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The use of derivatized cyclodextrins as solubilizing agents in the preparation of macroporous polymers employed as amphiphilic continuous beds in capillary electrochromatography
Author(s) -
AlRimawi Fuad,
Pyell Ute
Publication year - 2006
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.200600218
Subject(s) - capillary electrochromatography , amphiphile , electrochromatography , polymer , chromatography , chemistry , capillary action , capillary electrophoresis , materials science , organic chemistry , copolymer , composite material
Abstract Employing solubilization by complexation with CDs, new mixed‐mode monolithic stationary phases for CEC and μ‐LC were synthesized. Free radical copolymerization was performed in aqueous solution with a CD‐solubilized hydrophobic monomer, a water‐soluble crosslinker (piperazinediacrylamide), and a charged monomer (vinylsulfonic acid). Different hydrophobic methacrylate monomers (isobornyl, adamantyl, cyclohexyl, and phenyl methacrylate) were investigated. Chromatographic properties of the synthesized monoliths were studied with aqueous and nonaqueous mobile phases with hydrophobic and polar analytes. Due to the amphiphilic nature of the polymers synthesized, the elution orders obtained correspond to the RP mode and to the normal‐phase mode dependent on the polarity of the mobile phase. However, observations made with polar solutes and polar mobile phase can only be explained by a mixed‐mode retention mechanism. The influence of the total monomer concentration (%T) on the chromatographic properties and on the specific permeability was elucidated. Run‐to‐run, day‐to‐day, and capillary‐to‐capillary reproducibility of electroosmotic mobility and retention factors were determined. Comparison of retention data with those of a commercial octadecyl silica gel HPLC column reveals that the methylene selectivity of the monolithic capillaries prepared in this study is very similar to that of routinely used octadecyl silica gels.