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Cu@DPP-SPION: A Novel and Versatile Catalyst for the Synthesis of Thioxo-Tetrahydropyrimidine Derivatives under Mild Reaction Conditions.
Curr Org Synth
January 2025
Stem Cells Technology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran.
Introduction: The development of efficient and sustainable catalytic methodolo-gies has garnered considerable attention in contemporary organic synthesis.
Methods: Herein, we present a novel approach employing the Cu@DPP-SPION catalyst for the synthesis of ethyl 4-(aryl)-6-methyl-2-thioxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate derivatives. This versatile catalytic system incorporates copper nanoparticles supported on 4-(1H-imidazo[4,5-f][1,10]phenanthrolin-2-yl)benzoic acid-functionalized superparamagnetic iron oxide nanoparticles (SPIONs).
Comparison of physico-chemical properties of different types of orthopedic acrylic cement.
J Biomater Sci Polym Ed
January 2025
Novel Drug Delivery Systems Laboratory, Faculty of Pharmacy, Medical Sciences/University of Tehran, Tehran, Iran.
Analyzing the chemical composition of different kinds of acrylic cement is necessary to understand their properties and suitability for curing bone defects. Conducting various chemical tests can give valuable insight into the composition, viscosity, and performance characteristics of each kind of cement, Therefore, our study aimed to find safety standards and the effectiveness of these products for medical applications. The polymeric characterization was determined by Nuclear Magnetic Resonance (H-NMR) spectroscopy and Fourier-transform infrared spectroscopy (FTIR).
View Article and Find Full Text PDFA recent overview of the application of emerging extraction medium-based sample preparation for the determination of aflatoxins and their precursors in food samples.
J Chromatogr A
January 2025
School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou, 450001, China; Henan Key Laboratory of Cereal and Oil Food Safety and Nutrition, Zhengzhou, 450001, China. Electronic address:
Food safety problem caused by aflatoxins (AFs) has become a major concern worldwide. However, due to the complexity of food matrices and the low concentration of analytes, the accurate and sensitive determination of AFs and their precursors in the biosynthetic pathway is extremely challenging, so the development of efficient sample preparation techniques has been urgently required. This paper reviews the recent advances in sample preparation based on some emerging extraction media for the determination of AFs and their precursors in different food samples, including ionic liquids (ILs) and IL-based composites, metal-organic frameworks (MOFs) and covalent organic frameworks (COFs).
View Article and Find Full Text PDFCharacterizing the microstructural transition at the gray matter-white matter interface: Implementation and demonstration of age-associated differences.
Neuroimage
January 2025
Department of Radiology, Columbia University Irving Medical Center, New York, NY, United States; Department of Biomedical Engineering, Columbia University, New York, NY, United States. Electronic address:
Background: The cortical gray matter-white matter interface (GWI) is a natural transition zone where the composition of brain tissue abruptly changes and is a location for pathologic change in brain disorders. While diffusion magnetic resonance imaging (dMRI) is a reliable and well-established technique to characterize brain microstructure, the GWI is difficult to assess with dMRI due to partial volume effects and is normally excluded from such studies.
Methods: In this study, we introduce an approach to characterize the dMRI microstructural profile across the GWI and to assess the sharpness of the microstructural transition from cortical gray matter (GM) to white matter (WM).
Enhanced Efficiency of Anionic Guerbet-Type Amino Acid Surfactants.
Langmuir
January 2025
Research Focus Area for Chemical Resource Beneficiation, Catalysis and Synthesis Research Group, North-West University, 11 Hoffman Street, Potchefstroom 2522, South Africa.
This study investigates the surfactant properties and efficiency of linear and Guerbet-type amino acid surfactants. Utilizing a Wilhelmy plate method, we assessed the colloidal efficiency of these surfactants, with the lowest observed critical micelle concentration at 0.046 mmol L, significantly reducing surface tension to as low as 25.
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