VDSpher® II Phases
The new VDSpher II separation phases are both a stand-alone silica line and an excellent addition to VDSpher PUR and Classic. This opens up additional options for better substitution of separation phases of other brands. VDSpher II is also based on high-purity silica gel (99.999%), has a large chromatographic surface (100 Å) and a large pore volume. It is suitable for smaller molecules, but also as a standard ODS (C18) phase. VDSpher II is available in 2 pore and 2 particle sizes.
Physical specifications of VDSpher II reversed phases:
Pore Size [Å] |
100 | 120 |
|---|---|---|
Surface [m2/g] |
450 | 300 |
Pore Volume [mL/g] |
1.1 | 1.0 |
Si-Conzentration [%] |
99.999 | 99.999 |
Metal content [ppm] |
<10 | <10 |
VDSpher® II Phases
VDSpher II has excellent chemical and mechanical stability. The carefully controlled complete endcapping shows the best separation properties for acidic, basic and chelating compounds, making it the ideal choice for a wide range of organic compounds.
VDSpher II ODS modifications are excellent all-rounders for an extremely wide range of HPLC applications. The ODS-HD modification is very well suited for extreme pH values due to the high carbon content and excellent endcapping and shows brilliant peak sharpness. ODS-EPG (Embedded Polar Group) with the polar embedded group has a different selectivity than normal ODS phases and is therefore also suitable for 100% aqueous applications and polar analytes.
Notice: VDSpher II 120 ODS is ideal for replacing Shodex C18-4D & C18-4E columns.
Data of VDSpher II phases:
| Phase | available particle sizes |
Functionali- |
Endcapping | Carbon |
pH range |
USP Code |
|---|---|---|---|---|---|---|
VDSpher II 100 ODS |
3 & 5 | mono |
ja | 17 | 1.5 - 9 | L1 |
| VDSpher II 100 ODS-HD | 3 & 5 | mono |
ja | 24 | 1 - 10 | L1 |
| VDSpher II 120 ODS | 3 & 5 |
mono |
ja | 17 |
2 - 8 | L1 |
| VDSpher II 120 ODS-EPG | 3 & 5 | mono |
ja | 15 | 2 - 7.5 | L1 |
Engelhard test on various VDSpher II phases.
Engelhard-Test: MeOH:H2O 55:45, flow 1.0 ml/min, UV 254 nm, ambient temperature.