Abstract
Recently, we showed that the hydrolysis of some esters catalyzed by α-chymotrypsin entrapped in sodium bis(2-ethylhexyl)sulfosuccinate (AOT) microemulsions is enhanced at low water-surfactant molar ratio w 0 ( = [H 2O]/[AOT]) and that the internal interface structure and the oligomeric phase of the AOT microemulsions below this w 0 range would play an important role for the acceleration of the metabolic turnover. To clarify the relation between the appearance of superactivity and the internal structures of the AOT microemulsions, we have carried out small-angle neutron-scattering experiments. In this report, we treat the AOT/water/hexane or heptane system by using solvent-contrast variation method, and we discuss a change of the excluded volume of AOT molecule at low w 0 value.
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