Journal
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
Volume 22, Issue 4, Pages 343-346Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jfca.2008.11.017
Keywords
Copper; Zinc; Box-Behnken design; Microwave-assisted extraction; Wheat flour; Corn flour; Determination of metal in food; Food composition; Food safety
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This article describes the application of response surface methodology (RSM) to the development of a procedure for zinc and copper determination by flame atomic absorption spectrometry (FAAS) in food samples after extraction by a microwave system. A Box-Behnken matrix was used to find optimal conditions for the procedure through a response surface study. Three variables irradiation power; time; and temperature were regarded as factors in the optimization study. The working conditions were established as a compromise between optimum values found for each analyte taking into consideration the robustness of the procedure. These values were 97 degrees C, 90 W and 9.0 min, for temperature, irradiation power and time, respectively. The accuracy of the optimized procedure was evaluated by the analysis of certified reference materials. The method was applied to the determination of copper and zinc in wheat flour and corn flour samples. (C) 2009 Elsevier Inc. All rights reserved.
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