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Development and validation of a high-performance liquid chromatography method with fluorescence detection for the quantification of the resistance protein P-gp in cancer cells.
J Chromatogr B Analyt Technol Biomed Life Sci
January 2025
Université Clermont Auvergne, Institut Universitaire de Technologie, UMR INSERM-UCA, U1240, Imagerie Moléculaire et Stratégies Théranostiques (IMoST), 5 Avenue Blaise Pascal, 63000 Clermont-Ferrand, France.
A method using high-performance liquid chromatography coupled with fluorescence detection (HPLC-FLD) was developed and validated to quantify the innovative tool LightSpot®-FL-1, a selective permeability-glycoprotein (P-gp)-targeted fluorescent conjugate used to measure P-gp expression in cell samples. Quantifying P-gp is a major challenge in oncology as its overexpression in many cancer cells results in Multidrug Resistance (MDR) associated with chemotherapy failure. To develop the method reported herein, both sample preparation and analysis parameters were investigated.
View Article and Find Full Text PDFOptimization and Validation of an Ultra-Performance Liquid Chromatography with Quadrupole Detector Mass Spectrometry Quantification Method for the Simultaneous Detection of Tazarotene and Tazarotenic Acid in Porcine Skin: An In Vitro Study.
Int J Mol Sci
January 2025
Faculty of Pharmaceutical Sciences, University of Iceland, 107 Reykjavik, Iceland.
Exploring tazarotene, a third-generation retinoid for potential hand osteoarthritis treatment, this study presents the development and validation of an ultra-performance liquid chromatography with quadrupole detector mass spectrometry (UPLC-QDa) method for the simultaneous quantification of tazarotene and tazarotenic acid, its active metabolite, in porcine skin. Method development involved a design-of-experiments approach for chromatographic optimization of gradient steepness, organic solvent volume, column temperature, capillary voltage, flow rate, and cone voltage. Central composite orthogonal design was used to optimize peak area, peak width, retention time, and resolution.
View Article and Find Full Text PDFDual surrogate imprinting: an innovative strategy for the preparation of virus-selective particles.
Mater Horiz
January 2025
Institute of Analytical and Bioanalytical Chemistry, Ulm University, 89081, Ulm, Germany.
This work involves the preparation of dual surrogate-imprinted polymers (D-MIPs) for the capture of SARS-CoV-2. To achieve this goal, an innovative and novel dual imprinting approach using carboxylated-polystyrene (PS-COOH) nanoparticles with a diameter of 100 nm and a SARS-CoV-2 Spike-derived peptide was carried out at the surface of amine-functionalized silica (PS-NH) microspheres with a diameter of 500 nm. Firstly, PS-COOH nanoparticles with the same size and spherical shape as the SARS-CoV-2 virus were employed to form hemispherical indentations (HI) at the surface of the PS-NH microspheres (obtaining dummy particle-imprinted polymers, HI-MIPs).
View Article and Find Full Text PDFInnovative Infrared Spectroscopic Technologies for the Prediction of Deoxynivalenol in Wheat.
ACS Food Sci Technol
January 2025
Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, Ulm 89075, Germany.
Mycotoxin contamination in cereals is a global food safety concern. One of the most common mycotoxins in grains is deoxynivalenol (DON), a secondary metabolite produced by the fungi and . Exposure to DON can lead to adverse health effects in both humans and animals including vomiting, dizziness, and fever.
View Article and Find Full Text PDFDevelopment and validation of a UHPLC-MS/MS method for the quantitative analysis of trans-ISRIB in human plasma.
J Chromatogr B Analyt Technol Biomed Life Sci
January 2025
Department of Chemistry, Cleveland State University, Cleveland, OH 44115, USA. Electronic address:
The integrated stress response (ISR) is a cellular defense mechanism activated under stress conditions. When the ISR is activated, it slows the production of proteins, the building blocks that cells need to function. Trans-integrated stress response inhibitor (trans-ISRIB) is a compound that can reverse the effects of ISR activation, showing promise for treating neurodegenerative diseases.
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