Reversed Micellar-Mediated Luminol Chemiluminescence Reaction with Bis(acetylacetonato)oxovanadium(IV)

TheingiKyaw,; Kumooka, Satomi; Okamoto, Yasuaki; Fujiwara, Terufumi; Kumamaru, Takahiro

doi:10.2116/analsci.15.293

Cited by 22 publications

(3 citation statements)

References 17 publications

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“…The reverse micelle is a droplet of water, surrounded by surfactant polar heads, while the surfactant hydrophobic chains extend into the bulk organic phase. It has been pointed out that the micellar microreactor has the capability to facilitate the quantitative transfer of species of experimental interest into the water pool and their subsequent conversion into CL active species at the surfactant−water interface. ,− Previously, it was observed that CL results upon mixing iodine with the reversed micellar solution of luminol . Further, the reversed micellar-mediated CL (RMM-CL) generation from the iodine−luminol reaction allowed us to develop a new method for determination of iodide or iodine in aqueous samples based on coupling of solvent extraction with the RMM-CL detection, and problems associated with aqueous-phase CL detections were either eliminated or greatly reduced: Using a flow system, iodine was transferred from the aqueous solution into the organic solvent, onward membrane-separated, and then the postextraction step was directly coupled to the RMM-CL detection.…”

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Photocatalytic Dehalogenation Coupled On-Line to a Reversed Micellar-Mediated Chemiluminescence Detection System: Application to the Determination of Iodinated Aromatic Compounds

et al. 2003

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The effects of illumination time, temperature, catalyst concentration, and pH on the on-line photocatalytic dehalogenation of iodinated aromatic compounds in a near-UV-illuminated titanium dioxide (anatase type) aqueous suspension were monitored via the iodine-luminol chemiluminescence (CL) reaction in a reversed micellar medium, and a new, automated, rapid, and efficient method was developed. A water-cooled, 400-W high-pressure Hg lamp was used as an internal light source. The flow procedure involved the following: (1) photocatalytic dehalogenation/degradation of the iodinated compound by the near-UV-illuminated titanium dioxide and the production of iodide species, (2) oxidation of iodide into iodine, (3) extraction of iodine into cyclohexane, (4) membrane separation of the iodine-containing organic phase from the aqueous phase, and (5) the detection of iodine using the luminol CL reaction in the reversed micellar solution of cetyltrimethylammonium chloride in 6:5 (v/v) chloroform-cyclohexane/water buffered with sodium carbonate. Results for the dehalogenation of the iodinated compounds, o-iodobenzoic acid and L-thyroxine (3,5,3',5'-tetraiodothyronine) sodium, were compared with a standard inorganic iodide solution. After establishing the optimum chemical and instrumental conditions, detection limits of 0.8 x 10(-9) and 0.2 x 10(-9) M and linear calibration graphs were obtained with dynamic ranges from 0.79 x 10(-7) to 7.9 x 10(-7) M and from 0.20 x 10(-7) to 2.0 x 10(-7) M for o-iodobenzoic acid and L-thyroxine, respectively. A precision of approximately 4% relative standard deviation (n = 6) was provided at an o-iodobenzoic acid concentration of 0.79 x 10(-7) M. The method developed was applied to the on-line determinations of iodinated aromatic compounds such as L-thyroxine sodium and iopamidol ((S)-N,N'-bis[2-hydroxy-1-(hydroxymethyl)ethyl]-5-[(2-hydroxy-1-oxopropyl)amino]-2,4,6-triiodoisophthaldiamide) in pharmaceuticals.

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Photocatalytic Dehalogenation Coupled On-Line to a Reversed Micellar-Mediated Chemiluminescence Detection System: Application to the Determination of Iodinated Aromatic Compounds

et al. 2003

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“…The significance of reverse micelles in CL analysis is considered to be due to their unique structure (size/shape) and composition. Although not proven, it is believed that reversed micellar mediated CL (RMM-CL) reactions occur at surfactant−water interfaces. ,, With the additional advantage of sensitivity, these microreactors have the capability to transfer species of experimental interest quantitatively into the water pool. ,, …”

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“…Because of the catalytic behavior of different metal ions and the effectiveness of reverse micelles in CL reactions, we used RMM-CL reactions to develop new methods for the off/on-line trace-level quantification of gold(III), − , rhodium(III), iron(III), , iron(II), and vanadium(IV). , Most probably via an ion-pair formation in the extraction process, gold(III) was transferred as the tetrachloroaurate ion from aqueous solution into chloroform containing tri- n -octylphosphine oxide . The postextraction step was directly coupled to an RMM-CL detection system, and the resulting solvent extraction/RMM-CL hybrid method was then applied to the determination of gold in industrial samples. , …”

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Solvent Extraction Coupled On-Line to a Reversed Micellar Mediated Chemiluminescence Detection System for Trace-Level Determination of Atropine

et al. 2000

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A fast and sensitive method for the determination of atropine, an alkaloid closely related to cocaine, is proposed. The principles of on-line ion-pair formation of alkaloid-metal complexes and liquid-liquid extraction are applied to the chemiluminescence determination of atropine. On mixing with a reversed micellar medium of cetyltrimethylammonium chloride in dichloromethane-cyclohexane (1:1 v/v)-water (0.3 M Na2CO3) containing luminol, the ion-pair complex of tetrachloroaurate(III) with atropinium produced an analytical chemiluminescence signal when it entered the reversed micellar water pool. Using the reverse-flow injection and chemical conditions optimized for atropine in aqueous samples, a detection limit of 1 ng/mL was achieved and a linear calibration graph was obtained with a wide dynamic range from 10 ng/mL to 100 micrograms/mL. The proposed method is simple and provides a good precision with a relative standard deviation (n = 6) of ca. 3% at the atropine concentration of 100 ng/mL. After a preliminary study involving the potential interference from species of organic, inorganic, and metallic nature, the method was applied to the determination of atropine in artificial urine samples and of atropine and scopolamine in pharmaceutical formulations.

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Analytical Aspects of Metal Enolates

Harlev

Bittner

Zabicky

2010

Patai's Chemistry of Functional Groups

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Reversed Micellar-Mediated Luminol Chemiluminescence Reaction with Bis(acetylacetonato)oxovanadium(IV)

Cited by 22 publications

References 17 publications

Photocatalytic Dehalogenation Coupled On-Line to a Reversed Micellar-Mediated Chemiluminescence Detection System: Application to the Determination of Iodinated Aromatic Compounds

Photocatalytic Dehalogenation Coupled On-Line to a Reversed Micellar-Mediated Chemiluminescence Detection System: Application to the Determination of Iodinated Aromatic Compounds

Solvent Extraction Coupled On-Line to a Reversed Micellar Mediated Chemiluminescence Detection System for Trace-Level Determination of Atropine

Analytical Aspects of Metal Enolates

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