Electrochemiluminescence aptasensor for multiple determination of Hg2+ and Pb2+ ions by using the MIL-53(Al)@CdTe-PEI modified electrode

Dang

Advances in Polymer Technology

et al. 2020

A metal-organic framework MIL-53(Fe) was successfully synthesized by a simple hydrothermal method. A synthesized MIL-53(Fe) sample was characterized, and results indicated that the formed MIL-53(Fe) was a single phase with small particle size of 0.8 μm and homogeneous particle size distribution was obtained. The synthesized MIL-53(Fe) has been used to modify a glassy carbon electrode (GCE) by a drop-casting technique. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements of the MIL-53(Fe)-modified GCE showed that the MIL-53(Fe) was successfully immobilized onto the GCE electrode surface and the electrochemical behavior of the GCE/MIL-53(Fe) electrode was stable. In addition, several electrochemical parameters of MIL-53(Fe)-modified GCE (GCE/MIL-53(Fe)) including the heterogeneous standard rate constant ( k 0 ) and the electrochemically effective surface area ( A ) were calculated. Obtained results demonstrated that the synthesized MIL-53(Fe) with the small particle size, highly homogeneous particle size, and high electrochemically effective surface area was able to significantly enhance the electrochemical response signal of the working electrode. Therefore, the GCE/MIL-53(Fe) electrode has been used as a highly sensitive electrochemical sensor for cadmium ion (Cd(II)) monitoring in aqueous solution using differential pulse voltammetry (DPV) technique. The response signal of the electrochemical sensor increased linearly in the Cd(II) ion concentration range from 150 nM to 450 nM with the limit of detection (LOD) of 16 nM.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Metal-Organic Framework MIL-53(Fe): Synthesis, Electrochemical Characterization, and Application in Development of a Novel and Sensitive Electrochemical Sensor for Detection of Cadmium Ions in Aqueous Solutions

Dang

Advances in Polymer Technology

et al. 2020

“…The average recovery in the actual sample was 96.55–102.78%, which proved that this method had high accuracy. Moreover, Feng and Li [ 119 ] developed an electrochemiluminescence (ECL) sensor for simultaneous detection of Pb 2+ and Hg 2+ . The Pb 2+ and Hg 2+ aptamers combined with targets to form G-quadruple and hairpin structure, resulting in ECL intensity difference.…”

Section: Aptasensors For Heavy Metals Ion Detectionmentioning

confidence: 99%

Advances in aptamer screening and aptasensors’ detection of heavy metal ions

et al. 2021

Heavy metal pollution has become more and more serious with industrial development and resource exploitation. Because heavy metal ions are difficult to be biodegraded, they accumulate in the human body and cause serious threat to human health. However, the conventional methods to detect heavy metal ions are more strictly to the requirements by detection equipment, sample pretreatment, experimental environment, etc. Aptasensor has the advantages of strong specificity, high sensitivity and simple preparation to detect small molecules, which provides a new direction platform in the detection of heavy metal ions. This paper reviews the selection of aptamers as target for heavy metal ions since the 21th century and aptasensors application for detection of heavy metal ions that were reported in the past five years. Firstly, the selection methods for aptamers with high specificity and high affinity are introduced. Construction methods and research progress on sensor based aptamers as recognition element are also introduced systematically. Finally, the challenges and future opportunities of aptasensors in detecting heavy metal ions are discussed.

“…[ 11‐16 ] Furthermore, the introduction of additional functional groups into the MOF architectures has the potential to enrich their functional diversity. To date, many methods based on MOFs have been developed for the biomolecules sensing and bioimaging, such as electrochemiluminescence, [ 17 ] surface‐enhanced Raman scattering, [ 18‐19 ] MRI, [ 20 ] and photoelectrochemical sensors. [ 13 ] In particular, MOFs with excellent binding ability to fluorescent materials and guest molecules have a great superiority to fabricate fluorescent nanocomposites for bioimaging in living cells and in vivo .…”

Section: Introductionmentioning

confidence: 99%

Metal‐Organic Frameworks‐Based Fluorescent Nanocomposites for Bioimaging in Living Cells and in vivo^†

et al. 2021

Metal‐organic frameworks (MOFs) as a class of porous functional materials have attracted more and more attention for biomedical applications. To date, MOFs have been developed for bioimaging based on a series of advantages such as the large surface areas, high porosity, fluorescence functionalities and good biocompatibility. It is worth noting that organic or inorganic fluorescent materials such as fluorescent dyes, quantum dots, metal nanoclusters and nanosheets can combine MOFs or be encapsulated in MOFs to form fluorescent nanocomposites for excellent imaging function. Importantly, excellent imaging capabilities are of great significance in living cells and in vivo for detection, diagnosis and cancer therapy. In this review, we focus on the recent research of the bioimaging in living cells and in vivo based on various MOF‐based nanocomposites and their potential biological clinical applications.