A study on the micelle formation of surfactants in aqueous solutions under high pressure by laser light-scattering technique. I

Nishikido, Nagamune; Shinozaki, Masamobu; Sugihara, Gohsuke; Tanaka, Mitsuru; Kaneshina, Shoji

doi:10.1016/0021-9797(80)90216-7

Cited by 52 publications

(22 citation statements)

References 14 publications

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“…Macromolecules in aqueous solutions have been known to change secondary and tertiary structure at elevated pressures (Taniguchi and Takeda, 1992). Pressure is known to reduce the degree of hydrogen bonding in water and diminish the strength of the hydrophobic interactions (Crisman and Randolph, 2009; Giovambattista et al, 2006; Nishikido et al, 1980; Tanaka et al, 1974). Interestingly, the two types of interactions that control PEG solubility are hydrogen bonding and hydrophobic interactions (Cook et al, 1992) suggesting that high pressure can perturb the solution behavior of PEG in water.…”

Section: Discussionmentioning

confidence: 99%

Crystallization of recombinant human growth hormone at elevated pressures: Pressure effects on PEG‐induced volume exclusion interactions

Crisman

Randolph

2010

Biotech & Bioengineering

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Crystallization of recombinant human growth hormone (rhGH) at elevated pressures was investigated in the presence of 6,000 molecular weight poly(ethylene glycol; PEG-6000). Crystallization of rhGH at atmospheric pressure occurred at a protein concentration of 15 mg/mL in 6% PEG-6000. Crystallization did not occur in the same solutions at 250 MPa. In contrast, at a pressure of 250 MPa in the presence of 8% PEG-6000, rhGH readily crystallized from solutions containing 35 mg/mL rhGH, whereas amorphous precipitate formed in the same solutions at atmospheric pressure. Osmotic virial coefficients were determined from static light scattering measurements and combined with a hard-sphere activity coefficient model to predict rhGH activity coefficients as a function of pressure and PEG concentration. Predicted activity coefficients quantitatively matched those determined from equilibrium solubility measurements. The ability to adjust the thermodynamic non-ideality with pressure provides a valuable tool to study protein crystallization in addition to providing a methodology for obtaining crystals at elevated pressures.

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Section: Discussionmentioning

confidence: 99%

Crystallization of recombinant human growth hormone at elevated pressures: Pressure effects on PEG‐induced volume exclusion interactions

Crisman

Randolph

2010

Biotech & Bioengineering

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“…The major eff'ect of pressure is to reduce the degree of hydrogen bonding in water [13][14][15][16]. The application of pressure to water is also known to diminish the strength of hydrophobic interactions [17,18]. As these are the two types of interactions that control PEO solubility, one can anticipate that high pressures can strongly perturb the solution behavior of PEO in water.…”

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confidence: 99%

Pressure-induced crossover from good to poor solvent behavior for polyethylene oxide in water

1992

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The application of pressure to solutions of polyethylene oxide in water causes phase separation through spinodal decomposition similar to that observed when the temperature is raised above the lower critical solution temperature. This phase separation pressure is dependent on molecular weight but independent of concentration. Viscosity measurements indicate a continuous decrease in the radius of gyration from good to theta solvent conditions as pressure is increased. This pressure-induced loss of solvent quality is a result of the loss of the ability of water to form hydrogen bonds at high pressure and the resulting changes in hydrophobic interactions.PACS numbers: 61.25.Hq, 64.75.+g, 35.20.Gs, Understanding the configuration of macromolecules in water-based solutions is fundamental to many technologies as well as to much of biology. Because of the presence of electrostatic, dipole, and hydrophobic interactions as well as hydrogen bonding the conformation of aqueous polymers can show additional complexity typically not seen in nonaqueous polymers. An example of how these forces can influence configuration is given in living organisms where the cooperative eff*ect of these interactions produces quite specific polymer chain configurations, and the resulting secondary and tertiary structures (which are known to change under pressure) [1] are responsible for a biomacromolecule's activity. The solution properties of polyethylene oxide (PEO) allow the examination of two of these forces, hydrogen bonding and hydrophobic interactions, without complications from the myriad interactions arising from multifunctional biomolecules. Nevertheless, PEO in water shows complex solution behavior manifested in its unusual phase behavior, a closed-loop temperature-concentration phase diagram at low molecular weight and a lower critical solution temperature (~100°C) for longer chain length [2]. This has attracted recent theoretical interest [3,4]. In addition, the solution behavior of PEO itself leads to many technical applications [5] including its use as a drag reducer.Under ambient conditions PEO in water is in several ways a typical example of a polymer good solvent system. The random coil nature of PEO in water has recently been unambiguously demonstrated [6]. For example, the scaling exponents /?^ocM^^^^ /?/, ocM^^"^', and Ai (xM ~^-^^ are all found to be in excellent agreement with theoretical predictions for polymers in good solvents [7]. One unusual feature of PEO in water is that the second osmotic virial coefficient A 2 is unusually large, reflecting an anomalous swelling of the chains [7,8]. This is attributed to the strong water-PEO interaction through hydrogen bonding. An ambient-temperature hydration number of 2-3 water molecules per PEO monomer unit has been reported [9][10][11]. This unusually strong hydrogen bonding plays a pivotal role in the water solubility of PEO; for example, the structurally similar polypropylene oxide has relatively weaker hydrogen bonding and thus is insoluble in water [12]. The eff'ect of el...

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“…1 At rst glance, the image seems to show a lamellar structure. With a further increase in pressure (4000 bar), large structures were observed that were interpreted as micelles of larger dimensions than those observed at 1 bar.…”

Section: Micelles Under Pressurementioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10] The results obtained using various experimental techniques (conductivity, light scattering, dynamic uorescence probing, and small-angle neutron scattering) indicate that micelles are formed in an aqueous solution of surfactants at 1 bar when the concentration of sodium dodecylsulfate (SDS) (see Fig. [1][2][3][4][5][6][7][8][9][10] The results obtained using various experimental techniques (conductivity, light scattering, dynamic uorescence probing, and small-angle neutron scattering) indicate that micelles are formed in an aqueous solution of surfactants at 1 bar when the concentration of sodium dodecylsulfate (SDS) (see Fig.…”

Section: Introductionmentioning

confidence: 99%

Micelle stability in water under a range of pressures and temperatures; do both have a common mechanism?

Espinosa

Grigera

2015

RSC Adv.

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The formation of sodium dodecylsulfate (SDS) micelles in water and heavy water at different pressures and temperatures using molecular dynamics simulations was used to analyze their stability and structure under different conditions and to evaluate the agreement with existing experiments. The results show the assembling of micelles at 1 bar and the presence of larger aggregates under high pressure (over 3 kbar). These large aggregates are not micelles but small finite pieces of bilayers in rod-like shapes. The results obtained using systems at different temperatures showed that both high and low temperatures produce lamellar structures. It is well-known that micelles expose polar residues to water and leave non-polar residues inside where they interact via hydrophobic interactions. High pressure as well as low and high temperatures inhibit the hydrophobic interactions, and under these conditions other structures are produced instead of micelles. This process seems to be similar to protein denaturation under certain temperatures and pressures.

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A study on the micelle formation of surfactants in aqueous solutions under high pressure by laser light-scattering technique. I

Cited by 52 publications

References 14 publications

Crystallization of recombinant human growth hormone at elevated pressures: Pressure effects on PEG‐induced volume exclusion interactions

Crystallization of recombinant human growth hormone at elevated pressures: Pressure effects on PEG‐induced volume exclusion interactions

Pressure-induced crossover from good to poor solvent behavior for polyethylene oxide in water

Micelle stability in water under a range of pressures and temperatures; do both have a common mechanism?

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