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820011 Supelco

TSKgel® VMpak-25 HPLC Column

phase ammonium ion, quaternary, L × I.D. 5 cm × 2 mm, 7 μm particle size



Related Categories Analytical/Chromatography, HPLC, HPLC & FPLC Columns for Biopolymer Separations, TSKgel HPLC Columns, TOYOPEARL Bulk Media & Accessories, TSKgel Speciality Columns More...
material   stainless steel
mfr. no.   Tosoh, 20011
parameter   ≤0.5 M salt concentration
  0-100% organic solvent
  0.22 mL/min flow rate
  10-80 °C temperature
  20 bar max. pressure
application(s)   HPLC: suitable
L × I.D.   5 cm × 2 mm
matrix   hydroxylated methacrylic polymer
matrix active group   ammonium ion, quaternary phase
particle size   7 μm
operating pH   2 - 12
separation technique   mixed mode


General description

TSKgel® VMpak-25 columns are specialty columns for the analysis of basic drugs that are often difficult to retain with good peak shape on alkyl-bonded reversed phase columns. The packing material in TSKgel VMpak-25 columns is a hydrophilic vinyl polymer gel (7 μm), similar to that in TSKgel Alpha-2500 size-exclusion columns, although the column dimensions are more appropriate for non-SEC applications. Depending on the mobile phase composition, compounds will be retained by a combination of reverse phase and cation exchange on residual carboxylic acid groups.

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TSKgel is a registered trademark of Tosoh Corporation

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