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Copper and Iron Determination with [N,N′-Bis(salicylidene)-2,2′-dimethyl-1,3-propanediaminato] in Edible Oils Without Digestion

  • Original Paper
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Journal of the American Oil Chemists' Society

Abstract

A new method for the determination of copper(II) and iron(III) in liquid edible oils which does not require a digestion step was developed. The suggested method involves extraction of metals with [N,N′-bis(salicylidene)-2,2′-dimethyl-1,3-propanediaminato] (LDM) followed by flame atomic absorption spectrometry measurement. As a first step, metal complexes of copper(II) and iron(III) ions with LDM were investigated spectrophotometrically. After the analytical properties and experimental conditions of the complexation had been determined, these findings were used to determine the extraction period as a second step. Experimental conditions were optimized using a central composite design. Optimum conditions for Cu(II) and Fe(III) extractions from oil were found: the ratios of the volume of Schiff base solution used to the mass of oil (V LDM/m oil; mL g−1) were 0.76 and 1.19 mL g−1, the stirring times were 73 and 67 min, and the temperatures were 31 and 28 °C, respectively. The developed extraction and determination method was tested on certified reference materials; the recovery percentages were found to be 99.4 ± 2.8 and 100.2 ± 5.6 for Cu(II) and Fe(III), respectively. The suggested method was performed on real samples such as olive oil, sunflower oil, corn oil, canola oil and recovery values between 97.2–102.1 for Cu(II) and 94.5–98.6 for Fe(III) were determined. It was concluded that the developed method has some advantages over the common traditional method including rapidity, sensitivity, accuracy, reduced risk and cost.

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Acknowledgments

The authors would like to thank the Research and Application Center for Environmental Concern of Balıkesir University. Dr. Mahir Alkan and Dr. Raif Kurtaran are also gratefully acknowledged. This study was supported by the Scientific and Technological Research Council of Turkey (Tübitak-TBAG project number: 105T153).

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Authors and Affiliations

  1. Institute of Science and Technology, Balıkesir University, Çağış, 10145, Balıkesir, Turkey

    Eda Köse Baran

  2. Chemistry Department, Faculty of Science and Arts, Balıkesir University, Çağış, 10145, Balıkesir, Turkey

    Sema Bağdat Yaşar

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  1. Eda Köse Baran
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  2. Sema Bağdat Yaşar
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Correspondence to Sema Bağdat Yaşar.

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Baran, E.K., Yaşar, S.B. Copper and Iron Determination with [N,N′-Bis(salicylidene)-2,2′-dimethyl-1,3-propanediaminato] in Edible Oils Without Digestion. J Am Oil Chem Soc 87, 1389–1395 (2010). https://doi.org/10.1007/s11746-010-1633-7

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  • DOI: https://doi.org/10.1007/s11746-010-1633-7

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