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361.
Ard van Veelen Robin van Geel Yvo de Beer Anne-Marie Dingemans Leo Stolk Rob ter Heine Frank de Vries Sander Croes 《Biomedical chromatography : BMC》2020,34(4):e4771
A new method for quantification of osimertinib (OSIM) in human plasma using a high-performance liquid chromatography–tandem mass spectrometry method was developed and validated. Methanol was used for protein precipitation and pazopanib as internal standard. Separation was performed on a HyPURITY®C18 analytical column (50 × 2.1 mm; 3 μm) using a gradient elution of ammonium acetate in water and ammonium acetate in methanol, both acidified with formic acid 0.1%. Detection and quantification of OSIM and pazopanib was performed using a triple quadruple mass spectrometer after electrospray ionization. This method led to robust results, as the selectivity, carryover, precision and accuracy all met pre-specified requirements. OSIM was stable in human serum when stored at −80°C. Reduced stability was found when stored at 2–4°C or room temperature. Degradation of OSIM slowed down in EDTA–plasma and acidified human serum. The limited stability of OSIM at room temperature should be considered for transport and sample preparation. Plasma samples should be frozen as soon as possible and sample preparation should be performed on dry-ice. In the future, EDTA–plasma and sample acidification may be used to improve OSIM stability at room temperature. However, more research and validation of such an approach are required. 相似文献
362.
Anne-Marie Hecht Ferenc Horkay Simon Mallam Erik Geissler 《Macromolecular Symposia》1993,76(1):103-112
Small angle elastic neutron scattering was performed on three polystyrene networks swollen to equilibrium in cyclohexane at the theta temperature. Comparison of the SANS spectra with similar measurements in uncross-linked solutions reveals that in the intermediate Q region the gels behave like solutions of lower concentration than the equivalent solutions. We assume that the gel spectra are composed of a static component plus a dynamic, or solution-like part. By a suitable fitting procedure, the former can be estimated, yielding the mean square static concentration fluctuation <Δφ2> generated by cross-linking contraints in the gel. Independent measurement of the swelling pressure of these gels permits an estimate to be made of the scattering intensity I(Q=0) of the dynamic part of the spectrum. Plausible agreement is found between the macroscopic and microscopic estimations of the osmotic compressibility if allowance is made for the concentration polydispersity in the gels. 相似文献
363.
The microstructure and rheological behaviour of inhomogeneous biopolymer gels was studied using a model system of β-lactoglobulin. It can form both fine-stranded and particulate gels which can be homogeneous or inhomogeneous depending on pH and heating rate. The dense and loose regions of the fine-stranded gels had different relaxation times which significantly influenced the mechanical spectrum. The particulate gels showed coarser inhomogeneities influencing the fracture properties of the gels. 相似文献
364.
Raymond Kraemer Christophe Galliot Joëlle Mitjaville Anne-Marie Caminade Jean Pierre Majoral 《Heteroatom Chemistry》1996,7(2):149-154
Hexamethylhydrazinocyclotriphosphazene N3P3 (NMe-NH2)6 1 is a useful precursor for the synthesis of functionalized hexahydrazones ( 3a-f ), multicyclic ( 5 ) and multimacrocyclic ( 7 ) species, and small dendrimers ( 8 and 10 ). © 1996 John Wiley & Sons, Inc. 相似文献
365.
366.
Erik Geissler Anne-Marie Hecht Armel Guillermo Ferenc Horkay Jean Franois Legrand Simon Mallam 《Macromolecular Symposia》1993,76(1):163-174
Measurements of swelling pressure, neutron spin-echo scattering, and dynamic light scattering were made in an end-linked poly(dimethylsiloxane) (PDMS) gel swollen to equilibrium in a good solvent (toluene) and also in the equivalent solution. The macroscopic osmotic modulus is depressed in the gel. Neutron spin echo observations at intermediate and high values of the scattering vector Q reveal that the mobility of the monomers is unaffected by cross-linking. Elastic neutron scattering at small Q detects non-uniformities in the polymer concentration distribution, which are absent from the solution. These non-uniformities play a major role in the dynamic response of the system at lower Q, and and appear to be the cause of the observed reduction in osmotic pressure. 相似文献
367.
Ferenc Horkay Peter J. Basser Anne-Marie Hecht Erik Geissler 《Macromolecular Symposia》2003,200(1):21-30
The osmotic properties and the small angle neutron scattering (SANS) behaviour of fully neutralized sodium polyacrylate gels are investigated in the presence of calcium ions. Analysis of the SANS response displays three characteristic length scales, two of which are of thermodynamic origin, while the third, associated with the frozen-in structural inhomogeneities, is static. The SANS results are consistent with direct osmotic observations which indicate that the thermodynamic properties cannot be adequately described by a single correlation length. The concentration dependence of the osmotic pressure displays a power law behaviour with an exponent that decreases with increasing calcium concentration. 相似文献
368.
Isabelle Morfin Ferenc Horkay Peter J. Basser Françoise Bley Françoise Ehrburger-Dolle Anne-Marie Hecht Cyrille Rochas Erik Geissler 《Macromolecular Symposia》2003,200(1):227-234
Anomalous small angle X-ray scattering is used to determine the distribution of divalent ions in a neutralized polyelectrolyte gel of sodium polyacrylate in the vicinity of the volume transition. At the five different energies of the incident beam used to vary the contrast, the scattering curves have similar shapes, and are separated only by constant multiplying factors. This result, in conjunction with SANS results from the same sample, indicates that the divalent ion (strontium) is confined on the polymer backbone. 相似文献