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An investigation of optimal gold particle size for immunohistological immunogold and immunogold-silver staining to be viewed by polarized incident light (EPI polarization) microscopy

IO Ellis, J Bell and JD Bancroft

Department of Histopathology, Queen's Medical Centre, University Hospital, Nottingham, United Kingdom.

We investigated the optimal gold particle size for use with polarized incident light (epi polarization) microscopy with immunogold immunohistological preparation in both immunogold indirect (IGS) and silver-enhanced immunogold-silver staining (IGSS) techniques. A range of gold particle sizes from 5 nm-40 nm was used along with tissue of known immunoreactivity with a well-characterized primary monoclonal antibody. Checkerboard titrations were carried out for each technique and for each particle size. The preparations were viewed using a standard polarized incident light microscope and assessed in a semi- quantitative manner. Adequate visualization of gold particles was achieved using the indirect staining method only with a particle size of 40 nm. With silver enhancement (IGSS), particles of all sizes were clearly seen. However, 5-nm particles were considered optimal for this method because of reduced background staining, high titration of antisera possible, and crisp localization of the visual signal.

Volume 36, Issue 1, pp. 121-124, 01/01/1988
Copyright © 1988 by The Histochemical Society


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