title: Electrophoretic studies of polygalacturonate oligomers and their interactions with metal ions.
abstract: Polygalacturonic acid, a linear homopolysaccharide, was investigated by capillary electrophoresis (CE) using linear polyacrylamide-coated capillaries and laser-induced fluorescence (LIF) detection. A successful separation of its fluorescently labeled oligomers was achieved through sieving in polyacrylamide entangled matrices. The reaction conditions for the derivatization of polygalacturonic acid were optimized. In studying the interactions between polygalacturonic acid and various metal ions, the end-label, free-solution electrophoretic (ELFSE) technique, developed earlier in our laboratory (Sudor, J., Novotny, M. V., Anal. Chem. 1995, 67, 4205-4209) was found preferable to the sieving method. ELFSE is fast and convenient in that no polymer solutions are needed for the separation. The investigation showed that for the moderately large oligomers, the strongest binding occurred with calcium and cadmium ions, while the smallest interaction was observed with magnesium ions.
authors.affiliation: Department of Chemistry, Indiana University, Bloomington 47405, USA.
authors.forename: S K
authors.initials: SK
authors.lastname: Wiedmer
authors.forename: A
authors.initials: A
authors.lastname: Cassely
authors.forename: M
authors.initials: M
authors.lastname: Hong
authors.forename: M V
authors.initials: MV
authors.lastname: Novotny
authors.forename: M L
authors.initials: ML
authors.lastname: Riekkola
mesh_terms: D002104:Cadmium; D002118:Calcium; D002413:Cations, Divalent; D019075:Electrophoresis, Capillary / Q000379:methods; D004591:Electrophoresis, Polyacrylamide Gel / Q000379:methods; D007202:Indicators and Reagents; D009844:Oligosaccharides / Q000737:chemistry* / Q000302:isolation & purification*; D010368:Pectins / Q000737:chemistry*; D012545:Schiff Bases; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D002413:Cations, Divalent; D007202:Indicators and Reagents; D009844:Oligosaccharides; D012545:Schiff Bases; C412763:oligogalacturonic acid; D002104:Cadmium; D010368:Pectins; D002118:Calcium; C003181:polygalacturonic acid