Post Archive

January 2017

Chromatography

  Filtration of polar samples A polar aqueous sample requires a hydrophilic membrane.  The hydrophilic membrane of the cellulose mixed esters (MV) syringe filter has very low adsorption of dissolved substances and is suitable for such sample. If the sample additionally contains water-soluble oligomers and polymers (especially biological macromolecules) a

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Chromatography

Always the right syringe filter For the preparation of complex samples including after successful derivatization of the analytes, a rapid filtration is required.  This is necessary to protect the instrument from damage by particulates.  Most analysts simply use the first syringe filter they find in the lab.  However, often that

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Chromatography

Applications of the wide pore RP phases NUCLEODUR® 300 The NUCLEODUR® 300 RP phases are used for the analysis of biological macromolecules like proteins (s. appl. nos. 126580, 126800, 126570) and peptides (s. appl. no. 126610). Separations of protein and peptide mixtures with wide pore RP phases can be also

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Chromatography

Wide Pore Reversed Phase Stationary Phases for Biochromatography In biochromatography, mostly macromolecules are analyzed or purified.  Due to their large molecular size and properties these macromolecules require special stationary phases with pores larger than the more standard 100 Å pores that stationary phases typically have.  Thus, many manufacturers offer columns

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