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Characterisation of RPLC columns packed with porous sub‐2 μm particles
Author(s) -
Petersson Patrik,
Euerby Melvin R.
Publication year - 2007
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.200700086
Subject(s) - silanol , transferability , particle size , packed bed , analytical chemistry (journal) , particle (ecology) , selectivity , chromatography , porosity , chemistry , particle size distribution , silane , resolution (logic) , materials science , organic chemistry , mathematics , statistics , oceanography , logit , computer science , geology , catalysis , artificial intelligence
Eight commercially available sub‐2 μm octadecyl silane columns (C18 columns) have been characterised by the Tanaka protocol. The columns can be grouped into two groups that display large differences in selectivity and peak shape due to differences in hydrophobicity, degree of surface coverage and silanol activity. Measurements of particle size distributions were made using automated microscopy and electrical sensing zone measurements. Only a weak correlation could be found between efficiency and particle size. Large differences in column backpressure were observed. These differences are not related to particle size distribution. A more likely explanation is differences in packing density. In order to take full advantage of 100–150 mm columns packed with sub‐2 μm particles, it is often necessary to employ not only an elevated pressure but also an elevated temperature. A comparison between columns packed with sub‐2, 3 and 5 μm versions of the same packing indicates potential method transferability problems for several of the columns due to selectivity differences. Currently, the best alternative for fast high‐resolution LC is the use of sub‐2 μm particles in combination with elevated pressure and temperature. However, as shown in this study additional efforts are needed to improve transferability as well as column performance.