title: Determination of molecular weight of heparin by size exclusion chromatography with universal calibration.
abstract: The molecular weight (MW) of heparin can be accurately determined by size exclusion chromatography using "universal calibration." A universal calibration curve was constructed for Superose 12 with standard pullulan samples and verified using characterized ficoll fractions. This calibration yielded the correct MW of heparin as determined by light scattering, when the ionic strength of the mobile phase was maintained over 1.0M. Sodium poly(styrenesulfonate) samples were not suitable standards because of adsorption at high salt concentration and repulsion from the packing material at low ionic strength. The extraordinarily high charge density of heparin leads to the need for high salt concentration to screen such repulsions.
authors.affiliation: Department of Chemistry, Indiana University-Purdue University, 402 N Blackford Steet, Indianapolis, IN 46202-3274, USA.
authors.forename: X
authors.initials: X
authors.lastname: Guo
authors.forename: M
authors.initials: M
authors.lastname: Condra
authors.forename: K
authors.initials: K
authors.lastname: Kimura
authors.forename: G
authors.initials: G
authors.lastname: Berth
authors.forename: H
authors.initials: H
authors.lastname: Dautzenberg
authors.forename: P L
authors.initials: PL
authors.lastname: Dubin
mesh_terms: D002138:Calibration; D002850:Chromatography, Gel / Q000379:methods*; D006493:Heparin / Q000737:chemistry* / Q000302:isolation & purification; D008027:Light; D008970:Molecular Weight; D012542:Scattering, Radiation; D014783:Viscosity
chemical_list: D006493:Heparin