title: Flow field-flow fractionation/multiangle light scattering of sodium hyaluronate from various degradation processes.
abstract: Sodium hyaluronate (NaHA) is an ultrahigh molecular weight polysaccharide that is found in body tissues, synovial fluid, the vitreous humor, and the umbilical cord, and the size characterization of NaHA is important in pharmaceutical applications. On-line field-flow fractionation/multiangle light scattering/differential refractive index (FlFFF/MALS/DRI) has been applied for the study of degradation efficiency of sodium hyaluronate (NaHA). A NaHA raw sample was degraded by different chemical or physical methods and the degraded NaHA samples were separated using field-programming FlFFF, in which separation is achieved by differences in diffusion coefficients or hydrodynamic diameters. Separation was followed by serial detection using MALS and DRI. Molecular weight distribution (MWD) and information relating to the radius of gyration of the NaHA samples were examined for the raw and degraded NaHA samples. Samples studied include: two different products of ultrasonic degradation, two products of alkaline degradation, and four different products of enzymatic degradation. While alkaline degradation showed a moderate degradation compared to ultrasonic and enzymatic methods in reducing average MW, the latter two degradation methods showed significant changes in average molecular weight and in conformation of NaHA.
authors.affiliation: Department of Chemistry, Yonsei University, Seoul 120-749, South Korea. mhmoon@yonsei.ac.kr
authors.forename: Myeong Hee
authors.initials: MH
authors.lastname: Moon
authors.forename: Da Young
authors.initials: DY
authors.lastname: Shin
authors.forename: Namkoo
authors.initials: N
authors.lastname: Lee
authors.forename: Euijin
authors.initials: E
authors.lastname: Hwang
authors.forename: Il-Hwan
authors.initials: IH
authors.lastname: Cho
mesh_terms: D031521:Fractionation, Field Flow / Q000379:methods*; D006820:Hyaluronic Acid / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008027:Light; D008970:Molecular Weight; D012542:Scattering, Radiation; D014465:Ultrasonics
chemical_list: D006820:Hyaluronic Acid