title: Determination of plasma aminothiols by high performance liquid chromatography after precolumn derivatization with N-(2-acridonyl)maleimide.
abstract: Design, synthesis and properties of new derivatization reagent N-(2-acridonyl)-maleimide (MIAC) for thiol groups is presented. The reaction of MIAC with aminothiols is specific, very fast and yield highly fluorescent products. The HPLC method for determination of homocysteine, cysteine and glutathione based on utilization of MIAC is developed. A baseline separation of derivatives is achieved by isocratic elution on reverse phase column within 6 min. The method is linear in the range of 0.5-25 microM for homocysteine and glutathione, and in the range of 0.5-200 microM for cysteine. The limits of detection for homocysteine, cysteine and glutathione are 1.2, 1.4 and 2.0 pmol, respectively, per 20 microl injection. Within and between-run precision expressed as relative standard deviations are in the range of 1.35-4.38% and 0.89-4.13%, respectively.
authors.affiliation: Department of Chemistry and Biochemistry, Medical University of Sofia, 2 Zdrave str, Sofia 1431, Bulgaria.
authors.forename: Bistra
authors.initials: B
authors.lastname: Benkova
authors.forename: Valentin
authors.initials: V
authors.lastname: Lozanov
authors.forename: Ivaylo P
authors.initials: IP
authors.lastname: Ivanov
authors.forename: Antonia
authors.initials: A
authors.lastname: Todorova
authors.forename: Ivan
authors.initials: I
authors.lastname: Milanov
authors.forename: Vanio
authors.initials: V
authors.lastname: Mitev
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods* / Q000592:standards; D003545:Cysteine / Q000097:blood / Q000737:chemistry*; D005978:Glutathione / Q000097:blood / Q000737:chemistry*; D006710:Homocysteine / Q000097:blood / Q000737:chemistry*; D006801:Humans; D008301:Maleimides / Q000097:blood / Q000737:chemistry*; D010949:Plasma / Q000737:chemistry*; D012015:Reference Standards; D012680:Sensitivity and Specificity
chemical_list: D008301:Maleimides; C532121:N-(2-acridonyl)maleimide; D006710:Homocysteine; D005978:Glutathione; D003545:Cysteine