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Spectroscopic study of benzothiophene partitioning in sodium dodecyl sulfate and cetyl trimethyl ammonium bromide micellar media
Author(s) -
Hanif Sadia,
Usman Muhammad,
Hussain Ajaz,
Rasool Nasir,
Khan Abbas,
Jamal Muhammad Asghar,
Elgorban Abdallah Mohamed,
Rana Usman Ali
Publication year - 2016
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-016-1852-5
Subject(s) - chemistry , ammonium bromide , sodium dodecyl sulfate , pulmonary surfactant , partition coefficient , micellar solutions , micelle , benzothiophene , bromide , cationic polymerization , inorganic chemistry , aqueous solution , chromatography , organic chemistry , biochemistry , thiophene
This manuscript reports the partitioning of benzothiophene (BNP), a bioactive organic compound, between the aqueous phase and micellar media of an anionic surfactant, sodium dodecyl sulphate (SDS) and a cationic surfactant, cetyl trimethyl ammonium bromide (CTAB). Simple and differential UV/visible spectroscopic studies of said systems have been conducted in premicellar and post‐micellar concentration ranges. The experimental results reveal that in the premicellar region, the molecules of BNP get attached with monomeric surfactant molecules, while in the post‐micellar region; they are accommodated within the micelle. The bathochromic shift is observed in the UV/visible spectra of BNP in the presence of both surfactants. The water/micelle partition coefficient ( K x ) and binding constant ( K b ) were calculated using differential absorption data and subsequently the values of free energy of partition (∆ G p ) and free energy of binding (∆ G b ) were calculated. The values of K x show that the solubilization of BNP is more spontaneous and takes place to a greater extent in micellar media of SDS than in CTAB.