NEWS and INTERESTING FACTS

02/2019

Optigel CarbEx II, Polymer Phases for HPLC Applications

Under the name Optigel, VDS optilab offers various ion-exchange separation phases on a polymer basis. The matrix used as basic material is a polystyrene-divinylbenzene network modified in accordance with the desired function.

Here you will find more information:

 

01/2019

VDSpher® ALTO DESEMPENHO EM FASES DE SEPARAÇÃO - Folheto informativo em português.

Para os nossos clientes em Portugal e no Brasil, oferecemos o folheto informativo VDSpher em Português.

For our customers in Portugal and Brazil, our VDSpher info booklet is now also available in Portuguese.

 

01/2018

VDSpher® MS Phases

Mass spectrometry is becoming more and more crucial as an online detection method. The requirements of the LC/MS analytics are reflected in the conception of HPLC columns. To reduce the solvent quantity and so as not to endanger the vacuum created in the mass spectrometer, columns of smaller dimensions are normally preferred. To profit from a high resolution further, silica gel with a small particle size is recommended for the column. VDSpher MS satisfies this requirement with 2.5 µm separation phases. If the resolution is not crucial, VDSpher MS columns with 4 µm silica gels are also available.

In principle, any VDSpher column can be used for LC/MS. Because as a sensitive detection method, mass spectrometry is in a position to display very low impurities, depending on the application e.g., carry-overs from previous runs (“carry-over effect“) VDSpher MS phases are selected specially to avoid these effects. In all, ten different modifications are available. The C18 phases enable a large bandwidth of hydrophilic (C18-H, C18-LC-H) and hydrophobic (C18-DE, C18-B-DE) applications. The not endcapped phase C18-B has medium hydrophobicity. Additionally, there are hydrophobic VDSpher MS phases with C8, C4, Phenyl and CN modifications.

The pore diameter of all VDSpher MS phases is 100 Å. Available modifications are displayed below:

VDSpher® MS phases

Phase Endcapping Carbon content [%] pH range USP Code
VDSpher® MS 100 C18-DE yes 17.2 2 - 9 L1
VDSpher® MS 100 C18-B no 17.7 2 - 7.5 L1
VDSpher® MS 100 C18-B-DE yes 20.1 2 - 11 L1
VDSpher® MS 100 C18-H polar

11.5

2 - 7.5 L1
VDSpher® MS 100 C18-LC-H hydrophilic 13.5 2 - 8 L1
VDSpher® MS 100 C8-B-DE yes 11.2 2 - 10 L7
VDSpher® MS 100 C4-B-DE yes 7.3 2 - 9 L26
VDSpher® MS 100 Phenyl-DE yes 10.9 2 - 9 L11
VDSpher® MS 100 CN-DE yes 7.2 2 - 9 L10
VDSpher® MS 100 CN-DE-RP yes 7.2 2 - 9 L10
Sterols and Oxysterols
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