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Anal Chem 2022 Jun 27. Epub 2022 Jun 27.

Department of Biomedical Engineering, College of Engineering and Applied Sciences, Nanjing National Laboratory of Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, Nanjing University, Nanjing, Jiangsu 210023, China.

Developing a universal strategy to measure catalase (CAT)/CAT-like activity, on one hand, overcomes limitations on current assays, such as moderate sensitivity and limited sample scope; on the other hand, facilitates insightful studies on applications of CAT and CAT-like nanozymes. Herein, the oxygen-sensitive and HO-inhibitory self-polymerization of dopamine (DA) was demonstrated as an activity indicator of CAT or CAT-like nanozymes, which monitors the catalytically generated O in a hypoxic environment. A typical assay for natural CAT was achieved under the optimized conditions. Read More

Biosensors (Basel) 2022 Jun 16;12(6). Epub 2022 Jun 16.

Institute of Inspection and Testing for Industrial Products of Jiangxi General Institute of Testing, Nanchang 330052, China.

G-quadruplexes have received significant attention in aptasensing due to their structural polymorphisms and unique binding properties. In this work, we exploited the fluorescence-quenching properties of G-quadruplex to develop a simple, fast, and sensitive platform for fluorescence detection of ochratoxin A (OTA) and potassium ions (K) with a label-free fluorophore and quencher strategy. The quenching ability of G-quadruplex was confirmed during the recognition process after the formation of the G-quadruplex structure and the quenching of the labeled fluorescein fluorophore (FAM). Read More

Biosensors (Basel) 2022 May 24;12(6). Epub 2022 May 24.

Department of Chemistry, National Chung Hsing University, Taichung 402, Taiwan.

A simple, one-step and facile method has been introduced to prepare fluorescent and electrochemically active carbon nanoparticles with single-size distribution and good long-term stability by electrochemical exfoliation of polyacrylonitrile-based carbon fibers in an alkaline solution-phase condition. The preparation condition was systematically optimized by studying the effect of temperature and electrolytes. It has been found that an electrochemical exfoliation reaction carried out at an applied potential of 2 V vs. Read More

Chemosphere 2022 Oct 13;304:135331. Epub 2022 Jun 13.

Department of Industrial Biotechnology, Government College of Technology, Coimbatore, 641013, India.

In the latest times, considerable studies have been performed closer to detecting emerging pollutant such as paracetamol in wastewater. Electrochemical sensor developments have recently started to determine in fewer concentrations effectively. The detection of paracetamol using standard protocols corresponding to electroanalytical techniques has a greater impact noticed in directing the detecting process toward biosensors. Read More

Spectrochim Acta A Mol Biomol Spectrosc 2022 Oct 9;279:121459. Epub 2022 Jun 9.

College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China; State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, PR China; University of Science and Technology of China, Hefei 230026, China. Electronic address:

N-hydroxyphthalimide (NHPI) is an efficient organic catalyst and an important chemical raw material which can be used as an intermediate in organic synthesis of drugs and pesticides. In this study, NHPI has been used as a coreactant of lucigenin chemiluminescence (CL) for the first time. The CL of the developed system is significantly enhanced in the presence of Co. Read More