Results 191 to 200 of about 286,792 (241)
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Polymer, 1989
Virtually all synthetic polymers have a molecular weight distribution (MWD) which may be represented by the cumulative weight distribution I(M) or differential weight distribution w(M) as a function of molecular weight M.1 Although the calculation of w(M) for various types of polymerization mechanism was already well documented,2 an accurate and ...
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Virtually all synthetic polymers have a molecular weight distribution (MWD) which may be represented by the cumulative weight distribution I(M) or differential weight distribution w(M) as a function of molecular weight M.1 Although the calculation of w(M) for various types of polymerization mechanism was already well documented,2 an accurate and ...
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Journal of Chromatography A, 2002
Size-exclusion chromatography (SEC) and size-exclusion electrochromatography (SEEC) are chromatographic techniques used to determine molecular mass (weight) distributions (MWD) of polymers. One important step in the data treatment to derive MWD parameters is the modelling of the calibration curves.
van der Heijden, Y. +2 more
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Size-exclusion chromatography (SEC) and size-exclusion electrochromatography (SEEC) are chromatographic techniques used to determine molecular mass (weight) distributions (MWD) of polymers. One important step in the data treatment to derive MWD parameters is the modelling of the calibration curves.
van der Heijden, Y. +2 more
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Surfactant-aided size exclusion chromatography
Journal of Chromatography B, 2004The flexibility and selectivity of size exclusion chromatography (SEC) for protein purification can be modified by adding non-ionic micelle-forming surfactants to the mobile phase. The micelles exclude proteins from a liquid phase similar to the exclusion effect of the polymer fibers of the size exclusion resin.
Horneman, D.A. +5 more
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Size-exclusion chromatography of perfluorosulfonated ionomers
Journal of Chromatography A, 2011A size-exclusion chromatography (SEC) method in N,N-dimethylformamide containing 0.1 M LiNO(3) is shown to be suitable for the determination of molar mass distributions of three classes of perfluorosulfonated ionomers, including Nafion(®). Autoclaving sample preparation is optimized to prepare molecular solutions free of aggregates, and a solvent ...
T H, Mourey +3 more
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Poppe plots for size-exclusion chromatography
Journal of Chromatography A, 2005Poppe plots provide a clear and unambiguous way to discuss the performance limits of separation systems. The effects of particle size, pressure drop and column permeability can be illustrated using such plots. The performance limits of size-exclusion chromatography are of interest, due to developments in combinatorial chemistry and high-throughput ...
Popovici, S.T., Schoenmakers, P.J.
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Rapid size-exclusion chromatography of proteoglycans
Journal of Chromatography B: Biomedical Sciences and Applications, 1997The separation of intact proteoglycans using high-performance liquid chromatography is not trivial because the high molarity denaturing buffers required to maintain proteoglycans in the disaggregated state create back-pressures higher than the limits of many HPLC systems.
P Y, Johnson, D A, Blake
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Dichloropentafluoropropanes as solvents for size exclusion chromatography
Journal of Chromatography A, 2004We have found that HCFC225s (HCFC225ca: 3,3-dichloro-1,1,1,2,2-pentafluoropropane, HCFC225cb: 1,3-dichloro-1,1,2,2,3-pentafluoropropane) are superior mobile phases for size exclusion chromatography (SEC). As alternatives of CFC113, they have been shown to possess a number of excellent properties, such as low flammability, low viscosity, low cost, high ...
Tsuguhide, Isemura +2 more
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Fractionation of Zein by Size Exclusion Chromatography
Journal of Agricultural and Food Chemistry, 2007Zein is a group of alcohol-soluble corn proteins, which consists of several individual proteins. A single-step gel filtration chromatography method was developed to fractionate individual zeins from ethanol extracts of whole corn. A Superdex prep 75 column was used with different mobile phases to fractionate the zeins, which were analyzed by SDS-PAGE ...
Fangyi, Zhu +2 more
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Journal of Chromatography A, 2001
Band broadening in size-exclusion chromatography (SEC) has an adverse effect upon calculated molecular mass averages, distributions, and dilute solution data generated using single- and multi-detector systems. In the past, the longitudinal diffusion contribution to band broadening in SEC has been considered negligible.
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Band broadening in size-exclusion chromatography (SEC) has an adverse effect upon calculated molecular mass averages, distributions, and dilute solution data generated using single- and multi-detector systems. In the past, the longitudinal diffusion contribution to band broadening in SEC has been considered negligible.
openaire +2 more sources