Quantification studies in continuous-flow (super 13)C nuclear magnetic resonance spectroscopy by use of immobilized paramagnetic relaxation agents

Article Abstract:

The different types of immobilized free radicals as well as immobilized paramagnetic gadolinium (III) complexes are synthesized and used as relaxation agents to shorten the spin-lattice relaxation times T1 of the analytes in quantitative continuous-flow (Super 13)C nuclear magnetic resonance spectroscopy (NMR). With these types of paramagnetic relaxation agents, it is possible to obtain 4-fold increase in signal-to-noise ratio per unit time, and almost quantitative NMR spectra in continuous-flow NMR spectroscopy could be acquired with this method.

Usage, Nuclear magnetic resonance spectroscopy, Electron paramagnetic resonance spectroscopy

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Gd(III) polyaminocarboxylate chelate: Realistic many-body molecular dynamics simulations for molecular imaging applications

Article Abstract:

The realistic molecular dynamics simulations are used to obtain a realistic description of the structural and dynamical properties of a lanthanide ion complex with a carboxylate ligand and explicit water solvent at the same time. The results have provided information on the geometric arrangement of second coordination shell, as well as evidence for a strong charge transfer between the polyaminocarboxylate complexes of gadolinium (III) ion and its environment, especially the carboxylate ligand.

Nonferrous Metals NEC, Analysis, Molecular dynamics, Rare earth metals

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Pulse radiolytic studies of metallotexaphrins in the presence of oxygen: relevance of the equilibrium with superoxide anion to the mechanism of action

Article Abstract:

The gadolinium(III) complex of the expanded porphyrin macrocycle texaphyrin, metaxafin gadolinium (Gd-Tex2+) is currently in phase III US human trials as radiation sensitizer for the treatment of metastatic brain tumors. It was found that all four of these M-Tex2+ species set up an equilibrium with superoxide and the singly reduced TMQ (TMQ-) on the pulse radiolytic time scale.

Superoxide, Superoxides, Radiolysis

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