取代基对聚β-环糊精衍生物吸附碱性品红性能的影响

以环氧氯丙烷为交联剂,设计合成了3种吸附剂——聚羟丙基-β-环糊精(PHP-β-CD)、聚羧甲基-β-环糊精(PCM-β-CD)两个聚β-环糊精衍生物和不带取代基的聚β-环糊精(P-β-CD)。用X射线衍射技术对PHP-β-CD和PCM-β-CD的结构表征结果显示,它们均为无定形聚集态。考察了吸附条件对3种吸附剂吸附碱性品红吸附量的影响。实验结果表明,PCM-β-CD吸附碱性品红的吸附量最大,P-β-CD吸附碱性品红的吸附量最小;体系pH对PCM-β-CD吸附碱性品红吸附量的影响最大。在室温、碱性品红初始质量浓度250 mg/L、体系pH=5.24、振荡时间2.5 h的条件下,P-β-CD和PHP-β-CD吸附碱性品红的吸附量分别为32.3,39.0 mg/g;其他条件不变,体系pH=5.43时,PCM-β-CD吸附碱性品红的吸附量为54.6 mg/g。3种吸附剂对碱性品红的吸附满足Freundlich等温方程。

Separation Properties of a New Polysiloxane-Anchored β-Cyclodextrin Derivative as Gas Chromatography Stationary Phase

A new capillary gas chromatography stationary phase, monokis (2,6 di O benzyl 3 O propyl (3’)) hexakis(2,6 di O benzyl 3 O methyl) β CD bonded polysiloxane, was synthesized. It exhibited separation abilities to disubstituted benzene isomers and some chiral solutes. It was also found that the polarity of CD derivatives can be lowered both by chemically bonding it to polysiloxane and by diluting it in polysiloxane. The separation abilities of the polysiloxane anchored CDs (SP CD) are higher than that of the unbonded CDs (S CD) and the diluted S CD at lower column temperature. Hydrosilylation reaction is one of the best methods to lower the operating temperature of CDs.