Sodium bis-2-ethylhexyl sulphosuccinate

The most commonly used anionic surfactant in reversed micelles for the extraction of proteins is AOT [sodium bis(2-ethylhexyl)sulphosuccinate]... 

As an example of the use of reverse micelles, chymotrypsin has been enclosed in reverse micelles formed with sodium bis-(2-ethylhexyl)sulphosuccinate (7.96) and used to catalyse the synthesis of Z—Ala—Phe—Leu—NH2 from Z—Ala—Phe— OMe and H—Leu—NH2 with isooctane as the bulk organic phase. 

All the systems described thus far require relatively high salinity, which is considered to be critical in soil remediation processes [60]. Another approach for effective microemulsification of organic liquids is the use of co-surfactants. Sodium mono- and dimethyl naphthalene sulphonate were found to be effective co-surfactants in formulations with Aerosol OT (sodium bis(2-ethylhexyl) sulphosuccinate) for diverse chlorinated hydrocarbons and their mixtures between 15 and 25°C [60, 61]. All types of microemulsions could be obtained with this approach. 

Dealing with the sulphosuccinate diester synthesis, the esterification procedure is performed very similar to that described above for monoesters but the feed of hydroxyl-bearing material (generally Ce-u alcohols) should be twice more with respect to maleic anhydride. The first step is performed under a gradually increasing temperature to 120-150 °C and with continuous vacuum distillation of water from esterification. At that step esterification catalyst may be used, such as /7-toluenesulphonic acid or ABSA. The sulphonation with sodium bisulphite proceeds as described above. A representative example of diesters is sodium bis(2-ethylhexyl) sulphosuccinate known as Aerosol OT of the formula ... 

The phase behaviour of double chain surfactants such as sodium bis(2-ethylhexyl)sulphosuccinate is very different (Figure 3.17). The most important feature of the phase diagram is the large area of the lamellar phase, which extends over a wide concentration range. This lamellar phase is followed by a bicontinuous cubic phase and then a reversed hexagonal phase. 

SBO SOBITAL SODIUM BIS(2-ETHYLHEXYL) SULFOSUCCINATE SODIUM DI-(2-ETHYLHEXYL) SULFOSUCCINATE SODIUM DIOCTYL SULFOSUCCINATE SODIUM DIOCTYL SULPHOSUCCINATE... 

Anionic surfactants are the most commonly used type in the emulsion polymerization. These include sulfates (sodium lauryl sulfate), sulfonates (sodium dodecylbenzene sulfonate), fatty acid soaps (sodium or potassium stearate, laurate, palmitate), and the Aerosol series (sodium dialkyl sulphosuccinates) such as Aerosol OT (AOT, sodium bis(2-ethylhexyl) sulfosuccinate) and Aerosol MA (AMA, sodium dihexyl sulphosuccinates). The sulfates and sulfonates are useful for polymerization in acidic medium where fatty acid soaps are unstable or where the final product must be stable toward either acid or heavy-metal ions. The AOT is usually dissolved in organic solvents to form the thermodynamically stable reverse micelles. [22] Nonionic surfactants usually include the Brij type, Span-Tween 80 (a commercial mixture of sorbitol monooleate and polysorbate 80), TritonX-100[polyoxyethylene(9)4-(l,l,3,3-tetramethylbutyl)-phenyl... 

At pH 7.0, for the chymotrypsin (EC 3.4.21.1) catalysed hydrolysis of A -acetyl-L-tryptophan methyl ester in water pools, consisting of 0.11 m bis-(2-ethylhexyl) sodium sulphosuccinate (AOT or Aerosol OT) and 2.8 m water, in heptane is reduced 44-fold and K is increased ca. 3-fold compared with bulk water. The sigmoidal pH-rate profile is shifted to higher pH by 1.5 units compared with bulk water which accounts for the lower activity of pool incorporated enzyme at pH 7.0. At higher pH, is larger in water pools and independent of pool size, which suggests that the enzyme molecules create their own micelles in the heptane rather than occupying ones already present. ... 

Chymotrypsin (EC 3.4.21.1), trypsin (EC 3.4.21.4), inorganic pyrophosphatase (EC 3.6.1.1), lactate dehydrogenase (EC 1.1.1.27), pyruvate kinase (EC 2.7.1.40) and peroxidase (EC 1.11.1.7) may be incorporated into reversed micelles of bis(2-ethylhexyl) sodium sulphosuccinate and cetyltrimethylammonium bromide in aprotic solvents with retention of their catalytic activity and specificity. ... 

Water pooled in reverse micelles enhances the rate of the imidazole catalysed hydrolysis of 4-nitrophenyl acetate. The rate of acylation of amines in apolar solvents is enhanced more by cationic micelles than by bis(2-ethylhexyl) sodium sulphosuccinate, and may be treated by the pseudophase model. ... 

Sulphosuccinic acid, bis(2-ethylhexyl)ester, sodium salt... 

Name SULPHOSUCCINIC ACID, BIS(2-ETHYLHEXYL) ESTER, SODIUM SALT PMNr 91572 CAS Nr 00577-11-7... 

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