HCl has a acid-constant of -6 (strong acid) and formic acid has 3,75 (medium
strong acid).
Strong acids saponificate amidgroups resulting in an acid-group,
deamination. Aminogroups are the reactionpartners of the collagen-stains.
Therefore they can't bind to a deaminated collagen. Another function of a
strong acid is to break down the peptidlinkage and generally denaturate a
protein. The three-dimensional configuration of collagen could also
influence the staining affinity.
Doesn't Immunocal consist of formic acid and formaldehyd? I consider, that
the deamination-effect and the break down appear more on underfixed
specimen; and that formic acid isn't strong enough to disturb the
collagen-configuration in the same manner.
My thoughts about it, but no academic evidence.
Gudrun Lang
Biomed. Analytikerin
Histolabor
Akh Linz
Krankenhausstr. 9
4020 Linz
+43(0)732/7806-6754
-----Ursprüngliche Nachricht-----
Von: histonet-bounces@lists.utsouthwestern.edu
[mailto:histonet-bounces@lists.utsouthwestern.edu] Im Auftrag von Michele
Wich
Gesendet: Mittwoch, 19. Dezember 2007 19:24
An: histonet@lists.utsouthwestern.edu
Betreff: [Histonet] decalcifiers and Safranin O staining
Can anyone explain the chemistry behind decalcifying agents and the
Safranin O procedure?...Specifically, why does using Immunocal (formic
acid) as a decalcifier yield beautiful Safranin O staining while RDO
(HCL) almost totally eliminates staining? Does HCL do something to the
proteoglycans that formic acid does not?
~Michele
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