Cyanine5maleimideisamono-reactivedyewhichselectivelycoupleswiththiolgroups(forexample,withcysteinesinpeptidesandproteins)togivelabeledconjugates.
Cyanine5isananalogofCy5®,acommonfluorophorewhichiscompatIBLewithvariousinstrumentationlikemicroscopes,imagers,andfluorescencereaders.
Forthelabelingofantibodiesandsensitiveproteinswerecommendtousethewatersolublesulfo-Cyanine5maleimide.
Generalproperties
| Appearance: | darkbluepowder | 
| Molecularweight: | 641.24 | 
| CASnumber: | 1437872-46-2;1437796-65-0 | 
| Molecularformula: | C38H45ClN4O3 | 
| Solubility: | solubleinorganicsolvents(DMF,DMSO,dichloromethane),insolubleinwater | 
| Qualitycontrol: | NMR1H,HPLC-MS(95%) | 
| Storageconditions: | Storage:24monthsafterreceivalat-20°Cinthedark.Transportation:atroomtemperatureforupto3weeks.Avoidprolongedexposuretolight.Desiccate. | 
Spectralproperties
| Excitationmaximum,nm: | 646 | 
| ε,L⋅mol−1⋅cm−1: | 250000 | 
| Emissionmaximum,nm: | 662 | 
| Fluorescencequantumyield: | 0.2 | 
| CF260: | 0.03 | 
| CF280: | 0.04 |