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Reference.org
Ellman's reagent
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<p>Ellman's reagent (5,5′-dithiobis-(2-nitrobenzoic acid) or DTNB) is a <a href="/facts/Colorogenic/paTvfJkq">colorogenic</a> chemical used to quantify the number or concentration of <a href="/facts/Thiol/VemKEDP9">thiol</a> groups in a sample. It was developed by George L. Ellman. </p>