title: Determination of picogram amounts of lipoxin A4 and lipoxin B4 by high-performance liquid chromatography with electrochemical detection.
abstract: A new method for the determination of lipoxins with electrochemical detection after high-performance liquid chromatography is described. The half-wave potentials of lipoxin A4 and lipoxin B4 at a glassy carbon electrode and a mobile phase of methanol-water (65:35 v/v) and 1 mM trifluoroacetic acid was found to be +1.14 V versus an Ag/AgCl reference electrode. The use of trifluoroacetic acid instead of sulphuric acid and lithium perchlorate led to a background current of 6-8 nA at +1.20 V. The detection limits for both lipoxins, based on a signal-to-noise ratio of 3:1 were found to be 5-10 pg (15-30 fmol). The new method was applied to an extract of human polymorphonuclear granulocytes, preincubated with 15-hydroxyeicosatetraenoic acid and stimulated with Ca2+ ionophore A23187.
authors.affiliation: Pharmaceutical Institute, University of Tübingen, F.R.G.
authors.forename: T
authors.initials: T
authors.lastname: Herrmann
authors.forename: D
authors.initials: D
authors.lastname: Steinhilber
authors.forename: J
authors.initials: J
authors.lastname: Knospe
authors.forename: H J
authors.initials: HJ
authors.lastname: Roth
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D002851:Chromatography, High Pressure Liquid; D004563:Electrochemistry; D006801:Humans; D006863:Hydrogen-Ion Concentration; D006893:Hydroxyeicosatetraenoic Acids / Q000032:analysis*; D007536:Isomerism; D044045:Lipoxins; D009504:Neutrophils / Q000032:analysis; D013056:Spectrophotometry, Ultraviolet
chemical_list: D006893:Hydroxyeicosatetraenoic Acids; D044045:Lipoxins; C040527:lipoxin A4; C042651:lipoxin B4