Unit Size
Price (USD)
Cat.#: 1561-1
Unit size: 1 mg
in stock
Cat.#: 1561-5
Unit size: 5 mg
in stock
Cat.#: 1561-25
Unit size: 25 mg
in stock
Cat.#: 1561-100
Unit size: 100 mg
in stock

IR 750 DBCO (IRDye® 750 DBCO equivalent) is a water-soluble, bright, near-IR fluorescent probe that is pH-insensitive from pH 4 to pH 10. Its excitation band is ideally suited for the 633 nm laser lines or dye-pumped laser. IR 750 dye is spectrally similar to other 750 dyes used for flow cytometry, microscopy and other applications. A significant advantage to using long wavelength dyes such as Cy7® Dye or Alexa Fluor® 750 dye over other fluorophores is the low autofluorescence of biological specimens in this region of the spectrum.

IR 750 DBCO is mainly used for imaging of azide-containing biomolecules without the need for copper catalyst. It reacts with azides via a copper-free “click chemistry” reaction to form a stable triazole and does not require Cu-catalyst or elevated temperatures. In applications like staining the surface of live cells or if there are concerns about native protein function loss in the presence of copper IR 750 DBCO is an excellent alternative to copper requiring fluorescent alkynes.

IR 750 DBCO reagent is not suitable for staining intracellular components of fixed and permeabilized cells due to high backgrounds.

Azide, picolyl azide
Abs/Em Maxima
756/776 nm
Extinction coefficient
270,000 cm-1M-1
Water, DMSO, DMF
Spectrally similar dyes
Cy7, Alexa Fluor® 750, IRDye® 750
Molecular weight
Storage conditions
Shipping conditions
Ambient temperature

IRDye® is a trademark of LI-COR Biotechnology.