COSMOSIL Alkyl, ODS Series HPLC Columns

COSMOSIL ODS columns are monomeric types of C18 phase. A new endcapping treatment with polar groups for "shield effect" has extended the pH range and significantly improved peak shape for basic compounds. This phase is recommended for most of applications but particularly effective for low molecular weight organic compounds. Columns packed with the octadecyl group bonded type silica gel (C₁₈, ODS) are the most widely employed. We offer three types of octadecyl group bonded columns: COSMOSIL C₁₈-MS-II, C₁₈-AR-II and C₁₈-PAQ, each of which has a different separation property. 

Bonded C ₂₂ (Tokoname chamber group), C ₈ (octyl group), C ₄ (butyl group) and TMS (ethyl group) offillers on the type COSMOSIL alkyl (alkyl type) Kalam Kalam. Kalam on the sample, depending on the action of lipophilic Kalam to stay the order C ₂₂ = C ₁₈ > C ₈ > C ₄ > TMS. Kalam with C ₁₈ or C- ₂₂ is lower than the lipophilic action is effective to separate the highly lipophilic compound or compounds that have many differences between lipophilic structure. Lipophilic C ₁₈ and C ₂₂ However, the C- ₂₂stereochemistry of selectivity (stereoselectivity) is higher than the C _18.