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. 1983 Sep;18(3):601–608. doi: 10.1128/jcm.18.3.601-608.1983

Nylon bead enzyme-linked immunosorbent assay for detection of sub-picogram quantities of Brucella antigens.

V Y Perera, M T Creasy, A J Winter
PMCID: PMC270861  PMID: 6415094

Abstract

An indirect sandwich enzyme-linked immunosorbent assay, using antibody covalently coupled to nylon beads, has been adapted for the detection of Brucella antigens. Optimum conditions were achieved by incubation of 1 ml of reaction mixture with a single bead, and by minimizing nonspecific interactions through the use of beads coated with purified bovine antibodies, preabsorption of third layer rabbit antibodies with normal bovine serum, and treatment of beads with normal goat serum before addition of the goat anti-rabbit enzyme conjugate. Beta-galactosidase was selected for use with clinical samples primarily because of low levels of endogenous enzyme in bovine leukocytes. Use of a fluorogenic substrate enhanced sensitivity 20-fold. Under these conditions, 100 fg of solubilized crude lipopolysaccharide or 8 to 10 Brucella cells was detectable in a fixed volume of 1 ml. A system was also devised for concentrating antigen which permitted ready detection of 2 pg of lipopolysaccharide in a volume of 50 ml (40 fg/ml). Attempts to detect lipopolysaccharide in the presence of concentrated serum or plasma were unsuccessful, but 10 brucellae added to a suspension of leukocytes from 100 ml of normal bovine blood were easily measured.

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Selected References

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