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Dioxins in beef samples from Mexico using a low resolution GC/MS screening method.

Lidia Naccha1, Guadalupe Alanis, Anabel Torres

  • 1a Universidad Autónoma de Nuevo León , Facultad de Medicina, Departamento de Química Analítica , Avenida Madero y Dr. Aguirre Pequeño S/N, Col. Mitras Centro, Monterrey , Nuevo León , México.

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Summary

Dioxins in Mexican beef samples exceeded European Union limits, indicating potential food contamination. High-resolution gas chromatography coupled to low-resolution mass spectrometry (GC/LRMS) is a viable screening method for these persistent organic pollutants.

Keywords:
GC/MSTEQsanimal productschromatographydioxinsmeatmethod validationquality assurance

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Area of Science:

  • Environmental Chemistry
  • Food Safety Analysis

Background:

  • Dioxins, including polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs), are persistent organic pollutants with significant health implications.
  • Monitoring dioxin levels in food products like beef is crucial for public health and regulatory compliance.

Purpose of the Study:

  • To quantify dioxin levels in beef samples from Mexico.
  • To evaluate the suitability of high-resolution gas chromatography coupled to low-resolution mass spectrometry (GC/LRMS) as a screening method for dioxins in beef.
  • To compare detected levels with European Union regulatory limits.

Main Methods:

  • Beef samples were analyzed using high-resolution gas chromatography coupled to low-resolution mass spectrometry (GC/LRMS).
  • Analytical procedures were based on the USEPA 1613 method with minor modifications.
  • Quantification was expressed in picograms of WHO-Toxic Equivalents per gram of fat (pg WHO-TEQ PCDDs/PCDFs g(-1) fat).

Main Results:

  • Dioxin levels in the analyzed beef samples ranged from 1.02 to 8.04 pg WHO-TEQ PCDDs/PCDFs g(-1) fat.
  • Several samples exceeded the European Union's maximum allowed limit of 3 pg WHO-TEQ PCDDs/PCDFs g(-1) fat, suggesting potential food contamination.
  • This study represents the first report of dioxin levels in beef within Mexico.

Conclusions:

  • The GC/LRMS method is confirmed as a suitable preliminary screening tool for detecting dioxins in beef.
  • The findings highlight the need for further investigation and potential regulatory action regarding dioxin contamination in beef in Mexico.
  • The methodology shows promise as an alternative screening method for PCDD/Fs in other food matrices.