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XFD680 PEG4 DBCO
XFD680 PEG4 DBCO is an azide-reactive, deep red fluorescent dye with an excitation/emission of 681/704 nm that is used for flow cytometry and microscopy applications.
  • Superior Fluorescence Performance: High quantum yield, exceptional photostability, and pH-independent fluorescence across pH 4–11.
  • Copper-Free Bioorthogonal Labeling: Enables rapid and efficient azide conjugation via copper-free SPAAC
  • High Water-Solubility: Prevents aggregation and enhances signal clarity for advanced imaging and live-cell applications
Schematic illustrating the strain‐promoted azide–alkyne cycloaddition (SPAAC) between a dibenzocyclooctyne (DBCO)–dye conjugate and an azide‐modified biomolecule. The DBCO’s ring strain drives the copper‐free reaction with the azide to form a stable 1,2,3-triazole linkage, avoiding potential toxicity of copper catalysts. This bioorthogonal labeling strategy proceeds efficiently under mild conditions, making it especially valuable for live‐cell imaging, in vivo studies, and other sensitive bioconjugation applications.
Schematic illustrating the strain‐promoted azide–alkyne cycloaddition (SPAAC) between a dibenzocyclooctyne (DBCO)–dye conjugate and an azide‐modified biomolecule. The DBCO’s ring strain drives the copper‐free reaction with the azide to form a stable 1,2,3-triazole linkage, avoiding potential toxicity of copper catalysts. This bioorthogonal labeling strategy proceeds efficiently under mild conditions, making it especially valuable for live‐cell imaging, in vivo studies, and other sensitive bioconjugation applications.
CatalogSize
Price
Quantity
701061 mg
Price
 
Physical properties

SolventDMSO
Spectral properties

Correction factor (260 nm)0.00
Correction factor (280 nm)0.05
Extinction coefficient (cm -1 M -1)
184000
Excitation (nm)681
Emission (nm)704
Quantum yield
0.36
1
Storage, safety and handling

H-phraseH303, H313, H333
Hazard symbolXN
Intended useResearch Use Only (RUO)
R-phraseR20, R21, R22
StorageFreeze (< -15 °C); Minimize light exposure
UNSPSC12171501
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Page updated on October 9, 2025