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iFluor® 665 succinimidyl ester
AAT Bioquest's iFluor® dyes are optimized for labeling proteins, particularly antibodies. These dyes are bright, photostable, and have minimal quenching on proteins. They can be well excited by the major laser lines of fluorescence instruments (e.g., 350, 405, 488, 532, 555, 633, and 647 nm). The iFluor® 665 family has spectral properties similar to those of Alexa Fluor® 660 (Alexa Fluor® is the trademark of Invitrogen). In addition, the fluorescence of iFluor® 665 is pH-insensitive over a broad range, pH 3-11. These spectral characteristics make this new dye family an excellent alternative to Alexa Fluor® 660. Under the same conditions, iFluor® 665 gives a stronger fluorescence signal on some antibodies we tested. iFluor® 665 SE is reasonably stable and shows good reactivity and selectivity with protein amino groups.
product image
product image
CatalogSize
Price
Quantity
1550100 ug
Price
15511 mg
Price
15525 mg
Price
155310 mg
Price
 
Physical properties

Molecular weight1210.53
SolventDMSO
Spectral properties

Absorbance (nm)661
Correction factor (260 nm)0.12
Correction factor (280 nm)0.09
Extinction coefficient (cm -1 M -1)
110,000
1
Excitation (nm)667
Emission (nm)692
Quantum yield
0.22
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 8, 2025