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Agentes de derivación para el análisis LC-MS de aminoácidos: efectos de la estructura del núcleo y los grupos
Tereza Hofmanova1, Rudolf Andrys2, Miroslav Lisa1
1Department of Chemistry, Faculty of Science, University of Hradec Kralove, Rokitanskeho 62, 50003, Hradec Kralove, Czech Republic.
Analytical and bioanalytical chemistry
|February 10, 2026
Resumen
El análisis preciso de aminoácidos en muestras biológicas es difícil. Los investigadores desarrollaron un agente de derivación estable y eficaz, 6-CiQ-NHS, para una detección y cuantificación mejoradas utilizando espectrometría de masas de cromatografía líquida (LC-MS).
Área de la Ciencia:
- Química Analítica La Química Analítica es la
- La bioquímica es la bioquímica.
- Espectrometría de masas por espectrometría de masas.
Sus antecedentes:
- El análisis de aminoácidos en muestras biológicas enfrenta desafíos debido a la alta polaridad, la baja eficiencia de ionización y la falta de cromóforos.
- La derivación es crucial para mejorar la retención, sensibilidad y detección de aminoácidos a través de técnicas como LC-UV o LC-MS.
Objetivo del estudio:
- Evaluar sistemáticamente los agentes de derivación basados en piridina, quinolina y andamios de isoquinolina con varios grupos reactivos (COCl, SO2Cl, éster NHS).
- Identificar un agente de derivación superior para mejorar la cuantificación de aminoácidos en muestras biológicas.
Principales métodos:
- Evaluación de agentes de derivación utilizando aminoácidos etiquetados con deuterio para evaluar la estabilidad, la eficiencia, la cromatografía y la respuesta a la EM.
- Análisis de cromatografía líquida-espectrometría de masas (LC-MS) para determinar la linealidad, los límites de detección y la separación de los aminoácidos isoméricos.
Principales resultados:
- Los agentes a base de ésteres del NHS demostraron una estabilidad superior (>1 año), a diferencia de los agentes de cloruro de carbonilo y cloruro de sulfonilo menos estables.
- El éster del ácido isoquinolina-6-carboxílico del NHS (6-CiQ-NHS) fue identificado como el agente más efectivo, ofreciendo una derivación rápida, una fuerte señal de EM y estabilidad.
- El análisis LC-MS con 6-CiQ-NHS mostró una excelente linealidad (R2 ≥ 0.995), bajos límites de detección nanomolar (0.23-6.33 nM) y una separación exitosa de aminoácidos isoméricos.
Conclusiones:
- 6-CiQ-NHS es un agente de derivación práctico y eficaz para la cuantificación de aminoácidos.
- El estudio proporciona un marco para el diseño racional de nuevos agentes de derivación para el análisis de aminoácidos.
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