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Clinical Chemistry 30: 1857-1860, 1984;
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Clinical Chemistry, Vol 30, 1857-1860, Copyright © 1984 by American Association for Clinical Chemistry

Standardized automated assay for functional alpha 1-antitrypsin

RE Mullins, RL Miller, RL Hunter and B Bennett

We describe an enzymic assay for the functional activity of alpha 1- antitrypsin, in which tosyl-Gly-Pro-Lys-p-nitroanilide acetate (Chromozym PL) is the trypsin substrate. For the indicating reaction, the concentration of substrate is about double the Km of its reaction with trypsin. This assay is an improvement over reactions involving N- alpha-benzoyl-DL-arginine p-nitroanilide as substrate, the solubility of which in water is less than the Km of its reaction with trypsin. The assay is standardized in terms of active sites of trypsin inhibited per liter of serum, with p-nitrophenyl-p'-guanidinobenzoate as the active site titrant. The results agreed well with those by an immunonephelometric assay for alpha 1-antitrypsin (r = 0.953). The within-run and run-to-run precision was approximately 3%. The results of the assay varied linearly with alpha 1-antitrypsin concentration from 0 to 60 mumol/L of serum. The minimum sample size was 50 microL, and analysis of 24 samples took less than 20 min.


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 Clin. Chem.Home page
D. Roche, A. Mesner, M. Al Nakib, F. Leonard, and P. Beaune
Automated Determination of Serum {alpha}1-Antitrypsin by Antitryptic Activity Measurement
Clin. Chem., March 1, 2009; 55(3): 513 - 518.
[Abstract] [Full Text] [PDF]


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Copyright © 1984 by the American Association for Clinical Chemistry.