A colorimetric and fluorescence “turn-off” chemosensor for the detection of silver ion based on a conjugated polymer containing 2,3-di(pyridin-2-yl)quinoxaline

Cui, Wei; Wang, Lingyun; Xiang, Gang; Zhou, Lixia; An, Xiaoning; Cao, Derong

doi:10.1016/j.snb.2014.10.072

Cited by 75 publications

(32 citation statements)

References 68 publications

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“…Particularly, the fluorescence properties and sensing ability of CP‐based fluorescence chemosensors are determined by chromophore and recognition site in the polymer. The design of polymer molecule components plays a significant role in adjusting the ability of selectivity for fluorescence chemosensors, and introducing different functional recognition sites in the polymer backbone and side chains can realize effective detection for ions, small molecules, and biomacromolecules . The recognition site can realize detection with these objects by the formation of a covalent bond from chemical reactions and weak interactions involve coordination, hydrogen bond, electrostatic attraction and Van der waals' force .…”

Section: Introductionmentioning

confidence: 99%

A Novel Conjugated Polymer Consists of Benzimidazole and Benzothiadiazole: Synthesis, Photophysics Properties, and Sensing Properties for Pd²⁺

Liu

2020

Journal of Polymer Science

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A conjugated polymer PPBIBTE based on benzimidazole and benzothiadiazole was synthesized through palladium‐catalyzed sonogashira cross‐coupling reaction. The chemical structures of the monomers and the polymer were indicated by 1H NMR, and investigation of photophysics properties and sensing optical properties for metal ions were observed by ultraviolet–visible and photoluminescence spectroscopy. PPBIBTE showed remarkable selectivity for Pd2+ by “turn‐off” fluorescence sensing progress. In addition, the Stern–Volmer and Benesi‐Hildebrand plots were used to reveal the interaction between the polymer and Pd2+, while job's method was applied to calculate the determination of stoichiometry. The results demonstrate that PPBIBTE can utilize static quenching for Pd2+ by forming a 1:1 complex. And it is a potential sensing material as fluorescence chemosensor for Pd2+ with high selectivity and sensitivity. © 2020 Wiley Periodicals, Inc. J. Polym. Sci. 2020, 58, 831‐842

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Section: Introductionmentioning

confidence: 99%

A Novel Conjugated Polymer Consists of Benzimidazole and Benzothiadiazole: Synthesis, Photophysics Properties, and Sensing Properties for Pd²⁺

Liu

2020

Journal of Polymer Science

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“…Thus, Ag + biosensors 29,33,[40][41][42][43][44] , chemosensors [45][46][47] , ion-selective electrodes 48,49 , and voltammetric techniques [49][50][51] are currently being investigated. Herein, we present a simple, cost-effective, and highly-sensitive approach to heavy metal detection, focusing on silver in particular.…”

Section: Introductionmentioning

confidence: 99%

Amperometric Detection of Aqueous Silver Ions by Inhibition of Glucose Oxidase Immobilized on Nitrogen-Doped Carbon Nanotube Electrodes

2015

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An amperometric glucose biosensor based on immobilization of glucose oxidase on nitrogen-doped carbon nanotubes (N-CNTs) was successfully developed for the determination of silver ions. Upon exposure to glucose, a steady-state enzymatic turnover rate was detected through amperometric oxidation of the H2O2 byproduct, directly related to the concentration of glucose in solution. Inhibition of the steady-state enzymatic glucose oxidase reaction by heavy metals ions such as Ag(+), produced a quantitative decrease in the steady-state rate, subsequently creating an ultrasensitive metal ion biosensor through enzymatic inhibition. The Ag(+) biosensor displayed a sensitivity of 2.00 × 10(8) ± 0.06 M(-1), a limit of detection (σ = 3) of 0.19 ± 0.04 ppb, a linear range of 20-200 nM, and sample recovery at 101 ± 2%, all acquired at a low-operating potential of 0.05 V (vs Hg/Hg2SO4). Interestingly, the biosensor does not display a loss in sensitivity with continued use due to the % inhibition based detection scheme: loss of enzyme (from continued use) does not influence the % inhibition, only the overall current associated with the activity loss. The heavy metals Cu(2+) and Co(2+) were also detected using the enzyme biosensor but found to be much less inhibitory, with sensitivities of 1.45 × 10(6) ± 0.05 M(-1) and 2.69 × 10(3) ± 0.07 M(-1), respectively. The mode of GOx inhibition was examined for both Ag(+) and Cu(2+) using Dixon and Cornish-Bowden plots, where a strong correlation was observed between the inhibition constants and the biosensor sensitivity.

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“…[16][17][18] Fluorescence provides high sensitivity among the many available signal types. [16][17][18] Fluorescence provides high sensitivity among the many available signal types.…”

Section: Introductionmentioning

confidence: 99%

Determination of trace amounts of iron by a simple fluorescence quenching method

2015

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A simple and sensitive spectrofluorimetric method based on the reaction of iron and tiron in acidic medium is developed for the determination of Fe(III), which gives an intense fluorescence quenching that was measured at 345 nm (excitation at 292 nm). The fluorescence quenching extent is proportional to the iron concentration in the range of 34.0-840 ng mL À1 . A detection limit of 9.4 ng mL À1 and a relative standard deviation (for 11 replicate measurements) of AE0.84% were obtained. Moreover, the factors affecting product fluorescence intensity, such as the pH, tiron concentration, reaction time and temperature, were investigated and optimized. This simple and sensitive method was successfully applied for the determination of trace amounts of iron in human hair, ferrous tablet, certified reference material and synthetic sample. Experimental Reagents and standardsA stock solution of iron (1000 mg mL À1 ) was prepared by dissolving an appropriate amount of FeNH 4 (SO 4 ) 2 $12H 2 O (Merck, Fig. 1 Fe-tiron complex structure in pH ¼ 5.5. View Article Onlinea Limit of detection. b Fluorescence quenching. c Spectrophotometry. d Certied reference material. e X-ray uorescence.This journal is

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A colorimetric and fluorescence “turn-off” chemosensor for the detection of silver ion based on a conjugated polymer containing 2,3-di(pyridin-2-yl)quinoxaline

Cited by 75 publications

References 68 publications

A Novel Conjugated Polymer Consists of Benzimidazole and Benzothiadiazole: Synthesis, Photophysics Properties, and Sensing Properties for Pd²⁺

A Novel Conjugated Polymer Consists of Benzimidazole and Benzothiadiazole: Synthesis, Photophysics Properties, and Sensing Properties for Pd²⁺

Amperometric Detection of Aqueous Silver Ions by Inhibition of Glucose Oxidase Immobilized on Nitrogen-Doped Carbon Nanotube Electrodes

Determination of trace amounts of iron by a simple fluorescence quenching method

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A colorimetric and fluorescence “turn-off” chemosensor for the detection of silver ion based on a conjugated polymer containing 2,3-di(pyridin-2-yl)quinoxaline

Cited by 75 publications

References 68 publications

A Novel Conjugated Polymer Consists of Benzimidazole and Benzothiadiazole: Synthesis, Photophysics Properties, and Sensing Properties for Pd2+

A Novel Conjugated Polymer Consists of Benzimidazole and Benzothiadiazole: Synthesis, Photophysics Properties, and Sensing Properties for Pd2+

Amperometric Detection of Aqueous Silver Ions by Inhibition of Glucose Oxidase Immobilized on Nitrogen-Doped Carbon Nanotube Electrodes

Determination of trace amounts of iron by a simple fluorescence quenching method

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A Novel Conjugated Polymer Consists of Benzimidazole and Benzothiadiazole: Synthesis, Photophysics Properties, and Sensing Properties for Pd²⁺

A Novel Conjugated Polymer Consists of Benzimidazole and Benzothiadiazole: Synthesis, Photophysics Properties, and Sensing Properties for Pd²⁺