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A new method to prepare polysaccharide-coating type chiral stationary phases(CSPs) was developed in this work. As a typical example, naked silica gel was coated by cellulose, which was then derivatized with 3,5-dimethylbenzoyl chloride to afford cellulose tris(3,5-dimethylbenzoate)-silica gel(CTDBS) complex. The silanols on CTDBS were end-capped with 3-aminopropyltriethoxysilane to obtain CSP 1. The amino groups on CSP 1 were further end-capped with 3,5-dimethylbenzoyl chloride to give CSP 2. The silanols on CTDBS were end-capped with methyltrimethoxysilane to yield CSP 3. CSPs 1-3 were characterized by FTIR, solid-state 13C-NMR and elemental analysis. The enantioseparation abilities of CSPs 1-3 were evaluated with structurally various chiral analytes. The enantioseparation results demonstrated that the end-capping moieties on CSPs 1 and 2 significantly affected enantioseparation. In addition, the effect of the structures of chiral analytes and endcapping moieties on the retention factors and the resolutions was discussed.
A new method to prepare polysaccharide-coating type chiral stationary phases (CSPs) was developed in this work. As a typical example, naked silica gel was coated with cellulose, which was then derivatized with 3,5-dimethylbenzoyl chloride to afford cellulose tris 3,5-dimethylbenzoate) -silica gel (CTDBS) complex. The silanols on CTDBS were end-capped with 3-aminopropyltriethoxysilane to obtain CSP 1. The amino groups on CSP 1 were further end-capped with 3,5-dimethylbenzoyl chloride to give CSP 2. The silanols on CTDBS were end-capped with methyltrimethoxysilane to yield CSP 3. CSPs 1-3 were characterized by FTIR, solid-state 13C-NMR and elemental analysis. The enantioseparation abilities of CSPs 1-3 were evaluated with structurally various chiral analytes. The enantioseparation results demonstrated that the end-capping moieties on CSPs 1 and 2 significantly affected enantioseparation. In addition, the effect of the structures of chiral analytes and endcapping moieties on the retention fact ors and the resolutions was discussed.