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Validación de una metodología analítica para determinar bifenilos policlorados en muestras de plasma sanguíneo

Authors: Ávila, Boris Santiago; Ramírez, Carolina;

Validación de una metodología analítica para determinar bifenilos policlorados en muestras de plasma sanguíneo

Abstract

Resumen Introducción. Los bifenilos policlorados se encuentran entre los cinco contaminantes orgánicos persistentes más tóxicos para los organismos vivos, según la Agency for Toxic Substances and Disease Registry (ATSDR) de los Estados Unidos. Objetivo. Estandarizar y validar un método analítico para la determinación y cuantificación de los bifenilos policlorados indicadores en muestras de plasma sanguíneo, mediante cromatografía de gases acoplada a espectrometría de masas. Materiales y métodos. Se fortificó un pool de plasma para hacer los ensayos en la matriz. Además, se utilizó el material de referencia NIST SRM ® 1958 (Organic Contaminants in Fortified Human Serum, Freeze-Dried) para los ensayos de veracidad y precisión intermedia. Resultados. Los porcentajes de recuperación obtenidos con la metodología estuvieron entre 88,4 y 97,5 %, y el sesgo fue menor del 20 %. Los límites de detección y cuantificación de los bifenilos policlorados indicadores policlorados fueron de 0,04 µg/L y 0,10 µg/L, respectivamente. La linealidad representada por el coeficiente de determinación (R2) varió entre 0,9866 y 0,9886. La precisión expresada como desviación estándar relativa fue menor del 20 % en todo el rango lineal de trabajo (0,5-500 µg/L). Por último, se analizaron 115 muestras de población colombiana de diferentes zonas del país y se encontraron 65 muestras positivas, de las cuales dos estuvieron por encima de los valores de control biológico en humanos (Human Biomonitoring Values, HBM- II): 7,0 µg/L, 2XΣPCB 138, 153, 180 , y otras dos, por encima del HBM-I: 3,5 µg/L, 2XΣPCB 138, 153, 180. Conclusión. El método desarrollado resultó ser preciso para el análisis de los bifenilos policlorados en muestras de plasma sanguíneo y se puede utilizar para el control biológico de estos contaminantes en población colombiana. Abstract Introduction: Polychlorinated biphenyls are among the five most toxic persistent contaminants for living organisms according to the Agency for Toxic Substances and Disease Registry (ATSDR). Objective: To standardize and validate an analytical method to determine and quantify polychlorinated biphenyl indicators in samples from blood plasma by means of gas chromatography-mass spectrometry. Materials and methods: We fortified a plasma pool to do the matrix assays. Additionally, we used the NIST SRM® 1958 reference material for the veracity and intermediate accuracy assays. Results: Methodology recovery percentages ranged between 88.4 and 97.5%, and the bias was less than 20%. Detection and quantification limits were 0.04 µg/L and 0.10 µg/L, respectively, for all polychlorinated biphenyl indicators. The linearity represented by the determination coefficient (R2 ) varied between 0.9866 and 0.9886. Accuracy, expressed as relative standard deviation was less than 20% in all the linear work range (0.5-500 µg/L). Finally, we analyzed 115 samples from Colombian population in various zones of the country and we found 65 positive samples, from which two samples were above HBM-II (7.0 µg/L, 2XΣPCB 138, 153, 180), and two, above HBM-I (3.5 µg/L, 2XΣPCB 138, 153, 180 ). Conclusion: The method we developed is accurate for PCB analysis in blood plasma samples and could be used for biological surveillance of these contaminants in the Colombian population.

Keywords

Polychlorinated biphenyls, blood, química analítica, espectrometría de masas, chemistry, analytical, sangre, bifenilos policlorados, cromatografía de gases, plasma, chromatography, gas, mass spectrometry

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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