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Anal Chem 2022 May 17. Epub 2022 May 17.

Department of Chemistry, School of Engineering Science in Chemistry, Biochemistry and Health, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.

We present a phenomenon consisting of the synergistic effects of a capacitive material, such as carbon nanotubes (CNTs), and an ion-selective, thin-layer membrane. CNTs can trigger a charge disbalance and propagate this effect into a thin-layer membrane domain under mildly polarization conditions. With the exceptional selectivity and the fast establishment of new concentration profiles provided by the thin-layer membrane, a selective ion capture from the solution is expected, which is necessarily linked to the charge generation on the CNTs lattice. Read More

Mikrochim Acta 2022 May 17;189(6):221. Epub 2022 May 17.

Materials Science Engineering Program, University of California San Diego, La Jolla, San Diego, CA, 92093, USA.

Nitrate is an important marker of water quality that can be challenging to detect in seawater due to the presence of multiple chemical interferants and high background chloride. Here, we demonstrate a compact microfluidic device that incorporates electrochemical desalination to selectively remove the interfering chloride ions and improve the detection limit of the downstream potentiometric nitrate sensor. The microfluidic platform was fabricated by a low-cost cut-and-lamination approach, and the detection mechanism was based on potentiometric measurements at an Ag/AgCl electrode coated with a nitrate-selective membrane. Read More

RSC Adv 2021 Oct 27;11(55):34820-34827. Epub 2021 Oct 27.

Department of Chemistry, College of Science, Al-Nahrain University Baghdad Al-Jaderia Iraq

A new and sensitive potentiometric method has been developed and characterized for four novel sensors responsive to ondansetron hydrochloride. The potentiometric sensor method includes advancement of ondansetron hydrochloride sensors using a membrane comprised of molybdophosphoric acid (MPA) and ondansetron as an electro-active material in a polyvinylchloride (PVC) matrix membrane plasticized with di-butyl phthalate (DBPH), -nitrophenyloctyl ether (-NPOE), di-octyl phthalate (DOPH), or di-butyl phosphate (DBP). The validity of sensors in the present work has been examined, and steady and reproducible responses were obtained over the concentration ranges of 7. Read More

RSC Adv 2021 Nov 2;11(61):38774-38781. Epub 2021 Dec 2.

Department of Chemistry, Faculty of Science, Ain Shams University Cairo 11566 Egypt

All-solid state screen-printed electrodes were fabricated for chlorogenic acid (CGA) detection. The screen-printed platforms were modified with multi-walled carbon nanotubes (MWCNTs) to work as a lipophilic solid-contact transducer. The sensing-membrane was plasticized with a suitable solvent mediator and incorporating [Ni(bathophenanthroline)][CGA] complex as a sensory material. Read More

RSC Adv 2021 Nov 10;11(57):36215-36221. Epub 2021 Nov 10.

Infochemistry Scientific Center of ITMO University 191002 Saint Petersburg Russian Federation

Nowadays, there are several methods for the detection of various bioelements during SARS-CoV-2. Many of them require special equipment, high expenses, and a long time to obtain results. In this study, we aim to use polyelectrolyte multilayers for robust carbon fiber-based potentiometric sensing to determine the ion concentration in human biofluids of COVID-19 patients. Read More