Oxidation of threonine by the analytical reagent diperiodatocuprate(III) – An autocatalysed reaction

Jose, Timy P.; Tuwar, Suresh M.

doi:10.1016/j.molstruc.2006.05.015

Cited by 44 publications

(23 citation statements)

References 17 publications

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“…As shown in Fig. 4, it can be seen that DPC (0.25 mmol L -1 ) in a potassium hydroxide solution (5.0 mmol L -1 ) has two distinct absorption peaks at about 263 and 415 nm, as reported previously (curve a); 43,44 when aqueous sulfuric acid (50 mmol L -1 ) was added in DPC solution, the absorption peaks of DPC disappeared (curve b), and when TBZ (10000 μg L -1 ) was added to DPC and aqueous sulfuric acid mixture, a single absorption peak at about 301.4 nm (curve c) re-appeared.…”

Section: Possible CL Reaction Mechanismsupporting

confidence: 79%

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Flow-Injection Determination of Thiabendazole Fungicide in Water Samples Using a Diperiodatocuprate(III)-Sulfuric Acid-Chemiluminescence System

et al. 2016

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A limited number of FI-CL methods have been reported based on the use of the Cu(III) complex in aqueous phosphoric acid and sulfuric acid solutions for the determination of ofloxacin, levofloxacin and enrofloxacin in pharmaceutical preparations, urine and veterinary preparations with detection limits (S/N = 3) 2016 © The Japan Society for Analytical Chemistry † To whom correspondence should be addressed. E-mail: yaqoob2001@hotmail.com Chemiluminescence (CL) with a flow-injection method is reported for the determination of thiabendazole (TBZ) fungicide based on its enhancement effect on diperiodatocuprate(III) (DPC)-sulfuric acid-CL system. The calibration graph was linear in the concentration range of 1 -2000 μg L -1 (R 2 = 0.9999, n = 8) with a limit of detection (S/N = 3) of 0.3 μg L -1 . The injection throughput was 160 h -1 with relative standard deviations (RSD, n = 4) of 1.1 -2.9% in the concentration range studied. The experimental variables e.g., reagents concentrations, flow rates, sample volume, and PMT voltage were optimized, and the potential interferences were investigated individually. The method was successfully applied to the determination of TBZ in water samples showing good agreement and recovery in the range of 92 ± 2.2 -108 ± 3% (n = 3) using dispersive liquid-liquid micro-extraction (DLLME). The possible CL reaction mechanism for DPC-sulfuric acid-TBZ is also discussed.Keywords Flow injection analysis, DPC, chemiluminescence, thiabendazole, water samples

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Section: Possible CL Reaction Mechanismsupporting

confidence: 79%

“…43,44 Copper(II) sulfate·5H2O (1.56 g), sodium metaperiodate (2.67 g), potassium persulfate (1 g) and potassium hydroxide (8 g) were added in 100 mL UHP water. The mixture was heated to boiling for about 20 min on a hot plate with constant stirring.…”

Section: Reagents and Solutionsmentioning

confidence: 99%

Flow-Injection Determination of Thiabendazole Fungicide in Water Samples Using a Diperiodatocuprate(III)-Sulfuric Acid-Chemiluminescence System

et al. 2016

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“…The luminol solution was stable for at least 1 month when stored in dark. The DPC stock solution (0.01 mol/L) was prepared by oxidizing Cu(II) in the alkaline medium according to the known method (42). In briefly, KIO 4 (0.23 g), CuSO 4 ·5H 2 O (0.125 g), Na 2 S 2 O 8 (0.14 g), KOH (0.8 g) were added to 30 mL water.…”

Section: Experimental Reagents and Chemicalsmentioning

confidence: 99%

Determination of free cholesterol based on a novel flow‐injection chemiluminescence method by immobilizing enzyme

Zhang

2008

Luminescence

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A novel flow injection chemiluminescence method is proposed for determination of cholesterol in this paper. The cholesterol oxidase was immobilized onto sol-gel and prepared as an enzymatic reaction column. The determination of cholesterol was performed by quantitative determination of hydrogen peroxide produced from an enzymatic reaction. The luminol-H2O2-metal chelate diperiodatocuprate(III) system ensured that the method was highly sensitive and selective. Free cholesterol was determined over the range 5.0 x 10(-8) mol/L-5.0 x 10(-7) mol/L, with a limit of detection (3sigma) of 1.9 x 10(-8) mol/L. The relative standard deviation (RSD) for 2.5 x 10(-7) mol/L was 2.7% (n = 7). The proposed method offered the advantages of sensitivity, selectivity, simplicity and rapidity for free cholesterol determination, and was successfully applied to the direct determination of free cholesterol in serum.

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“…The 0.01 mol L -1 DPC stock solution was prepared by oxidizing Cu(II) in an alkaline medium according the known method. 25 In brief, KIO4 (0.23 g), CuSO4·5H2O (0.125 g), Na2S2O8 (0.14 g) and KOH (0.8 g) were added in 30 mL of water. The mixture was heated to boiling for about 20 min on a hot plate with constant stirring.…”

Section: Reagents and Chemicalmentioning

confidence: 99%

A Sensitive Chemiluminescence Method for the Determination of H2O2 in Exhaled Breath Condensate

Zhang

Yang

2008

ANAL. SCI.

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In this paper, a novel flow injection chemiluminescence (FI-CL) method is proposed for the determination of picomolar L -1 levels of hydrogen peroxide (H2O2) in exhaled breath condensate (EBC). This method is based on the oxidation of a low concentration of luminol (10 -7 M) by H2O2 at a low concentration level (< 10 -8 M) in an alkaline medium catalyzed by a complex, K5[Cu(HIO6)2] (DPC), which is not interfered by other metal ions or horseradish peroxidase (HRP). Under the optimum conditions, H2O2 was determined over the range of 1.0 × 10 -10 to 1.0 × 10 -8 mol L -1 with a detection limit of (3σ) of 4.1 × 10 -11 mol L -1 . The relative standard deviation (RSD) was 3.2% for 5 nmol L -1 H2O2 (n = 7). The proposed method offers the advantages of ultra-sensitivity, selectivity, simplicity and rapidity for H2O2 determination. It was successfully applied to directly determine trace amounts of H2O2 (nmol L -1 ) in human's EBC of both rheum and healthy volunteers. A statistically significant difference was found between patients with rheum (n = 11) and control subjects without rheum (n = 11).

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Oxidation of threonine by the analytical reagent diperiodatocuprate(III) – An autocatalysed reaction

Cited by 44 publications

References 17 publications

Flow-Injection Determination of Thiabendazole Fungicide in Water Samples Using a Diperiodatocuprate(III)-Sulfuric Acid-Chemiluminescence System

Flow-Injection Determination of Thiabendazole Fungicide in Water Samples Using a Diperiodatocuprate(III)-Sulfuric Acid-Chemiluminescence System

Determination of free cholesterol based on a novel flow‐injection chemiluminescence method by immobilizing enzyme

A Sensitive Chemiluminescence Method for the Determination of H2O2 in Exhaled Breath Condensate

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