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Determination of Macrolide Antimicrobials in Infant Formulas Using a Modified Alkaline QuEChERS and High-performance Liquid Chromatography Coupled to Tandem Mass Spectrometry

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Abstract

Macrolides are antimicrobials widely used in dairy farming, classified as critically important for human and animal health, and a priority for actions against antimicrobial resistance. Infant formula is used as a substitute for breast milk and should be safe to support child growth and development. In this context, the aim of this study was to validate an analytical method for macrolide analysis in infant formulas produced from bovine milk. The fast and practical method, based on a modified QuEChERS alkaline extraction and liquid chromatography-tandem mass spectrometry, was validated according to European Community guidelines and showed to be quantitative for erythromycin, spiramycin, oleandomycin, and tylosin, while qualitative for tilmicosin. Limits of detection (LODs) for ready-to-eat infant formulas ranged from 0.04 to 0.37 ng mL−1 and limits of quantification (LOQs) from 0.15 to 1.22 ng mL−1. LODs were sufficiently low to detect residues of at least one of the assessed antimicrobials in 76.7% of the samples analyzed by the validated method.

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Funding

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001.

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Bianca Figueiredo de Mendonça Pereira: conceptualization, methodology, validation, formal analysis, investigation, resources, data curation, writing - original draft, and visualization. Mararlene Ulberg Pereira: investigation, data curation, and visualization. Rosana Gomes Ferreira: investigation, data curation, and visualization. Bernardete Ferraz Spisso: conceptualization, resources, data curation, writing- reviewing and editing, supervision, and project administration.

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Correspondence to Bernardete Ferraz Spisso.

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Bianca Figueiredo de Mendonça Pereira declares that she has no conflict of interest. Mararlene Ulberg Pereira declares that she has no conflict of interest. Rosana Gomes Ferreira declares that she has no conflict of interest. Bernardete Ferraz Spisso declares that she has no conflict of interest.

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This article does not contain any studies with humans or animals.

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de Mendonça Pereira, B.F., Pereira, M.U., Ferreira, R.G. et al. Determination of Macrolide Antimicrobials in Infant Formulas Using a Modified Alkaline QuEChERS and High-performance Liquid Chromatography Coupled to Tandem Mass Spectrometry. Food Anal. Methods 14, 719–733 (2021). https://doi.org/10.1007/s12161-020-01905-1

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  • DOI: https://doi.org/10.1007/s12161-020-01905-1

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