Atto 665 is a new fluorescent label closely related to Atto 647N. It shows extraordinary high fluorescence quantum yield, excellent thermal and photo-stability, outstanding ozone resistance, and very little triplet formation. Atto 665 is a cationic (charge ⁺¹). The dye is moderately hydrophilic. The maleimide of the dye is suitable for labeling sulfhydryl (thiol) groups of proteins, in particular. Cystein residues. Prepare labeling solution of maleimide-derivative immediately before use by dissolving the vial content in anhydrous and amine-free DMF or DMSO.

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This product is for Research use only. In case of intended commercialization, please contact the IP-holder (ATTO-TEC GmbH, Germany) for licensing.