Thiolmono-reactiveCyanine3dye.ThisreagentcanbeusedtoattachCyanine3fluorophore(ananalogofCy3®)toproteinsandpeptidescontainingcysteineresidues,aswellastootherthiolatedmolecules(suchasthiol-containingoligonucleotides).
CystinesshouldbereducedwithTCEP(tris-carboxyethylphosphine)orotherappropriatereductantpriortothelabeling.
LabelingwithCyanine3maleimideisselective,andefficient.
Werecommendusingwater-solubleSulfo-Cyanine3maleimideforthelabelingofantibodiesandothersensitiveproteins.
Generalproperties
| Appearance: | redpowder | 
| Molecularweight: | 615.20 | 
| Molecularformula: | C36H43ClN4O3 | 
| Solubility: | solubleinorganicsolvents(DMF,DMSO,dichloromethane),insolubleinwater | 
| Qualitycontrol: | NMR1H,HPLC-MS(95%) | 
| Storageconditions: | Storage:24monthsafterreceivalat-20°Cinthedark.Transportation:atroomtemperatureforupto3weeks.Avoidprolongedexposuretolight.Desiccate. | 
Spectralproperties
| Excitationmaximum,nm: | 555 | 
| ε,L⋅mol−1⋅cm−1: | 150000 | 
| Emissionmaximum,nm: | 570 | 
| Fluorescencequantumyield: | 0.31 | 
| CF260: | 0.04 | 
| CF280: | 0.09 |