Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 1191, Issue 1-2, Pages 83-89Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2007.12.012
Keywords
HILIC column; mixed-mode stationary phase; polar molecules; ethoxylated surfactants; liquid chromatography
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We have developed a new stationary phase that combines both hydrophilic interaction and reversed-phase characteristics. The new phase is based on high-purity, porous and spherical silica gel functionalized with a silyl ligand consisting of both hydrophilic and hydrophobic functionalities. This phase can be operated in both HILIC mode (high organic solvent) and RPLC mode (low organic solvent). An optimal balance of hydrophilic and hydrophobic moieties on the silica surface provides unique chromatographic properties that make it useful for determination of alkyl chain distribution and degree of ethoxylation (EO number) of nonionic ethoxylated surfactants. (c) 2007 Elsevier B.V. All rights reserved.
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