Anti-aggregation of gold nanoparticles for metal ion discrimination: A promising strategy to design colorimetric sensor arrays

Najafzadeh, Fatemeh; Ghasemi, Forough; Hormozi-Nezhad, M. Reza

doi:10.1016/j.snb.2018.05.065

Cited by 81 publications

(20 citation statements)

References 67 publications

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“…In the present study, we exploited the visible color change of GNs with a change in the pH of the surrounding medium (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12) due to the agglomeration of GNs to demonstrate the smart phone-based colorimetric sensing of pH. An ingeniously developed handset independent Android application based on CIELab 1931 analysis was used for the precise determination of the pH value.…”

Section: Discussionmentioning

confidence: 99%

“…However, upon aggregation, due to the change in any property of a dispersive medium (such as pH and temperature), the SPR position of the GNs shis to a longer wavelength and the solution changes correspondingly from pink to bluepurple. Since the assemblies of GNs are oen accompanied by distinct color changes, colorimetric sensors using GNs have been widely explored, which have found application in the detection of pH, 4,5 DNA, 6,7 proteins 8,9 and metallic ions 10,11 and rapid identication of microorganisms. 12 Thus, the synthesis of GNs with pH-responsive optical properties is becoming increasingly important in the elds of ecology, agriculture, industry, food, medicine, and biology.…”

Section: Introductionmentioning

confidence: 99%

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Gold nanostructures for the sensing of pH using a smartphone

et al. 2019

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Gold nanostructures for the sensing of pH using a smartphone

et al. 2019

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“…With the rapid advancements in novel materials and nanotechnology, signal-amplification strategies that hold great potential to eliminate these limitations of CLFA have been developed in recent years. Significant effort has been dedicated to increasing light output yield, including controlling the physicochemical properties of the nanoparticle markers (such as metal label size and shape [ 31 , 32 , 33 ]), functionalizing nanocomposites with polymers [ 34 , 35 ], or employing enzyme-mimicking noble metal NPs [ 36 , 37 , 38 , 39 ].…”

Section: Colorimetric Signal Amplificationmentioning

confidence: 99%

Advanced Signal-Amplification Strategies for Paper-Based Analytical Devices: A Comprehensive Review

Hoang

Phan

et al. 2021

Biomedicines

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Paper-based analytical devices (PADs) have emerged as a promising approach to point-of-care (POC) detection applications in biomedical and clinical diagnosis owing to their advantages, including cost-effectiveness, ease of use, and rapid responses as well as for being equipment-free, disposable, and user-friendly. However, the overall sensitivity of PADs still remains weak, posing a challenge for biosensing scientists exploiting them in clinical applications. This review comprehensively summarizes the current applicable potential of PADs, focusing on total signal-amplification strategies that have been applied widely in PADs involving colorimetry, luminescence, surface-enhanced Raman scattering, photoacoustic, photothermal, and photoelectrochemical methods as well as nucleic acid-mediated PAD modifications. The advances in signal-amplification strategies in terms of signal-enhancing principles, sensitivity, and time reactions are discussed in detail to provide an overview of these approaches to using PADs in biosensing applications. Furthermore, a comparison of these methods summarizes the potential for scientists to develop superior PADs. This review serves as a useful inside look at the current progress and prospective directions in using PADs for clinical diagnostics and provides a better source of reference for further investigations, as well as innovations, in the POC diagnostics field.

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“…Colorimetric sensor arrays have been developed to discriminate various analytes with similar characters. − Cross-reactive sensing elements are employed to generate specific response patterns of each analyte, and these fingerprint-like patterns of analytes can be processed by statistical methods to discriminate analytes. Even though colorimetric arrays have been applied to the discrimination of pesticides, − no arrays were able to distinguish different DTCs.…”

Section: Introductionmentioning

confidence: 99%

Catechol Dyes–Tyrosinase System for Colorimetric Determination and Discrimination of Dithiocarbamate Pesticides

Wang

Liu

Duan

et al. 2020

J. Agric. Food Chem.

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A convenient and straightforward method, which is based on catechol dyes and tyrosinase, for colorimetric determination and discrimination of dithiocarbamate pesticides (DTCs) has been fabricated. Three catechol dyes, including pyrocatechol violet (PV), pyrogallol red (PR), and bromopyrogallol red (BPR), were chosen as both substrates and indicators in this method. Tyrosinase can facilitate oxidation of the catechol dyes, altering color and absorbance spectra of the dyes. DTCs can alter the absorbance spectra of the catechol dyes–tyrosinase system due to their inhibitory effects on tyrosinase. As a result, the detection limit of the PV–tyrosinase system on ziram was determined to be 4.5 μg L–1. By implementing PV–tyrosinase, PR–tyrosinase, and BPR–tyrosinase, the colorimetric array successfully distinguished six DTCs (thiram, ziram, diram, ferbam, metiram, and mancozeb) at 5.0 μM using principal component analysis (PCA). The system can also determine ziram and distinguish DTCs in real samples. Furthermore, a smartphone can be used as a detector in this system to improve its real-world applications.

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Anti-aggregation of gold nanoparticles for metal ion discrimination: A promising strategy to design colorimetric sensor arrays

Cited by 81 publications

References 67 publications

Gold nanostructures for the sensing of pH using a smartphone

Gold nanostructures for the sensing of pH using a smartphone

Advanced Signal-Amplification Strategies for Paper-Based Analytical Devices: A Comprehensive Review

Catechol Dyes–Tyrosinase System for Colorimetric Determination and Discrimination of Dithiocarbamate Pesticides

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