Gold and Silver Nanoparticle-Based Colorimetric Sensors: New Trends and Applications

Alberti, Giancarla; Zanoni, Camilla; Magnaghi, Lisa Rita; Biesuz, Raffaela

doi:10.3390/chemosensors9110305

Cited by 70 publications

(29 citation statements)

References 155 publications

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“…The obvious color changes in the sensing probes enable direct observation with the naked eyes upon the addition of target analytes. Recently, silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs) have been used as colorimetric probes for sensing various analytes due to their unique optical and electronic properties [ 15 , 16 , 17 ]. AgNPs possess high extinction coefficients and strongly localized surface plasmon resonances in the visible region, which are very sensitive to the size, shape, and surrounding chemical environment [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Sodium-Alginate-Functionalized Silver Nanoparticles for Colorimetric Detection of Dimethoate

Zhou

Chang

et al. 2022

Biosensors

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Sodium alginate (SA) was used to functionalize the surfaces of silver nanoparticles (AgNPs) to form SA-AgNPs for sensing dimethoate with a rapid and sensitive visual readout. UV–Vis spectrophotometry, Fourier transform infrared spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and zeta potential measurements were used to characterize SA-AgNPs that were synthesized under the ideal conditions. SA-AgNPs were spherical with an average size of 14.6 nm. The stability of SA-AgNPs was investigated with changes in pH, salinity, and storage time. This colorimetric assay of dimethoate relied on the change in the absorption ratio (A475/A400) of SA-AgNPs, resulting in their aggregation caused by dimethoate, leading to a visual change for SA-AgNPs from yellow to pale yellow. As a result, the absorption ratio (A475/A400) of SA-AgNPs showed good linearity in the range of 0.05 to 2.0 ppm (R2 = 0.9986) with a limit of detection (LOD) of 30 ppb. Adding other pesticides did not significantly change the absorption ratio of SA-AgNPs, indicating its high selectivity as a colorimetric assay. The sensor was successfully used to detect dimethoate in actual water samples.

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Section: Introductionmentioning

confidence: 99%

Sodium-Alginate-Functionalized Silver Nanoparticles for Colorimetric Detection of Dimethoate

Zhou

Chang

et al. 2022

Biosensors

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“…AuNPs and AgNPs are currently used as colorimetric detectors for metal ions (Cd, Hg, Fe, etc.) [ 141 , 142 ]. Their application has emerged as one of the most promising analytical approaches for detecting analytes.…”

Section: Synthesis Of Gold and Silver Nanoparticles Using Plant Extractsmentioning

confidence: 99%

Biosynthesis of Gold and Silver Nanoparticles Using Phytochemical Compounds

2023

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Gold and silver nanoparticles are nanoparticles that have been widely used in various fields and have shown good benefits. The method of nanoparticle biosynthesis utilizing plant extracts, also known as green synthesis, has become a promising method considering the advantages it has compared to other synthesis methods. This review aims to give an overview of the phytochemical compounds in plants used in the synthesis of gold and silver nanoparticles, the nanoparticle properties produced using plant extracts based on the concentration and structure of phytochemical compounds, and their applications. Phytochemical compounds play an important role as reducing agents and stabilizers in the stages of the synthesis of nanoparticles. Polyphenol compounds, reducing sugars, and proteins are the main phytochemical compounds that are responsible for the synthesis of gold and silver nanoparticles. The concentration of phytochemical compounds affects the physical properties, stability, and activity of nanoparticles. This is important to know to be able to overcome limitations in controlling the physical properties of the nanoparticles produced. Based on structure, the phytochemical compounds that have ortho-substituted hydroxyl result in a smaller size and well-defined shape, which can lead to greater activity and stability. Furthermore, the optimal condition of the biosynthesis process is required to gain a successful reaction that includes setting the metal ion concentration, temperature, reaction time, and pH.

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“…Au/Ag NPs are the most commonly used nanoparticulate platforms for biosensing applications broadly based on direct colorimetric (aggregation-based) visualization (Vilela et al, 2012), metal-enhanced fluorescence (MEF) (Y. Jeong Copyright by American Chemical Society (Kim et al, 2018;Russo et al, 2018) et al, 2018) and surface-SERS (Langer et al, 2020); Au NPs are also commonly used in colorimetric detection technologies (i.e., lateral flow immunochromatic assays) due to their SPR in the visible regime (Alberti et al, 2021;Sabela et al, 2017). These methods are often integrated under a single-biosensing platform to augment signal sensitivity and improve device utility.…”

Section: Au-and Ag-based Bioensorsmentioning

confidence: 99%

Recent developments in the use of gold and silver nanoparticles in biomedicine

Pasparakis

2022

WIREs Nanomed Nanobiotechnol

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Gold and silver nanoparticles (NPs) are widely used in the biomedical research both in the therapeutic and the sensing/diagnostics fronts. Both metals share some common optical properties with surface plasmon resonance being the most widely exploited property in therapeutics and diagnostics. Au NPs exhibit excellent light‐to‐heat conversion efficiencies and hence have found applications primarily in precision oncology, while Ag NPs have excellent antibacterial properties which can be harnessed in biomaterials' design. Both metals constitute excellent biosensing platforms owing to their plasmonic properties and are now routinely used in various optical platforms. The utilization of Au and Ag NPs in the COVID‐19 pandemic was rapidly expanded mostly in biosensing and point‐of‐care platforms and to some extent in therapeutics. In this review article, the main physicochemical properties of Au and Ag NPs are discussed with selective examples from the recent literature. This article is categorized under: Therapeutic Approaches and Drug Discovery > Nanomedicine for Oncologic Disease Diagnostic Tools > In Vitro Nanoparticle‐Based Sensing Nanotechnology Approaches to Biology > Nanoscale Systems in Biology

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Gold and Silver Nanoparticle-Based Colorimetric Sensors: New Trends and Applications

Cited by 70 publications

References 155 publications

Sodium-Alginate-Functionalized Silver Nanoparticles for Colorimetric Detection of Dimethoate

Sodium-Alginate-Functionalized Silver Nanoparticles for Colorimetric Detection of Dimethoate

Biosynthesis of Gold and Silver Nanoparticles Using Phytochemical Compounds

Recent developments in the use of gold and silver nanoparticles in biomedicine

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