title: Reversed-phase high-performance liquid chromatography and capillary electrophoresis in the stability study of the neuropeptide growth factor antagonist [Arg6,D-Trp7,9,MePhe8]-substance P (6-11): a comparative study.
abstract: Reversed-phase high-performance liquid chromatography and capillary zone electrophoresis are widely used in protein and peptide analysis. Degradation of the basic peptide [Arg6,D-Trp7,9,MePhe8]-substance P (6-11) (antagonist G) was monitored with reversed-phase high-performance liquid chromatography, free capillary zone electrophoresis, and capillary zone electrophoresis with a capillary cationic coating. Capillary zone electrophoresis with a dynamically coated capillary provided better separation between antagonist G and its degradation products (formed at pH/Hv 13) than high-performance liquid chromatography and free zone capillary electrophoresis. Rate constants of the alkaline degradation of antagonist G measured with reversed-phase high-performance liquid chromatography and capillary zone electrophoresis with a dynamic coated capillary wall are similar whereas the values measured with free zone capillary electrophoresis are lower. Rate constants for the degradation of antagonist G in acidic media are comparable for the three techniques. It is concluded that capillary zone electrophoresis using a dynamic coating with Fluorad is the most suited of the above-mentioned techniques in analyzing antagonist G and its degradation products.
authors.affiliation: Department of Pharmaceutical Analysis, Faculty of Pharmacy, Utrecht University, The Netherlands.
authors.forename: J L
authors.initials: JL
authors.lastname: Reubsaet
authors.forename: J H
authors.initials: JH
authors.lastname: Beijnen
authors.forename: A
authors.initials: A
authors.lastname: Bult
authors.forename: J
authors.initials: J
authors.lastname: Teeuwsen
authors.forename: E H
authors.initials: EH
authors.lastname: Koster
authors.forename: J C
authors.initials: JC
authors.lastname: Waterval
authors.forename: W J
authors.initials: WJ
authors.lastname: Underberg
mesh_terms: D000595:Amino Acid Sequence; D002851:Chromatography, High Pressure Liquid; D004355:Drug Stability; D004586:Electrophoresis / Q000379:methods; D007700:Kinetics; D008969:Molecular Sequence Data; D015394:Molecular Structure; D009414:Nerve Growth Factors / Q000037:antagonists & inhibitors*; D010446:Peptide Fragments / Q000737:chemistry*; D013373:Substance P / Q000031:analogs & derivatives* / Q000037:antagonists & inhibitors* / Q000737:chemistry
chemical_list: D009414:Nerve Growth Factors; D010446:Peptide Fragments; C046958:substance P (6-11), Arg(6)-Trp(7,9)-Me-Phe(8)-; D013373:Substance P