TSKgel NH2-100 amino columns expand the range of TSKgel columns for hydrophilic interaction chromatography (HILIC). Offering a different selectivity from the well known TSKgel Amide-80 columns, these novel amino-bonded phase columns stand out by providing much improved chemical stability, a prerequisite for achieving reproducible and reliable results.
TSKgel NH2-100 columns are packed with 3µm silica particles containing 100Å pores. A novel bonding strategy was adopted to improve chemical stability of the bonded phase. First the silica is reacted with a trimethylsilane endcapping reagent at a low stoichiometric ratio, before reacting residual and accessible silanol groups with trifunctional alkylaminosilane reagent. The resulting bonded phase provides a better safeguard against hydrolysis of the underlying silica.
TSKgel NH2-100 columns are unique in that the bonded phase ligand not only, as expected, has a terminal primary amino group, but that the spacer also incorporates secondary as well as tertiary amino groups. Anionic compounds are retained on the column by ionic interaction. This allows for the use of gradients in salt concentration, in addition to gradient elutions with acetonitrile. Since the TSKgel NH2-100 columns have cationic sites, the columns can be used as mixed mode columns under some conditions.
TSKgel NH2-100 columns are well suited for the analysis of all types of hydrophilic compounds, including carbohydrates and peptides. Due to a high ligand density and large surface area, these columns show stronger retention of polar compounds than TSKgel Amide-80 columns.
Now available: a TSKgel NH2-100 DC column that connects directly to TSKgel reversed phase columns. The DC in TSKgel NH2-100 DC emphasizes this Direct Connect aspect. This column has the same packing material as the TSKgel NH2-100 columns, so therefore shows high retention for hydrophilic compounds/ions. A male-type outlet endfitting enables the direct connection to the screw-type endfitting of a TSKgel reversed phase column. This allows for the simultaneous separation using a linear gradient of an active pharmaceutical ingredient (API) and its counterion without the loss of column efficiency normally experienced when connecting two columns with capillary tubing. For two applications, see the TSKgel NH2-100 DC Product Overview.
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