Investigation of a Novel Ag(III) Chemiluminescence System and its Mechanism for Determination of Uric Acid in Human Urine
نویسندگان
چکیده
Um método simples e sensível baseado na análise de quimiluminescência por injeção em fluxo acoplado ao complexo luminol-Ag(III) foi desenvolvido para se determinar ácido úrico (UA) em urina humana. O método se baseia na reação de quimiluminescência (CL) do luminol com Ag(III) em solução alcalina, sendo que o UA da urina aumenta dramaticamente as intensidades CL. Em condições ótimas, a intensidade CL relativa aumentava linearmente com a concentração de UA, na faixa de 1.0 × 10 a 5.0 × 10 mol L com um limite de detecção de 2.0 × 10 mol L (3σ). O desvio padrão relativo (n = 11) era de 0.71% para 1.0 × 10 mol L UA. Os mecanismos de reação possíveis do sistema CL foram sugeridos com base nos espectros de absorção UV, espectros CL e no experimento de trapping de radicais livres feitos neste trabalho.
منابع مشابه
Terbium Sensitized Chemiluminescence Method for the Determination of Rabeprazole -Application to Pharmaceutical Analysis and Dissolution Studies
A simple and sensitive chemiluminescence-based method was established for the determination of rabeprazole.The proposed method was based on the enhancing effect of rabeprazole on Ce(IV)-Na2SO3 -Tb(III) chemiluminescence reaction. A possible mechanism was discussed for chemiluminescence system by studying UV-Vis, fluorescence and chemiluminescence spectra. The effects of va...
متن کاملA Sensitive Simultaneous Determination of Uric Acid, Norepinephrine and Indomethacin using a Cadmium Sulfide Nanoparticles/Multi-Walled Carbon Nanotubes Modified Gold Electrode
In this study a novel method was developed to fabricate cadmium sulfide nanoparticles/multiwalled carbon nanotubes composite modified gold electrode (CdSNPs/MWCNTS/AuE) to measure trace amounts of norepinephrine(NE), indomethacin (IND), and uric acid (UA) simultaneously. Electrochemical investigations were carried out using cyclic voltammetry (CV), differential pulse voltammetry (DPV) and chron...
متن کاملDirect Chemiluminescence Determination of Oxymorphone Using Potassium Permanganate and Polyphosphoric Acid
Abstract A simple and sensitive chemiluminescence (CL) method was developed for direct quantification of oxymorphone, a µ opioid agonist that is approximately 10 times more potent than morphine. In this method potassium permanganate in polyphosphoric acid was used as CL reagent. Using this method, oxymorphone can be determined over the concentration ranges 13.5-337.8 ng mL-1 and 0.34-6.76...
متن کاملChemiluminescence Determination of Hydroxyzine and its Metabolite Cetirizine
A chemiluminescence (CL) method has been developed for the determination of Hydroxyzine (Hyd) and its metabolite Cetirizine (Cet). The method is based on sensitizing effect of Cet and Hyd on the weak CL reaction between Ru(phen)32+ and acidic Ce(IV). A mechanism for the CL reaction has been proposed on the basis of UV-Vis, fluorescent and CL spectra. By using the recommended procedure, the cali...
متن کاملSimultaneous determination of dopamine and uric acid using a glassy carbon paste electrode modified with copper- para red complex
A simple approach based on cyclic voltammetry (CV) was developed for the simultaneous determination of dopamine (DA) and uric acid (UA) in the presence of ascorbic acid (AA) using a modified glassy carbon paste electrode (GCPE). In the present study, analytical parameters were optimized and electrochemical performance of modified electrode was investigated. The calibration curves were obtained ...
متن کامل