Abstract
In the present work a novel methodology for the determination of Fe, Mn, and Zn by flame atomic absorption spectrometry in samples of spirulina, commercialized as a food supplement, was developed. Variables involved in the sample preparation were optimized using the Doehlert design and desirability function. The developed method presented quantification limits of 18, 5.3, and 8.6 mg kg−1, precision, expressed as repeatability (%RSD, 0.5 mg kg−1, N = 5) of 1.3; 1.8 and 2.3% respectively for Fe, Mn, and Zn. Accuracy was assessed by addition/recovery test, comparison with another method adopted as standard, and analysis of certified reference materials (Apple leaves NIST1515, and Pinus leaves NIST 1575a), showing that the method presents adequate accuracy for the determination of the elements studied. The concentrations of Fe, Mn, and Zn found were in the ranges from 52.5 to 836; 7.50 to 40.2, and 13.7 to 25.0 mg kg−1 respectively.
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Acknowledgements
Authors acknowledge the financial support of the Fundação de Amparo à Pesquisa do Estado da Bahia (FAPESB). Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq. Grant Number 304582/2018-2) and Financiadora de Estudos e Projetos (FINEP).
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This research was supported by the Brazilian National Research Council (CNPq) (Grant Number 310949/2021–1).
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UMFMC: Conceptualization, experimental analysis, data analysis, and writing. MAB: Conceptualization, methodology, data analysis, writing, review, and editing. BNS: experimental analysis. CGN: data analysis, writing, review, and editing. ERVA: experimental analysis and writing. SAA: Data analysis, writing, review, and editing.
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Cerqueira, U.M.F.M., Bezerra, M.A., Silva, B.N. et al. Multivariate optimization of a method based on slurry sampling for determination of Fe, Mn and Zn in spirulina (Arthrospira sp.) samples. Food Measure 17, 5322–5329 (2023). https://doi.org/10.1007/s11694-023-02034-z
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DOI: https://doi.org/10.1007/s11694-023-02034-z