title: A new generation of nano-structured supramolecular solvents based on propanol/gemini surfactant for liquid phase microextraction.
abstract: A new supramolecular solvent (SUPRAS) made up of aggregates of gemini surfactant was introduced. A microextraction method, based on the SUPRAS followed with high performance liquid chromatography-ultraviolet detection, was applied for the determination of parabens in cosmetics, beverages and water samples. A SUPRAS is a nano-structured liquid made up of surfactant aggregates synthesized through a self-assembly process. In the present work, a new gemini-based SUPRAS was introduced. Methyl paraben (MP), ethyl paraben (EP), and propyl paraben (PP) were extracted on the basis of π-cation and Van der Waals interactions into the SUPRAS. The parameter affecting the extraction of target analytes (i.e., the amount of surfactant and volume of propanol as major components comprising the supramolecular solvent, sample solution pH, salt addition, ultrasonic and centrifugation time) were investigated and optimized by one-variable-at-a-time method. Under the optimum conditions, the preconcentration factors of 98, 143 and 156 were obtained for MP, EP and PP, respectively. The linearity ranged from 0.5 to 0.7-200 μg L-1with the correlation of determination of (R2) ≥ 0.9938. The gemini-based SUPRAS followed by HPLC-UV has been found to have excellent detection sensitivity with a limit of detection (LOD, S/N = 3) of 0.5 μg L-1for EP and PP, and 0.7 μg L-1for MP. Good recoveries over the range of 92.0-108.3% assured the accuracy of the amount of parabens distinguished in the non-spiked samples.
authors.affiliation: Department of Chemistry, Faculty of Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.
authors.forename: Neda
authors.initials: N
authors.lastname: Feizi
authors.affiliation: Department of Chemistry, Faculty of Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran. Electronic address: yyamini@modares.ac.ir.
authors.forename: Yadollah
authors.initials: Y
authors.lastname: Yamini
authors.affiliation: Department of Semiconductors, Materials and Energy Research Center, Karaj, Iran.
authors.forename: Morteza
authors.initials: M
authors.lastname: Moradi
authors.affiliation: Department of Chemistry, Faculty of Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.
authors.forename: Meghdad
authors.initials: M
authors.lastname: Karimi
authors.affiliation: Department of Chemistry, Faculty of Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.
authors.forename: Qamar
authors.initials: Q
authors.lastname: Salamat
authors.affiliation: Department of Chemistry, Faculty of Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.
authors.forename: Hatam
authors.initials: H
authors.lastname: Amanzadeh
mesh_terms: D001628:Beverages / Q000032:analysis; D002851:Chromatography, High Pressure Liquid; D003358:Cosmetics / Q000032:analysis; D060766:Drinking Water / Q000032:analysis; D059627:Liquid Phase Microextraction; D020005:Propanols / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry*; D062065:Wastewater / Q000032:analysis
chemical_list: D003358:Cosmetics; D060766:Drinking Water; D020005:Propanols; D012997:Solvents; D013501:Surface-Active Agents; D062065:Wastewater
keywords: Beverages; Cosmetics; Gemini surfactant; Parabens; Supramolecular solvent; Waste water