Published:Journal of Chromatographic Science,
ISSN 0021-9665 Volume
46, Number 4, April 2008, pp. 298-303
Silica Thin-Layer Chromatographic Studies of
Surfactants with Mixed Aqueous-Organic Eluents Containing Thiourea:
Simultaneous Separation of Co-existing Cetyltrimethylammonium
Bromide, Dodecyltrimethylammonium Bromide, and Polyoxyethylene
(20) Sorbitan Monolaurate
A. Mohammad and S.A. Bhawani
Analytical Research Laboratory, Department of Applied Chemistry,
Faculty of Engineering & Technology, Aligarh Muslim University,
Aligarh-202 002, India
Silica thin-layer chromatography of three surfactants
using various solvent systems is described. The mutual separation
of coexisting cetyltrimethylammonium bromide (CTAB), dodecyltrimethyl-ammonium
bromide (DTAB), and polyoxyethylene (20) sorbitan monolaurate
(Tween 20) is achieved on silica layer using 5% aqueous thiourea–acetone–methanol
(60:20:20,v/v/v) as the mobile phase. The effect of the carbon
chain length of alcohols (methanol, ethanol, n-propanol,
and
n-butanol) on the mobility of these surfactants is examined
on silica layers. The comparative study is performed with sulfur-
(thiourea) and oxygen- (urea) containing compounds in the eluent
on the mobility as well as on the separation of co-existing CTAB,
DTAB, and Tween 20. The interference on the resolution of the
mixture of CTAB, DTAB, and Tween 20, due to presence of metal
cations as impurities, is also examined. The limits of detection
of CTAB, DTAB, and Tween 20 are estimated.
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