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Kim, Manhoe,Way, J. Douglas,Baldwin, Robert M. 한국화학공학회 2004 Korean Journal of Chemical Engineering Vol.21 No.2
Mesoporous glass beads and 5um silica particles were modified with beta-cyclodextrin(β-CD)by means of directly bonding, linking spacer group, and cross-linking agent. The selectivities of the β-CD modified silica particles were measured by simple column chromatography to separate a model mixture of 1-and 2-hydroxy-naphthalene(naphthols)and ortho, meta, and para-xylene. In the packed column chromatography experiments, two major controlling factors(inclusion complex formation effect and steric hindrance effect of the analytes)on the separations were observed. The elusion orders of the β-CD directly bonded glass beads were meta-, para-, ortho-xylene and 1-naphthol,2-naphthol. The phenomena of β-CD pore blocking and narrowing by spacer groups and cross-linking agent were observed. The spacer group and cross-linking agent decreased inclusion complex formation of 2-naphthol.
A Study on Direct Loading of Beta-Cyclodextrins on Glass Beads as Chromatographic Separators
Kim, Manhoe,Way, James Douglas,Baldwin, Robert M. 한국화학공학회 2003 Korean Journal of Chemical Engineering Vol.20 No.3
Bata-cyclodextrin(β-CD) was successfully loaded on the surface of glass beads without spacer group or cross-linking agent. The directly loaded β-CD was stable in toluene and methanol flows but critically hurt in more polar solvent such as water and dimethylformamide. Cross-linking could stabilize the directly bonded β-CD glass beads. Pore openings of cyclodextrin can be narrowed or blocked by end-capping agent, spacer groups, and cross-linking agents. The β-CD directly bonded glass beads have a capability to form inclusion complexes with larger host molecules because this method can avoid pore narrowing and blocking problems.
Manhoe Kim,J. Douglas Way,Robert M. Baldwin 한국화학공학회 2004 Korean Journal of Chemical Engineering Vol.21 No.2
Mesoporous glass beads and 5 mm silica particles were modified with beta-cyclodextrin ( b-CD) by means of directly bonding, linking spacer group, and cross-linking agent. The selectivities of the b-CD modified silica particles were measured by simple column chromatography to separate a model mixture of 1- and 2-hydroxy-naphthalene (naphthols) and ortho, meta, and para-xylene. In the packed column chromatography experiments, two major controlling factors (inclusion complex formation effect and steric hindrance effect of the analytes) on the separations were observed. The elusion orders of the b-CD directly bonded glass beads were meta-, para-, ortho-xylene and 1-naphthol, 2-naphthol. The phenomena of b-CD pore blocking and narrowing by spacer groups and cross-linking agent were observed. The spacer group and cross-linking agent decreased inclusion complex formation of 2-naphthol.