NaCl and culture medium

Michelle Gleeson michelle at MOLECULE.BIO.UTS.EDU.AU
Wed Apr 29 17:14:46 EST 1998

Hi Ruben,

I don't know about NaCl affecting expression, but there are (at least) 2
recipes for LB media.  One (in Maniatis I think) uses 10g/L NaCl, and the
other (from a Promega protocol for a phage library kit) uses 5g/L.  I've
never found anything that says what the difference is, but I tend to go
for the lower salt concentration, as I think it has to be less stressful
for the bugs.

Michelle Gleeson
Molecular Parasitology Unit              Ph: (02) 9514 4043
University of Technology                 Fax:(02) 9514 4003
Westbourne St Gore Hill, NSW 2065        michelle.gleeson at

On Wed, 29 Apr 1998 ruben.varela-calvino at wrote:

> Hi everybody
> I'm trying to express my recombinant protein using the LB medium with little
> suscess by the moment. Now I'm trying 2xYT and SuperBroth and I realize that
> the amount of NaCl people use here to prepare the LB medium (10 gr/lt) was
> twice of 2xYT/SuperBroth (5 gr/lt), but cells seems to growth without any
> problem
> I have one question: can this affect the production of recombinant
> proteins?
> Ruben
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