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1.
Analyst ; 140(15): 5105-11, 2015 Aug 07.
Article in English | MEDLINE | ID: mdl-26034786

ABSTRACT

The ability to detect small molecules in a rapid and sensitive manner is of great importance in the field of clinical chemistry, and the advancement of novel biosensors is key to realising point-of-care analysis for essential targets. Testosterone is an example of such a small molecule, the detection of which is important in both clinical analysis, and in the sporting industry to prevent doping. As such, a portable, rapid and sensitive test for testosterone would be of great use across a variety of analytical fields. Here we report on a novel method of testosterone analysis, based on a competitive inhibition assay utilising functionalized gold nanoparticles. Two sensing platforms are directly compared for the detection of testosterone based on both classical SPR and LSPR. We provide an in-depth discussion on the optimum surface chemistries needed to create a stable detection conjugate before successfully detecting testosterone using our newly developed portable 4-channel SPR instrument. We provide the first detailed study into the comparison of SPR and LSPR for the analysis of a small molecule, and provide a simple and effective method of testosterone detection that could potentially be extended to a variety of different analytes.


Subject(s)
Gold/chemistry , Metal Nanoparticles/chemistry , Surface Plasmon Resonance/instrumentation , Testosterone/analysis , Equipment Design , Humans , Models, Molecular , Surface Plasmon Resonance/economics
2.
Acta pediatr. esp ; 58(4): 247-251, abr. 2000. tab
Article in Es | IBECS | ID: ibc-9721

ABSTRACT

La recomendación pediátrica de hervir el agua potable de consumo público para la preparación de los biberones aumenta la concentración de sus componentes químicos, lo que puede plantear problemas nutricionales en algunos casos. Material y métodos Se ha analizado el contenido en cloruros, sodio y potasio de 10 muestras de agua potable recogidas en distintos municipios de la Comunidad Valenciana (España) en febrero de 1998. Tras hervir el agua durarle 1, 5 y 10 minutos se ha determinado de nuevo la concentración en cloruros, sodio y potasio. Con estos datos, se ha calculado el aporte iónico global resultante de la fórmula de inicio reconstituida con agua hervida. Resultados. La ebullición del agua durante 10 minutos en zonas con intrusión marina, como algunas poblaciones de la Comunidad Valenciana, impide una reconstitución adecuada de la fórmula de inicio si se siguen las recomendaciones de la ESPGAN. Para la reconstitución de los biberones con fórmula de inicio se aconseja la ebullición del agua polable durante un minuto a nivel del mar o el empleo de agua mineral natural hipomineralizada (AU)


Subject(s)
Female , Infant , Male , Humans , Infant, Newborn , Bottle Feeding/methods , Chlorides/analysis , Sodium/analysis , Potassium/analysis , Water Chemical Characteristics , Drinking Water , Food, Formulated/analysis , Spain , Infant Care/methods
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