The formation of molecular aggregation structures in ternary system: Aerosol OT/water/iso-octane

Tamamushi, Bun-ichi; Watanabe, Norihiro

doi:10.1007/bf01498277

Cited by 108 publications

(52 citation statements)

References 5 publications

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“…The conductivity of reversed micelles is almost unaffected by PVP-K30 when x 0 is below 10; while the conductivity in the presence of PVP-K30 is larger than that in its absence when x 0 >10. This indicates a strong interaction between the polymer and the reversed micelles as described in the literature [19]. The attracting interaction between the reversed micelles increases with added water-soluble polymer.…”

Section: Conductivities Of the Reversed Micelles In The Presence Of Dsupporting

confidence: 75%

“…The dashed line refers to the 0.1 mol L -1 AOT solution studied in this paper with the water content increasing from a to c. The regions of the reversed micelle and the liquid crystal in the presence of PVP-K30 are both smaller than those in its absence, while the bicontinuous region is larger in the presence of PVP than in its absence. Only the reversed micelle region without PVP is similar to that of the water/AOT/isooctane system [19]. Also, it can be seen from the figure that the region of O/W microemulsion is further from the water acme in the presence of PVP.…”

Section: Resultsmentioning

confidence: 73%

“…People hope to mimic biomembranes and to disclose the biological physics and biological chemistry phenomena by investigating the water state in the reversed micelle and microemulsion. Much work has been done on the study of interactions between the water-soluble polymers and the reversed micelles, for example, the effects of the polymer on the size, structure and physical chemical properties of the reversed micelles [18,19,20,21,22]. However, general features of the interaction between PVP and AOT reversed micelles are still unclear.…”

mentioning

confidence: 99%

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The interaction between poly(vinylpyrrolidone) and reversed micelles of water/AOT/ n -heptane

Luan

Dai

et al. 2003

Colloid & Polymer Science

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Section: Conductivities Of the Reversed Micelles In The Presence Of Dsupporting

confidence: 75%

Section: Resultsmentioning

confidence: 73%

mentioning

confidence: 99%

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The interaction between poly(vinylpyrrolidone) and reversed micelles of water/AOT/ n -heptane

Luan

Dai

et al. 2003

Colloid & Polymer Science

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“…Second, the systems water/organic solvent/surfactant quite easily reach equilibrium and, hence, the phase transitions are reversible [18, [50][51][52][53][54][55]62, 631 (in the absence of protein). For alkaline phosphatase we made sure that its catalytic activity is independent of the way of achieving the final structure of the medium: (a) lamellas via reversed micelles or directly ; (b) the reversed hexagonal phase via reversed micelles or directly; and finally, (c) the reversed micelles via lamellas or directly.…”

Section: Resultsmentioning

confidence: 99%

Catalysis by enzymes entrapped into hydrated surfactant aggregates having lamellar or cylindrical (hexagonal) or ball‐shaped (cubic) structure in organic solvents

Klyachko

Levashov

Pshezhetsky

et al. 1986

European Journal of Biochemistry

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Instead of aqueous solutions, universally recognized in enzymology, ternary systems of the waterlorganic solvent/surfactant type are suggested as liquid-crystalline media for enzymatic reactions. Two systems, water/ octane/Aerosol OT and water/cyclohexane/Brij 96, have been used to solubilize acid and alkaline phosphatases and peroxidase. The enzymes under study do function in liquid-crystalline mesophases having lamellar, cylindrical (reversed hexagonal) and ball-shaped (reversed cubic) packing of the surfactant molecules. A significant result is that the phase transition from one liquid-crystalline structure to another entails, as a rule, a reversible change in the catalytic activity of the solubilized enzyme.There is no doubt that the lipid bilayer forms the framework of biological membranes and provides the barrier function [I]. Recently, however, a clear understanding has been achieved of the role that might be played in membranes by lipid polymorphism and local transitions between lamellar (bilayer) and hexagonal lipid phases [2 -171. The topic under discussion is the formation in membranes of hexagonally packed cylinders, in which the polar head groups of lipid molecuies line the narrow channel filled with water. It also seems possible that, inside the lipid bilayer, smaller associates of lipid molecules spring up, almost spherical and built like reversed micelles (lipid particles). The driving forces of such rearrangements in membranes and a possible biological role of non-bilayer structures were discussed in some recent reviews [14, 15,[18][19][20][21][22].These new ideas cause new enzymological problems since the overwhelming majority of enzymes in vivo function on the surface of biological membranes or inside them [23 -301. It is, therefore, important to elicit first whether enzymes can, in principle, possess catalytic activity if they are entrapped into microheterogeneous aggregates (of the types of lamellas, cylinders and/or ball-shaped micelles) built from lipid molecules. Second, whether the catalytic activity of the entrapped enzymes alters after the transition from one type of packing of lipid molecules to another.The problem of lipid dependence of enzymes has long been under discussion [31-401. As the chief regulatory factors (in addition to specific lipid-protein interactions, see for instance [41,42]), the microviscosity [35,39,401 Another regulatory factor might be the capacity of liquid crystals for polymorphism; for review, see monographs [18, 441. Indeed the structural rearrangement of the type : bilayer (L) e hexagonal phase (HI,) was recently found to influence the catalytic activity of some enzymes (phospholipases, phosphodiesterases, ATPase and manosyltransferase) entrapped into proteoliposomes [lo, 45-49] '.In our opinion, a handier way to solve the membranological problems of this kind derives from the solubilization of enzymes in microheterogeneous media of the water/organic solvent/surfactant type [22]. The point is that the amphiphilic molecules of surfactants in water/organ...

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“…[24] Interestingly, we found that the turbid emulsion became more transparent as CO 2 was added to the system under stirring, and a complete transparent emulsion was obtained when the CO 2 pressure reached 3.78 MPa at 303.2 K. Subsequently, with continuously increasing CO 2 pressure, the transparent emulsion changed into turbid again. This change can be clearly observed in Figure 1 a-g.…”

mentioning

confidence: 92%

Nanoemulsions Induced by Compressed Gases

et al. 2008

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Pressure makes the difference! Compressed gases, such as CO2, ethylene, ethane, and propane, can induce the formation of nanoemulsions with special characteristics. The application of CO2‐induced nanoemulsions in the preparation of cross‐linked porous polystyrene materials and the ability of CO2 to stabilize emulsions for enhanced oil recovery are studied. A possible mechanism for the formation of the nanoemulsions is discussed (see picture).

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The formation of molecular aggregation structures in ternary system: Aerosol OT/water/iso-octane

Cited by 108 publications

References 5 publications

The interaction between poly(vinylpyrrolidone) and reversed micelles of water/AOT/ n -heptane

The interaction between poly(vinylpyrrolidone) and reversed micelles of water/AOT/ n -heptane

Catalysis by enzymes entrapped into hydrated surfactant aggregates having lamellar or cylindrical (hexagonal) or ball‐shaped (cubic) structure in organic solvents

Nanoemulsions Induced by Compressed Gases

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