[Histonet] hepes instead of cacodylate
tora.bardal <@t> bio.ntnu.no
Thu Apr 19 15:43:04 CDT 2012
I'm trying to switch from cacodylate buffer to Hepes in my EM-fixative.
PBS buffer is not an option.
My fixative contains sucrose, CaCl2, 2,5 % formaldehyde and 2,5% GA in
addition to cacodylate (later Hepes). Formaldehyde is "homemade" stock
25 % (no methanol)
After storage for some time in Hepes fixative I see a
turbidity/precipitate. Stored fixative with precipitate and newly mixed
fixative gave the same pH.
Another group who made this Hepes fixative after my recipe told me they
got precipitate once they mixed in the GA.
What have I missed here when it comes to chemicals and reactions?
Any good protocols out there?
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