Unperturbed dimensions and the theta temperature of dextran in ethylene glycol solutions

Çatıker, Efkan; Güner, Ali̇

doi:10.1016/s0014-3057(99)00299-2

Cited by 13 publications

(11 citation statements)

References 12 publications

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“…The intrinsic viscosity of Dex T10 C6 25 remains much closer to that of the unmodified T10 ß than that of Dex T40 C6 21 as compared to the intrinsic viscosity of T40 ß . As for the Dex T500 C6 23 , it seemed to be highly aggregated in aqueous solutions so that it was impossible to filter the corresponding solutions.…”

Section: Amphiphilic Dextran Derivativesmentioning

confidence: 77%

“…[16,17,19,21 -23] Extensive viscometric studies of dextran in various polar solvents have been performed by Güner and coworkers. [24][25][26][27] Some other thermodynamic Summary: Amphiphilic polysaccharides are obtained by hydrophobic modification of a neutral bacterial polysaccharide, dextran. By reacting the polysaccharide with aliphatic epoxides (epoxyoctane and epoxydodecane) in dimethyl sulfoxide, a series of amphiphilic polymers is obtained which covers a large range of structural parameters (length of the polysaccharide, number and nature of hydrocarbon moieties).…”

Section: Introductionmentioning

confidence: 99%

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Neutral Polymeric Surfactants Derived from Dextran: A Study of Their Aqueous Solution Behavior

Rotureau

Chassenieux

Dellacherie

et al. 2005

Macro Chemistry & Physics

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Summary: Amphiphilic polysaccharides are obtained by hydrophobic modification of a neutral bacterial polysaccharide, dextran. By reacting the polysaccharide with aliphatic epoxides (epoxyoctane and epoxydodecane) in dimethyl sulfoxide, a series of amphiphilic polymers is obtained which covers a large range of structural parameters (length of the polysaccharide, number and nature of hydrocarbon moieties). The solution behavior of dextran derivatives is first characterized by viscometric measurements in dilute and semi‐dilute domains. The effects of molecular parameters on polymer viscosity behavior are evidenced and discussed. Information on the state of aggregation of polymers is obtained by the use of static and dynamic light scattering. The presence of aggregates in the dilute domain is clearly evidenced and their structural characteristics are estimated (size, molecular weight and number of aggregation). The aggregates are shown to account for the viscometric results in the examined concentration range, relating their chemical parameters (hydrodynamic radius and molecular weight) to the macroscopic behavior of the solutions. magnified image

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Section: Amphiphilic Dextran Derivativesmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Neutral Polymeric Surfactants Derived from Dextran: A Study of Their Aqueous Solution Behavior

Rotureau

Chassenieux

Dellacherie

et al. 2005

Macro Chemistry & Physics

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“…We have applied eq. (10) to dextran/methoxy ethylene glycol and dextran/ethylene glycol system for the determination of k o , using the data available in the literature 10, 23. It can be seen that the equation fit very well giving r 2 value more than 0.95 for all the temperatures and both the solvents (Figs.…”

Section: Resultsmentioning

confidence: 88%

“…The unperturbed dimension parameter ( k o ), can be used to assess the unperturbed polymer chain dimensions as well as the chain stiffness of randomly coiled polymers and is a function of solvent and temperature 4–6. The way it depends upon these parameters is still a mystery and the conclusion drawn by different investigators vary from one to an other author 5–13. On the other hand, it is difficult and in some cases almost impossible to attain theta conditions, to obtain this parameter.…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature and thermodynamic quality of solvent over unperturbed chain dimensions of nylon 6

Baloch¹,

Nawaz²,

Bano³

2011

J of Applied Polymer Sci

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A nylon 6 sample having average molecular mass 4.825 Â 10 5 g mol À1 was fractionated into five different fractions with respect to molecular mass, which ranged from 3691 to 999,000 g mol À1 . The light scattering and intrinsic viscosity measurements were made in m-cresol and its mixture with 1,4-dioxane. The second virial coefficient, radius of gyration and Mark Houwink's constant and unperturbed chain dimensions were determined by light scattering and viscosity measurement. It has been observed that all these parameters are composition of solvent and temperature dependent. The solvent having composition of 97% m-cresol and 3% dioxane, was best and it deteriorated with the increase/decrease in percentage of 1,4-dioxane in m-cresol. However, its thermodynamic quality was enhanced with the temperature. Such variation in quality of solvent was reflected in all the estimated parameters and showed maxima at this composition of solvent. The unperturbed dimensions obtained by different methods though, differed in values but showed same trend and NA-MKB method gave close results to the one obtained through [g o ]. A new expression has also been proposed relating k o to solvent quality and temperature and the data obtained by us for nylon-6 and the one obtained from the literature for dextran obeyed this expression up to large extent irrespective of the solvent composition and temperature. The proposed equations have also been applied to dextran/methoxy ethylene and dextran/ethylene glycol systems and worked well.

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“…48,49 To confirm colloidal stability, DMNCs were redispersed in various concentrations of fetal bovine serum (0%, 25%, 50%, and 75%) and their average size was then analyzed by dynamic laser scattering. As shown in Figure 3, the sizes were very similar, confirming that the DMNCs had high stability independent of serum concentration.…”

mentioning

confidence: 99%

One-pot synthesis of magnetic nanoclusters enabling atherosclerosis-targeted magnetic resonance imaging

Kukreja

Lim²,

Kang

et al. 2014

IJN

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In this study, dextran-encrusted magnetic nanoclusters (DMNCs) were synthesized using a one-pot solution phase method for detection of atherosclerosis by magnetic resonance imaging. Pyrenyl dextran was used as a surfactant because of its electron-stabilizing effect and its amphiphilic nature, rendering the DMNCs stable and water-dispersible. The DMNCs were 65.6±4.3 nm, had a narrow size distribution, and were superparamagnetic with a high magnetization value of 60.1 emu/g. Further, they showed biocompatibility and high cellular uptake efficiency, as indicated by a strong interaction between dextran and macrophages. In vivo magnetic resonance imaging demonstrated the ability of DMNCs to act as an efficient magnetic resonance imaging contrast agent capable of targeted detection of atherosclerosis. In view of these findings, it is concluded that DMNCs can be used as magnetic resonance imaging contrast agents to detect inflammatory disease.

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Unperturbed dimensions and the theta temperature of dextran in ethylene glycol solutions

Cited by 13 publications

References 12 publications

Neutral Polymeric Surfactants Derived from Dextran: A Study of Their Aqueous Solution Behavior

Neutral Polymeric Surfactants Derived from Dextran: A Study of Their Aqueous Solution Behavior

Effect of temperature and thermodynamic quality of solvent over unperturbed chain dimensions of nylon 6

One-pot synthesis of magnetic nanoclusters enabling atherosclerosis-targeted magnetic resonance imaging

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