97512-83-9

S-Nitrosylation reactions regulate protein function and mediate nitrosative stress. S-Phenylsulfonylcysteine is a reagent for blocking thiol (-SH) groups on proteins and peptides at room temperature. This is the first step of the thiosulfonate switch technique, in which thiosulfonates are fluorescently tagged with a probe bearing a reactive thiol, such as rhodamine-SH.