17 178 and 374 522 respectively good reproducibility

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Unformatted text preview: ysia ANA-P22 23rd-25th June 2010 DEVELOPMENT OF A MICELLAR ELECTROKINETIC CHROMATOGRAPHY (MEKC) METHOD FOR THE ANALYSIS OF FURFURALS Noorfatimah Yahaya, Khaldun M. Al Azzam, Ahmad Makahleh and *Bahruddin Saad School of Chemical Sciences, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia E-mail: [email protected] A convenient and simple method for the analysis of six furfurals (5 -hydroxmethylfurfural, 2-furaldehyde, 3-furaldehyde, 5-methylfurfural, 2-furoic acid and 3-furoic acid) was developed using micellar electrokinetic chromatography (MEKC) method. The furfurals were separated by using 75 mM phosphate buffer (pH 7.1) containing 200 mM SDS as background electrolyte, at 22 kV and at 20 °C. The furfurals were separated in less than 15 minutes. The wavelengths used were 200 nm (2-FA and 3-FA) and 280 nm (5-HMF, 2-F, 3-F, 5-MF). Correlation coefficients of the linear regression were above 0.99 for all the furfurals and the detection limits were in the range from 0.209 to 0.849 pp m. Intra-day precisions of peak area were calculated by means of percentage relative stand ard deviation ranged from 1.13 to 16.65 %. A sample of pineapple juice was analyzed and was found to contain 9.65 ppm of 5 hydroxymethylfurfural. The MEKC method can be used for the quantification of furfurals in juices as it is simple, fast and uses minimum amounts of solvents. ANA-P23 DETERMINATION OF ORGANOPHOSPHORUS PESTICIDES IN FRUIT BEVERAGES USING SOLVENT BAR MICROEXTRACTION TECHNIQUE Ayman AL-Majid, *Chanbasha Basheer and Khalid AL-Hoosani Department of Chemistry, King Fahd University of Petroleum & Minerals, P.O. Box 1059, Dhahran 31261, Saudi Arabia E-mail: [email protected] In recent years, there has been a growing interest in the use of poro us membrane in the sample preparation methods. More commonly reported solvent based membrane extractions are liquid -phase microextraction (LPME) and solvent bar microextraction (SBME). These techniques are simple and inexpensive, provide high...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.

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