A Quinoxaline−Naphthaldehyde Conjugate for Colorimetric Determination of Copper Ion

Sahu, Sutapa; Sikdar, Yeasin; Bag, Riya; Drew, Michael G. B.; Cerón‐Carrasco, José P.; Goswami, Sanchita

doi:10.3390/molecules27092908

Cited by 7 publications

(2 citation statements)

References 52 publications

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“…As shown in Figure a, fluorescence intensity gradually decreases with the increasing concentrations, which even have an intensity change with 500 pM Cu 2+ . The system has higher sensitivity and lower reagent consumption than other sensors − (Table S2). The fluorescence intensity varies bilinearly with the concentration of Cu 2+ (Figure b).…”

Section: Resultsmentioning

confidence: 99%

Photothermal Waveguide-Directed Microreactor for Enhanced Copper Ion Detection from Quantum Dots

Wang

et al. 2022

ACS Appl. Nano Mater.

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Currently, the frontier of nanomaterials has been an extraordinary way for biological and chemical analysis. Using quantum dots (QDs) has served as a promising strategy for copper ion sensing. Various microreactors have been utilized to enhance the sensitivity and stability and shorten the detection time. By integrating a photothermal waveguide into a microfluidic platform, we have developed a photothermal microreactor for enhanced copper ion detection. Temperature gradient, intense vaper microbubbles, vortex, and microdroplets can be simultaneously generated due to the enhanced photothermal effect of graphene oxide and the evanescent field of microfiber. Due to the cooperation of gathering QDs by vortex fields, enlarging surface area on account of droplets, and accelerating molecular motion based on increasing temperature, this system can achieve highly enhanced detection of copper ions in a small sample volume of 2 μL within 5 min, where the detection limit is 3 orders of magnitudes lower than that of the original method. Such a photothermal microreactor is pollution-free and cost-effective with high efficiency and hypotoxicity, being highly potential as a powerful micro-sensing strategy for environmental monitoring as well as chemical analysis.

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Section: Resultsmentioning

confidence: 99%

Photothermal Waveguide-Directed Microreactor for Enhanced Copper Ion Detection from Quantum Dots

Wang

et al. 2022

ACS Appl. Nano Mater.

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“…In terms of analytical chemistry, a vast number of recent analytical methods have been developed and validated for the quantification of Cu 2+ in several samples, including biochemical, food, water, and wastewater samples. These methods are mainly spectroscopic and require expensive instrumentation and specialized staff, including batch UV-Vis spectrometry [ 11 , 12 , 13 , 14 ], flame atomic absorption spectroscopy (FAAS) [ 15 , 16 , 17 , 18 ], graphite furnace atomic absorption spectrometry (GFAAS) [ 19 , 20 ], inductively coupled plasma (ICP) [ 21 , 22 ], flow injection [ 23 ], and fluorescence [ 24 , 25 , 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

A Low-Cost Colorimetric Assay for the Analytical Determination of Copper Ions with Consumer Electronic Imaging Devices in Natural Water Samples

Gkouliamtzi,

Tsaftari,

Tarara

et al. 2023

Molecules

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This study reports a new approach for the determination of copper ions in water samples that exploits the complexation reaction with diethyldithiocarbamate (DDTC) and uses widely available imaging devices (i.e., flatbed scanners or smartphones) as detectors. Specifically, the proposed approach is based on the ability of DDTC to bind to copper ions and form a stable Cu-DDTC complex with a distinctive yellow color detected with the camera of a smartphone in a 96-well plate. The color intensity of the formed complex is linearly proportional to the concentration of copper ions, resulting in its accurate colorimetric determination. The proposed analytical procedure for the determination of Cu2+ was easy to perform, rapid, and applicable with inexpensive and commercially available materials and reagents. Many parameters related to such an analytical determination were optimized, and a study of interfering ions present in the water samples was also carried out. Additionally, even low copper levels could be noticed by the naked eye. The assay performed was successfully applied to the determination of Cu2+ in river, tap, and bottled water samples with detection limits as low as 1.4 µM, good recoveries (89.0–109.6%), adequate reproducibility (0.6–6.1%), and high selectivity over other ions present in the water samples.

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Design and development of an azo dye‐based ultra‐sensitive chemosensor for the ubiquitous organic anion in aqueous solutions

Tavallali,

Ostovar,

Parhami

et al. 2024

J Chinese Chemical Soc

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Oxalate plays a crucial role in various biological and industrial applications. Its involvement in diseases, drug‐ and toxin‐induced disorders, and disruption of industrial processes makes it a high‐priority chemical for the development of more precise, selective, and straightforward analytical methods. Herein, an innovative and efficient strategy for sequentially measuring Cu2+ and oxalate ions is reported. During an indicator displacement process, where Cu2+ and azo dye, ArsenazoIII (AAIII), are used as receiver and indicator, respectively, oxalate (C2O42−) is measured by a colorimetric method. Proof of concept results from UV–visible spectroscopy, naked eye, and signal reset of the indicator revealed a more robust interaction of the Cu2+ receptor with C2O42− than the AAIII indicator with high selectivity, good sensitivity, and lower detection limit(4.01 × 10−8 and 3.04 × 10−9mol L−1, for Cu2+ and C2O42−, respectively). The results of measuring C2O42− in actual samples (urine, mushrooms, and spinach) showed the applicability of the existing method. Most importantly, the colorimetric system based on molecular exchange in the indicator dislocation proceeding can serve as a colorimetric INHIBIT logic‐gate. It works like a molecular keypad lock system that can be controlled by two users with two different sets of chemical passwords (inputs) that can be identified through optical paths.

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A Quinoxaline−Naphthaldehyde Conjugate for Colorimetric Determination of Copper Ion

Cited by 7 publications

References 52 publications

Photothermal Waveguide-Directed Microreactor for Enhanced Copper Ion Detection from Quantum Dots

Photothermal Waveguide-Directed Microreactor for Enhanced Copper Ion Detection from Quantum Dots

A Low-Cost Colorimetric Assay for the Analytical Determination of Copper Ions with Consumer Electronic Imaging Devices in Natural Water Samples

Design and development of an azo dye‐based ultra‐sensitive chemosensor for the ubiquitous organic anion in aqueous solutions

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