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Akasaka, Hidemichi; Yanagi, Mitsuo; Katsura, Hakuji

doi:10.5107/sccj.14.123

Cited by 7 publications

(6 citation statements)

References 1 publication

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“…(Yokohama, Japan). It was isolated from strain of bacteria, Streptococcus zooepidemicus and was highly purified according to the method by Akasaka et al [38] The cationic surfactant decyltrimethylammonium bromide (C 10 TAB) and NaCl were purchased from Fluka and Sigma and purified prior to any measurements. The different concentrations were prepared by weight from individual stock solutions of polyelectrolyte, surfactant and salt in water.…”

Section: Samples Preparationmentioning

confidence: 99%

Static and Dynamic Light Scattering of Polyelectrolyte/Surfactant Solutions: the Na‐Hyaluronate/(C₁₀TAB) System

Villetti

Borsali

Crespo

et al. 2004

Macro Chemistry & Physics

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Summary: This work discusses the interactions between the anionic polyelectrolyte sodium hyaluronate (Na‐Hy) and the cationic surfactant decyltrimethylammonium bromide (C10TAB). Static and dynamic light scattering experiments were carried out in the single homogenous phases (region I: [C10TAB] < 0.040 M and region III: [C10TAB] > 0.350 M) in “salt‐free” and at different added salt concentrations (NaCl) in order to gain more understanding on the chain conformation and on the dynamics of polyelectrolyte/surfactant systems. In region I, the Na‐Hy “salt‐free” system exhibits the expected polyelectrolyte properties, i.e. the scattering intensity increases with the addition of surfactant or salt. As a consequence of this screening of the electrostatic interactions, a decrease in both the radius of gyration Rg and the second virial coefficient A2 is observed. This decrease is found more pronounced in the presence of surfactant C10TAB than in the case of added salt (Na‐Hy/NaCl). Consequently, the calculated apparent persistence length Lt, assuming a worm‐like chain at high ionic strength, is found about 58 Å in the case of surfactant and Lt = 71 Å in the case of added salt. This result demonstrates clearly that the binding of the surfactant to Na‐Hy is stronger than in the case of added salt and is at the origin of the phase separation that occurs at the concentration of C10TAB > 0.040 M. As far as the dynamic properties are concerned, the autocorrelation functions in “salt‐free” solutions measured in region I are better described by two relaxation modes (intermediate and slow) and by three relaxation modes (fast, intermediate and slow) in region III. The three relaxation modes reflect respectively the dynamics of free micelles (fast mode), association‐dissociation equilibrium of micelle‐like clusters (intermediate mode) and polymer‐micelles adsorption (slow mode). At high ionic strength (added salt) in region III, the micelle diameter increases (fast mode), the intermediate mode disappears and the polymer‐micelles adsorption diffusion coefficient increases due to the screening of the electrostatic interactions.Phase diagram of Na‐Hy polyelectrolyte in C10TAB surfactant and NaCl salt.imagePhase diagram of Na‐Hy polyelectrolyte in C10TAB surfactant and NaCl salt.

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Section: Samples Preparationmentioning

confidence: 99%

Static and Dynamic Light Scattering of Polyelectrolyte/Surfactant Solutions: the Na‐Hyaluronate/(C₁₀TAB) System

Villetti

Borsali

Crespo

et al. 2004

Macro Chemistry & Physics

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“…for the wormlike chain. Thus, (S2) of the hyaluronate chain with a given M should be determined by q, Ml, 3 r [0.933 + 0.067 exp(-0.85z -1.39z2)] (17) which reduces to the original Domb-Barrett equation in the coil limit. We note again that eq 17 quite accurately describes as2 data for nonionic, flexible polymers.32,33,36,37…”

Section: Consideration Of Excluded-volmne Effectsmentioning

confidence: 99%

Chain-stiffness and excluded-volume effects in solutions of sodium hyaluronate at high ionic strength

Hayashi¹,

Tsutsumi²,

Nakajima³

et al. 1995

Macromolecules

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“…Other isolation and purification methods have been described by Della Valle and Romeo 8. The bacterial production of HA by Streptococcus equi 9 and Streptococcus zooepidemicus 10 enabled it to be produced in larger quantities than could be achieved with the extraction methods.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the swelling behavior of crosslinked hyaluronic acid films and hydrogels produced using homogeneous reactions

Collins

Birkinshaw

2008

J of Applied Polymer Sci

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Hyaluronic acid (HA) has been crosslinked in solution with glutaraldehyde (GTA), 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC), poly(ethylene glycol) diglycidylether (EX 810), and divinyl sulfone (DVS) to form hydrogels. Flory-Rehner calculations were used to determine molecular weight between crosslinks (M c ), the crosslink density (V e ), and mesh size (e) of crosslinked hydrogels after 24-h swelling in distilled water. Generally, lower molecular weight films gave rise to decreased molecular weights between crosslinks as well as increased effective crosslink densities and decreased mesh size. The effects of pH and salt concentration were evaluated. Use of lower molecular weight HA gave rise to decreased molecular weights between crosslinks as well as increased effective crosslink densities and decreased mesh size. Water diffusion coefficients were measured for DVS and GTA hydrogels and were found to be 1.4 3 10 210 and 1.8 3 10 210 m 2 s 21 . Autocrosslinked and HA polyethyleneimine gels were also produced but had very limited stabilities compared with the covalently crosslinked materials.

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Cited by 7 publications

References 1 publication

Static and Dynamic Light Scattering of Polyelectrolyte/Surfactant Solutions: the Na‐Hyaluronate/(C₁₀TAB) System

Static and Dynamic Light Scattering of Polyelectrolyte/Surfactant Solutions: the Na‐Hyaluronate/(C₁₀TAB) System

Chain-stiffness and excluded-volume effects in solutions of sodium hyaluronate at high ionic strength

Investigation of the swelling behavior of crosslinked hyaluronic acid films and hydrogels produced using homogeneous reactions

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Untitled

Cited by 7 publications

References 1 publication

Static and Dynamic Light Scattering of Polyelectrolyte/Surfactant Solutions: the Na‐Hyaluronate/(C10TAB) System

Static and Dynamic Light Scattering of Polyelectrolyte/Surfactant Solutions: the Na‐Hyaluronate/(C10TAB) System

Chain-stiffness and excluded-volume effects in solutions of sodium hyaluronate at high ionic strength

Investigation of the swelling behavior of crosslinked hyaluronic acid films and hydrogels produced using homogeneous reactions

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Static and Dynamic Light Scattering of Polyelectrolyte/Surfactant Solutions: the Na‐Hyaluronate/(C₁₀TAB) System

Static and Dynamic Light Scattering of Polyelectrolyte/Surfactant Solutions: the Na‐Hyaluronate/(C₁₀TAB) System