Thiol determination by DTNB and detergents
stemcells at noaddress.none
Sun Feb 1 15:06:21 EST 2004
"SB" <biswas.16 at osu.edu> wrote:
> Does anyone know what effect detergents (eg: SDS at 10 or 15%) have on
> the measurement of thiol concentration using DTNB?
I would guess none after checking PubMed with the search "DTNB AND SDS AND
interference" and coming up with 0 items.
But if it's really a worry for you, there are ways of precipitating excess
SDS in solution merely by adding potassium salts (K-SDS is insoluble, as I
recall), mixing, probably at cold temperatures, spinning it out and getting
Assay a sample of your thiol-containing material (protein?) with the excess
SDS present and a sample in which you've tried to remove the excess, and
compare the results (do replicates at two or three levels for getting a
good assessment of potential negative interferences). Your question on
interference will then be answered.
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