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.
Youssef M.S.K., 1979: Preparative scale directed resolution of enantiomeric carboxylic acids and lactones via liquid chromatography and neighboring group assisted hydrolysis of dia stereomeric amides. Angewandte Chemie International Edition In English: 63-65 The diastereomeric amides with Oh groups located in the.gamma. or.delta. position to the carbonyl group show high, in certain cases extreme separation factors [...]
Greenberg R.N., 1985: Preparative purification of escherichia coli heat stable enterotoxin. Analytical Biochemistry: 431-437 Heat-stable enterotoxin (STa) isolated from bovine Escherichia coli strains was purified to homogeneity by growing the bacterial strains in a chemically defined medium, desalting, and concentrating the culture filtrate by batch adsorption chromatography on Amberlite Xad-2 resin, batch adsorption chromatography on [...]
Danho W., 1981: Preparative oxidative conversion of protected peptide c alpha hydrazides into the corresponding acids by n bromo succinimide. International Journal Of Peptide & Protein Research: 6-11 A procedure for the preparative, oxidative conversion of protected peptide hydrazides into the corresponding acids by N-bromosuccinimide is described. Purification was achieved by high performance liquid chromatography [...]
Sticher O., 1986: Preparative on line overpressure layer chromatography oplc a new separation technique for natural products. Journal Of Natural Products (lloydia): 885-891 Overpressure layer chromatography (oplc) is further developed for the on-line preparative isolation of natural compounds. It use is demonstrated for the rapid isolation of one or two compounds in less than 1 [...]
Unger S., 1986: Preparative liquid chromatography of pharmaceuticals using silica gel with aqueous eluents. Journal Of Liquid Chromatography: 141-156 Acidic, basic, and neutral pharmaceuticals can be easily assayed on silica with aqueous eluents. Because of the nature of these packings, chromatographic methods are more reproducible than bonded phase packings and can be easily scaled up [...]
Doner L.W., 1987: Preparative liquid chromatography of carbohydrates monosaccharides and disaccharides uronic acids and related derivatives. Carbohydrate Research: 33-46 The general principles and practical aspects of preparative high-performance liquid chromatography (l.c.) of mono- and di-saccharides, sugars acids, lactones, and N-acetylated amino sugar derivatives are described. Milligram to gram quantities of these carbohydrates were isolated on [...]
Hassam S.B., 1985: Preparative isolation of uniformly carbon 14 labeled solanesol from carbon 14 dioxide chamber grown tobacco. Journal Of Labelled Compounds & Radiopharmaceuticals: 1261-1272 A method for the preparative isolation of solanesol from 14co2-chamber grown tobacco is described. Freeze-dried tobacco leaves were Soxhlet extracted with methylene chloride. Fractionation of the extract by silica gel [...]
Shieh C.H., 1986: Preparative hydrophobic interaction chromatography of proteins using ether based chemically bonded phases. Journal Of Liquid Chromatography: 3269-3296 This paper examines the use of 15-20 micron wide-pore silica-based ether bonded phases for the preparative hydrophobic interaction chromatography of proteins. In particular, silyl ehters are immobilized on large particle silica in an analogous manner [...]
Sondey S.M., 1987: Preparative high performance liquid chromatography of malto oligosaccharides. Journal Of Chromatography: 183-194 New preparative high-performance liquid chromatographic techniques that allow the practical isolation of milligram to gram quantities of malto-oligosaccharides from starch hydrolysates are described. High-resolution fractionations were achieved on preparative (.apprxeq. 30.times. 2.0 cm) columns packed with either (i) H+-form cation-exchange [...]
Matlin, S. A.; Chan, L., 1985: Preparative high performance liquid chromatography purification of beta lactam derivatives using laboratory assembled equipment. Journal of High Resolution Chromatography and Chromatography Communications 8(1): 23-27 The capabilities of a preparative chromatograph assembled at moderate cost from commercially available components are examined in relation to the purification of.beta.-lactam derivatives. High efficiency [...]