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Photo-controlled cascade DNA hybridization for amplified electrochemical biosensor with tunable sensing performance.
Anal Chim Acta
January 2025
College of Chemistry and Chemical Engineering, Yantai University, 30 Qingquan Road, Yantai 264005, China. Electronic address:
Background: Precise control of the biorecognition process in DNA biosensors, especially for those with signal amplification, remains a challenge. It is of great significance to introduce external stimuli into the DNA system for a controllable trigger of nucleic acid cascade amplification and further for excellent biosensors.
Results: In this study, a photo-initiated hybridization chain reaction (HCR) was designed for controllable and sensitive electrochemical biosensor via the incorporation of azobenzene moiety into the assembly unit.
Probabilistic health risk assessment of primary aromatic amines in polyamide cooking utensils in China by Monte Carlo simulation.
Food Chem Toxicol
November 2024
Department of Toxicology, School of Public Health, Peking University, Beijing, 100191, China. Electronic address:
The migration of primary aromatic amines (PAAs) from food contact materials raises significant public health concerns. In this study, the migration levels of 26 PAAs were analyzed in 242 nylon cooking utensils using ultra-performance liquid chromatography-tandem mass spectrometry. A total of 18 PAAs were detected, of which 14 were quantified, with 4,4'-diaminodiphenylmethane (4,4'-MDA) and aniline being the most prevalent ones.
View Article and Find Full Text PDFRational design of carbon dot nanozymes for ratiometric dual-signal and smartphone-assisted visual detection of nitrite in food matrices.
J Hazard Mater
December 2024
School of Chemistry and Chemical Engineering and Institute of Environmental Science, Shanxi University, Taiyuan 030006, PR China. Electronic address:
Developing reliable nitrite (NO) sensors is essential for food safety and reducing health risks from NO exposure. In this study, we strategically designed nitrogen-doped carbon dot (N-CD) nanozymes to establish an accessible dual-signal ratiometric sensing system for detecting NO in food matrices. This system utilizes the photoluminescence and enzyme-like properties of N-CD nanozymes combined with NO-triggered diazotization reactions of substrates such as o-phenylenediamine (OPD) or 3,3',5,5'-tetramethylbenzidine (TMB).
View Article and Find Full Text PDFA colorimetric sensor based on multiple elements doped carbon dot nanozyme for rapid detection of 1-naphthol in human urine samples.
J Colloid Interface Sci
January 2025
College of Chemical Engineering and Environment, China University of Petroleum-Beijing, Beijing 102249, China. Electronic address:
Article Synopsis
- Residual carbaryl in crops poses risks to human health, especially damaging kidneys and the nervous system upon entering the body, which can be tracked by monitoring levels of 1-naphthol (1-NAP).
- Co, N, P ternary co-doped carbon dots (CoNP-CDs), made from vitamin B12, exhibit dual enzyme-like activities that generate reactive radicals to facilitate the colorimetric detection of 1-NAP.
- A smartphone-assisted sensing platform was developed that allows for fast and simple detection of 1-NAP in human urine, showing a linear detection range and a low visual detection limit.
Electrospun nanofibers-based thin film microextraction for enrichment of phthalate esters in biodegradable plastics.
J Sep Sci
July 2024
College of Chemistry, Beijing University of Chemical Technology, Beijing Key Laboratory of Environmentally Harmful Chemical Analysis, Beijing University of Chemical Technology, Beijing, P. R. China.
In this work, a novel electrospun nanofiber (PAN/TpBD; 2,4,6-triformylphloroglucinol [Tp] and benzidine [BD]; polyacrylonitrile [PAN]) was fabricated via a facile electrospinning method and utilized as adsorbent in thin film microextraction (TFME) of phthalate esters (PAEs) (dimethyl phthalate, diethyl phthalate, diallyl phthalate, dibutyl phthalate, and dioctyl phthalate) in biodegradable plastics. The prepared PAN/TpBD combines the strong stability of nanofibers with increased exposure sites for covalent organic frameworks and enhanced interactions with the target, thus improving the enrichment effect on the target. The extraction efficiency of PAN/TpBD reached above 80%.
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