Re: paraformalin again
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From: | vandeplas@aurion.nl (Peter van de Plas) |
To: | Histonet@pathology.swmed.edu |
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Content-Type: | text/plain; charset="us-ascii" |
John Carroll Dennis wrote:
A 4% paraform./PBS prep has gotten out of hand. The paraformalin will not
go into solution. The pH is at least 10 (by ph paper). Temp. is 65
deg. C.
I decided to use NaOH pellets this time. I don't know why. Normally, I
use 10 N NaOH. Never have I seen this problem.
Any ideas?
Does anyone know at what pH paraformalin goes into solution at between 60
and 70 deg. C?
--------------------------
Dear John,
To avoid problems with depolymerization I always prepare 2x conc.
paraformaldehyde in distilled water. Bring to 65 degrees C and add a few
drops of 10M NaOH to clear. After that I dilute 1:1 with a 2x concentrated
buffer of choice, e.g. PBS.
Peter
========================================
Peter van de Plas
AURION
Costerweg 5
6702 AA Wageningen
The Netherlands
phone: (31)-317-497676
fax: (31)-317-415955
http://www.aurion.nl
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