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    Determination of copper in rose tea samples using flame atomic absorption spectrometry after emulsification liquid-liquid microextraction
    (Elsevier Sci Ltd, 2024) Kartoglu, Bedrihan; Bodur, Suleyman; Zeydanli, Damla; Gover, Tugce; Ozaydin, Ecem; Bakirdere, Emine Gulhan; Bakirdere, Sezgin
    Rose tea infusion has gained popularity worldwide due to its health benefits. However, it is known that tea plants can be contaminated with heavy metals including copper. Hence, an accurate and applicable analytical method namely emulsification liquid-liquid microextraction based deep eutectic solvent - flame atomic absorption spectrometry (ELLME-DES-FAAS) was proposed to determine copper at trace levels in rose tea samples. Under the optimum experimental conditions, analytical figures of merit for the developed method were examined, and dynamic range, limit of detection (LOD) and limit of quantification (LOQ) were found to be 5.07-246.61 mu g/kg (mass-based) with 0.9992 coefficient of determination, 2.50 mu g/kg and 8.32 mu g/kg, respectively. A matrix matching calibration strategy was employed to boost recovery results, and the acceptable recovery results were recorded between 95.9 % and 118.4 %. According to recovery results, the developed analytical method can be safely employed to determine the concentration of copper in rose tea samples accurately.
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    Dispersive solid phase extraction and quadruple isotope dilution-mass spectrometry combination for the accurate and sensitive quantification of capsaicin in pepper, domestic wastewater and human saliva samples by GC-MS system
    (ELSEVIER, 16.12.2024) Bodur, Suleyman; Bodur, Sezin Erarpat; Gursoy, Selim; Ayyildiz, Merve Firat; Kartoglu, Bedrihan; Akbiyik, Hilal; Gunkara, Omer Tahir; Bakirdere, Sezgin
    In the presented study, reduced graphene oxide/Fe3O4 (rGO/Fe3O4) nanocomposites based dispersive solid phase extraction (DSPE) - gas chromatography-mass spectrometry (GC-MS) method was developed for the determination of capsaicin in domestic wastewater (DW), pepper (PP) and human saliva (HS) samples. All important parameters of the DSPE method affected the preconcentration factor were carefully optimized to achieve high signal to noise ratio for the analyte. After the optimization studies, the system analytical performance of DSPEGC-MS system was evaluated using the aqueous standard solution of capsaicin. Limit of detection (LOD), limit of quantitation (LOQ) and dynamic range were figured out to be 0.54 mu g/kg, 1.80 mu g/kg and 2.66 - 487.35 mu g/kg, respectively. Under the optimum experimental conditions, recovery studies were conducted with the spiked DW, PP and HS samples, and percent recovery results were recorded between 52.6 % and 183.6 % via matrix matching calibration strategy. After the implementation of ID4 strategy, percent recovery results for the spiked DW, PP and HS samples were calculated as 98.2 %-99.3 %, 99.7 %-100.7 % and 99.4 %-99.8 %, respectively. In addition, capsaicin content in Sivri (S)-PP, Kil (K)-PP and Samandag (SA)-PP samples were found to be 309.5 +/- 11.8 mg/kg, 873.7 +/- 26.7 mg/kg and 165.3 +/- 5.1 mg/kg via DSPE-GC-ID4-MS method, respectively. As a result, the combination of quadruple isotope dilution (ID4) strategy and the DSPE-GC-MS method were successfully performed to boost the accuracy and precision of developed DSPE-GC-MS method.