scholarly journals programmed-pressure chromatography (pressure programming)

2008 ◽  
Keyword(s):  
Pressure Programming

Rapid Liquid-Chromatographic Separation of Steroids on Columns Heavily Loaded with Stationary Phase

1971 ◽  
Vol 17 (8) ◽  
pp. 757-764 ◽  
Author(s):  
Barry L Karger ◽  
Laverne V Berry
Keyword(s):  
Stationary Phase ◽  
Separation Efficiency ◽  
Particle Diameter ◽  
Solid Support ◽  
Support Material ◽  
Good Efficiency ◽  
Stationary Liquid Phase ◽  
Liquid Chromatographic Separation ◽  
Liquid Chromatographic ◽  
Pressure Programming

Abstract Properties of heavily loaded columns are illustrated, especially as applied to steroid separation. By "heavily loaded" we mean that the column contains an amount of stationary phase such that the pores of the solid support are essentially filled. The solid support can be loaded with as much as 35-50% by weight of stationary liquid phase, depending on the pore volume and the activity of the solid support. Using heptane/dioxane/formamide, we studied several heavily loaded columns with different liquid loadings and solid support particles of various diameters. Porasil C (10-25 µm particle size) gave markedly improved speed and efficiency characteristics over Porasil A (44-53 µm). A separation efficiency as great as 2.5 effective plates per second was achieved with support material having the smaller particle diameter. Qualitative reasons for this good efficiency are discussed. Column efficiency was independent of quantity (from 1 µg to 1 mg) of injected steroid sample. Finally, applicability of heavily loaded columns to separation of steroids is illustrated. With stepwise pressure programming, 10 steroids can be separated in 35 min.

Pressure Programming in Gas Chromatography

1969 ◽  
Vol 7 (2) ◽  
pp. 117-121 ◽  
Author(s):  
J. D. Kelley ◽  
J. Q. Walker
Keyword(s):  
Gas Chromatography ◽  
Pressure Programming

Evidence of Infant Blood Pressure Programming by Maternal Nutrition during Pregnancy: A Prospective Randomized Controlled Intervention Study

2008 ◽  
Vol 152 (1) ◽  
pp. 79-84.e2 ◽  
Author(s):  
Jonna Aaltonen ◽  
Tiina Ojala ◽  
Kirsi Laitinen ◽  
Tarja Johanna Piirainen ◽  
Tuija Annika Poussa ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Intervention Study ◽  
Maternal Nutrition ◽  
Randomized Controlled ◽  
Pressure Programming

Evidence of Infant Blood Pressure Programming by Maternal Nutrition During Pregnancy: A Prospective Randomized Controlled Intervention Study

2008 ◽  
Vol 63 (5) ◽  
pp. 297-299
Author(s):  
Jonna Aaltonen ◽  
Tina Ojala ◽  
Kirsi Laitinen ◽  
Taria Johanna Piirainen ◽  
Tuija Annika Poussa ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Intervention Study ◽  
Maternal Nutrition ◽  
Randomized Controlled ◽  
Pressure Programming
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