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虫向前爬

银虫 (小有名气)

应助: 0 (幼儿园)
金币: 485.9
帖子: 139
在线: 58.1小时
虫号: 969581
注册: 2010-03-13
性别: MM
专业: 胶体与界面化学

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Two novel types of substituted cyclam-capped β-cyclodex-
trin(β-CD)- bonded silica particles have been prepared
and used as chiral stationary phases in capillary electro-
chromatography(CEC).The two stationary phases have
a chiral selector with three recognition sites:β-CD,
cyclam,and the latter’s sidearm.They exhibit excellent
enantioselectivities in CEC for a wider ange of compounds
as a result of the cooperative functioning of the anchored
β-CD and cyclam.After inclusion of the metal ion(Ni )
from the running buffer into the substituted cyclams and
their sidearm ligands,the bonded stationary phases
become positively charged and can provide extra electro-
static interactions with ionizable solutes and enhance the
dipolar interactions with some polar neutral solutes.This
enhances the host-guest interaction with somesolutes
and improves chiral recognition and enantioselectivity.
These new types of stationary phases exhibit great poten-
tial for fast chiral separations in CEC.

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