Stable-bond polymeric reversed-phase/weak anion-exchange mixed-mode stationary phases obtained by simultaneous functionalization and crosslinking of a poly(3-mercaptopropyl)methylsiloxane-film on vinyl silica via thiol-ene double click reaction
| Autor: | Jeannie Horak, Ulrich Woiwode, Wolfgang Bicker, Aleksandra Zimmermann, Michael Lämmerhofer, Stefanie Bäurer, Orlando L. Sánchez-Muñoz, Markus Kramer, Wolfgang Lindner |
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| Rok vydání: | 2018 |
| Předmět: |
Anions
Siloxanes Polymers Sulfonic acid 010402 general chemistry 01 natural sciences Biochemistry Analytical Chemistry chemistry.chemical_compound Endcapping Polymer chemistry Sulfhydryl Compounds Ene reaction chemistry.chemical_classification Chromatography Reverse-Phase Chromatography Chemistry Elution Hydrophilic interaction chromatography 010401 analytical chemistry Organic Chemistry General Medicine Chromatography Ion Exchange 0104 chemical sciences Mixed-mode chromatography Siloxane Surface modification Click Chemistry Polyvinyls |
| Zdroj: | Journal of chromatography. A. 1593 |
| ISSN: | 1873-3778 |
| Popis: | A polymeric reversed-phase/weak anion exchange (Poly-RP/WAX) mixed-mode stationary phase has been prepared by coating of a poly(3-mercaptopropyl)methylsiloxane film on vinyl-modified silica (100 A, 5 μm) and simultaneous in situ functionalization with N-(10-undecenoyl)-3-aminoquinuclidine as well as crosslinking to the vinyl silica surface by solventless thiol-ene double click reaction. Such bonding chemistry showed greatly enhanced stability compared to brush-type analogs with bifunctional siloxane bonding to silica. Solid-state 29Si-CP/MAS NMR confirmed the immobilization of the siloxane layer. pH-Dependent ζ-potential determinations revealed a high anion-exchange capacity over the entire pH range with a maximum around pH 5. Oxidation of residual thiols yielded a zwitterionic Poly-RP/WAX/SCX mixed-mode phase with sulfonic acid endcapping and shifted the still net positive surface charge to lower ζ-potentials. It allowed a faster elution of strongly retained anionic species in particular of multiply negatively charged analytes such as oligonucleotides. Chromatographic tests under RPLC and HILIC elution mode with various test substances documented the multimodal utility and complementarity in retention profiles compared to RP, HILIC and commercial mixed-mode phases. |
| Databáze: | OpenAIRE |
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