC Critical micelle concentration CMD Carboxymethyl dextran CMDB Carboxymethyl dextran benzylamide CMDBSSu Carboxymethyl dextran benzylamidesulfonate sulfate CMDBSu Carboxymethyl dextran benzylamide sulfate CMDEE Carboxymethyl dextran ethyl ester CMDSu Carboxymethyl dextran sulfate COSY Two-dimensional correlated spectroscopy CsA Cyclosporin A 2D Two-dimensional Dach-Pt cis-Dihydroxo(cyclohexane-trans-l-1,2-diamine)platinum II DCC N,N -Dicyclohexylcarbodiimide T. Heinze et al.

show abstract

“…9 Estes precipitados podem ainda ser conseqüência de alterações estruturais nas dextranas por associação a íons metálicos. 10,11 É bem estabelecida a precipitação de dextranas em função de sua massa molar e do percentual de etanol presente em diferentes matrizes. 4,12 A relação massa molar versus concentração de etanol é o fundamento de várias metodologias para a análise quantitativa de dextranas, tais como os métodos de Robert's 4,9 e Haze.…”

Section: 2unclassified

Dextranas em açúcares do estado de São Paulo

Aquino¹,

Franco²

2008

Quím. Nova

View full text Add to dashboard Cite

Recebido em 15/3/07; aceito em 27/11/07; publicado na web em 8/7/08 DEXTRANS IN SUGARS FROM SÃO PAULO STATE. The characterization of dextran in sugars by size exclusion chromatography (SEC) has been carried out according to the number-average molecular weight (Mn), the weight-average molecular weight (Mw), the Z-average molecular weight (Mz), and the polydispersity (Mw/Mn). The results suggest that all the analyzed thirty sugar samples from São Paulo state were contaminated with two or three different dextran polymers. The collected data clearly point out that the total dextran content together with the mass distribution parameters Mw, Mn, Mz, and Mw/Mn should be considered during the evaluation of the quality of the sugar used for the cachaça sweeting process.

show abstract

Structural Change in Dextran: Mechanism of Insolubilization by Adsorption on the Air–Liquid Interface

Cited by 6 publications

References 7 publications

Small-Angle X-Ray Scattering Studies on Nucleation Formation of Dextran Precipitation in the Presence of Boron

Small-Angle X-Ray Scattering Studies on Nucleation Formation of Dextran Precipitation in the Presence of Boron

Functional Polymers Based on Dextran

Dextranas em açúcares do estado de São Paulo

Contact Info

Product

Resources

About