title: A fluorogenic substrate for angiotensin-converting enzyme in plasma.
abstract: A simple, sensitive, and reproducible assay for angiotensin-converting enzyme is described. It is based on the hydrolysis of the minimally fluorescent substrate p-nitrobenzyloxycarbonylglycyl-L-tryptophylglycine to the products p-nitrobenzyloxycarbonylglycine and the highly fluorescent L-tryptophylglycine. The L-tryptophylglycine was analyzed by fluorometry (lambda excitation = 285 nm; lambda emission = 350 nm). The mean value for human plasma (serum) is 16.5 nmol of substrate hydrolyzed per minute per milliter of plasma under the described assay conditions.
mesh_terms: D004151:Dipeptides; D005456:Fluorescent Dyes; D006801:Humans; D007700:Kinetics; D009578:Nitrobenzenes; D007703:Peptidyl-Dipeptidase A / Q000097:blood*; D013050:Spectrometry, Fluorescence / Q000379:methods; D014364:Tryptophan / Q000031:analogs & derivatives
chemical_list: D004151:Dipeptides; D005456:Fluorescent Dyes; D009578:Nitrobenzenes; D014364:Tryptophan; D007703:Peptidyl-Dipeptidase A