Two-rate method for simultaneous kinetic determination based on detecting the final product in successive reactions

Wu, Xinguo; Cai, Ruxiu; Zhang, Lin; Xiao, Mao

doi:10.1016/s0003-2670(01)01306-x

Cited by 7 publications

(6 citation statements)

References 11 publications

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“…[2][3][4][5][6][7][8][9][10][11][12][13][14] These mainly include high-performance liquid chromatography (HPLC) with electrochemical detection 2 or mass spectrometry, 3 flow injection analysis (FIA) techniques, 4 electrochemical detection with various modified electrodes, 5,6 capillary electrophoresis (CE), 7 chemiluminescence (CL), 8 spectrophotometry, 9,10 and fluorescence detection. [11][12][13][14] However, most of these methods usually involve careful pretreatment steps when analyzing biological matrices.…”

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confidence: 99%

“…[9][10][11][12] Some studies 13,14 have also described the application of kinetic methods based on the oxidation reaction in quantitative analysis of catecholamines or qualitative analysis of their kinetic behavior. It has been proved that spectrofluorometric methods have a capacity for providing high sensitivity, and the fluorescence spectrum information can be conveniently recorded in a single, easily available instrument.…”

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confidence: 99%

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Quantitative Analysis of Epinephrine in Human Plasma Samples Using Kinetic Fluorometric Method Combined with Second-order Calibration

Xia

Zhu

et al. 2009

ANAL. SCI.

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A kinetic fluorometric method was proposed for the quantitative determination of epinephrine (EP) in human plasma samples with the aid of second-order calibration methods based on alternating trilinear decomposition (ATLD) and alternating fitting residue (AFR) algorithms. It was based on that EP could be gradually converted to a highly fluorescent intermediate product by an oxidation reaction, and further to a non-fluorescent degradation product (o-quinone). These methodologies fully exploit the second-order advantage of the employed three-way kinetic fluorescence data, allowing the concentrations of EP to be quantified even in the presence of uncalibrated interferences. The average recoveries obtained from ATLD and AFR with a factor number of 2 (N = 2) were 100.7 ± 3.3 and 100.4 ± 2.2%, respectively. In addition, elliptical joint confidence region (EJCR) tests as well as figures of merit (FOM) were employed to evaluate the accuracy of the two algorithms.

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confidence: 99%

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confidence: 99%

Quantitative Analysis of Epinephrine in Human Plasma Samples Using Kinetic Fluorometric Method Combined with Second-order Calibration

Xia

Zhu

et al. 2009

ANAL. SCI.

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“…In order to verify the assumption that Asc in the mixture is oxidized in the course of two successive reactions, the absorbance kinetics was fitted to the kinetic equation of successive reactions [28]: …”

Section: Resultsmentioning

confidence: 99%

“…Wu et al [27,28] modified and successfully used this method for the simultaneous kinetic determination of epinephrine and norepinephrine in successive reactions. In this case, the reaction rate of one analyzed compound is determined by two rate constants (k 1 and k 2 ), which leads to a significant difference between the reaction rates of the two compounds that is essential for methods based on the simultaneous kinetic analysis.…”

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confidence: 99%

Application and comparison of two-rate and differential kinetic methods in simultaneous spectrophotometric determination of ascorbic acid and L-cysteine in pharmaceutical samples

Ghasemi

Nayebi

2006

Pharm Chem J

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Two methods for the simultaneous determination of ascorbic acid (Asc) and L-cysteine (Cys) from kinetic spectrophotometric data are described and compared. The first is the two-rate method (TRM), and the second, the differential kinetic method (DKM). Present in an excess amount, iron(III) is quantitatively reduced by Asc or Cys to iron(II) that, in turn, interacts with phenanthroline (Phen) to form a colored product, representing a Fe(II) -Phen complex that possesses a maximum absorbance at l max = 510 nm. The first method is based on the measurement of reaction rates at two points in the course of successive reactions, and the second method is based on the difference in kinetics of the Asc and Cys oxidation reactions at different pH values. Both oxidation reactions have been studied by fitting the kinetic curves (absorbance versus time) to suitable reaction rate equations. It is established that the Cys + Fe(III) reaction obeys simple first-order kinetics, while the Asc + Fe(III) is a successive two-step process. Under the conditions studied, both Asc and Cys are determined in the 0.5 -5.0 ppm range with satisfactory accuracy. The two methods under consideration have been successfully used for the analysis of model and real samples. The RMSEP values for the determination of Cys and Asc by the two kinetic methods (TRM, DKM) are 0.121, 0.120 and 0.131, 0.303 and the corresponding REP values are 5.15, 5.12% and 5.18, 11.98%, respectively. 44 0091-150X/06/4001-0044

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“…The performance of the method is evaluated by successive reactions of epinephrine and norepinephrine with potassium hexacyanoferrate(III) [K 3 Fe(CN) 6 ] for the determination of binary mixtures of the two catecholamines. Mixtures of the two catecholamines (>2 × 10 -5 mol l -1 each) with different ratios are resolved within a relative error of <5%, while other data processing methods fail to give reliable results [123].…”

Section: Other Methodsmentioning

confidence: 99%

Recent applications of kinetic methods in multi-component analysis

Bahram

Afkhami

2008

JICS

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This review on multi-component kinetic-based determinations covers most publications in this field during the period 2000-2007. The methodologies applied during recent years have been based on differential reaction rates for simultaneous multicomponent analysis. The literature shows a great attempt to apply chemometric methods, such as partial least squares regression, artificial neural networks, H-point standard addition and a new method involving mean centering of ratio spectra in this field. This review also describes some applications of advanced multiway analysis such as PARAFAC and NPLS from 2000 in the multicomponent kinetic analysis.

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Two-rate method for simultaneous kinetic determination based on detecting the final product in successive reactions

Cited by 7 publications

References 11 publications

Quantitative Analysis of Epinephrine in Human Plasma Samples Using Kinetic Fluorometric Method Combined with Second-order Calibration

Quantitative Analysis of Epinephrine in Human Plasma Samples Using Kinetic Fluorometric Method Combined with Second-order Calibration

Application and comparison of two-rate and differential kinetic methods in simultaneous spectrophotometric determination of ascorbic acid and L-cysteine in pharmaceutical samples

Recent applications of kinetic methods in multi-component analysis

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