title: Immobilization and chromatographic evaluation of novel regioselectively substituted amylose-based chiral packing materials for HPLC.
abstract: The regioselectively substituted amylose derivatives bearing a 4-tert-butylbenzoate or 4-chlorobenzoate group at 2-position, and 3,5-dichlorophenylcarbamate and a small amount of 3-(triethoxysilyl)propylcarbamate groups at 3- and 6-positions were synthesized by a two-step process based on the esterification of 2-position of a glucose unit. The obtained derivatives were effectively immobilized onto macroporous silica gel by intermolecular polycondensation of triethoxysilyl groups. Their chiral recognition abilities were evaluated as chiral packing materials (CPMs) for high-performance liquid chromatography. These CPMs showed high chiral recognition as well as the conventional coated-type CPM, and can be used with the eluents-containing chloroform and tetrahydrofuran. With the extended use of these eluents, improvement of chiral recognition and reversed elution orders were realized. For some racemates, the immobilized CPM exhibited ability comparable or better to the commercial immobilized amylose- or cellulose-based columns, Chiralpak IA, IB, and IC.
authors.affiliation: Polymer Materials Research Center, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Shen
authors.forename: Pengfei
authors.initials: P
authors.lastname: Li
authors.forename: Shuangyan
authors.initials: S
authors.lastname: Liu
authors.forename: Xiande
authors.initials: X
authors.lastname: Shen
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Okamoto