SH internal Ellman's Reagent CO₂H disulfide crosslink O₂N- HO₂C solvent- exposed thiol UV Absorbance at 412 nm O₂N- O₂C TNB2- alkaline pH + O₂N- -SH 2-nitro-5-thiobenzoate (TNB) -NO₂ mixed disulfide CO₂H a) Provide a detailed arrow-pushing mechanism for the reaction of a thiol (you can use R-SH) with Ellman's reagent to produce a mixed disulfide and TNB. Ellman's Reagent CO₂H S -NO2 - R-SH + O₂N- S HO₂Cmo CO₂H S + NO2 O₂N- SH R-S HO₂C Mixed disulfide TNB

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Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.