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Tissue fixation and staining with osmium tetroxide: the role of phenolic compounds

AJ Nielson and WP Griffith

It has been postulated that phenol-containing areas of plant and animal tissues were osmiophilic, but proof of direct interaction between osmium tetroxide and phenolic materials, or the nature of such reactions, has been lacking. We find that, under conditions similar to those of normal tissue fixation, osmium tetroxide reacts rapidly with those phenols containing o-dihydroxy groups (including such species found in plant tissues) to give very stable chelate complexes. We conclude that these complexes are responsible for the observed electron- density in phenol-containing areas of tissue treated with osmium tetroxide, so that such phenols are indeed osmiophilic.

Volume 26, Issue 2, pp. 138-140, 02/01/1978
Copyright © 1978 by The Histochemical Society


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