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A 1.4-nm gold cluster covalently attached to antibodies improves immunolabeling
JF Hainfeld and FR Furuya
Biology Department, Brookhaven National Laboratory, Upton, New York 11973.
A large gold cluster (Au1.4nm) was covalently coupled to IgG and Fab' fragments. Its gold core is 1.4 nm in diameter and the Fab'-Au1.4nm immunoconjugate is the smallest gold immunoprobe that can be seen directly in the conventional electron microscope. It is useful in high- resolution immunolabeling, providing a resolution of 7.0 nm. The cluster's visibility can be enhanced with silver development for use in EM or light microscopy for histological purposes, or to detect less than or equal to 0.2 pg of antigen in immunoblots. By using a gold compound with covalent attachment, a number of advantages over colloidal gold probes are realized, including better resolution, stability, uniformity, sensitivity, and complete absence of aggregation; its small size should also improve penetration and more quantitative labeling of antigenic sites.
Volume 40,
Issue 2,
pp. 177-184,
02/01/1992
Copyright © 1992 by The Histochemical Society
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