title: Quaternized cellulose-supported gold nanoparticles as capillary coatings to enhance protein separation by capillary electrophoresis.
abstract: Gold nanoparticles (Au NPs) were synthesized and stabilized by using water-soluble quaternized cellulose (QC) as support matrix through a straightforward and environmentally friendly aqueous-phase approach. The structure and morphology of QC-supported Au NPs (QC-Au NPs) were investigated systematically by UV-visible, FT-IR, x-ray diffraction and TEM measurement. The Au NPs with mean diameter of about 7nm were shown to efficiently redisperse in water due to the strong interaction between QC and Au NPs, and the solutions were quite stable after storage for nearly 4 months at room temperature. QC-Au NPs were subsequently used as novel physically adsorbed coatings for protein separation by CE. The separation performance was significantly improved in the capillary coated by QC-Au NPs compared with that of the uncoated capillary or QC coated capillary. A small quantity of Au NPs (Au content of 4.6%) was adequate for the obvious improvement of coating ability. The theoretical plate number of lysozyme in QC-Au1 NPs coated capillary was 2.9 times as much as that in QC coated capillary. We have demonstrated the separation of six model proteins with RSD of migration time less than 2.79% and RSD of peak area less than 4.81%. Furthermore, QC-Au NPs was applied to the analysis of closely related proteins and biological samples. With simplicity, high resolution and reproducibility, the proposed method shows potential for applications in proteomics and clinical diagnosis.
authors.affiliation: Department of Chemistry and Key Laboratory of Biomedical Polymers of Ministry of Education, Wuhan University, 430072, China.
authors.forename: Jun
authors.initials: J
authors.lastname: You
authors.affiliation: Center for Disease Prevention and Control of Futian District, Shenzhen 518040, China.
authors.forename: Lingguo
authors.initials: L
authors.lastname: Zhao
authors.affiliation: Department of Chemistry and Key Laboratory of Biomedical Polymers of Ministry of Education, Wuhan University, 430072, China.
authors.forename: Gongwei
authors.initials: G
authors.lastname: Wang
authors.affiliation: Center for Disease Prevention and Control of Futian District, Shenzhen 518040, China.
authors.forename: Haitao
authors.initials: H
authors.lastname: Zhou
authors.affiliation: Department of Chemistry and Key Laboratory of Biomedical Polymers of Ministry of Education, Wuhan University, 430072, China. Electronic address: zhoujp325@whu.edu.cn.
authors.forename: Jinping
authors.initials: J
authors.lastname: Zhou
authors.affiliation: Department of Chemistry and Key Laboratory of Biomedical Polymers of Ministry of Education, Wuhan University, 430072, China.
authors.forename: Lina
authors.initials: L
authors.lastname: Zhang
mesh_terms: D000818:Animals; D002482:Cellulose / Q000737:chemistry*; D019075:Electrophoresis, Capillary / Q000379:methods*; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D008892:Milk / Q000737:chemistry; D011506:Proteins / Q000032:analysis*; D015203:Reproducibility of Results; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D011506:Proteins; D006046:Gold; D002482:Cellulose
keywords: Capillary electrophoresis; Gold nanoparticles; Protein separation; Quaternized cellulose