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Atto 647N NHS ester

BioReagent, suitable for fluorescence, ≥90% (HPLC)

MDL number:

Quality Level

product line



≥90% (HPLC)
≥90% (degree of coupling)




in ethanol (with 0.1% trifluoroacetic acid)

UV absorption

λ: 641-647 nm Amax


suitable for fluorescence

storage temp.


General description

Atto 647N is a superior red-emitting fluorescence dye with a strong absorption, excellent fluorescence quantum yield (65%), high photostability, excellent ozone resistance, good solubility, and very little triplet formation.


Atto 647N belongs to a new generation of fluorescent labels for the red spectral region. The dye is designed for application in the area of life science, e.g. labeling of DNA, RNA or proteins. Characteristic features of the label are strong absorption, excellent fluorescence quantum yield, high photostability, excellent ozone resistance, good solubility, and very little triplet formation. Atto 647N is a cationic dye. The active ester of Atto 647N fluorescence dye reacts with amino groups under mild conditions. After coupling to a substrate the dye carries a net electrical charge of +1. In common with most Atto-labels, absorption and fluorescence are independent of pH in the range of 2 to 11, used in typical applications. As supplied Atto 647N consists of a mixture of two isomers with practically identical absorption and fluorescence properties.

Legal Information

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

Storage Class Code

11 - Combustible Solids



Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificate of Analysis

Certificate of Origin

Ioannis Sgouralis et al.
The journal of physical chemistry. B, 123(3), 675-688 (2018-12-21)
We develop a Bayesian nonparametric framework to analyze single molecule FRET (smFRET) data. This framework, a variation on infinite hidden Markov models, goes beyond traditional hidden Markov analysis, which already treats photon shot noise, in three critical ways: (1) it
Jialei Tang et al.
Scientific reports, 7(1), 10945-10945 (2017-09-10)
We report a simple single-molecule fluorescence imaging method that increases the temporal resolution of any type of array detector by >5-fold with full field-of-view. We spread single-molecule spots to adjacent pixels by rotating a mirror in the detection path during
Shangguo Hou et al.
Nature communications, 11(1), 3607-3607 (2020-07-19)
To date, single molecule studies have been reliant on tethering or confinement to achieve long duration and high temporal resolution measurements. Here, we present a 3D single-molecule active real-time tracking method (3D-SMART) which is capable of locking on to single
Jennifer Z Yao et al.
Journal of the American Chemical Society, 134(8), 3720-3728 (2012-01-14)
Methods for targeting of small molecules to cellular proteins can allow imaging with fluorophores that are smaller, brighter, and more photostable than fluorescent proteins. Previously, we reported targeting of the blue fluorophore coumarin to cellular proteins fused to a 13-amino
Single-molecule STED microscopy with photostable organic fluorophores.
Robert Kasper et al.
Small (Weinheim an der Bergstrasse, Germany), 6(13), 1379-1384 (2010-06-04)

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