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Sensor SERS modular basado en membrana PVDF-PEI para la detección rápida in situ de metanfetamina en matrices
Xinxin Cai1, Yu Chen1, Luyun Xu1
1Key Laboratory of OptoElectronic Science and Technology for Medicine, Ministry of Education, Fujian Provincial Key Laboratory for Photonics Technology, Fujian Normal University, Fuzhou, 350117, China.
Talanta
|January 23, 2026
Resumen
Un nuevo sensor de dispersión Raman intensificada en superficie (SERS) ofrece detección rápida in situ de metanfetamina (METH) y THC. Esta plataforma portátil de inmunoensayo proporciona alta sensibilidad en muestras complejas como agua y saliva.
Área de la Ciencia:
- Química Analítica
- Ciencia de Materiales
- Ingeniería Biomédica
Sus antecedentes:
- La metanfetamina (METH), un estimulante ilícito, representa importantes riesgos para la salud pública.
- Los métodos de detección existentes (cromatografía-espectrometría de masas) son lentos, costosos y complejos para uso en campo.
- Existe una necesidad crítica de estrategias de detección de drogas in situ rápidas, sensibles y portátiles.
Objetivo del estudio:
- Desarrollar un novedoso sensor de dispersión Raman intensificada en superficie (SERS) para la detección rápida in situ de metanfetamina.
- Evaluar el rendimiento del sensor en matrices ambientales y biológicas complejas.
- Demostrar la versatilidad de la plataforma para analizar otras drogas de molécula pequeña como el THC.
Principales métodos:
- Desarrollo de un sensor SERS utilizando una membrana de polivinilideno fluoruro (PVDF)-polietilenimina (PEI).
- Se utilizó un mecanismo de inmunoensayo competitivo con nanoprobos SERS funcionalizados con anticuerpos y membranas con antígenos inmovilizados.
- Se analizaron muestras que incluyen aguas residuales domésticas, agua de lago, saliva y suero utilizando calibración adaptada a la matriz.
Principales resultados:
- Se logró un límite de detección (LOD) de 9,8 fg/mL para METH en soluciones estándar.
- Se demostraron LOD bajos en matrices complejas: 18 pg/mL en agua de lago para METH y 82 pg/mL para THC.
- El sensor mostró alta sensibilidad, selectividad y confiabilidad en diversos tipos de muestras.
Conclusiones:
- El sensor SERS basado en membrana PVDF-PEI desarrollado permite la detección eficiente y robusta de drogas ilícitas in situ.
- Su diseño modular y portabilidad lo hacen adecuado para el monitoreo ambiental, el análisis forense y las aplicaciones biomédicas.
- La plataforma ofrece una estrategia analítica prometedora para la detección de drogas de molécula pequeña y contaminantes en diversas matrices.
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