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Analytical Procedures for the Determination of Aflatoxin B1 in Eggs of Laying Hens Using Immunoaffinity Columns and Liquid Chromatography with Post-Column Derivatisation and Fluorescence Detection

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Abstract

An analytical procedure for the determination of aflatoxin B1 in eggs was introduced and validated in laboratory 1. The method consisted of the extraction of aflatoxin B1 from a sample, purification of the extract with solvents, immunoaffinity column cleanup and the determination by liquid chromatography with post-column bromination and fluorescence detection at λ ex  = 362 nm and λ em  = 425 nm. The method was transferred to laboratory 2, where it was modified and validated. The limit of detection (LOD) and limit of quantification (LOQ) obtained in laboratory 1 were 2 and 6 ng/kg, respectively, and 2 and 5 ng/kg in laboratory 2, respectively. The repeatability of measurements in laboratory 1, represented by differences between results of duplicate measurements, was 10 ng/kg at the contamination level of 50 ng/kg. At the same concentration level, the standard deviation (s R) and the relative standard deviation (RSD R) for the within-laboratory reproducibility were 5.5 ng/kg and 11 %, respectively, and the measurement uncertainty was ±10 ng/kg. The mean recovery was 70 %. In laboratory 2, the repeatability of measurements at the contamination level of 20 ng/kg, represented by the standard deviation (s R), repeatability (r) and relative standard deviation (RSD R) was 4 ng/kg, 11 ng/kg and 20 %, respectively, and the recovery was 67 %. The results indicate that the procedures are suitable for the determination of aflatoxin B1 in eggs and can be implemented for the routine analysis. Using the procedure validated in laboratory 1, 25 samples from farms in Slovenia were analysed. In none of the analysed samples, aflatoxin B1 was detected.

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Conflict of interest

Katarina Pavšič-Vrtač declares that she has no conflict of interest. Suvi Ojanperä declares that she has no conflict of interest. Juha Apajalahti declares that he has no conflict of interest. Karin Šrimpf declares that she has no conflict of interest. Gabrijela Tavčar-Kalcher declares that she has no conflict of interest. This article does not contain any studies with human or animal subjects.

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Authors and Affiliations

  1. National Veterinary Institute, University of Ljubljana, Veterinary Faculty, Gerbičeva 60, 1115, Ljubljana, Slovenia

    Katarina Pavšič-Vrtač, Karin Šrimpf & Gabrijela Tavčar-Kalcher

  2. Alimetrics Ltd, Koskelontie 19 B, 02920, Espoo, Finland

    Suvi Ojanperä & Juha Apajalahti

Authors
  1. Katarina Pavšič-Vrtač
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  2. Suvi Ojanperä
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  3. Juha Apajalahti
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  4. Karin Šrimpf
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  5. Gabrijela Tavčar-Kalcher
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Correspondence to Gabrijela Tavčar-Kalcher.

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Pavšič-Vrtač, K., Ojanperä, S., Apajalahti, J. et al. Analytical Procedures for the Determination of Aflatoxin B1 in Eggs of Laying Hens Using Immunoaffinity Columns and Liquid Chromatography with Post-Column Derivatisation and Fluorescence Detection. Food Anal. Methods 7, 1917–1924 (2014). https://doi.org/10.1007/s12161-014-9836-4

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  • DOI: https://doi.org/10.1007/s12161-014-9836-4

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