Sounds like covalent bonding...
...rather than electrostatic attraction only. Thank you.
At 10:12 30/08/02 -0300, Emmanuel Maicas wrote:
>It basically fixes the surface layer of tissue, thus coagulating the ink
>with the serum proteins. Formalin does the same thing but more slowly. I
>never use these solutions because it introduces a lot of acid in the final
>fixative (phosphate-buffered formalin), which does not have enough buffering
>capacity to neutralize it (measure the pH the next morning!). I suspect this
>acid is a source of variation in IHC staining for estrogen receptors in
>breast cancer. I simply ink and blot dry with several changes of gauze or
>paper towel before cutting the tissue - works well! It also eliminates the
>problem of storing picric acid powder.
>Emmanuel Maicas, Pathologist in Moncton, Canada
>From: Alex Knisely [mailto:firstname.lastname@example.org]
>Sent: Friday, August 30, 2002 4:26 AM
>To: HistoNet Server
>Subject: How does acid alcohol / picric acid "set" ink on tissue?
>Mechanism question, with some background in the text below:
>Through what steps does immersion in Bouin's fluid (with picric acid) or
>acid alcohol "set" India ink, or other cutting-in station coloured inks,
>Somehow I expect that Dr Monson will have this information at his fingers'
>Best thanks for any replies
>>X-MimeOLE: Produced By Microsoft Exchange V6.0.5762.3
>>Subject: RE: Thanks --
>>Date: Thu, 29 Aug 2002 14:23:07 -0400
>>Thread-Topic: Thanks --
>>From: "Smith, Allen"
>>To: "Alex Knisely"
>>X-MailScanner: Found to be clean
>>The principal active ingredient in Bouin's fluid is picric acid, which is
>>mostly ionized above
>>pH 2. In some cases picric acid does act as a mordant. I don't think it
>>does in this case. "Mordanting" implies a particular mechanism; I use the
>>word only where there is evidence for such a mechanism.
>>Allen A. Smith, Ph.D.
>>School of Graduate Medical Sciences
>> Podiatric Medicine and Surgery
>>Miami Shores, Florida 33161-6695
>>From: Alex Knisely [mailto:email@example.com]
>>Sent: Thursday, August 29, 2002 2:25 AM
>>To: Smith, Allen
>>Subject: Thanks --
>>-- is it thus wrong to write (or as I do to dictate during gross
>>descriptions) "The resection margins are inked black and the ink is
>>mordanted in Bouin's fluid / acid alcohol"?
>>At 12:23 28/08/02 -0400, you wrote:
>>> A mordant is an ion, almost always metallic, that binds to something
>>>the tissue and to the dye. a dye molecule that binds to the mordant or
>>>directly to a part of the tissue. Allen A. Smith, Ph.D.
>>>School of Graduate Medical Sciences
>>> Podiatric Medicine and Surgery
>>> 33161-6695 -----Original Message-----
>>>From: kevin williams [mailto:firstname.lastname@example.org]
>>>Sent: Wednesday, August 28, 2002 11:23 AM
>>>To: HistoNet Server
>>>Subject: The difference between a Mordant and an Auxocrome
>>> are they one in the same. Thanks for all your help Kev.
>>> Get more from the Web. FREE MSN Explorer download :
>>Alex Knisely, MD
>>Institute of Liver Studies
>>King's College Hospital
>>London SE5 9RS UK
>>+44 (0)20 - 7346 - 3125 telefax
>>+44 (0)20 - 7346 - 4627 office
>Alex Knisely, MD
>Institute of Liver Studies
>King's College Hospital
>London SE5 9RS UK
>+44 (0)20 - 7346 - 3125 telefax
>+44 (0)20 - 7346 - 4627 office
Alex Knisely, MD
Institute of Liver Studies
King's College Hospital
London SE5 9RS UK
+44 (0)20 - 7346 - 3125 telefax
+44 (0)20 - 7346 - 4627 office
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