Shinwasorb
Shinwasorb Specifications and Prices
Shinwasorb
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.
Features of Shinwasorb
- Chemically synthesized support, meaning that there are no variations between lots
As Shinwasorb is a chemically synthesized product, it does not display variations between lots, a problem which is common to diatomaceous earth supports. - Very few mesopores, resulting in almost no adsorption of samples
There are almost no micro- and mesopores present on the surfaces of Shinwasorb particles, with the result that peak tailing due to sample adsorption in pores does not occur.
- Does not contain heavy metals
Shinwasorb does not contain heavy metals, meaning that sample adsorption and decomposition do not occur.
- Superior physical strength, and almost no generation of fine particles
Shinwasorb possesses superior physical strength, and can be used without worrying about the generation of fine particles. - Possesses a uniform surface structure, as well as a specific surface area equivalent to or greater than diatomaceous earth supports
The surfaces of Shinwasorb particles possess macropores with uniform pore diameters, and Shinwasorb possesses a specific surface area equivalent to or greater than diatomaceous earth supports. Due to the uniform surface structure of Shinwasorb, uniform stationary phase coating thicknesses can be achieved, allowing for sharp, highly symmetrical peaks. - Can be coated with a wide range of stationary phases
The main component of Shinwasorb is silicon dioxide. Shinwasorb can be coated with a wide variety of different stationary phases in the same manner as diatomaceous earth supports.
Shinwasorb varieties
Shinwasorb-U
Consists of particles with acid treated surfaces, and is equivalent to acid washed (AW) diatomaceous earth supports.
Shinwasorb-S
Consists of Shinwasorb-U treated with dimethyldichlorosilane (DMCS), and is equivalent to AW-DMCS diatomaceous earth supports.
Please select the appropriate type for your analytical needs.
*Available as coated packing material and packed columns.
Shinwasorb Specifications and Prices
Physical properties of Shinwasorb
< Shinwasorb and white diatomaceous earth supports >
| Shinwasorb | Conventional white diatomaceous earth supports |
|
|---|---|---|
| SiO2 purity (%) | ＞ 99 | Approx. 90 |
| Packed density (g/ml) | 0.46 | 0.25～0.3 |
| Surface area (m2/g)* | 1.8 | 1～3 |
| Volume of pores less than 100 nm (cm3/g)* | ＜ 0.02 | Approx. 0.03 |
* Measured using nitrogen adsorption (BET) method.
Stationary phase amounts exceeding 25% can be applied to Shinwasorb. The following graph shows resolution values for iso-pentane and n-pentane, as well as theoretical plate numbers for n-pentane obtained using packed columns (1.1 m x 3.2 mm I.D., glass) with varying stationary phase (Silicone DC-200) ratios.
Application examples using Shinwasorb
Shown below is an example of a separation of the components of LP gas using a packed column (length: 9 m, I.D.: 3 mm, stainless steel) containing 40/60 mesh Shinwasorb-U coated with 25% sebaconitrile. The same separation using a column packed with 60/80 mesh Chromosorb-P AW is also shown for comparison.
Shinwasorb can be used for analyses of short chain hydrocarbon gases.
As Shinwasorb column pressures are slightly higher than those for columns packed with diatomaceous earth supports, the use of 40/60 mesh Shinwasorb is recommended when using long columns for analyses.
■Liquefied Petroleum Gases (Comparison of Shinwasorb and Chromosorb P)
Shown below are two examples of separations of short chain alcohols using packed columns (length: 2.1 m, I.D.: 3.2 mm, glass) containing Shinwasorb-S coated with 5% polyethylene glycol 20M. The same separation using a column packed with 60/80 mesh Chromosorb-W AW-DMCS is also shown for comparison.
Shinwasorb provides peaks with excellent symmetry and high theoretical plate numbers. 40/60 mesh Shinwasorb can provide theoretical plate numbers equivalent to or surpassing those for 60/80 mesh brown and white diatomaceous earth supports. Almost the same retention times as those for white diatomaceous earth supports can be achieved by coating Shinwasorb using half the stationary phase ratios (%) used for white diatomaceous earth supports.
■Short Chain Alcohols (Comparison of Shinwasorb and Chromosorb W)
Shown below is an example of a separation of organophosphorus compounds using a packed column (length: 2.1 m, I.D.: 3.2 mm, glass) containing Shinwasorb-S coated with 1% Silicone OV-17.
The same separation using columns packed with Shinwasorb-U and Chromosorb-W AW-DMCS are also shown for comparison.
As can be seen, methyl demeton (100 ppb), which is prone to peak tailing due to adsorption, can be detected in a stable manner.
Shinwasorb-U is also more inert than inactivated diatomaceous earth supports.
■Organophosphorus Compounds (Comparison of Shinwasorb and Chromosorb W)
Shown below is an example of a separation of organochlorine insecticides using a packed column (length: 2.1 m, I.D.: 3.2 mm, glass) containing Shinwasorb-S coated with 1% Silicone OV-17.
The same separation using columns packed with Shinwasorb-U and Chromosorb-W AW-DMCS are also shown for comparison.
As can be seen, endrin (100 ppb), which is prone to peak tailing due to adsorption, can be detected in a stable manner.
Shinwasorb-U is also more inert than inactivated diatomaceous earth supports.
■Organochlorine Insecticides (Comparison of Shinwasorb and Chromosorb W)
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