title: Capillary zone electrophoresis of soil humic acid fractions obtained by coupling size-exclusion chromatography and polyacrylamide gel electrophoresis.
abstract: Capillary zone electrophoresis (CZE) was used for characterisation of soil humic acid (HA) fractions obtained by coupling size-exclusion chromatography with polyacrylamide gel electrophoresis, on the basis of their molecular size and electrophoretic mobility. CZE was conducted using several low alkaline buffers as background electrolyte (BGE): 50 mM carbonate, pH 9.0; 50 mM phosphate, pH 8.5; 50 mM borate, pH 8.3; 50 mM Tris-borate+1 mM EDTA+7 M urea+0.1% sodium dodecyl sulphate (SDS), pH 8.3. Independently of BGE conditions, the effective electrophoretic mobility of HA fractions were in good agreement with their molecular size. The better resolution of HA were obtained in Tris-borate-EDTA buffer with urea and SDS. This results indicated that CZE, mostly with BGE-contained disaggregating agents, is useful for separating HAs in fractions with different molecular sizes.
authors.affiliation: Department of Agroenvironmental Sciences and Technologies, University of Bologna, 40127 Bologna, Italy. l_cavani@hotmail.com
authors.forename: Luciano
authors.initials: L
authors.lastname: Cavani
authors.forename: Claudio
authors.initials: C
authors.lastname: Ciavatta
authors.forename: Olga E
authors.initials: OE
authors.lastname: Trubetskaya
authors.forename: Olga I
authors.initials: OI
authors.lastname: Reznikova
authors.forename: Gaida V
authors.initials: GV
authors.lastname: Afanas'eva
authors.forename: Oleg A
authors.initials: OA
authors.lastname: Trubetskoj
mesh_terms: D002850:Chromatography, Gel / Q000379:methods*; D019075:Electrophoresis, Capillary / Q000379:methods*; D004591:Electrophoresis, Polyacrylamide Gel / Q000379:methods*; D006812:Humic Substances / Q000032:analysis*; D012987:Soil / Q000032:analysis*
chemical_list: D006812:Humic Substances; D012987:Soil