title: Biosensor for enantioselective analysis of S-cilazapril, S-trandolapril, and S-pentopril.
abstract: The purpose of this research was to construct an amperometric biosensor on L-amino acid oxidase (L-AAOD) supported on a carbon paste for the enantioselective analysis of S-cilazapril (I), S-trandolapril (II), and S-pentopril (III). A chemically modified carbon paste was constructed with L-AAOD. The proposed amperometric biosensor proved reliable for the purity of I, II, and III. The linear working ranges obtained for drug assay were 0.001-100 mumol/l (I), 0.02-10 mumol/l (II), 0.08-50 mumol/l (III) over the pH ranges 7.0-7.4 (I), 6.8-7.4 (II), and 7.0-7.4 (III). The low limits of detection obtained were 5 pmol/l (I), 15 mumol/l (II), and 5 mumol/l (III), respectively. The selectivity of the biosensors was checked by both mixed and separate solution methods. Polyvinylpyrolidone and D-proline did not interfere with the assay of the studied drugs, whereas L-proline presented a potent interfering species. The relative standard deviation values (< 0.2%) make the biosensors suitable for direct amperometric assay of these angiotensin-converting enzyme (ACE) inhibitors. The proposed amperometric biosensor that was based on L-AAOD proved reliable in the analysis of the above-mentioned ACE inhibitors and can be used for the quality control of these drugs.
authors.affiliation: Department of Biological and Medical Research, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia. enein@kfshrc.edu.sa
authors.forename: H Y
authors.initials: HY
authors.lastname: Aboul-Enein
authors.forename: R I
authors.initials: RI
authors.lastname: Stefan
authors.forename: G L
authors.initials: GL
authors.lastname: Radu
mesh_terms: D000806:Angiotensin-Converting Enzyme Inhibitors / Q000032:analysis*; D015374:Biosensing Techniques; D017315:Cilazapril / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D007211:Indoles / Q000032:analysis*; D013237:Stereoisomerism
chemical_list: D000806:Angiotensin-Converting Enzyme Inhibitors; D007211:Indoles; D017315:Cilazapril; C052035:trandolapril; C038810:CGS 13945