scholarly journals Chromatographic separation of allylic alcohols on silicic acid columns: Analysis of the nonsaponifiable lipids of an ascites tumor derived from a benzpyrene-induced sarcoma

1963 ◽  
Vol 4 (3) ◽  
pp. 266-269
Author(s):  
George J. Schroepfer ◽  
Irene Youhotsky Gore
Keyword(s):  
Silicic Acid ◽  
Chromatographic Separation ◽  
Allylic Alcohols ◽  
Ascites Tumor

Silicic Acid Chromatographic Separation of Polychlorinated Biphenyls and Pesticides: Some Contaminants and Limitations

1976 ◽  
Vol 59 (5) ◽  
pp. 975-981
Author(s):  
James N Huckins ◽  
David L Stalling ◽  
James L Johnson
Keyword(s):  
Polychlorinated Biphenyls ◽  
Silicic Acid ◽  
Chromatographic Separation ◽  
Liquid Chromatographic ◽  
Ethylhexyl Phthalate ◽  
Alternative Adsorbents

Abstract The Armour and Burke method for separating polychlorinated biphenyls (PCBs) from pesticides involves the use of silicic acid. However, we detected di-2-ethylhexyl phthalate, PCBs, and other impurities as interfering contaminants in several batches of silicic acid. The presence of H2SO4 in some batches of silicic acid is inferred. The acid may be responsible for the production of contaminants which interfere in gas-liquid chromatographic analyses. Contaminants in silicic acid are reduced by extracting the adsorbent with solvent, and/or partitioning the concentrated pesticide fraction with 1N NaOH. These purification procedures provide separations relatively free of impurities, but result in reduced adsorbent activity. PCB-pesticide separations are reproducible only within a given batch lot of silicic acid because of the varying adsorbent characteristics of each lot. Alternative adsorbents should be explored for most PCB-pesticide separations.

The Chromatographic Separation of Pesticides on Silicic Acid

1961 ◽  
Vol 44 (3) ◽  
pp. 606-608
Author(s):  
J P Barrette ◽  
R Payfer
Keyword(s):  
Silicic Acid ◽  
Chromatographic Separation

Notizen: Isolation of Beef Brain Phosphonolipids by Thin Layer Chromatography: Their Identification and Silicic Acid Column Chromatographic Separation

1986 ◽  
Vol 41 (3) ◽  
pp. 369-374 ◽  
Author(s):  
Michael C. Moschidis
Keyword(s):  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Silicic Acid ◽  
Chromatographic Separation ◽  
Silicic Acid Column ◽  
Preparative Thin Layer Chromatography ◽  
Isolation And Identification ◽  
Beef Brain ◽  
Layer Chromatography ◽  
Column Chromatographic

The isolation and identification of the phosphonolipids from beef brain - right lobe, left lobe and cerebellum - is herein reported. The phosphonolipids were isolated by preparative thin layer chromatography (TLC) using the solvent system methanol/water (2:1, v/v) and identified preliminarily by TLC. The isolated phosphonolipids were subjected to silicic acid column chromatographic separation and the thus separated phosphonolipids were identified by TLC, nitrogen-phosphorus determinations and IR spectroscopy.

Adsorption Chromatographic Separation of Chlorinated Hydrocarbons from Lipids

1974 ◽  
Vol 57 (2) ◽  
pp. 399-404
Author(s):  
Robert R Claeys ◽  
Roderick D Inman
Keyword(s):  
Reference Material ◽  
Silicic Acid ◽  
Chromatographic Separation ◽  
Unit Volume ◽  
Polar Solvent ◽  
Chlorinated Hydrocarbons ◽  
Elution Volume ◽  
Effects Of Temperature ◽  
Column Chromatographic ◽  
Temperature Water

Abstract Florisil, alumina, and silicic acid were compared for the column chromatographic separation of lipids from chlorinated hydrocarbons. Alumina had the largest capacity per unit volume to retain lipids and oils (0.7 g beef lipid/ 25 g alumina) while eluting dieldrin. Florisil had a larger capacity than silicic acid. Deactivation and elution with a nonpolar solvent gave superior separation over previously used polar solvent elution from activated adsorbents. The effects of temperature, water, and lipid load on the elution of dieldrin were studied. A yellow dye, p-methoxyazobenzene, was found to have a slightly larger elution volume than dieldrin, and is useful as a visible reference material for the elution of chlorinated hydrocarbons.

Chromatographic Separation of p-Phenylazophenacyl Esters on Silicic Acid

1954 ◽  
Vol 26 (7) ◽  
pp. 1228-1229 ◽  
Author(s):  
R.M. Ikeda ◽  
A. D. Webb ◽  
R. E. Kepner
Keyword(s):  
Silicic Acid ◽  
Chromatographic Separation

Characteristics Of The Structure Formation Of Gypsum Binder Modified With Zinc Hydrosilicates

2020 ◽  
pp. 40-46
Keyword(s):  
Synergistic Effect ◽  
Physicochemical Properties ◽  
Structure Formation ◽  
Silicic Acid ◽  
Chemical Properties ◽  
Crystal Formation ◽  
Ability To Act ◽  
Chemical Factors ◽  
Sorption Characteristics

The authors' methodic for assessing the role of chemical and physic-chemical factors during the structure formation of gypsum stone is presented in the article. The methodic is also makes it possible to reveal the synergistic effect and to determine the ranges of variation of controls factors that ensure maximum values of such effect. The effect of a micro-sized modifier based on zinc hydro-silicates on the structure formation of building gypsum is analyzed and corresponding dependencies are found. It is shown that effects of influence of modifier on the properties of gypsum compositions are determined by chemical properties of modifier. Among the mentioned properties are sorption characteristics (which depend on the amount of silicic acid and its state) and physicochemical properties - the ability to act as a substrate during crystal formation. The proposed method can also be extended to other binding substances and materials. This article contributes to the understanding of the processes that occur during the structure formation of composites, which will make it possible to control the structure formation in the future, obtaining materials with a given set of properties.

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