Results 1 to 10 of about 89 (79)

Optimization and validation of a liquid chromatography/tandem mass spectrometry (LC-MS/MS) method for the determination of aflatoxins in maize [PDF]

Heliyon, 2019
A LC-MS/MS method has been optimized and validated for the determination of aflatoxins (AFB1, AFB2, AFG1 and AFG2) in maize. Extraction was performed using a modified QuEChERS method with little sample preparation without the need for purification ...
Abdallah Ouakhssase, Adil Chahid, Hanane Choubbane, Abdelmajid Aitmazirt, Elhabib Ait Addi   +4 more
doaj   +2 more sources

Crystal structure of diaqua[5,10,15,20-tetrakis(4-bromophenyl)porphyrinato-κ4N]magnesium [PDF]

Acta Crystallographica Section E: Crystallographic Communications, 2015
The title compound, [Mg(C44H24Br4N4)(H2O)2] or [Mg(TBrPP)(H2O)2], where TBrPP is the 5,10,15,20-tetrakis(4-bromophenyl)porphyrinato ligand, was obtained unintentionally as a by-product of the reaction of the [Mg(TBrPP)] complex with an excess of ...
Nesrine Amiri, Soumaya Nasri, Thierry Roisnel, Gérard Simonneaux, Habib Nasri   +4 more
doaj   +2 more sources

Structural and Durability Investigation of the Vitreous Part of the System (35-z)Na2O-zFe2O3-5Al2O3-60P2O5

Eurasian Chemico-Technological Journal, 2008
The glass compositions isolated within the system (35-z)Na2O-zFe2O3-5Al2O3-60P2O5 (5 ≤ z ≤ 20), were found to belong to the domains of metaphosphate (z = 5) and oligo-phosphate (5 < z ≤ 20) families.
Said Aqdim, El Hassan Sayouty, Brahim Elouadi   +2 more
doaj   +1 more source

Co-detection of eugenol and butylated hydroxyltoluene by green and selective hydrodistillation of Heliotropium europaeum L. using ionic liquids as additives [PDF]

Journal of the Serbian Chemical Society
This study is the beginning of the research that focuses on unconventional ionic liquids (ILs) hydrodistillation (HD) extraction of the essential oil of Heliotropium europaeum L. using ILs as additives.
Bendjelloul Sara, Bendeddouche Choukry Kamel, Bendeddouche Souhila, Sarri Madani, Bensafiddine Feriha, Kambouche Nadia, Paquin Ludovic, Yousfi Mohamed, Harrat Mohamed   +8 more
doaj   +1 more source

Up to 16% Optical Carbon‐13 Hyperpolarization of Donor–Acceptor Molecules at 14.1 T

Angewandte Chemie, EarlyView.
Up to 16% 13C nuclear polarization is achieved using a rationally designed photo‐CIDNP polarizing agent (PA) in magic‐angle‐spinning NMR experiments at 14.1 T. The PA was designed using a combination of theoretical photocycle calculations and magnetic field dependent experiments to identify important new design principles.
Marcel Levien, Máté Visegrádi, Ganesan Karthikeyan, Gilles Casano, Christian Reiter, Sebastian Wegner, Armin Purea, Michael R. Wasielewski, Federico De Biasi, Olivier Ouari, Lyndon Emsley   +10 more
wiley   +2 more sources

Modulating the Swelling Behavior of Polymer Brushes via Interfacial Chemistry

Angewandte Chemie, Volume 138, Issue 29, 13 July 2026.
Modulating substrate surface chemistry of surface‐grafted polymer brushes via variation of the chemical composition of spacers that anchor initiators for surface‐initiated atom transfer polymerizations allows to tune swelling of these thin polymer films.
Kuljeet Kaur, Sabrina Sant, Leon A. Smook, Sissi de Beer, Harm‐Anton Klok   +4 more
wiley   +2 more sources

Speciation, Structural Refinement, and Distribution of Ti Sites in Titanium Silicalite‐1 From 47/49Ti NMR Crystallography at 28.2 Tesla

Angewandte Chemie, Volume 138, Issue 15, 6 April 2026.
Titanium silicalite‐1 (TS‐1), used in industrial selective oxidation processes, depends on specific, yet still unresolved Ti sites, dispersed within the framework of an MFI‐zeolite. Applying high field (28.2 T) 47/49Ti NMR and 17O NMR spectroscopy for an array of TS‐1 catalysts enables the development of an NMR crystallography protocol and the ...
Christoph J. Kaul, Jonas Koppe, Lukas Lätsch, Michael Wörle, Sadig Aghazada, Jacob B. Holmes, Christina Wartmann, Mingji Zheng, Albrecht Berkessel, Trees De Baerdemaeker, Andrei‐Nicolae Parvulescu, Karsten Seidel, J. Henrique Teles, Alexander V. Yakimov, Christophe Copéret   +14 more
wiley   +2 more sources

Rapid Assignment of Chemical Shifts From Crystal Structures in Solid‐State NMR

Angewandte Chemie, Volume 138, Issue 14, 27 March 2026.
Chemical shift assignment in solids is a long and tedious process that relies on complex 1D and 2D NMR experiments. With prior knowledge of the 3D structure, this process can be significantly sped up by a Bayesian probabilistic assignment approach based on predicted chemical shifts.
Ruben Rodriguez‐Madrid, Jacob Brian Holmes, Lyndon Emsley   +2 more
wiley   +2 more sources

Interfacial Mn‐Carbon Nitride Synergy Enables Selective Photocatalytic C─H Chlorination via Single‐Atom Catalysis

Angewandte Chemie International Edition, EarlyView.
A manganese single‐atom photocatalyst on functionalised carbon nitride enables selective visible‐light‐driven C(sp2)─H chlorination. DFT‐supported mechanistic studies indicate that photoinduced charge separation activates NCS, while isolated Mn sites stabilize Mn─Cl intermediates at the catalyst interface.
Jaro Vanderghinste, Prakash Kumar Sahoo, Xinbang Wu, Thanh Huyen Vuong, Anna Rokicińska, Susanna Monti, Giovanni Barcaro, Alina Skorynina, Aleksander Jaworski, Vivien Michaelis, Jabor Rabeah, Julia Bornhorst, Laura Simonelli, Piotr Kuśtrowski, Adam Slabon, Paul J. Dyson, Shoubhik Das   +16 more
wiley   +1 more source

Enhancing NMR Signals in Liquids by Fluorine‐19 Overhauser Dynamic Nuclear Polarization (DNP) and Hyperpolarization Transfer to Carbon‐13

Angewandte Chemie, Volume 137, Issue 50, December 8, 2025.
Fluorine nuclear spins can be hyperpolarized in solution by Overhauser dynamic nuclear polarization from a paramagnetic agent like galvinoxyl. This hyperpolarization can be transferred by nuclear magnetic resonance (NMR) to nearby 13C, leading to 13C signal enhancements up to ∼100.
Maik Reinhard, Alex van der Ham, Luming Yang, Leonard Bröker, Tomas Orlando, Igor Tkach, Marcel Levien, Marina Bennati   +7 more
wiley   +2 more sources