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- John J. Castillo, Angie E. Orduz, Ciro E. Rozo, Caracterización del conjugado no covalente de grafeno y ácido fólico mediante espectroscopia Raman y métodos computacionales , Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales: Vol. 42 Núm. 162 (2018)
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Se desarrolló un novedoso método electroquímico para la detección rápida y analítica de Staphylococcus aureus en cultivos y muestras de leche enriquecidas con peróxido de hidrógeno (H2O2) mediante el consumo de péroxido por electrodos serigrafiados de oro (ESO) modificados con cisteína y peroxidasa de pasto Guinea (PPG). La peroxidasa de las hojas del pasto Guinea, con una actividad específica de 470 U mg-1, se inmovilizó sobre la superficie de los ESO previamente modificada con cisteína. Los voltamperogramas cíclicos de los ESO modificados con PPG y cisteína en presencia de ferrocianuro de potasio como sonda redox exhibieron un incremento en la corriente de aproximadamente 5 % comparado con el electrodo sin modificar. El ESO modificado mostró una buena respuesta electrocatalítica en la reducción de H2O2. El medio de cultivo en presencia de 1x10-3 M de H2O2 registró una disminución en la corriente por la catalasa presente en S. aureus a un potencial de -780 mV. El ESO modificado pudo detectar S. aureus en un rango de concentraciones entre 3x102 and 3x108 UFC mL-1 con un límite de detección de 102 ufc mL-1, un tiempo de detección de ~20 min y una sensibilidad de 0,020 mA UFC-1.
Citas
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Esta obra está bajo una licencia internacional Creative Commons Atribución-NoComercial-SinDerivadas 4.0.
Derechos de autor 2020 Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales