Abstract: The present invention concerns a method to detect the presence of an enzyme in in vivo or in vitro tissue or cell, which method comprises: (a) obtaining a tissue or cell sample to be analyzed; (b) contacting the tissue or cell sample with a substrate of the structure selected from the group consisting of: X=H or one or more natural or synthetic amino acids with or without amino blocking groups, Y=H or one or more natural or synthetic amino acids with or without amino blocking groups, wherein X and Y are the same or different and are amino acid sequences of between about 1 to 1,000,000 amino acids wherein each amino acid is the same or a different amino acid, with the proviso that at least one of X or Y is at least one amino acid; (c) when an enzyme is present in the tissue or cell sample which degrades X, Y and combinations thereof, fluorescent cresyl violet is released in the tissue sample producing a color change; (d) detecting the presence and amount of the enzyme pres

Abstract: A method of treating medical conditions with proteinase inhibitors of the formula: ##STR1## wherein B is H or an amino acid blocking group for the N-terminal amino acid nitrogen;R.sub.1 is an optionally protected .alpha.-amino acid side chain such that P.sub.2 is the residue of an .alpha.-amino acid selected from the group consisting of phenylalanine (Phe), leucine (Leu), tyrosine (Tyr) and valine (Val), and substituted analogs thereof, particularly including Tyr(OMe);R.sub.2 is an optionally protected .alpha.-amino acid side chain such that P.sub.1 is the residue of an .alpha.

Abstract: Substrates and their corresponding pharmaceutically acceptable acid salts derived from 7-amino-4-trifluoromethyl-quinolone are disclosed. These substrates are useful for determining the presence of an enzyme or enzyme inhibitor in a biological fluid, wherein the fluid is contacted with a substrate. This mixture is thereafter incubated to effect enzymatic hydrolysis. Subsequently, the presence of the free 7-amino-4-trifluoro-methylquinolone is fluorometrically detected.

Abstract: A method is disclosed for determining the presence of an enzyme in a biological fluid, which includes the steps of contacting the fluid with a synthetic chromogenic substrate, which is an amino acid derivative of 7-amino-4-trifluoromethylcoumarin; incubating the substrate-containing fluid to effect enzymatic hydrolysis; and fluorometrically determining the presence of the free 7-amino-4-trifluoromethylcoumarin chromophore in the hydrolyzate.

Abstract: Synthetic substrates are provided which may be represented as A-D. The A moiety thereof includes an amino acid, polypeptide, or derivative thereof. The D moiety thereof includes 7-amino coumarin derivatives having an electron withdrawing substituent group at the 3 position carbon or fused between the 3 and 4 position carbons.

Abstract: A method is disclosed for determining the presence of an enzyme in a biological fluid, which includes the steps of contacting the fluid with a synthetic chromogenic substrate, which is an amino acid derivative of 7-amino-4-trifluoromethylcoumarin; incubating the substrate-containing fluid to effect enzymatic hydrolysis; and fluorometrically determining the presence of the free 7-amino-4-trifluoromethylcoumarin chromophore in the hydrolyzate.