Capillary columns exhibit extremely high levels of separation performance in comparison with packed columns due to low levels of diffusion and good permeability of samples.
Fused silica capillary columns coated with polyimide resins on the outside were developed around 1980.
The inert surfaces and flexibility of fused silica tubing enabled high performance separations and easy handling. To satisfy your analytical requirements, we have a wide variety of columns including chemically bonded and wall coated types.
(Wall Coated Open Tubular)
|Material||Fused Silica||Deactivated Stainless
|Fused Silica||Stainless Steel|
|ULBON HR-TGC1||ULBON Advance-DS
ULBON Xylene Master
|ULBON Kel F Oil No.10
“ULBON” is the generic name for Shinwa capillary columns.
“ULBON HR” is the generic name for Shinwa capillary columns with chemically bonded layers.
|Chemically bonded layers||The ULBON HR series consists of capillary columns with stationary phases chemically bonded to silica surfaces.||Fused silica covered with polyimide resin|
|Deactivated stainless steel|
(Wall Coated Open Tubular)
|Capillary columns with stationary phases coated on inner walls.||Fused silica covered with polyimide resin|
Conventional packed columns consist of tubes with inner diameters of 2-4 mm and lengths of 0.5-6 m, and which are packed with supports comprised of stationary phases coated with liquid phases. With changes in analytical trends, many varieties of packed columns have been replaced with capillary columns. However, because gaseous samples occupy large volumes and easily diffuse at room temperature, there are still a large number of unfavorable factors preventing a complete switch to capillary columns, with the result that many analyses of these kinds of samples still rely on packed columns. The MICROPACKED ST column was developed to be used in the same manner as capillary columns, as well as provide increased sample loading capacities.
Supports hold stationary phases, and ideal supports are said to have no direct contribution to separations of samples. However, peak tailing and component decomposition sometimes occur due to the characteristics of a support. It is therefore necessary to choose an appropriate packing material for each analytical purpose.
|Shimalite®||Brown diatomaceous earth support for medium to high stationary phase concentrations|
|Shimalite® W||White diatomaceous support for low stationary phase concentrations|
|SHINCARBON A||High purity carbon support|
|Sunpak-A||Porous polymer beads|
|Shimalite® TPA||Terephthalic acid support for analyses of samples containing water|
|Shimalite® F||Fluororesin support|
|Shimalite® Q||Crystal support|
Shinwasorb is a completely new porous silica gas chromatography support which, while possessing characteristics similar to white diatomaceous earth supports including appearance, physical strength, and heat resistance, has done away with the problems common to diatomaceous earth supports.
Samples vaporized in sample injection ports are separated as a result of distribution equilibria between stationary and gaseous phases. There are many kinds of stationary phases ranging from non-polar (e.g., squalene) to polar (e.g., polyethyleneglycol). Samples and stationary phases that have similar polarities show strong affinities for each other with the result that samples are retained strongly on stationary phases. There are currently approximately 300 kinds of stationary phases for gas chromatography.
The characteristics required of GC stationary phases are shown below:
|Hydrocarbons||Paraffinic hydrocarbons||Apiezon L, squalane, hexatriacontane,
|Halogen compounds||Fluorine-containing oils||Kel F oil no. 3, halocarbon oil, Fluorolube HG1200|
|Oxygenated compounds||Monoesters||Dibutyl maleate (DBM),
dioctyl phthalate (DOP),
dioctyl sebacate (DOS),
dinonyl phthalate (DNP),
|Polyesters||FFAP, FON, Thermon-1000,
Thermon-3000, 1,4-BDS, DEGS,
DEGA, EGA, EGS, NGS, NGA
|Alcohols||Diglycerol, Hyprose SP-80,
|Ethers (including polyesters)||Polyphenyl ether,
|Polyglycols||Polyethylene glycols, Ucon oils|
|Nitrogen compounds||Amides||Poly-A series, Versamid 900|
|Nitro compounds, etc.||Alukaterge T, 4,4-azoxydianisol|
|Silicones||Methyl silicones||SE-30, DC-200, DC-11, DC-410, OV-1,
|Methyl phenyl silicones||SE-52, OV-17, OV-3, OV-22, DC-550, DC-710|
|Methyl phenyl vinyl silicone||SE-54|
|Trifluoropropyl silicones||QF-1, OV-210|
|Cyanoalkylmethyl silicones||XF-1150, OV-105 (propyl)|
|Other||OV-275, Dexsil series|
|Sulfur compounds||Dimethyl sulfide, polysulfones, Poly-S series|
|Phosphorous compounds||Phosphoesters||Tricresyl phosphate (TCP),
trixylyl phosphate (TXP)
|Salts, organic acids, chlorine compounds||Bentone 34|
Sunpak-A consists of highly cross-linked, high performance porous polymer beads developed using our company’s original technology. Sunpak-A displays high levels of resolution and quality. Separations can be performed using Sunpak-A for compounds in a wide variety of fields. Sunpak-A can also be used as a support by coating with stationary phases, allowing for analyses of compounds which cannot be separated on diatomaceous earth supports due to adsorption.
unpak-S is designed for analyses of sulfur compounds in short chain hydrocarbons.
1,2,3-TCEP, 5-ring PPE, and β,β’-ODPN columns have been officially designated for analyses of sulfur compounds. However, carbonyl sulfide cannot be separated from methane, ethylene, and ethane on 1,2,3-TCEP and 5-ring PPE columns. In addition, carbonyl sulfide and hydrogen sulfide cannot be separated from methane and ethylene on β,β’-ODPN columns.
Quenching phenomena occur when sulfur compounds and excessive levels of hydrocarbons are eluted at the same time, with the result that correct qualitative analyses of sulfur compounds cannot be achieved. In order to avoid this problem, perfect separations of hydrocarbons from sulfur compounds are required. Sunpak-S makes these separations possible.
TENAX®TA is suitable for analyses of alcohols, glycols, diols, amines, high boiling point compounds, and highly polar compounds. However, it is not suitable for analyses of hydrocarbons.
It is also useful as a trap material designed to collect atmospheric organic compounds such as styrene monomers.
Standard prepacked columns are prepared in order to provide users with optimal separations of compounds in a wide range of fields.
Standard packed columns are listed according to analytical purpose.
Packed columns and capillary columns are used for GC analyses. Packed columns are glass or stainless steel tubes packed with diatomaceous earth coated with stationary phases. Capillary columns consist of fused silica or stainless tubing with stationary phases coated on or chemically bonded to their inner walls. This page provides an introduction to our superior GC packing materials.