Models of SEC elution curves for binary and multi-component polymers

2008 ◽  
Vol 58 (2) ◽  
pp. 198-201 ◽  
Author(s):  
Miloš Netopilík ◽  
Pavel Kratochvíl
Keyword(s):  
Elution Curves

The (Least Squares) Quotient Algorithm as a Rapid Tool For Obtaining Sorption Isotherms From Column Elution Curves

1995 ◽  
Vol 31 (4) ◽  
pp. 849-857 ◽  
Author(s):  
M. van Veldhuizen ◽  
C. A. J. Appelo ◽  
J. Griffioen
Keyword(s):  
Least Squares ◽  
Sorption Isotherms ◽  
Elution Curves ◽  
Rapid Tool

Physico-Chemical Characterization of Alumina Sols Prepared From Aluminum Alcoxides

1986 ◽  
Vol 73 ◽  
Author(s):  
William L. Olson
Keyword(s):  
Room Temperature ◽  
Gel Filtration ◽  
Chemical Characterization ◽  
Process Conditions ◽  
Chemical Processing ◽  
Rotary Evaporation ◽  
Physico Chemical ◽  
Elution Curves ◽  
Alumina Sol

ABSTRACTAlumina sols derived from aluminum sec-butoxide (Yoldas) were characterized. The distribution of the polymer sizes within the sol, determined by gel filtration chromatography (GFC), was found to be dramatically affected by small changes in the chemical processing or preparative procedure. Aging the sol at room temperature for two weeks produced no significant change in the GFC elution curves of the alumina sol. Sols with a “milky” appearance were found to exhibit a wider distribution of polymers by GFC than transparent sols. Rotary evaporation of the sol followed by redissolution of the residue was found to change the polymer size distribution described by the gel filtration elution curves. These observations coupled with 27Al NMR spectroscopy and viscometry measurements were used to elucidate the effects of process conditions and aging on the molecular structure of the sol.

Role of the biotic compartment in the transfer of zinc through the vadose zone - application to an infiltration system

1999 ◽  
Vol 39 (2) ◽  
pp. 209-215
Author(s):  
C. Hébrard ◽  
C. Delolme
Keyword(s):  
Heavy Metals ◽  
Pseudomonas Putida ◽  
Vadose Zone ◽  
Considerable Importance ◽  
Urban Stormwater ◽  
Elution Curves ◽  
Stormwater Infiltration

Relatively little is known about the influence of microorganisms which develop in urban stormwater infiltration basins on the transfer of heavy metals, whereas many reports have emphasized their importance in the mechanisms of retention or solubilization of these elements. We therefore examined the transfer of zinc solutions (2-20 ppm) at different pH (4-7) by columns of sterile sand or sand colonized with Pseudomonas putida. The shape of the elution curves shows that the biofilm adsorbed zinc, causing its elution to be retarded. Adsorption seemed to be reversible, except at pH 6 and 7, and non-instantaneous. Consequently, the stormwater infiltration speed may be of considerable importance.

Sirolimus-Loaded Polyurethane Graft for Hemodialysis Access in Sheep

Vascular ◽  
2008 ◽  
Vol 16 (5) ◽  
pp. 269-274 ◽  
Author(s):  
Earl Schuman ◽  
Jayaraman Babu
Keyword(s):  
Intimal Hyperplasia ◽  
Measured Parameter ◽  
Hemodialysis Access ◽  
Ultrasound Evaluation ◽  
Coated Materials ◽  
Elution Curves ◽  
Table Analysis ◽  
Drug Eluting ◽  
Arteriovenous Grafts ◽  
Time Point

Intimal hyperplasia is the most common final pathway for hemoaccess occlusion in dialysis patients. Drug eluting stents have been shown to decrease intimal hyperplasia in coronary arteries and possibly in peripheral arteries. We evaluated the use of a sirolimus loaded polyurethane graft as prophylaxis in hemodialysis access. Grafts were loaded with sirolimus and elution curves were determined for the polyurethane material. The arteriovenous grafts were then placed in the neck of 20 sheep. A non-loaded graft was placed in the contralateral neck. Patency rates, ultrasound evaluation, angiography and histomorphometry were determined for each graft. At 30, 60 and 90 days the drug loaded graft had improved patency rates compared to the control, with a 25% improvement noted at 3 months. Life table analysis showed the drug loaded graft consistently better patency than the control (p = .136). The control graft had greater neointimal stenosis (14.5% vs 9.17%) over the course of the study (p = .157). Although none of these findings was statistically significant in this pilot study, the sirolimus coated graft out-performed the control in every measured parameter at each time point evaluated. Further work to asses the validity of drug coated materials to prevent intimal hyperplasia in hemodialysis access is warranted.

Practice of Chromatography: Deriving Isotherms from Elution Curves

1992 ◽  
Vol 56 (5) ◽  
pp. 1429-1437 ◽  
Author(s):  
J. Griffioen ◽  
C. A. J. Appelo ◽  
M. van Veldhuizen
Keyword(s):  
Elution Curves

Influence of sorption on the shape of chromatographic elution curves

1980 ◽  
Vol 198 (4) ◽  
pp. 377-388 ◽  
Author(s):  
G.V. Yeroshenkova ◽  
S.A. Volkov ◽  
K.I. Sakodynskii
Keyword(s):  
Elution Curves ◽  
Chromatographic Elution

Concentration Dependence of Elution Curves in Non-Ideal Gas Chromatography.

1966 ◽  
Vol 38 (4) ◽  
pp. 573-582 ◽  
Author(s):  
P. C. Haarhoff ◽  
H. J. Van der Linde
Keyword(s):  
Gas Chromatography ◽  
Concentration Dependence ◽  
Ideal Gas ◽  
Elution Curves
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