21032
GC Stationary Phase
phase Carbowax 20M, bottle of 50 g
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About This Item
UNSPSC Code:
23151817
Productos recomendados
agency
meets requirements for USP G16
form
solid
packaging
bottle of 50 g
parameter
60-225 °C temp. range
technique(s)
gas chromatography (GC): suitable
matrix active group
Carbowax 20M phase
solubility
chloroform: soluble
McReynolds constant
17, 86, 48, 69, 56
column type
packed GC
General description
GC methods are divided into two classes depending on the nature of stationary phases; gas-solid chromatography (GSC) and gas-liquid chromatography (GLC). GSC has solid adsorptive material and solute particles are removed from mobile phase by electrostatic forces. GLC has a thin layer of liquid coated or bonded on the surface of an inert particle or on the walls of the column where solute particles are retained in the liquid phase based on their partition coefficients. The primary necessity of a stationary phase is to provide sample separation sustaining phase integrity over a reasonable period of time. It should be stable for the chemical and thermal changes. Selectivity, peak symmetry, analysis time, degree of separation, peak tailing are few parameters that should be considered before choosing a stationary phase. Carbowax 20M is a polar liquid phase suitable as stationary phase for gas chromatography. It consists of two units of (HC2-CH2O)600 with OH terminals connected through a hydrophobic portion. This structure of the polymer makes it suitable for being used as a solvent for polar molecules such as cyclodextrin derivatives. It exhibits good selectivity toward alcohols, diols and aromatic isomeric molecules.
Synthesized specifically to be purer, of narrow molecular weight range, and without trace catalysts or impurities for use as a GC stationary phase.
Application
Carbowax 20M may be used to test different relative amounts of crosslinking reagents by coating the inner wall of the capillary, to optimizing the capillary column performance.
Storage Class
11 - Combustible Solids
wgk_germany
WGK 3
flash_point_f
Not applicable
flash_point_c
Not applicable
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Encuentre la documentación para los productos que ha comprado recientemente en la Biblioteca de documentos.
Michael Gratzel
Energy Resour. Photochem. Catal. (M. Gratzel, ed.) (1983)
Jaiver Osorio Grisales et al.
Journal of chromatography. A, 1216(40), 6844-6851 (2009-09-01)
This paper reports the study of poly(oxyethylene) as a solvent for heptakis(2,3,6-tri-O-methyl)-beta-cyclodextrin (PM-beta-CD) and the potential of these mixtures for constructing enantioselective gas chromatography columns. Enantioseparations of volatile racemic mixtures using capillaries coated with 10-50% PM-beta-CD diluted in Carbowax 20M
George Charalambous
Chemistry of foods and beverages: Recent developments, 76-76 (1982)
Nuno I P Valente et al.
Sensors (Basel, Switzerland), 18(8) (2018-07-26)
Cheese prepared from whole milk, raw and pasteurized, were analysed by an electronic nose based on piezoelectric quartz crystals and an electronic tongue based on potentiometric sensors, immediately after their preparation and along ripening (after 7 and 21 days). Whey
James P. Lodge, Jr.
Methods of Air Sampling and Analysis, 98-98 (1988)
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