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These COSMOSIL® columns use packing materials with different alkyl chains such as C8 (octyl), C4 (butyl) and TMS (trimethyl). As the length of alkyl chain shortens, the hydrophobic interaction becomes weaker.
Owing to the near-perfect end capping treatment and very low level of free silanol compared to the C18 columns, COSMOSIL® alkyl-chained columns can be used widely for the general analysis of compounds including those for which C18 columns produce long retention times.
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Material characteristics |
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5C8-MS |
5C4-MS |
5TMS-MS |
| Silica gel |
high purity pherical porous silica |
| Average particle size |
5µm |
| Averasge pore size |
approx. 120Å |
| Specific surface area |
approx. 300m²/g |
| Stationary phase |
octory group |
butyl group |
trimethyl group |
| End capping treatment |
near-perfect treatment |
| Carbon content |
approx. 10% |
approx. 7% |
approx. 5% |
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Behavior of polar compounds |
For the analysis of non-polar compounds such as benzene and toluene, the column shows weaker retention as the length of alkyl chain becomes shorter.
The retention increases for polar compounds such as acetophenone and methyl benzoate.
Click  Click |
Ordering information |
COSMOSIL® 5C8-MS
| Product name |
Size |
Code No. |
End-fitting |
| COSMOSIL® 5C8-MS Guard Column |
4.6mmI.D.x 10mm |
38151-31 |
Waters type |
| 10mmI.D.x 20mm |
38152-21 |
| COSMOSIL® 5C8-MS Packed Column |
4.6mmI.D.x 50mm |
38153-11 |
| 4.6mmI.D.x 100mm |
38154-01 |
| 4.6mmI.D.x 150mm |
38155-91 |
| 4.6mmI.D.x 250mm |
38156-81 |
| 6mmI.D.x 150mm |
38157-71 |
| 6mmI.D.x 250mm |
38158-61 |
| 10mmI.D.x 250mm |
38159-51 |
| 20mmI.D.x 250mm |
38160-11 |
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COSMOSIL® 5C4-MS
| Product name |
Size |
Code No. |
End-fitting |
| COSMOSIL® 5C4-MS Guard Column |
4.6mmI.D.x 10mm |
38161-01 |
Waters type |
| 10mmI.D.x 20mm |
38162-91 |
| COSMOSIL® 5C4-MS Packed Column |
4.6mmI.D.x 50mm |
38163-81 |
| 4.6mmI.D.x 100mm |
38164-71 |
| 4.6mmI.D.x 150mm |
38165-61 |
| 4.6mmI.D.x 250mm |
38166-51 |
| 6mmI.D.x 150mm |
38167-41 |
| 6mmI.D.x 250mm |
38168-31 |
| 10mmI.D.x 250mm |
38169-21 |
| 20mmI.D.x 250mm |
38170-81 |
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COSMOSIL® 5TMS-MS |
| Product name |
Size |
Code No. |
End-fitting |
| COSMOSIL® 5TMS-MS Guard Column |
4.6mmI.D.x 10mm |
38171-71 |
Waters type |
| 10mmI.D.x 20mm |
38172-61 |
| COSMOSIL® 5TMS-MS Packed Column |
4.6mmI.D.x 50mm |
38173-51 |
| 4.6mmI.D.x 100mm |
38174-41 |
| 4.6mmI.D.x 150mm |
38175-31 |
| 4.6mmI.D.x 250mm |
38176-21 |
| 6mmI.D.x 150mm |
38177-11 |
| 6mmI.D.x 250mm |
38178-01 |
| 10mmI.D.x 250mm |
38179-91 |
| 20mmI.D.x 250mm |
38180-51 |
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| (C)2004 Nacalai Tesque, Inc. E-mail: info.intl@nacalai.co.jp |