I disagree. Usually a dye binds covalently to the mordant, and a mordant should be a multi-valent metal (like aluminium, ferrum, molybden,..). The dye-mordant-complex binds via the mordant to the substrate. Picric acid of Bouin's is washed out before staining.
It may be a matter of definition of the term mordant. Gudrun -----Ursprüngliche Nachricht----- Von: Johnson, Carole [mailto:[email protected]] Gesendet: Freitag, 06. März 2015 15:10 An: [email protected] Betreff: RE: [Histonet] Trichrome & Fixation Boiuns solution acts as a mordant in trichrome stains -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Gudrun Lang Sent: Friday, March 06, 2015 1:13 AM To: 'Amos Brooks' Cc: [email protected] Subject: AW: [Histonet] Trichrome & Fixation Hi, years ago we did a stain called CAB (=one step trichrome) regularly on liver-tissue. I don't know if it was because of ignorance or with aim, but it was done without Bouin. The result was blue-grey hepatocytes and darker blue collagen. - also totally different to the result with Bouin (red hepatocytes). I think the Bouin is less a "re-fixation" than more an "binding-site retrival" in this context. Gudrun -----Ursprüngliche Nachricht----- Von: [email protected] [mailto:[email protected]] Im Auftrag von Amos Brooks Gesendet: Donnerstag, 05. März 2015 22:01 An: [email protected] Betreff: [Histonet] Trichrome & Fixation Hi, It is interesting that you should mention the importance of fixation on the Trichrome stain. I have an image of two murine hearts processed, cut and stained side by side. The only difference between the two is that they were harvested at different times, so one sat in formalin long enough to be properly fixed the other one was placed in the fixative then immediately brought in to be processed from 70% ethanol on. They are *totally* different looking. The red muscle tissue looks more purple therefore less distinct from the blue blood vessels. You get a similar effect with lung bronchial epithelium. Cheers, Amos On Tue, Mar 3, 2015 at 1:00 PM, <[email protected]> wrote: > Message: 15 > Date: Tue, 03 Mar 2015 12:34:33 -0500 > From: John Kiernan <[email protected]> > Subject: Re: [Histonet] Masson trichrome and H and E > To: Emily Brown <[email protected]>, > "[email protected]" > <[email protected]> > Message-ID: <[email protected]> > Content-Type: text/plain; CHARSET=US-ASCII > > If you can't get two colours with H&E, don't expect to get the colour > scheme right with Masson's trichrome, which needs more skill. If you > are hoping to show basement membranes in the kidney, you would do > better to use a technically simpler staining method such as > picro-sirius red or periodic acid-Schiff. If for some reason you > really need three colours, a one-step trichrome such as Gomori's, > Cason's or Gabe's might be the way to go rather than Masson's or one > of the other multi-step trichromes. Remember that all trichrome > methods are greatly influenced by the fixative. A post-fixation > treatment of the sections, usually with picric acid, is needed for > formaldehyde-fixed tissues. Some alternative post-fixation treatments > were proposed by Yu & Chapman (2003) J. Histotechnol. 26(2): 131-134, but > their coloured photos were not very convincing. > > Making up staining solutions in-house is always cheaper than buying > pre-made solutions. > > John Kiernan > London, Canada > _______________________________________________ Histonet mailing list [email protected] http://lists.utsouthwestern.edu/mailman/listinfo/histonet _______________________________________________ Histonet mailing list [email protected] http://lists.utsouthwestern.edu/mailman/listinfo/histonet Confidentiality Notice: New Mexico has a very broad public records law. Most written communications to or from state employees are public records. Your e-mail communications may therefore be subject to public disclosure. This e-mail, including all attachments is for the sole use of the intended recipients. Any unauthorized review, use, disclosure or distribution is prohibited unless specifically provided under the New Mexico Inspection of Public Records Act. _______________________________________________ Histonet mailing list [email protected] http://lists.utsouthwestern.edu/mailman/listinfo/histonet
