Identifying the sulfenylation state (-SOH) of stressed cells. Here, we optimized an in vivo trapping method of sulfenic acids in hydrogen peroxide (H2O2) stressed plant cells. With click chemistry, the dimedone based alkyne functionalized DYn-2 probe was biotinylated for subsequent streptavidin enrichment of sulfenylated proteins. the DYn-2 modification and DYn-2-Biotin-azide modification were unknown modifications, we therefore chose N-D-glucuronylglycine [MOD00067] and N-palmitoyl-S-(sn-1-2,3-dipalmitoyl-glycerol)cysteine [MOD00444]