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Clinical Chemistry 34: 906-910, 1988;
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Clinical Chemistry, Vol 34, 906-910, Copyright © 1988 by American Association for Clinical Chemistry

Colorimetric assay of blood coagulation factor XIII in plasma

KN Lee, PJ Birckbichler and MK Patterson Jr
Samuel Roberts Noble Foundation, Inc., Biomedical Division, Ardmore, OK 73402.

In this new colorimetric assay for Factor XIII in plasma, 5- (biotinamido)pentylamine is used as the amine substrate. Factor XIII, a zymogen, is transformed by thrombin and Ca2+ to active Factor XIIIa, and the incorporation of 5-(biotinamido)pentylamine into N,N- dimethylcasein is used to measure catalytically active Factor XIIIa. The biotinylated enzymatic product is immobilized onto 96-well microtiter plates, complexed with streptavidin-beta-galactosidase, and the absorbance at 405 nm is monitored for production of p-nitrophenol from p-nitrophenyl-beta-D-galactopyranoside. Concentrations of N,N- dimethylcasein, 5-(biotinamido)pentylamine, Ca2+, and thrombin were chosen to allow near-maximum velocity of amine incorporation. A linear relationship was obtained between assay product and plasma volume, from 0.5 to 50 microL of plasma. Results correlated well (r greater than 0.924) with those from the most frequently utilized radiometric filter- paper assay for Factor XIII. The method appears to be ideal for routine diagnostic estimation of Factor XIII in plasma because of its simplicity, its lack of use of radioisotopes, and its potential for assay of large numbers of samples by use of microtiter plates and automated plate readers.


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Copyright © 1988 by the American Association for Clinical Chemistry.