Article
Chemistry, Analytical
Wenming Pan, Tinwang Jiang, Tong Lu, Quanshan Jin, Yanhai Xi, Wenju Zhang
Summary: A new enzyme-free immunological method is proposed to detect protein biomarkers using antibodyCu3(PO4)2 hybrid nanoflowers, which exhibit high specificity and sensitivity. This method shows potential for clinical diagnosis with desirable performance and eliminates the use of enzymes.
Article
Biophysics
Xiaoning Liao, Xue Zhang, Wenjun Wang, Chanjuan Liu, Wuying Yang, Dan Wang
Summary: By integrating nanobody (Nb) with biomimetic mineralized metal-organic frameworks (MOF), the difficulty of carrying signal reporters in immunoassay is overcome, and the activity of the enzyme is protected, resulting in improved sensitivity and stability.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Biophysics
Xiaoning Liao, Xue Zhang, Wenjun Wang, Chanjuan Liu, Wuying Yang, Dan Wang
Summary: In this study, a novel immunoprobe integration system of Nanobody (Nb) and biomimetic mineralized metal-organic frameworks (MOF) was proposed, which overcomes the difficulty of carrying signal reporters for Nb. The mineralized MOF protects the succinylated horseradish peroxidase (sHRP) and facilitates substrate transport. The immunosensor exhibited good voltammetry responses for aflatoxin B-1 (AFB(1)) detection, with a linear range of 50.0 fg/mL - 20.0 ng/mL and a detection limit of 20.0 fg/mL. The specificity, stability, and reproducibility of this immunosensor were satisfactory. This work provides an alternative idea for the application of Nb in immunoassay.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Chemistry, Analytical
Alexandra Karapa, Christos Kokkinos, Peter R. Fielden, Sara J. Baldock, Nickolas J. Goddard, Anastasios Economou
Summary: This work presents a novel three-electrode plastic sensor chip for the detection of trace Hg(II) using anodic stripping voltammetry. The chip is manufactured by injection moulding, which is an eco-friendly and sustainable method. It consists of three carbon-based electrodes embedded in a plastic holder, and the reference electrode is coated with Ag using e-beam evaporation. By analyzing the sample spiked with Au(III), gold nanoparticles are formed on the working electrode, and Hg(II) co-deposits with the gold nanoparticles to form an Au(Hg) amalgam. The accumulated Hg(II) is then stripped off the electrode and measured using an anodic square wave potential scan. The sensor shows a limit of detection of 0.4 μg/L for Hg(II) and a repeatability of 5.3% at the 20 μg/L level of Hg(III) (n = 10). It is successfully applied to various samples with recoveries ranging from 98% to 107%.
Article
Chemistry, Analytical
Martijn Eikelboom, Yaxuan Wang, Gemma Portlock, Arthur Gourain, Joseph Gardner, Jay Bullen, Paul Lewtas, Matthieu Carriere, Alexandra Alvarez, Arun Kumar, Shane O'Prey, Tamas Tolgyes, Dario Omanovic, Subhamoy Bhowmick, Dominik Weiss, Pascal Salaun
Summary: The voltammetric determination of total inorganic arsenic in near-neutral pH conditions using a new commercially available 25 μm diameter gold microwire was presented. The method has better analytical parameters than previous methods and is easier to implement, enabling cheaper groundwater surveying campaigns with in-the-field analysis for quick data reporting, even in remote communities.
ANALYTICA CHIMICA ACTA
(2023)
Article
Chemistry, Multidisciplinary
E. I. Maksyutova, A. V. Sidelnikov, A. G. Mustafin, E. V. Govorov
Summary: Electrochemical methods of analysis are increasingly being used in various industries to improve product quality. This study focuses on sugar and sugar color, proposing a method to differentiate sugars and colors from different manufacturers. This method can be applied in the food industry for rapid analysis of the origin of sugar and other soluble products.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Amra Alispahic, Adela Krivohlavek, Nives Galic
Summary: The study found that adding complexing agents such as citric acid and potassium sodium tartrate in model laboratory samples and natural samples can effectively preserve As(III) species, while acetic acid alone does not have a preserving effect. The use of the differential pulse anodic stripping voltammetry technique (DPASV) achieved good resolution of inorganic arsenic species.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Analytical
Alexandra Karapa, Christos Kokkinos, Peter R. Fielden, Sara J. Baldock, Nickolas J. Goddard, Anastasios Economou
Summary: This paper reports the development of a portable system using anodic stripping voltammetry (ASV) for the determination of trace As(III) in water samples. The portable system consists of a three-electrode mini cell with plastic conductive electrodes. The accumulation of As(III) on the disposable working electrode and its subsequent detection by anodic potential scan were studied. The limit of detection was 0.2 μg L-1 and the repeatability at the 5.0 μg L-1 As(III) level was 4.7% (n = 10). The portable setup was successfully applied to analyze different groundwater samples with recoveries between 95% and 105%.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Analytical
Maria Pitsou, Christos Kokkinos, Anastasios Economou, Peter R. Fielden, Sara J. Baldock, Nickolas J. Goddard
Summary: This work presents a new environmentally friendly three-electrode electrochemical sensor for the on-site determination of toxic elements indium and thallium, achieving high sensitivity and accuracy through advanced electrochemical methods.
Article
Chemistry, Analytical
Gul Sirin Ustabasi, Ismail Yilmaz, Mustafa Ozcan, Ebru Cetinkaya
Summary: Pencil graphite electrode modified with MWCNT and Bi3+ showed improved sensitivity and reduced charge transfer resistance in the simultaneous analysis of Pb2+, Cd2+, and Zn2+. This modification method offers effective electroanalytical performance with low time consumption and cost.
Article
Electrochemistry
N. M. Omar, E. M. Mabrouk, A. Y. El-Etre, A. I. Ali, A. M. Beltagi
Summary: Due to their affordability and availability, pencil graphite electrodes (PGE) have gained popularity in electrochemical applications. A disposable modified PGE sensor based on electropolymerization was developed and showed enhanced sensitivity and lower resistivity. This sensor was successfully used for sensitive and selective determination of flufenamic acid (FFA), exhibiting good accuracy, repeatability, storage stability, and selectivity.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Electrochemistry
Domen Obrez, Mitja Kolar, Nikola Tasic, Samo B. Hocevar
Summary: Copper electrodes have interesting characteristics for electrochemical stripping analysis and can be an alternative to mercury electrodes. Different types of copper-based electrodes were studied for the detection of trace metal ions. Most of the copper electrodes showed favorable performances for stripping voltammetry.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Analytical
Mohammad Reza Jalali Sarvestani, Tayyebeh Madrakian, Abbas Afkhami
Summary: In this study, a highly sensitive electrochemical sensor was developed for the detection of ultra-trace levels of Pb2+. The sensor was modified with an in-situ electroplated bismuth film and a nanocomposite of a recently synthesized melamine based covalent organic framework and Fe3O4 nanoparticles. The combination of Fe3O4@SNW1 and the bismuth film significantly enhanced the sensitivity of the sensor towards Pb2+. The optimized sensor showed a linear response in the concentration range of 0.003-0.3 μmol L-1 with a detection limit of 0.95 nmol L-1. The sensor demonstrated good selectivity towards Pb2+ and was successfully applied for the determination of Pb2+ in different edible specimens.
Review
Electrochemistry
Rubin Gulaboski, Ivan Bogeski
Summary: This article introduces the significance of polarography and its derivative technique, pulse voltammetry, which has been developed for a century. It emphasizes the importance of pulse voltammetry as a simple and viable alternative method for mechanistic studies, analytical applications, and kinetic and thermodynamic evaluations. Furthermore, it highlights the contributions made by several women electrochemists in the theoretical and practical application of pulse voltammetric techniques.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Asmaa Galal Ali, Mahmoud Fatehy Altahan, Amr Mohamed Beltagi, Abla Ahmed Hathoot, Magdi Abdel-Azzem
Summary: This study introduces an electrochemical sensor with a carbon paste electrode modified with multiwall carbon nanotubes and poly(1-aminoanthraquinone) for the detection of selenite in water samples. The sensor exhibits good analytical performance and precision, making it applicable for wastewater analysis.