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In this study, we demonstrate the successful development of an electrochemical aptamer-based sensor for point-of-use detection and quantification of the highly potent microcystin-LR (MC-LR) in water. The sensor uses hexaammineruthenium(III) chloride ([Ru(NH)]) as redox mediator, because of the ability of the positively charged (3+) molecule to associate with the phosphate backbone of the nucleic acids. We quantitatively measure the target-induced displacement of aptamer associated, or surface confined, [Ru(NH)] in the presence of MC-LR. Upon the addition of MC-LR in the water, surface-confined [Ru(NH)] dissociates, resulting in less faradaic current from the reduction of [Ru(NH)] to [Ru(NH)] Sensing surfaces of highly packed immobilized aptamers were capable of recording decreasing square wave voltammetry (SWV) signals after the addition of MC-LR in buffer. As a result, SWV recorded substantial signal suppression within 15 min of target incubation. The sensor showed a calculated limit of detection (LOD) of 9.2 pM in buffer. The effects of interferents were minimal, except when high concentrations of natural organic matter (NOM) were present. Also, the sensor performed well in drinking water samples. These results indicate a sensor with potential for fast and specific quantitative determination of MC-LR in drinking water samples. A common challenge when developing electrochemical, aptamer-based sensors is the need to optimize the nucleic acid aptamer in order to achieve sensitive signaling. This is particularly important when an aptamer experiences only a small or localized conformational change that provides only a limited electrochemical signal change. This study suggests a strategy to overcome that challenge through the use of a nucleic acid-associated redox label.
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http://dx.doi.org/10.1021/acsestengg.1c00256 | DOI Listing |
J Phys Chem Lett
December 2024
Toyota Central R&D Laboratories, Inc., Nagakute 480-1192, Aichi, Japan.
The modification of Pt surfaces with organic compounds like melamine enhances oxygen reduction reaction activity and catalyst durability. Through first-principles free energy calculations utilizing thermodynamic integration and finite-temperature molecular dynamics, enhanced by machine learning force fields for efficient sampling of nanosecond-scale interfacial water fluctuations and incorporating corrections to accurately reproduce first-principles free energies, we demonstrate that melamine destabilizes OH adsorbates, facilitating their removal and enhancing catalytic activity. Unlike alloys, where OH destabilization is driven by changes in electronic structure and surface strain, melamine disrupts hydrogen bonding between OH and interfacial water.
View Article and Find Full Text PDFWei Sheng Yan Jiu
November 2024
Shenzhen Center for Chronic Disease Control, Shenzhen 518020, China.
Objective: To explore the differences in fat and fatty acids content between freshwater and saltwater fish.
Methods: The fat and fatty acids content in 83 fish meat samples from four regions(Hainan, Jiangsu, Fujian, and Guangxi) were detected by national standard method. Mann-Whitney U tests and t-tests were used to compare the differences in fat and major fatty acid content between freshwater and saltwater fish.
Vopr Kurortol Fizioter Lech Fiz Kult
December 2024
Siberian State Medical University, Tomsk, Russia.
Stanislav Iosofatovich Zalesky - the first head of the Department of General Medical Chemistry of the Imperial Tomsk University (currently the Department of Chemistry of the Siberian State Medical University), a versatile scientist and public figure, acknowledged expert in medical, chemical, hydrogeological and balneological sciences. Professor S.I.
View Article and Find Full Text PDFEnviron Geochem Health
December 2024
Department of Chemistry, North Carolina State University, Raleigh, NC, USA.
This study investigated the occurrence, concentration and human health risks of five pharmaceutical residues-metronidazole, sulfamethoxazole, ciprofloxacin, carbamazepine, and caffeine-in groundwater and surface water samples from Kampala and Mbarara districts of Uganda. The present study also employed techniques of remote sensing and geographic information system (GIS); thereby, emphasizing the importance of thematic mapping, land use classification, and spatial buffering to evaluate pharmaceutical contaminants in an environmental setting. The risk quotient (RQ) approach was also employed to assess the risk of exposure to the pharmaceutical contaminants.
View Article and Find Full Text PDFEnviron Geochem Health
December 2024
State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Beijing Normal University, Beijing, 100875, China.
Around 2.6 billion people are at risk of tooth carries and fluorosis worldwide. Quetta is the worst affected district in Balochistan plateau.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!