title: Carboxymethyl chitosan-coated capillary and its application in CE of proteins.
abstract: A hydrophilic basic polysaccharide, carboxymethyl chitosan (CMC) as a capillary coating is presented with a simple preparation procedure. The CMC-coated capillary showed a long lifetime of more than 100 runs, and had good tolerance to some organic solvents, 0.1 M HCl, 0.1 M NaOH, and 5 M urea. The run-to-run, day-to-day, and capillary-to-capillary RSDs for the CMC-coated capillary were all below 2.0% for the determination of EOF. Moreover, the coatings with different concentrations and molecular weights of CMC were also investigated. The CMC-coated capillary was successfully applied to separate basic proteins and recombinant human erythropoietin (rhEPO). Furthermore, several experimental parameters, such as the concentration and pH of the running buffer, temperature, and applied voltage, were optimized for the separation of rhEPO glycoforms. Comparison of an uncoated capillary with chitosan- and CMC-coated capillaries for the separation of rhEPO glycoforms was also discussed. The results demonstrated that rhEPO glycoforms can be well separated by a CMC-coated capillary within 8 min with good reproducibility and resolution. Finally, the volatile BGE HAc-NH4Ac was utilized to separate rhEPO for its further application with CE-MS, achieving a satisfactory result.
authors.affiliation: Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Institute of Analytical Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing, PR China.
authors.forename: Xiaofang
authors.initials: X
authors.lastname: Fu
authors.forename: Ling
authors.initials: L
authors.lastname: Huang
authors.forename: Fei
authors.initials: F
authors.lastname: Gao
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.forename: Nannan
authors.initials: N
authors.lastname: Pang
authors.forename: Maolin
authors.initials: M
authors.lastname: Zhai
authors.forename: Huwei
authors.initials: H
authors.lastname: Liu
authors.forename: Moutian
authors.initials: M
authors.lastname: Wu
mesh_terms: D000327:Adsorption; D002021:Buffers; D048271:Chitosan / Q000031:analogs & derivatives* / Q000737:chemistry*; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D019075:Electrophoresis, Capillary / Q000295:instrumentation* / Q000379:methods; D004921:Erythropoietin / Q000032:analysis; D006801:Humans; D020033:Protein Isoforms / Q000032:analysis; D011506:Proteins / Q000032:analysis*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D011994:Recombinant Proteins; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013499:Surface Properties
chemical_list: D002021:Buffers; D020099:Coated Materials, Biocompatible; D020033:Protein Isoforms; D011506:Proteins; D000644:Quaternary Ammonium Compounds; D011994:Recombinant Proteins; D004921:Erythropoietin; D048271:Chitosan