Can clay emit light? Ru(bpy)32+-modified clay colloids and their application in the detection of glucose

Liang, Ping Yi; Chang, Pei Wen; Wang, Chong Mou

doi:10.1016/j.jelechem.2003.07.010

Cited by 16 publications

(14 citation statements)

References 56 publications

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“…The results indicate that the deprotonation of both the carboxylic group and amine nitrogen facilitated the present ECL emission. Being consistent with the previous opinion that carboxylic groups decreased the ECL emission [16][17][18][19][20][21][22][23][24][25] , the above phenomena can be explained as follows: Under alkaline conditions, carboxylic groups are deprotonated to form carboxylate ions, which have abundant electrons and become electron-donating. Because the electron-donating group can stabilize the formed radical and improve ECL efficiency, the alkaline condition gives a high ECL efficiency due to the deprotonation of the carboxylic group.…”

Section: +supporting

confidence: 89%

“…The electron-withdrawing/donating property of the R group, e.g., carboxylic group in this work, attached to the α-carbon of the amine also influenced the ECL emission through affecting the stability of the formed radical via hyperconjugation and electron-donating effects [16][17][18][19][20][21][22][23][24][25] . Generally, the carboxylic group was considered to decrease the ECL efficiency of its host molecules because of its electron-withdrawing character at nearly neutral pH [10,[23][24][25] .…”

Section: +mentioning

confidence: 82%

“…However, only a few studies [16 -23] related to the ECL of aminocarboxylic acid/Ru(bpy) 3 2+ systems have been reported. In these studies, the carboxylic group was typically considered as an electron-withdrawing group, which reduced the ECL efficiency of the co-reactants [16][17][18][19][20][21] . Cao et al [16] reported a low potential ECL of Ru(bpy) 3 2+ and investigated the corresponding emission in the presence of EDTA, some alkylamines and organic acids with the help of reactive oxygen species.…”

Section: Introductionmentioning

confidence: 99%

“…Xu and Dong [17] investigated the effects of metal ions on Ru(bpy) 3 2+ ECL with EDTA as the co-reactant. EDTA was considered to be an effective promoter for Ru(bpy) 3 2+ -oxalate ECL [18] . EDTA was also found to interfere with the determination of pyruvate via Ru(bpy) 3 2+ ECL in the presence of cerium (Ⅲ) [19] .…”

Section: Introductionmentioning

confidence: 99%

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Electrochemiluminescence from tris(2,2′-bipyridyl) ruthenium (II) in the presence of aminocarboxylic acid co-reactants

Yin

Sha

2009

Sci. China Ser. B-Chem.

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Due to the highly sensitive electrochemiluminescence (ECL), tris(2,2′-bipyridyl) ruthenium(II) (Ru(bpy) 3 2+ )is often used in the field of bioarrays with the help of co-reactants. However, the generally used co-reactant, tripropylamine (TPA), is toxic, corrosive and volatile. Therefore, the search for safe, sensitive and economical co-reactants is critical. Herein, three aminocarboxylic acids, ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), and 2-hydroxyethylethylene diaminetriacetic acid (HEDTA), have been investigated as potential co-reactants for promoting Ru(bpy) 3 2+ ECL behaviour. A possible ECL mechanism is also presented. The experimental results suggested that the co-reactants have a different ECL behaviour compared to TPA, such as different pH-and surfactant-responses. The detection limits of Ru(bpy) 3 2+ using NTA, EDTA and HEDTA as co-reactants are 1, 60 and 680 fmol·L  1 , respectively. The results indicate that NTA has a much higher efficiency than TPA to excite Ru(bpy) 3 2+ ECL under their own optimal conditions. NTA could be widely used in many fields because it is less toxic, corrosive and volatile than TPA. Moreover, using Ru(bpy) 3 2+ ECL, a sensitive method for the detection of aminocarboxylic acids is also developed. An improvement of four orders of magnitude in detection limits is obtained for EDTA compared to the known Ru(bpy) 3 2+ chemiluminescent methods.Ru(bpy) 3 2+, electrochemiluminescence, co-reactants, aminocarboxylic acids

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Section: +supporting

confidence: 89%

Section: +mentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemiluminescence from tris(2,2′-bipyridyl) ruthenium (II) in the presence of aminocarboxylic acid co-reactants

Yin

Sha

2009

Sci. China Ser. B-Chem.

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“…Developing CMEs for biomolecular sensing has also been a stimulating topic in recent years [15][16][17][18][19][20] . It is particularly interesting to develop new types of electrodes for electrocatalytically sensing DNA [32] .…”

Section: Introductionmentioning

confidence: 99%

Photoelectrocatalytic oxidation of GMP on an ITO electrode modified with clay/[Ru(phen)2(dC18bpy)]2+ hybrid film

Chang

Wang

Lin

et al. 2009

Sci. China Ser. B-Chem.

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An indium tin oxide (ITO) electrode modified with monolayer clay/[Ru(phen) 2 (dC18bpy)] 2+ (phen= 1,10-phenanthroline, dC18bpy = 4,4′-dioctadecyl-2,2′ bipyridyl) hybrid film has been fabricated by the Langmuir-Blodgett (LB) method. Atomic force microscopy revealed that the single-layered hybrid film of clay/[Ru(phen) 2 (dC18bpy)] 2+ (denoted as Clay-Ru) was closely packed at a surface pressure of 25 mN⋅m −1 and had a thickness of 3.4±0.5 nm. Cyclic voltammograms showed that the redox current of Ru(Ⅱ) complex decreased when incorporated into the clay film, suggesting that the clay layer acts as a barrier against electron transfer. When applied to oxidizing the mononucleotide of guanosine 5′-monophosphate (GMP), a large catalytic oxidative current was achieved on the Clay-Ru(Ⅱ) modified ITO electrode at the external potential above 900 mV (vs. Ag|AgCl|KCl ) and, more significantly, this response was further enhanced by light irradiation (λ>360 nm), in which the photocurrent is increased about 11 times in comparison with that of a bare ITO. Mechanism of the photoelectrocatalytic effect was proposed in terms of the reduction of the photoelectrochemically generated Ru(Ⅲ) complex in the Clay-Ru film by GMP.clay-modified electrodes, Langmuir-Blodgett method, hybrid film, photocurrent

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Biosensing applications of clay-modified electrodes: a review

Mousty

2009

Anal Bioanal Chem

143

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Two-dimensional layered inorganic solids, such as cationic clays and layered double hydroxides (LDHs), also defined as anionic clays, have open structures which are favourable for interactions with enzymes and which intercalate redox mediators. This review aims to show the interest in clays and LDHs as suitable host matrices likely to immobilize enzymes onto electrode surfaces for biosensing applications. It is meant to provide an overview of the various types of electrochemical biosensors that have been developed with these 2D layered materials, along with significant advances over the last several years. The different biosensor configurations and their specific transduction procedures are discussed.

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Can clay emit light? Ru(bpy)32+-modified clay colloids and their application in the detection of glucose

Cited by 16 publications

References 56 publications

Electrochemiluminescence from tris(2,2′-bipyridyl) ruthenium (II) in the presence of aminocarboxylic acid co-reactants

Electrochemiluminescence from tris(2,2′-bipyridyl) ruthenium (II) in the presence of aminocarboxylic acid co-reactants

Photoelectrocatalytic oxidation of GMP on an ITO electrode modified with clay/[Ru(phen)2(dC18bpy)]2+ hybrid film

Biosensing applications of clay-modified electrodes: a review

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