Fırat Ayyıldız, MerveKaraman, Devrim NurKartoğlu, BedrihanŞaylan, MeltemChormey, Dotse SelaliBakırdere, Sezgin2023-07-262023-07-262023Fırat Ayyıldız, M., Karaman, D. N., Kartoğlu, B., Şaylan, M., Chormey, D. S. & Bakırdere, S. (2023). A simple microwave-assisted synthesis of cobalt ferrite nanoparticles and its application for the determination of lead ions in rooibos (Aspalathus linearis) tea. Food Chemistry, 429, pp. 1-7. https://doi.org/10.1016/j.foodchem.2023.1368620308-81461873-7072https://doi.org/10.1016/j.foodchem.2023.136862https://hdl.handle.net/20.500.13055/500In this study, a magnetic sorbent assisted dispersive solid phase extraction (DSPE) method was used to preconcentrate lead ions from rooibos tea samples for determination by slotted quartz tube-flame atomic absorption spectrometry (SQT-FAAS). Cobalt ferrite magnetic nanoparticles (CoFe2O4 MNPs) were synthesized by microwave assisted digestion. Limits of detection and quantification were calculated as 5.3 and 17.6 µg/L, respectively, in a linear dynamic range of 20–800 µg/L. The enhancement factor of the developed method was found to be 80- folds when compared to the detection limit of the regular FAAS system. The percent recoveries obtained for rooibos tea samples spiked at different concentrations were in the range of 77 – 125%, with high repeatability as indicated by low standard deviations. The findings of the study demonstrated that the CoFe2O4 MNPs-based extraction method is a straightforward, fast, affordable, safe, and eco-friendly approach to qualifying/quantifying lead with high precision in the selected beverage sample.eninfo:eu-repo/semantics/closedAccessCobalt Ferrite Magnetic NanoparticlesDispersive Solid Phase ExtractionFlame Atomic Absorption SpectrometerRooibos TeaArticle10.1016/j.foodchem.2023.13686242917Q1WOS:0011498219000012-s2.0-85165416088PMID: 37478598Q1