A composition, test device and method for determining the presence of leukocytes, esterase and/or esterase activity in a test sample is disclosed. The composition comprises an ester which, when cleaved by esterolytic activity, produces a detectable response such as color formation. In addition the composition comprises the compound 3-quinuclidinol. The device is prepared by incorporating a carrier matrix, such as paper, with the composition. The method comprises contacting a test sample with the device and observing a detectable response.
Composition and test device for determining the presence of leukocytes, esterase and protease in a test sample
申请人:MILES INC.
公开号:EP0157326A2
公开(公告)日:1985-10-09
A composition for determining the presence of leukocytes, esterase or protease in a test sample. The composition comprises an ester having the structure
in which: A is an N-blocked-amino acid residue or an N-blocked-peptide residue, X is O, S or NR', R is aryl, or lower alkyl, R* is H, or lower alkyl, and R' is H, lower alkyl or aryl; and a suitable buffer substance.
Improved methodology for colorimetrically determining the concentration of white blood cells in a biological fluid
申请人:Bayer Corporation
公开号:EP0713093A2
公开(公告)日:1996-05-22
A composition, method and test device for determining the presence of leukocytes, esterase or protease in a test sample are disclosed. The composition comprises an ester which is hydrolyzed in the presence of leukocyte, esterase or protease to form a reaction product which couples with a diazonium salt to produce a detectable color change. The composition further comprises the salt of an alkaline earth metal which stabilizes the composition during manufacture and prevents the occurrence of false or background color change due to reactivity of the diazonium salt in the absence of leukocyte, esterase or protease.