= Ellman's reagent
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= DTNB
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<Ellman's reagent> is 5,5'-dithiobis(2-nitrobenzoic acid), abbreviated <DTNB>, a <disulfide> used to quantify accessible <thiols>. Reaction releases the colored TNB species measured by <absorbance> at <wavelength> $412\,\mathrm{nm}$. The <disulfide bond> experiment above explains why a <thiol> measurement can become an indirect bridge count only after controlled <reduction>. https://assets.thermofisher.com/TFS-Assets/LSG/manuals/MAN0011216_Ellmans_Reag_UG.pdf[Pierce Biotechnology: identity and use of Ellman's reagent]{ref}
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