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[Nitsirt]

I am trying to generate nuclear extracts from tissue.  Most of the buffers for this protocol contain HEPES, and  I have seen a variety of pHs listed: 7.6, 7.9, and 8.0, with 7.9 being by far the most common.  Does anyone know how sensitive this protocol is to pH and how much variability it will tolerate?

I ask because I just made HEPES, aiming for pH 7.9 and resulting in pH 7.95, and I'm wondering if that's ok.  If not, what acid should I use to adjst the pH down?  I used KOH to increase it.

Also, if anyone has insight into why pH 7.9 is the most desired, I would like to know.

Thank you.

[mikew]

Different protocols use different pH because that is what is on their bench at the time.
I always use pH 7.4. I don't think it matters as long as you are within the 7.4 -8 range.