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Detection and Quantification of 4-Methyliniidazole in Cola by Matrix-assisted Laser Desorption Ionization Mass Spectrometry with Fe2O3 Nanoparticles on Zeolite

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Abstract

Food additives generally used in carbonated drinks, such as 4-methylimidazole (4MI), caffeine (Caf ), citric acid (CA), and aspartame (Apm), were measured by matrix-assisted laser desorption ionization mass spectrometry (MALDI MS) using nanometer-sized particles of iron oxide (Fe2O3 NPs). The quantification of 4MI in Coca Cola (C-cola) was carried out. In order to improve the reproducibility of the peak intensities, Fe2O3 NPs loaded on ZSM5 zeolite were used as the matrix for quantification. By using 2-ethylimidazole (2EI) as the internal standard, the amount of 4MI in C-cola was determined to range from 88 to 65 μg/355 mL. The results agree with the published value (approx. 72 μg/355 mL). It was found that MALDI using Fe2O3 was applicable to the quantification of 4MI in C-cola.

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Acknowledgments

T. F. acknowledges a Grant-in-Aid for Scientific Research (B) (No. 15H03772) from JSPS in Japan.

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Correspondence to Tatsuya Fujino.

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Fujii, Y., Ding, Y., Umezawa, T. et al. Detection and Quantification of 4-Methyliniidazole in Cola by Matrix-assisted Laser Desorption Ionization Mass Spectrometry with Fe2O3 Nanoparticles on Zeolite. ANAL. SCI. 34, 221–225 (2018). https://doi.org/10.2116/analsci.34.221

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  • DOI: https://doi.org/10.2116/analsci.34.221

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