The Experts below are selected from a list of 165 Experts worldwide ranked by ideXlab platform
Toshio Ogawa - One of the best experts on this subject based on the ideXlab platform.
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Determination of molecular weight distribution of nylon 12 by Gel Permeation Chromatography
Journal of Polymer Science Part A, 2003Co-Authors: Toshio Ogawa, Masakazu Sakai, Wataru IshitobiAbstract:Molecular weight distribution of Nylon 12 was determined with hexafluoroisopropanol/toluene mixture as eluent by Gel Permeation Chromatography. Calibration curve for Nylon 12 was easily obtained from that of polystyrene because the method of universal calibration was applicable among these polymers. The molecular weight distributions of Nylon 12 were always broader than expected by the theory of polymerization, i.e., most probable distribution. This result was not caused by broadening effect in Gel Permeation Chromatography, but by polymerization itself.
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Gel Permeation Chromatography of Polyoxymethylene
Journal of Liquid Chromatography & Related Technologies, 1990Co-Authors: Toshio OgawaAbstract:Abstract The method of universal calibration was applied for polyoxymethylene in Gel Permeation Chromatography. Successful molecular weight distribution curves were obtained for polyoxymethylene from chromatograms. Further, the weight average molecular weights from Gel Permeation Chromatography were in good agreement with those from light scattering.
A. Lambert - One of the best experts on this subject based on the ideXlab platform.
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Review of Gel Permeation Chromatography
British Polymer Journal, 2006Co-Authors: A. LambertAbstract:Gel Permeation Chromatography (g.p.c.) with organic solvents is of immense value in the characterisation of plastics and resins. Topics reviewed here are column packings and packing techniques, instrumental features, theories of the separating process and of instrumental dispersion, the use of g.p.c. to measure molecular size and hydrogen bonding, the applications of g.p.c. to low molecular weight polymers, applications to high molecular weight polymers, work on glass beads (as opposed to organic beads) and high resolution g.p.c.
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Rationalised sizes of small molecules in Gel Permeation Chromatography
Analytica Chimica Acta, 2001Co-Authors: A. LambertAbstract:Abstract 680 independent observations of the elution behaviour of small molecules in Gel Permeation Chromatography have been examined to see if reliable molar volumes can be calculated from them. For 380 observations this is possible, but for the other 300 it is not, mainly because the materials eluted outside the range of the calibration standards used in the appropriate work. The 380 reliable molar volumes are tabulated and the effects of the solvent are discussed.
Zhao Zi-gang - One of the best experts on this subject based on the ideXlab platform.
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Application of Gel Permeation Chromatography in detecting pesticide residue
Science and Technology of Cereals oils and Foods, 2010Co-Authors: Zhao Zi-gangAbstract:The principle and application of Gel Permeation Chromatography(GPC) on analyzing pesticide residue in grain,fruits,vegetables,food and other materials were summarized.The application prospect of preparing the sample for analyzing pesticide residue by GPC was studied.
S.-s.a. Pavlova - One of the best experts on this subject based on the ideXlab platform.
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Method of investigation Study of molecular weight distribution of polyarylates by Gel-Permeation Chromatography and fractionation☆
Polymer Science U.s.s.r., 2003Co-Authors: Inesa V. Blagodatskikh, Ye.a. Gladkova, L.v. Dubrovina, A.a. Karapet'yan, S.-s.a. PavlovaAbstract:Gel-Permeation Chromatography and fractionation by distribution between two liquid phases were used to invdstigate the molecular weight distributions of four polyarylate samples based on phenolphthalein and terephthalic acid chloride. Gel-Permeation Chromatography was carried out using a KhZh-1302 device with StyroGel columns packed by methods proposed in this study. It was shown that fractionation gives a lower coefficient of polydispersion than the method of Gel-Permeation Chromatography. Bimodal distribution was obtained for three samples by Gel-Permeation Chromatography. Proposals were put forward concerning possible causes of this molecular weight distribution.
Alan W Taylor - One of the best experts on this subject based on the ideXlab platform.
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Analysis of proanthocyanidins by high-performance Gel Permeation Chromatography.
Journal of chromatography. A, 2003Co-Authors: James A Kennedy, Alan W TaylorAbstract:A high-performance Gel Permeation Chromatography method was developed for the analysis of proanthocyanidins. The isocratic method consisted of two porous polystyrene-divinylbenzene columns (300 x 7.5 mm each, 5 microm, 100 and 500 A individual pore size) and a mobile phase consisting of N,N-dimethylformamide containing 1% (v/v) acetic acid, 5% (v/v) water and 0.15 M lithium chloride. The flow-rate was maintained at 1 ml/min, with a column temperature of 60 degrees C and with detection at 280 nm. The method was used to analyze proanthocyanidin fractions of increasing molecular mass and from different plant tissues. The average molecular mass of proanthocyanidin fractions as determined by acid catalysis in the presence of phloroglucinol, related well with their Gel Permeation Chromatography column retention, yet significant differences in the retention properties between individual plant tissue isolates existed. Proanthocyanidin compositional differences between isolates may explain these differences. A second-order calibration curve was generated from fractionated grape seed proanthocyanidins and this curve was used to analyze grape seed proanthocyanidins isolated from grapes harvested at extremes of maturity.
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Analysis of proanthocyanidins by high-performance Gel Permeation Chromatography.
Journal of Chromatography A, 2003Co-Authors: James A Kennedy, Alan W TaylorAbstract:Abstract A high-performance Gel Permeation Chromatography method was developed for the analysis of proanthocyanidins. The isocratic method consisted of two porous polystyrene–divinylbenzene columns (300×7.5 mm each, 5 μm, 100 and 500 A individual pore size) and a mobile phase consisting of N,N-dimethylformamide containing 1% (v/v) acetic acid, 5% (v/v) water and 0.15 M lithium chloride. The flow-rate was maintained at 1 ml/min, with a column temperature of 60 °C and with detection at 280 nm. The method was used to analyze proanthocyanidin fractions of increasing molecular mass and from different plant tissues. The average molecular mass of proanthocyanidin fractions as determined by acid catalysis in the presence of phloroglucinol, related well with their Gel Permeation Chromatography column retention, yet significant differences in the retention properties between individual plant tissue isolates existed. Proanthocyanidin compositional differences between isolates may explain these differences. A second-order calibration curve was generated from fractionated grape seed proanthocyanidins and this curve was used to analyze grape seed proanthocyanidins isolated from grapes harvested at extremes of maturity.
