Chemometric study and optimization of heads pace solid-phase microextraction parameters for the determination of multiclass pesticide residues in processed cocoa from Nigeria using gas chromatography/mass spectrometry

Abdulra'uf, L.B. and Guan, H.T. (2014) Chemometric study and optimization of heads pace solid-phase microextraction parameters for the determination of multiclass pesticide residues in processed cocoa from Nigeria using gas chromatography/mass spectrometry. In: Vietnam Malaysia International Chemical Congress (VMICC), 07-09 Nov 2014, Hanoi, Vietnam.. (Submitted)

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Abstract

Solid-phase microextraction (SPME) is a solventless sample preparation method that combines sample preparation, isolation, concentration, and enrichment into one step. A simple and effective method coupling headspace-SPME to GC/MS was developed for the analysis of chlorpyrifos, fenitrothion, endosulfan I, and endosulfan " pesticide residues in cocoa powder. In this study, multivariate strategy was used to determine the significance of the factors affecting the SPME of the pesticides using a Plackett-Burman design, and the significant factors were optimized using central composite design. The analytes were extracted with 100 pm polydimethylsiloxane fibers according to the factorial design matrix and desorbed into a GC/MS instrument The developed method was applied for the analysis of a cocoa powder sample, and it exhibited good figures of merit for the analytical methodology. Using the optimized conditions, the linearity ranged from 2.5 to 500 pg/kg (R2> 0.99) using an internal standard calibration method, and the average recoveries were between 75 and 95%, with RSD values between 3.8 and 9.7%.

Item Type: Conference or Workshop Item (Paper)
Funders: UNSPECIFIED
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Science > Department of Chemistry
Depositing User: Mr. Mohd Samsul Ismail
Date Deposited: 18 Dec 2014 03:52
Last Modified: 18 Dec 2014 03:52
URI: http://eprints.um.edu.my/id/eprint/11418

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