Crystals during X-gal staining
bsh at MED.PITT.EDU
Thu Apr 21 16:35:28 EST 1994
> I have been using X-gal to stain cells blue after transient tranfections.
> The cells are blue allright but there are lots of crystals in the stain so
> the results are not very photogenic. The problem seems to arise when the
> X-gal stock (10% in DMF, frozen at -20 C) is diluted 1:100 in the working
> buffer for staining (5mM K ferricynanide, 5mM K ferrocyanide, 2 mM MgCl2,
> made up in PBS). As soon as the X-gal hits the aqueous buffer the
> solution goes cloudy.
> Does anyone know how to prevent this? Am I stuck with filtering?
> Allison Haggarty
Sometime back there was an article in BioTechniques describing
the use of DMSO as a solvent for X-gal instead of DMF. I know that
DMSO is much more miscible with water than DMF. I think that might
solve your problem.
bsh at med.pitt.edu
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