Crystalline, liquid crystalline, and isotropic phases of sodium deoxycholate in water

Su, Ziyang; Luthra, Suman; Krzyzaniak, Joseph F.; Agra-Kooijman, Deña Mae; Kumar, Satyendra; Byrn, Stephen R.; Shalaev, Evgenyi

doi:10.1002/jps.22690

Cited by 8 publications

(7 citation statements)

References 18 publications

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“…This DOC concentration is sufficiently low to avoid the formation of complex elongated micellar phases [26,27], and sufficiently high to form a more isotropic glassy state upon freezing [28] and to avoid SWCNT bundling during the pressure cycle. While for pure water, hydrostaticity is lost at the solidification pressure of 1 GPa, the presence of the DOC surfactant extends the quasi-hydrostatic conditions to higher pressure.…”

Section: Characterization Techniquesmentioning

confidence: 99%

Chirality-dependent mechanical response of empty and water-filled single-wall carbon nanotubes at high pressure

Torres-Dias

Cambré

Wenseleers

et al. 2015

Carbon

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Section: Characterization Techniquesmentioning

confidence: 99%

Chirality-dependent mechanical response of empty and water-filled single-wall carbon nanotubes at high pressure

Torres-Dias

Cambré

Wenseleers

et al. 2015

Carbon

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“…[10,11] The specific molecular structure not only results in the features of amphiphile, but leads to the limitation of self-assembly ability. [12][13][14] As a commercially available oleyled polyethylene oxide (POE) surfactant, Brij 97 is widely applied in the range of pharmaceutical, cosmetic, and food formulations.…”

Section: Introductionmentioning

confidence: 99%

Curcumin-Encapsulated Hexagonal Liquid Crystalline Formed by Brij 97/NaDC Mixtures

Liu

Wang

Wei

et al. 2014

Journal of Dispersion Science and Technology

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The phase diagram of a five-components Brij 97-NaDC/IPM-PEG 400/H 2 O system was determined at 25 C. The hexagonal liquid crystalline phase (H 1 ) was found in this system. By use of small-angle x-ray scattering (SAXS), polarization microscopy, and rheology techniques, the influence of composition, temperature, and addition of curcumin on H 1 phase was studied. It is shown that: 1) the investigated hexagonal liquid crystals exhibit a strong shear thinning behavior and viscoelasticity and the strength of the network of H 1 phase becomes weaker with increasing oil content; 2) the frequency-dependent moduli of H 1 samples decreases as the 1699 temperature increases and the steady-state limiting viscosity of the hexagonal samples shows an Arrhenius-like dependence on temperature; and 3) samples in H 1 phase containing curcumin retained their organized hexagonal structure. The SAXS results show that the curcumin molecules may be solubilized both into the apolar core of cylinders together with IPM and in the polar domain coexisting with PEG 400 between the cylinders. When curcumin is encapsulated in samples with low oil content, there is a significant decrease in the frequency-dependent moduli. The tendency of frequency behavior for samples incorporating curcumin as a function of temperature is weakened.

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“…The surfactant we use, sodium deoxycholate (DOC), is a bile salt, which possesses exclusive biological properties. It is known to form aggregates in water, both small (bile salt micelles) and large (tubes), [12][13][14][15] different from typical micelles formed by other surfactants. Large tubular aggregates make highly ordered phases: crystals, liquid crystals and whiskers.…”

mentioning

confidence: 99%

“…Large tubular aggregates make highly ordered phases: crystals, liquid crystals and whiskers. 15 Their phase transformations are known to be very slow and the phase equilibrium can be shifted by adding monovalent salt (NaCl and NaBr) solutions. 16 Bile salts readily form mixed micelles with both organic and inorganic substances, insoluble by themselves.…”

mentioning

confidence: 99%

“…We speculate that the transient state may correspond to the Tb partially coordinated between DOC molecules, making an initial DOC-gel structure, solvated by larger number of water molecules. With time, bigger DOC (tubular) aggregates or other DOC high order phases 15,35 start to grow. REIs slowly penetrate in aggregates, expelling excess water outside, and forming the steady-state long-lived ''waterproof'' complexes inside.…”

mentioning

confidence: 99%

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Formation and dynamics of “waterproof” photoluminescent complexes of rare earth ions in crowded environment

Ignatova

Blades

Duque

et al. 2014

Phys. Chem. Chem. Phys.

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Understanding behavior of rare-earth ions (REI) in crowded environments is crucial for several nano- and bio-technological applications. Evolution of REI photoluminescence (PL) in small compartments inside a silica hydrogel, mimic to a soft matter bio-environment, has been studied and explained within a solvation model. The model uncovered the origin of high PL efficiency to be the formation of REI complexes, surrounded by bile salt (DOC) molecules. Comparative study of these REI-DOC complexes in bulk water solution and those enclosed inside the hydrogel revealed a strong correlation between an up to 5×-longer lifetime of REIs and appearance of the DOC ordered phase, further confirmed by dynamics of REI solvation shells, REI diffusion experiments and morphological characterization of microstructure of the hydrogel.

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Crystalline, liquid crystalline, and isotropic phases of sodium deoxycholate in water

Cited by 8 publications

References 18 publications

Chirality-dependent mechanical response of empty and water-filled single-wall carbon nanotubes at high pressure

Chirality-dependent mechanical response of empty and water-filled single-wall carbon nanotubes at high pressure

Curcumin-Encapsulated Hexagonal Liquid Crystalline Formed by Brij 97/NaDC Mixtures

Formation and dynamics of “waterproof” photoluminescent complexes of rare earth ions in crowded environment

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