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Effect of particle size on labeling density for catalase in protein A- gold immunocytochemistry

S Yokota

Department of Anatomy, Yamanashi Medical School, Japan.

Effect of particle size on labeling intensity in protein A-gold immunocytochemistry was studied. Catalase labeling of rat liver peroxisomes was used as a labeling model. Ultra-thin sections of Lowicryl K4M-embedded rat liver were stained for catalase with protein A-gold (pAg) probes. Five different sizes of colloidal gold probes, from 5 nm to 38 nm in diameter, were prepared. Labeling intensity decreased as the particle size of the pAg probes increased. The highest labeling was obtained by the 5-nm pAg probe and the lowest by the 38-nm pAg probe. Quantitative analysis also showed that labeling density was inversely proportional to the size of gold particles. The results suggest that the pAg probe with small gold particles has high sensitivity.

Volume 36, Issue 1, pp. 107-109, 01/01/1988
Copyright © 1988 by The Histochemical Society


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