Activated silica supports for preparation of chromatographic sorbents. A comparative study of silicas containing attached epoxy, tosyloxy and halogen groupsстатья

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[1] Mingalyov P. G., Fadeev A. Y. Activated silica supports for preparation of chromatographic sorbents. a comparative study of silicas containing attached epoxy, tosyloxy and halogen groups // Journal of Chromatography A. — 1996. — Vol. 719, no. 2. — P. 291–297. A comparative study of silica sorbents with attached epoxy, tosyloxy and halogen groups is presented. Epoxy-activated sorbents are shown to have the lowest concentration of attached functional groups among the activated sorbents studied. The low content of epoxy groups is suggested to originate from the partial destruction of epoxy rings during the modification of silica. New methods of epoxidation without the use of epoxysilanes and tosylation without the use of tosyl chloride are proposed. Haloalkyl-activated sorbents are shown to have the highest content of attached functional groups in a bonded layer. It is suggested that haloalkyl-activated sorbents are the most promising for the preparation of sorbents with high loadings of immobilized ligands.

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