RESUMEN
A novel structurally simple calix[4]arene appended 8-amidoquinoline linked conjugate was synthesized and has been used as a turn-on fluorescence probe for Zn(2+) and turn off fluorescence probe for F(-). Moreover, this probe has been applied for Zn(2+) detection in blood serum upto 8.7 µM and fluoride detection upto 22 nM in waste water samples, using emission spectra.
Asunto(s)
Calixarenos , Cationes Bivalentes/sangre , Fluoruros/análisis , Aguas Residuales/química , Zinc/sangre , Colorantes Fluorescentes/química , Quinolinas/química , Espectrometría de Fluorescencia , Contaminantes Químicos del Agua/análisisRESUMEN
In this communication we report a p-sulfonatocalix[4]arene coated ZnS quantum dots "cup type" highly stable optical probe for the detection and determination of menadione (VK(3)) with high sensitivity and selectivity. The detection of VK(3) depends on supramolecular host-guest chemistry.
Asunto(s)
Calixarenos/química , Fenoles/química , Puntos Cuánticos , Espectrometría de Fluorescencia , Sulfuros/química , Vitamina K 3/análisis , Compuestos de Zinc/química , Concentración OsmolarRESUMEN
A simple, rapid, cost effective and extractive UV spectrophotometric method was developed for the determination of Gemcitabine HCl (GMCT) in bulk drug and pharmaceutical formulation. It was based on UV spectrophotometric measurements in which the drug reacts with gold nanoparticles (AuNP) and changes the original colour of AuNP and forms a dark blue coloured solution which exhibits absorption maximum at 688nm. The apparent molar absorptivity and Sandell's sensitivity coefficient were found to be 3.95×10(-5)lmol(-1)cm(-1) and 0.060µgcm(-2) respectively. Beer's law was obeyed in the concentration range of 2.0-40µgml(-1). This method was tested and validated for various parameters according to ICH guidelines. The proposed method was successfully applied for the determination of GMCT in pharmaceutical formulation (parental formulation). The results demonstrated that the procedure is accurate, precise and reproducible (relative standard deviation <2%). As it is simple, cheap and less time consuming, it can be suitably applied for the estimation of GMCT in dosage forms.