Metal chelate fluorescence enhancement in micellar media and its applications to niobium and tantalum ultratrace determinations

Sanz‐Medel, Alfredo; Alonso, J. Ignacio García; González, Elisa Blanco

doi:10.1021/ac00285a038

Cited by 62 publications

(17 citation statements)

References 24 publications

(21 reference statements)

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“…Al 3+ ions. 120 A comprehensive and excellent review on avonoids as analytical reagents has been published recently. 121 Therefore only some selected examples for spectrophotometric and spec-trouorimetric applications are presented here to give the reader an insight into the potential of avonoid complexes in analytical chemistry.…”

Section: Applications In Chemical Analysismentioning

confidence: 99%

Properties and applications of flavonoid metal complexes

2015

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Section: Applications In Chemical Analysismentioning

confidence: 99%

Properties and applications of flavonoid metal complexes

2015

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“…25 The possible electrostatic and hydrophobic interactions occurred concurrently at the micellar level between the anionic complex with the reagent containing negative sulfonic groups and the positive quaternary ammonium group of the surfactant produces a maximum enhancement of the fluorescence due to achievement of a more rigid structure. 26 In further experiments, an HTAB concentration of 0.5%, has been used.…”

Section: Optimum Experimental Conditionsmentioning

confidence: 99%

Sensitive Spectrofluorometric Determination of Vanadium with Sodium 1,2-Dihydroxyanthraquinone-3-sulfonate in Cationic Micellar Medium

Garcı́a-Campaña

Barrero²,

Ceba

1996

ANAL. SCI.

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A spectrofluorometric method is described for the determination of vanadium(V) based on its complexation reaction with sodium 1,2-dihydroxyanthraquinone-3-sulfonate in presence of hexadecyltrimethylammonium bromide. The fluorescence is monitored at 607 nm with excitation at 505 nm. The experimental variables and interferences in this determination have been studied. The detection limit is 3.0 ng ml-' and the linear range is between 10 and 1000 ng ml-'. The method has been applied to the determination of vanadium in clams and seawater with satisfactory precision.Keywords Spectrofluorometry, vanadium determination, sodium 1,2-dihydroxyanthraquinone-3-sulfonate, micellar mediumVanadium is an essential trace element to man and animals, possessing specific physiological functions.1 Generally, concentrations determined in land plants and animals are less than those found in marine forms.2 However, numerous reports have warned of the toxic effects of vanadium resulting from excessive industrial exposure and from emissions into the environment from refineries, iron, steel and chemical industries as a result of the combustion of petroleum derivatives, which contain vanadium in the form of porphyrin complex.3 The toxicity of vanadium compounds increases with valence, the pentoxide being the most toxic.In the literature a few methods for the fluorometric determination of vanadium(V) are described. The oxidation reactions of anthraquinone derivatives have been used for the determination of vanadium(V). The anthraquinones used were 1,4-diamino-5-nitroanthraquinone4, 1-amino-4-hydroxyanthraquinone5'6, sodium 4,8-diamino-l,5-dihydroxyanthraquinone-2,6-disulfonate7-9 and sodium 1,3-dihydroxy-4-aminoanthraquinone-2-sulfonate.10 In all cases, the oxidation products are formed under certain conditions: as strongly acidic media and high temperatures (80 -85° C).The sodium salt of 1,2-dihydroxyanthraquinone-3-sulfonic acid (Alizarin Red S, ARS) has been widely used as a photometric reagentll, but it only has been used for the fluorometric determination of boron12,13, aluminum and gallium14, niobium15 and molybdenum.13,16 Of these, t To whom correspondence should be addressed.the fluorescence intensity has been greatly enhanced for the determination of molybdenum and niobium by addition of a cationic surfactant. These micellar media can improve the fluorescence determination of metals, presenting several advantages over conventional homogeneous solution techniques including increased sensitivity, reduced interferences and enhanced experimental convenience.l7-19In the present work, a spectrofluorometric method for determination of vanadium is proposed. The fluorescence of the complex formed between Alizarin Red S and vanadium(V) is developed in the presence of a cationic surfactant and the influence of the concentration is studied.The method has been successfully applied to the determination of V in clams and seawater. Compared with other fluorometric methods, the proposed determination is quite sensitive, offers shorter analysis time...

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“…Some of these compounds have been used as nutrition supplements because of their health benefits, such as antioxidant [39], UV-B protection [40], and anticancer [41] properties. In analytical chemistry, flavonol (3-hydroxyflavone) has been extensively used to detect various metal ions in aqueous samples as its fluorescence is vastly boosted by coordinating with metal ions [42]. Recently, synthetic diethylamino substituted flavonol has been utilized as a turn-on fluorescent probe to analyze thiols [43].…”

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confidence: 99%

Synthesis of a Flavone Based Fluorescent Probe Bearing a Nitroolefin Moiety for Selective Detection of Cysteine

Saleh

Nadia

Eldin

et al. 2018

SQU Journal for Science

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In this paper, we report the synthesis, characterization and investigation of the optical properties of a new fluorescent probe, 4ʹ-nitroolefinylflavone (4ʹ-NOF) 1, based on a flavone skeleton and bearing a nitroolefin moiety. Upon the addition of cysteine, a remarkable fluorescence enhancement (200 fold) was observed for probe 1 accompanied with a slight blue shift from 457 nm to 459 nm. The prepared probe displays high selectivity and sensitivity towards cysteine over other amino acids. The Michael addition of cysteine to probe 1 was confirmed by 1H-NMR spectroscopy. The detection limit of probe 1 towards cysteine was found to be 1.63 μΜ, a lower concentration than the normal human cysteine level, 30-200 μΜ.

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Metal chelate fluorescence enhancement in micellar media and its applications to niobium and tantalum ultratrace determinations

Cited by 62 publications

References 24 publications

Properties and applications of flavonoid metal complexes

Properties and applications of flavonoid metal complexes

Sensitive Spectrofluorometric Determination of Vanadium with Sodium 1,2-Dihydroxyanthraquinone-3-sulfonate in Cationic Micellar Medium

Synthesis of a Flavone Based Fluorescent Probe Bearing a Nitroolefin Moiety for Selective Detection of Cysteine

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