title: Capillary isoelectric focusing and fluorometric detection of proteins and microorganisms dynamically modified by poly(ethylene glycol) pyrenebutanoate.
abstract: The nonionogenic pyrene-based tenside, poly(ethylene glycol) pyrenebutanoate, was prepared and applied in capillary isoelectric focusing with fluorometric detection. This dye was used here as a buffer additive in capillary isoelectric focusing for a dynamic modification of the sample of proteins and microorganisms. The values of the isoelectric points of the labeled bioanalytes were calculated with use of the fluorescent pI markers and were found comparable with pI of the native compounds. The mixed cultures of proteins and microorganisms, Escherichia coli CCM 3954, Staphylococcus epidermidis CCM 4418, Proteus vulgaris, Enterococcus faecalis CCM 4224, and Stenotrophomonas maltophilia, the strains of the yeast cells, Candida albicans CCM 8180, Candida krusei, Candida parapsilosis, Candida glabrata, Candida tropicalis, and Saccharomyces cerevisiae were reproducibly focused and separated by the suggested technique. Using UV excitation for the on-column fluorometric detection, the minimum detectable amount was down to 10 cells injected on the separation capillary.
authors.affiliation: Institute of Analytical Chemistry, Academy of Sciences of the Czech Republic, Veverí 97, 61142 Brno, Czech Republic. horka@iach.cz
authors.forename: Marie
authors.initials: M
authors.lastname: Horka
authors.forename: Filip
authors.initials: F
authors.lastname: Ruzicka
authors.forename: Jaroslav
authors.initials: J
authors.lastname: Horký
authors.forename: Veronika
authors.initials: V
authors.lastname: Holá
authors.forename: Karel
authors.initials: K
authors.lastname: Slais
mesh_terms: D001419:Bacteria / Q000187:drug effects / Q000302:isolation & purification*; D019075:Electrophoresis, Capillary / Q000379:methods; D005470:Fluorometry / Q000379:methods; D007525:Isoelectric Focusing / Q000379:methods; D011092:Polyethylene Glycols / Q000494:pharmacology*; D011506:Proteins / Q000302:isolation & purification*; D011721:Pyrenes / Q000494:pharmacology*; D015203:Reproducibility of Results; D015003:Yeasts / Q000187:drug effects / Q000302:isolation & purification*
chemical_list: D011506:Proteins; D011721:Pyrenes; C002218:1-pyrenebutyrate; D011092:Polyethylene Glycols