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Reference type: Journal
Authors: Paik P, Gedanken A, Mastai Y
Article Title: Chiral separation abilities: Aspartic acid block copolymer-imprinted mesoporous silica.
Publication date: 2010
Journal: Microporous And Mesoporous Materials
Volume: 129
Issue: (1-2)
Page numbers: 82-89.
DOI: 10.1016/j.micromeso.2009.09.001
Alternative URL: http://www.sciencedirect.com/science/article/B6TH4-4X5JRBS-2/2/b576aa8a25365e218941a827b3e8f735

Abstract: Herein we report on the synthesis of chiral mesoporous silica (CMS) that can be used for chiral separation from a racemic mixture of two enantiomers. The CMS with a pore size of 3-5 nm and a high surface area of 725 m2 g-1 was synthesized by templating chiral block copolymers (CBCs) of polyethylene oxide (PEG) and D/L-aspartic acid (D/L-AspA), [PEO45-b-(D/L-AspA)10]. The chiral mesopores were characterized by HRTEM, small angle XRD and BET. The chiral resolution abilities and the chiral separation kinetics of the copolymer-extracted CMS were investigated using a racemic mixture of valine by circular dichroism (CD) and optical polarimetry. The chiral resolution of the CMS was further verified with a racemic mixture of alanine. A chiral selectivity factor of 7.52 was found for the specific enantiomer which is adsorbed preferably. These results allow a new approach towards enantiomeric separation and other enantiomeric applications of novel CMS
Template and target information: D/L-aspartic acid, D/L-AspA, chiral block copolymers
Author keywords: chiral separation, Chiral mesoporous silica, Chiral block copolymers


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