A silicate is a compound with an anion that bears a silicon molecule. Most of the silicates in existence are oxides, but hexafluorosilicate and other anions are also included. Silicates are a common—in fact, the major—component of the earth’s crust, as well as other planets with a terrestrial environment, asteroids, and rocky moons. Portland cement, sand, and thousands of other minerals can be called silicates. Silicate compounds (as well as silicate minerals) have silicate anions with charges balanced by a wide variety of cations. Myriad silicate anions can exist, with each having the ability to form compounds with a wide variety of different cations. This ability is the reason why the silicate class of compounds is relatively large compared to other compound classes. Natural and synthetic minerals can also fit in this class.
Silicate can also occur in solutions, even if they are well characterized as solids. The silicon-bearing anion is the essential conjugate base of silicic acid, and both are elusive, as are all the intermediate species. Solutions of silicates are typically observed as mixtures of condensed and partially protonated clusters of silicate. The properties of soluble silicates is very relevant to understanding the process of biomineralization and the synthesis of aluminosilicates, including catalysts called zeolites, which is important in various kinds of industries.
Sodium silicate is one of the known silicate compounds, which is also known as water glass or liquid glass. Sodium silicate can be found in aqueous solution and in solid form that is used in passive fire protection, refractories, the processing of textile and lumber, automobiles, and cements. Sodium silicate is also used in the process of chromatography.
This category contains scientific information on silicate, a compound with an anion that bears a silicon molecule that can be used for various applications, including chromatography.
Koehler J., 1986: Polyvinylpyrrolidone coated silica a versatile polar stationary phase for high performance liquid chromatography. Chromatographia: 573-582 Poly(vinylpyrrolidone) (Pvp) is immobilized on both, small- and large-pore silicas by thermal treatment,.gamma.-radiation, or peroxide initiated polymerization. The hydrolytic stability of such a highly polar stationary phase significantly exceeds that of a comparable phase prepared by the [...]
Mourey T.H., 1986: Polymer adsorption chromatography with evaporative light scattering detection. Journal Of Chromatography: 101-106 Poly(alkyl acrylate) and poly(alkyl methacrylate) homopolymers and copolymers are eluted from silica with toluene-2-butanone solvent gradients. The polymers are separated by liquid-solid adsorption chromatography according to their chemical composition and not by molecular weight. Evaporative light-scattering monitors polymers that may [...]
An J.G., 1988: Polyethylene glycol bonded phases for protein separation by high performance hydrophobic interaction chromatography. Chromatographia: 350-355 This paper further investigates the effects of silica base pore size and the molecular weight of polyethylene glycol (Peg) ligands on the coverage of Peg-bonded phases, as well as the resolution of protein separation in high-performance hydrophobic [...]
Beale S.I., 1987: Polyethylene based high performance liquid chromatography of chloroplast pigments resolution of mono and divinylchlorophyllides and other pigment mixtures. Analytical Biochemistry: 493-499 In addition to most chlorophylls and their derivatives, monovinyl and divinyl chlorophyll species were separated by high-performance liquid chromatography, using a polyethylene column and a simple elution with aqueous acetone. Peak [...]
Haraguchi K., 1985: Polychlorinated biphenyl isomers in the blood of recent yusho patients. Fukuoka Acta Medica: 150-152 The blood of Yusho patients sampled in 1983 and 1984 were analyzed for 7 poly chlorinated biphenyl (Pcb) isomers by gas chromatography with a fused-silica capillary column. The concentrations of 2, 4, 5, 3′, 4′-penta-Cb and 2, 3, [...]
Wong J.L., 1983: Poly vinyl acetate gel permeation chromatography of h coal chromatography liquids and model compounds comparison with rigid gel chromatography reversed phase chromatography and normal phase chromatography. Journal Of Liquid Chromatography: -1948 The application of polyvinylacetate gel (Fractogel) for size fractionation of the H-coal liquids and model aromatic hydrocarbons was reported. The 4 [...]
Devlaminck L., 1980: Poly chlorinated bi phenyl compounds in milk and dairy products. Zeitschrift Fuer Lebensmittel Untersuchung Und: 346-348 The Pcb content of 469 milk and dairy product samples was determined. The fat was extracted and cleaned up through aluminum oxide. The organochlorine pesticides and the Pcb were separated by chromatography through a silica gel [...]
Wachob G.D., 1987: Plasma sample cleanup for catecholamines analysis using weak cation exchange solid phase extraction. Journal Of Liquid Chromatography: 2429-2438 Norepinephrine and epinephrine were isolated from human plasma at picogram levels by solid phase extraction (Spe), on a proprietary weak cation exchange silica based packing. Plasma samples were spiked with catecholamines at two concentrations [...]
Reid T., 1980: Plasma levels of 8 methoxy psoralen determined by high pressure liquid chromatography in psoriatic patients ingesting drug from 2 manufacturers. Journal Of Investigative Dermatology: 59-62 A rapid and sensitive high-pressure liquid chromatographic technique (Hplc) was adapted to measure plasma levels of 8-methoxypsoralen (8-Mop) in 22 psoriatic patients receiving photochemotherapy with 8-Mop and [...]
Mantegazza P., 1983: Plasma beta endorphin beta lipotropin and methionine enkephalin concentrations during pregnancy in normal and drug addicted women and their new born. Journal Of Clinical Endocrinology & Metabolism: 537-543 Plasma.beta.-endorphin concentrations in pregnant women are highly elevated, possibly indicating a role for opiate peptides during pregnancy and in the fetus-mother relationship. Plasma.beta.-endorphin,.beta.-lipotropin and [...]