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Spectrophotometric determination of phosphate using sodium molybdate and its field application to the simultaneous measurement with ammonium in seawater.
Spectrochim Acta A Mol Biomol Spectrosc
December 2024
Third Institute of Oceanography, Ministry of Natural Resources, 361005 Xiamen, Fujian, China. Electronic address:
Phosphate (PO) and ammonium (NH), two major components of the phosphorus and nitrogen cycles, respectively, play vital roles in aquatic ecosystems. Very few studies have reported methods for the simultaneous determination of PO and NH in seawater. Additionally, when ammonium molybdate solution was employed as a chromogenic reagent for the simultaneous determination of both PO and NH in a single analysis system, there was a possibility of cross-contamination.
View Article and Find Full Text PDFA Highly Stable Electrochemical Sensor Based on a Metal-Organic Framework/Reduced Graphene Oxide Composite for Monitoring the Ammonium in Sweat.
Biosensors (Basel)
December 2024
Guangdong Laboratory of Artificial Intelligence and Digital Economy (SZ), Shenzhen 518107, China.
The demand for non-invasive, real-time health monitoring has driven advancements in wearable sensors for tracking biomarkers in sweat. Ammonium ions (NH) in sweat serve as indicators of metabolic function, muscle fatigue, and kidney health. Although current ion-selective all-solid-state printed sensors based on nanocomposites typically exhibit good sensitivity (~50 mV/log [NH]), low detection limits (LOD ranging from 10 to 10 M), and wide linearity ranges (from 10 to 10 M), few have reported the stability test results necessary for their integration into commercial products for future practical applications.
View Article and Find Full Text PDFAmmonium Sensing Patch with Ultrawide Linear Range and Eliminated Interference for Universal Body Fluids Analysis.
Nanomicro Lett
December 2024
School of Microelectronics, Southern University of Science and Technology, Shenzhen, 518055, People's Republic of China.
Ammonium level in body fluids serves as one of the critical biomarkers for healthcare, especially those relative to liver diseases. The continuous and real-time monitoring in both invasive and non-invasive manners is highly desired, while the ammonium concentrations vary largely in different body fluids. Besides, the sensing reliability based on ion-selective biosensors can be significantly interfered by potassium ions.
View Article and Find Full Text PDFTherapeutic drug monitoring of methotrexate by disposable SPCE biosensor for personalized medicine.
Anal Chim Acta
January 2025
Department of Pharmacy, The First Affiliated Hospital, Fujian Medical University, Fuzhou, 350005, China; Department of Pharmacy, National Regional Medical Center, Binhai Campus of the First Affiliated Hospital, Fujian Medical University, Fuzhou, 350212, China. Electronic address:
Background: Methotrexate (MTX) is widely used in clinical practice for the treatment of malignant tumors and autoimmune diseases. High-dose MTX has been shown to be an effective approach for treating various malignant tumors, but it is accompanied by numerous toxic side effects, necessitating therapeutic drug monitoring (TDM) for patients and timely "folinic acid rescue." High-performance liquid chromatography and fluorescent immunoassay (FIA) are currently used to detect MTX, but these methods are limited by complex sample preparation, time consumption, and high cost.
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