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2,2'-dithiobis(N-(2-nitrophenyl)aniline), also known as 2,2'-Dithiobis(N-(2-nitrophenyl)aniline) or DTNB, is a chemical compound with the molecular formula C18H14N4O4S2. It is a yellow crystalline solid that is soluble in organic solvents such as ethanol, acetone, and dimethylformamide. DTNB is commonly used as a colorimetric reagent for the determination of thiols, particularly in the Ellman's test, which is a widely employed method for measuring the concentration of free thiol groups in proteins and other molecules. The reaction between DTNB and thiols results in the formation of a colored product, 2-nitro-5-thiobenzoic acid (TNB), which has a maximum absorbance at 412 nm. This property allows for the quantification of thiols in various biological samples, making DTNB a valuable tool in biochemistry and molecular biology research.

5194-16-1

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5194-16-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 5194-16-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,1,9 and 4 respectively; the second part has 2 digits, 1 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 5194-16:
(6*5)+(5*1)+(4*9)+(3*4)+(2*1)+(1*6)=91
91 % 10 = 1
So 5194-16-1 is a valid CAS Registry Number.

5194-16-1Downstream Products

5194-16-1Relevant academic research and scientific papers

The Reduction of Some 2,2'-Dinitrodiaryl Compounds and Related Compounds by Thiourea S,S-Dioxide (Formamidinesulfinic Acid)

Wilshire, John F. K.

, p. 995 - 1001 (2007/10/02)

The reaction of thiourea S,S-dioxide (formamidinesulfinic acid) in ethanolic alkali with 2,2'-dinitrobiphenyl and several related dinitro compounds possessing an-X-bridge (where X = NH, NMe, O and S), located at the 1,1'-positions, has been investigated.With 2,2'-dinitrobiphenyl (which gives good yields of benzocinnoline and its oxides) and, to a minor extent, with 2,2'-dinitrodiphenylamine, an intramolecular reaction occured to give heterocyclic products; with each of the other dinitro compounds, the only product obtained was formed as the result of a Smiles rearrangement.

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