Spectrophotometric determination of catecholamine using vanadium and eriochrome cyanine r

Nagaraja, Padmarajaiah; Shrestha, Ashwinee Kumar; Shivakumar, Anantharaman; Al-Tayar, Naef Ghallab Saeed; Gowda, Avinask K.

doi:10.1590/s0100-40422011000300002

Cited by 8 publications

(8 citation statements)

References 10 publications

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“…In recent years, there have been many techniques described for detecting NO 2 − , including spectrophotometry, sequential injection spectrophotometrics, optical probes, electrochemical analysis, and so on . Each detection method has its own unique advantages and has been widely used.…”

Section: Introductionmentioning

confidence: 99%

A colorimetric fluorescent probe for rapid and specific detection of nitrite

Shi

Yang

et al. 2019

Luminescence

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The method of fluorescent probes has been an important technique for detection of nitrite (NO2−). As an important inorganic salt, excessive nitrite would threaten humans and the environment. In this paper, a colorimetric fluorescent probe P‐N (1,2‐diaminoanthraquinone) with rapid response and high selectivity, which could detect NO2− by visual colour changes and fluorescence spectroscopy is presented. The probe P‐N solution (pH 1) changed from pink to colourless with the addition of NO2− and fluorescence intensity at 639 nm clearly decreased. Good linear exists between fluorescence intensities and NO2− concentrations for the range 0–16 μM, and the detection limit was 54 nM (based on a 3σ/slope). Moreover, probe P‐N could also detect NO2− in real water samples, and results were all satisfactory. Probe P‐N shows great practical application value for detecting NO2− in the environment.

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Section: Introductionmentioning

confidence: 99%

A colorimetric fluorescent probe for rapid and specific detection of nitrite

Shi

Yang

et al. 2019

Luminescence

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“…It has the advantages of a good separating effect and high speed, but needs complex sample pre‐treatment processes, and therefore is not suitable for analysing large amounts of samples. Spectrophotometry is another method in the National Standard for analysing nitrite, it is simple and suitable for batch sample analysis, but the method sensitivity needs improvement and the chromogenic reagent commonly used has a some toxicity. Chemiluminescence (CL) based on the microfluidic chip is also an effective way for the sensing nitrite, but this option is reagent‐ and time‐consuming when needed for large quantities of data.…”

Section: Introductionmentioning

confidence: 99%

The determination of nitrite by a graphene quantum dot fluorescence quenching method without sample pretreatment

et al. 2017

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A method for quantitative analysis of nitrite was achieved based on fluorescence quenching of graphene quantum dots. To obtain reliable results, the effects of pH, temperature and reaction time on this fluorescence quenching system were studied. Under optimized conditions, decrease in fluorescence intensity of graphene quantum dots (F /F) showed a good linear relationship with nitrite concentration between 0.007692-0.38406 mmol/L and 0.03623-0.13043 μmol/L; the limits of detection were 9.8 μmol/L and 5.4 nmol/L, respectively. Variable temperature experiments, UV absorption spectra and thermodynamic calculations were used to determine the quenching mechanism, and indicated that it was an exothermic, spontaneous dynamic quenching process. This method was used to analyse urine samples, and showed that it could be applied to analyse biological samples.

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“…β-blockers also improve the heart's ability to relax and exhibit calming neurological effects decreasing anxiety, nervousness and stabilizing motor performance. 3 Different methods have been employed for the analysis of methyldopa in pharmaceutical formulations including electrochemical methods, [4][5][6][7] spectrophotometry, 1,[8][9][10] kinetic methods, 11 chemiluminescence, 12 capillary electrophoresis (CE) 13 and thin layer chromatography. 14 The main methods of the determination of pioglitazone in pharmaceutical preparations are chromatography, 2,[15][16][17] spectrophotometry, 18,19 electrochemical, 20,21 and thermal methods.…”

Section: Introductionmentioning

confidence: 99%