Quantum Dots as Components of Electrochemical Sensing Platforms for the Detection of Environmental and Food Pollutants: a Review

2017 ◽  
Vol 100 (4) ◽  
pp. 950-961 ◽  
Author(s):  
María Pedrero ◽  
Susana Campuzano ◽  
José M Pingarrón
Keyword(s):  
Quantum Dots ◽  
Signal Amplification ◽  
Cost Effective ◽  
Ease Of Use ◽  
Electrochemical Sensing ◽  
Multiplexed Detection ◽  
Sensing Platforms ◽  
Target Analytes

Abstract The determination of organic and inorganic environmental and food pollutants is a key matter of concern in analytical chemistry due to their effects as a serious threat to human health. Focusing on this issue, several methodologies involving the use of nanostructured electrochemical platforms have been recently reported in the literature. Among these methods, those employing the use of quantum dots (QDs) stand out because of features such as signal amplification, good reproducibility and selectivity, and the possibility for multiplexed detection, and because they preserve the outstanding characteristics of electrochemical methodologies with respect to simplicity, ease-of-use, and cost-effective instrumentation. This review describes recent electrochemical strategies, in which design QDs play a key role, for the determination of pollutants in food and environmental samples. The particular role of QDs in the reported methodologies, their preparation, and the electrochemical platform design, as well as the advantages that QDs provide in the analysis of target analytes, are critically discussed.

scholarly journals Determination of the Electrochemical Area of Screen-Printed Electrochemical Sensing Platforms

Biosensors ◽  
2018 ◽  
Vol 8 (2) ◽  
pp. 53 ◽  
Author(s):  
Alejandro García-Miranda Ferrari ◽  
Christopher Foster ◽  
Peter Kelly ◽  
Dale Brownson ◽  
Craig Banks
Keyword(s):  
Electrochemical Sensing ◽  
Sensing Platforms ◽  
Screen Printed

scholarly journals Graphene Quantum Dots-Based Nanocomposites Applied in Electrochemical Sensors: A Recent Survey

Electrochem ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 490-519
Author(s):  
Murilo H. M. Facure ◽  
Rodrigo Schneider ◽  
Jessica B. S. Lima ◽  
Luiza A. Mercante ◽  
Daniel S. Correa
Keyword(s):  
Quantum Dots ◽  
Molecularly Imprinted Polymers ◽  
Electrochemical Sensors ◽  
Graphene Quantum Dots ◽  
Electrochemical Sensing ◽  
Synthesis Methods ◽  
Current Trends ◽  
Sensing Platforms ◽  
Metal Organic ◽  
2D Nanomaterials

Graphene quantum dots (GQDs) have been widely investigated in recent years due to their outstanding physicochemical properties. Their remarkable characteristics allied to their capability of being easily synthesized and combined with other materials have allowed their use as electrochemical sensing platforms. In this work, we survey recent applications of GQDs-based nanocomposites in electrochemical sensors and biosensors. Firstly, the main characteristics and synthesis methods of GQDs are addressed. Next, the strategies generally used to obtain the GQDs nanocomposites are discussed. Emphasis is given on the applications of GQDs combined with distinct 0D, 1D, 2D nanomaterials, metal-organic frameworks (MOFs), molecularly imprinted polymers (MIPs), ionic liquids, as well as other types of materials, in varied electrochemical sensors and biosensors for detecting analytes of environmental, medical, and agricultural interest. We also discuss the current trends and challenges towards real applications of GQDs in electrochemical sensors.

scholarly journals Sensitive Determination of Cetirizine Using CdS Quantum dots as Oxidase Mimic-mediated Chemiluminescence of Sulfite

2016 ◽  
Vol 5 (7) ◽  
pp. 59-62 ◽  
Author(s):  
Reza Hoseinpour Kouhestany ◽  
Seyed Naser Azizi ◽  
Parmis Shakeri ◽  
Shaghyegh Rahmani
Keyword(s):  
Quantum Dots ◽  
Limit Of Detection ◽  
Ultra Violet ◽  
Cost Effective ◽  
Pharmaceutical Journal ◽  
Water Soluble ◽  
Cds Quantum Dots ◽  
Study Results ◽  
Cds Qds

A new chemiluminescence (CL) method using cadmium sulfide quantum dots (QDs) as sensitizers is proposed for the chemiluminometric determination of cetirizine pharmaceutical formulation. CdS QDs were synthesized by using water soluble route. The nanoparticles were structurally and optically characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Ultra Violet-Visible (UV–Vis) absorption spectroscopy and scanning electron microscopy (SEM). In this study results shows that CdS quantum dots are enhancers of the weak CL emission. Trace amounts of cetirizine improved the sensitize effect of CdS quantum dots yielding a significant chemiluminescence enhancement of the Ce(IV)–SO32?–CdS QDs system. So, a new CL analysis system was selected for the determination of cetirizine. There is a good linear relationship between the relative chemiluminescence intensity and the concentration of cetirizine in the range of 1×10?9– 1×10?6 molL?1 with a correlation coefficient (R2) of 0.9963 at the optimum conditions. The limit of detection (LOD) of this system was found to be 5×10?11 M. This method is simple, sensitive and cost effective, and also is accommodating for pharmaceutical applications.Kouhestany et al., International Current Pharmaceutical Journal, June 2016, 5(7): 59-62

Fluoroimmunoassay for the Determination of Diethylstilbestrol Residue in Chicken Muscle Tissue

2013 ◽  
Vol 726-731 ◽  
pp. 1322-1325
Author(s):  
Wen Dong ◽  
Wei Li Xue ◽  
Xin Yi Wang ◽  
Ling Yun Du ◽  
Shu Hao Wang
Keyword(s):  
Quantum Dots ◽  
Signal Amplification ◽  
Limit Of Detection ◽  
Fluorescence Immunoassay ◽  
Buffer Solution ◽  
Selective Method ◽  
Chicken Muscle ◽  
Amplification System ◽  
Signal Amplification System

A sensitive and selective method for the determination of diethylstilbestrol (DES) by fluorescence immunoassay (FIA) was established on the basis of competitive immunoreaction. The complex of avidin conjugated by quantum dots (QDs-avidin) was regarded as a probe in this system and the avidin-biotin system as the signal amplification system. After optimizing the conditions of immunoreaction such as the time and temperature of incubating, the pH of the buffer solution, the concentration of the reagent and so on, the linear range and the limit of detection of DES were 0.01-2000 ng·mL-1 and 4.5 pg·mL-1, respectively. The method was applied to determine DES in flesh of chicken, with the percent recoveries in the range of 81.0%-109.8%.

Chemometric-assisted kinetic determination of oxytetracycline using AgInS2 quantum dots as PL sensing platforms

2021 ◽  
pp. 339174
Author(s):  
Rafael C. Castro ◽  
Ricardo N.M.J. Páscoa ◽  
M.Lúcia M.F.S. Saraiva ◽  
João L.M. Santos ◽  
David S.M. Ribeiro
Keyword(s):  
Quantum Dots ◽  
Kinetic Determination ◽  
Sensing Platforms

scholarly journals Artificial Biomimetic Electrochemical Assemblies

Biosensors ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 44
Author(s):  
Tanja Zidarič ◽  
Matjaž Finšgar ◽  
Uroš Maver ◽  
Tina Maver
Keyword(s):  
Supramolecular Chemistry ◽  
Molecularly Imprinted Polymers ◽  
Cost Effective ◽  
Molecularly Imprinted ◽  
Imprinted Polymers ◽  
High Affinity ◽  
Sensor Platforms ◽  
Gate Effect ◽  
Target Analytes

Rapid, selective, and cost-effective detection and determination of clinically relevant biomolecule analytes for a better understanding of biological and physiological functions are becoming increasingly prominent. In this regard, biosensors represent a powerful tool to meet these requirements. Recent decades have seen biosensors gaining popularity due to their ability to design sensor platforms that are selective to determine target analytes. Naturally generated receptor units have a high affinity for their targets, which provides the selectivity of a device. However, such receptors are subject to instability under harsh environmental conditions and have consequently low durability. By applying principles of supramolecular chemistry, molecularly imprinted polymers (MIPs) can successfully replace natural receptors to circumvent these shortcomings. This review summarizes the recent achievements and analytical applications of electrosynthesized MIPs, in particular, for the detection of protein-based biomarkers. The scope of this review also includes the background behind electrochemical readouts and the origin of the gate effect in MIP-based biosensors.

scholarly journals Advances in the Determination of Anabolic-Androgenic Steroids: From Standard Practices to Tailor-Designed Multidisciplinary Approaches

Sensors ◽  
2021 ◽  
Vol 22 (1) ◽  
pp. 4
Author(s):  
Lukáš Huml ◽  
Jan Tauchen ◽  
Silvie Rimpelová ◽  
Barbora Holubová ◽  
Oldřich Lapčík ◽  
...  
Keyword(s):  
Biological Fluids ◽  
Cost Effective ◽  
Review Article ◽  
Anabolic Androgenic Steroids ◽  
Comprehensive Review ◽  
Standard Methods ◽  
Standard Practices ◽  
Androgenic Steroids

Anabolic-androgenic steroids (AASs), a group of compounds frequently misused by athletes and, unfortunately, also by the general population, have lately attracted global attention; thus, significant demands for more precise, facile, and rapid AAS detection have arisen. The standard methods ordinarily used for AAS determination include liquid and gas chromatography coupled with mass spectrometry. However, good knowledge of steroid metabolism, pretreatment of samples (such as derivatization), and well-trained operators of the instruments are required, making this procedure expensive, complicated, and not routinely applicable. In the drive to meet current AAS detection demands, the scientific focus has shifted to developing novel, tailor-made approaches leading to time- and cost-effective, routine, and field-portable methods for AAS determination in various matrices, such as biological fluids, food supplements, meat, water, or other environmental components. Therefore, herein, we present a comprehensive review article covering recent advances in AAS determination, with a strong emphasis on the increasingly important role of chemically designed artificial sensors, biosensors, and antibody- and fluorescence-based methods.

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