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“Snap‐Shooting” the Interface of AOT Reverse Micelles: Use of Chemical Trapping
Author(s) -
Srilakshmi Gollapudi Venkata,
Chaudhuri Arabinda
Publication year - 2000
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/1521-3765(20000804)6:15<2847::aid-chem2847>3.0.co;2-q
Subject(s) - micelle , pulmonary surfactant , molar ratio , chemistry , chemical engineering , molar concentration , chromatography , analytical chemistry (journal) , organic chemistry , aqueous solution , catalysis , biochemistry , engineering
The first use of the phenyl cation trapping technique in “snap‐shooting” the local molar concentrations of water and sulfosuccinate head‐groups in the interfacial region of AOT‐2,2,4‐trimethylpentane‐water reverse micelles has been accomplished. Our results demonstrate that the interfacial concentrations of the sulfosuccinate head‐groups in AOT (0.1 M )‐2,2,4‐trimethylpentane‐water reverse micelles are remarkably high (2.75–2.34 M ) across the W 0 (the molar ratio of water to surfactant) range 12 to 44. However, the interfacial concentrations of water in AOT‐2,2,4‐trimethylpentane‐water reverse micelles across the same range of solution compositions are significantly lower (27.9–32.0 M ) than the molar concentration of bulk water (55.5 M ). The present results provide new insight on the microenvironments of interfacially located enzymes such as lipases entrapped in AOT‐2,2,4‐trimethylpentane‐water reverse micelles, the most extensively exploited reverse‐micellar system in micellar biotechnology.