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Title

MICROEXTRCTION OF CYHALOTHRIN AND FENPROPATHRIN FROM ENVIRONMENTAL SAMPLES USING NOVEL GEMINI SURFACTANT BASED SUPRAS AND DETERMINATION WITH HPLC-UV

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Abstract

 SELFASSEMBLY, THE PROCESS BY WHICH SUPRAMOLECULAR SOLVENTS (SUPRAS) WITH AN ORDERED STRUCTURE ARE PRODUCED, PROVIDES UNIQUE OPPORTUNITIES TO OBTAIN TAILORED SOLVENTS WITH ADVANCED FUNCTIONAL FEATURES. A NEW BRANCH OF SURFACTANTS, CALLED GEMINI SURFACTANTS, ARE DOUBLE-CHAIN AMPHIPHILES THAT CONTAIN TWO HYDROPHILIC GROUPS (IONIC HEAD) CONNECTED WITH A SPACER AND TWO HYDROCARBON TAIL. THESE SURFACTANTS ARE SUPERIOR TO CONVENTIONAL SINGLE-CHAIN SURFACTANTS AS THEY POSSESS: (I) ABOUT ONE TO TWO ORDERS OF MAGNITUDE SMALLER VALUES OF CRITICAL MICELLE CONCENTRATION (CMC), (II) HIGHER TENDENCY TO ADSORB AT THE SURFACE, (III) IMPLYING BETTER DISPERSING AND EMULSIFYING PROPERTIES. IN THIS WORK, GEMINI SURFACTANT BASED SUPRAS WERE SYNTHESIZED AND THEIR POTENTIAL FOR ANALYTICAL EXTRACTIONS WAS ASSESSED. THE COMPOSITION OF THE SOLVENT CAN BE TAILORED BY CONTROLLING THE PROPANOL: WATER RATIO IN THE BULK SOLUTION FOR GEMINI SELFASSEMBLY. EXTRACTION EFFICIENCY OF THE NOVEL PROPOSED GEMINI SURFACTANT BASED SUPRAS WERE INVESTIGATED FOR TWO PYRETHROID INSECTICIDES, CYHALOTHRIN AND FENPROPATHRIN, AS MODEL ANALYTES. THE FENPROPATHRIN AND CYHALOTHRIN WERE EXTRACTED USING NOVEL SUPRAS. THE EXTRACTED ANALYTES WERE INJECTED INTO HPLC-UV FOR SEPARATION AND DETECTION OF THE ANALYTES.SEVERAL PARAMETERS AFFECTING THE SUPRAS PROCESS INCLUDING PROPANOL: WATER RATIO, CONCENTRATION OF SURFACTANT, SALT EFFECT AND TIME OF CENTRIFUGATION WERE INVESTIGATED AND OPTIMIZED. UNDER THE OPTIMIZED CONDITIONS THE LINEARITY OF OF THE METHOD IN THE RANGE OF 2-200MG L-1 FOR BOTH OF CYHALOTHRIN AND FENPROPATHRIN, WITH CORRELATION OF DETERMINATION (R2) 0.9996 AND 0.9997 WERE OBTAINED RESPECTIVELY.

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