Microparticle-enhanced nephelometric immunoassay of human plasminogen.
A microparticle-enhanced nephelometric immunoassay was developed for plasminogen quantitation in human plasma. It is based on the nephelometric measurement of the light scattered by microparticle clusters formed during a sandwich reaction between plasminogen, microparticle--anti-plasminogen conjugate, and the free antibodies of anti-plasminogen rabbit antiserum. This immunoassay was sensitive (detection limit in reaction mixture, 34 micrograms/L) and could be performed in 500-fold diluted human plasma, excluding any interference or sample pretreatment. It allowed the quantitation of plasminogen on a large range of concentrations (17-550 mg/L), with a security in antigen excess reaching 1,100 mg/L, with accuracy (linear recovery in dilution-overloading assay and correlation with conventional immunonephelometry), and precision (within- and between-run coefficients of variation lower than 8%). A normal reference range from 54 to 148 mg/L (mean +/- 2 SD) was calculated from plasminogen concentration in plasma from 130 adults. Easy to perform (no washing or phase separation) and rapid (two steps of 30 minutes then 1 hour of incubation at room temperature), this microparticle-enhanced nephelometric immunoassay could be an interesting alternative method for human plasminogen quantitation.
Marchal
E
E
Immunology Laboratory, Faculty of Medicine, Nancy, France.
Montagne
P
P
Cuillière
M L
ML
Béné
M C
MC
Faure
G
G
D000328:Adult; D000918:Antibody Specificity; D005260:Female; D006801:Humans; D007118:Immunoassay / Q000379:methods; D008297:Male; D008875:Middle Aged; D009391:Nephelometry and Turbidimetry / Q000379:methods; D010316:Particle Size; D010958:Plasminogen / Q000032:analysis* / Q000276:immunology; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
D010958:Plasminogen