title: Fractionation of horseradish peroxidase by preparative isoelectric focusing, gel chromatography and ion-exchange chromatography.
abstract: Horseradish peroxidase has been fractionated by preparative isoelectric focusing in a density gradient and in a layer of granulated gel using pH-3-10 and narrow-pH-range carrier ampholytes at different total enzyme loads. The resolution of peroxidase isoenzymes in preparative-layer isoelectric focusing was comparable to that obtained by analytical thin-layer isoelectric focusing. Isoelectrically homogeneous isoenzymes could be isolated with good recovery in a single fractionation step. Despite the excellent separation of the individual isoenzymes by isoelectric focusing in gel layers, an effective purification, indicated by the absorbance ratio A403mn/A278nm, could not be achieved by focusing applied as a single step. By different fractionation sequences combining gel chromatography, ion-exchange chromatography, and isoelectric focusing, individual isoenzymes with a high purity and homogeneous with respect to their size and charge properties have been isolated.
mesh_terms: D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D006735:Horseradish Peroxidase / Q000302:isolation & purification*; D006863:Hydrogen-Ion Concentration; D007525:Isoelectric Focusing; D010544:Peroxidases / Q000302:isolation & purification*
chemical_list: D006735:Horseradish Peroxidase; D010544:Peroxidases