利用醛基和氨基之间的席夫碱反应在SiO2微球表面引入聚合物分子聚乙烯亚胺（ polyethyleneimine，PEI），以提高微球表面的氨基含量；然后利用自组装-化学镀法制备了 SiO2@ Au 核壳填料，并对制备过程中反应溶液的pH值和甲醛用量进行了优化。场发射扫描电子显微镜表征结果显示，经过条件优化后制备的 SiO2@Au 核壳颗粒的表面 Au包覆量较高，且包覆均匀、分散性较好。最后将谷胱甘肽（ glutathione，GSH）分子修饰在 SiO2@ Au 表面，条件优化后成功地制备了一种新型的两性离子型亲水色谱材料 SiO2@ Au-GSH，并将该填料填入毛细管中，制备了 SiO2@Au-GSH两性离子型毛细管亲水色谱柱，并在毛细管液相色谱和加压毛细管电色谱系统中考察了色谱柱的亲水性能，研究证明 SiO2@Au-GSH毛细管柱具有较好的分离能力和亲水性质。
In order to improve the contents of —NH2 group on the surface of SiO2,polyethyleni-mine( PEI ) was introduced on the surface of SiO 2 through Schiff Base reaction. Then self-assembled monolayer electroless plating( SAM-electroless plating)method was used to prepare SiO2@Au core-shell particles. During this process,two factors were discussed. They were the reaction pH in the SiO2@Au seed forming phase and the reaction volume of formaldehyde in the SiO2@Au seed growth phase. The scanning electronic microscopy( SEM)showed the coverage of Au was high and the dispersity was uniform after the optimizations. As we know ,Au can coordinate with —SH group easily,so glutathione( GSH)can be bound on the surface of Au. In this study,GSH was bound on the surface of Au through the optimization of the reaction pH. The Fourier transform infrared spectrum showed that the GSH was bound on the surface of Au successfully at pH 3. At last,this packing material was packed into capillary column by slurry packing method to prepare SiO2@ Au-GSH capillary columns,and the capillary liquid chroma-tography( cLC)mode was used to certify the hydrophilic property of this kind of column. In addition,this kind of column was certified to have a good separation ability of polar compounds in pressurized capillary electrochromatography( pCEC)mode.
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