QXY7 NHS ester [equivalent to QSY-7 NHS ester]

QXY7 NHS ester

equivalent to QSY-7 NHS ester

QXY7 is the same molecule to QSY-7 acid (ThermoFisher). QXY7 has a broad and intense absorption at ~550 nm maxima with no detectable fluorescence, making it useful as an acceptor in fluorescence resonance energy transfer (FRET) applications paring with Cy3, TAMRA, Alexa Fluor 555 and iFluor® 647 or other spectrally similar fluorescent dyes. QXY7 NHS ester is quite stable and readily reacts with amino-containing molecules such as amino-modified oligos, proteins and peptides.

Protocol

SDS

COA

Catalog	Size	Price	Quantity
2038	10 mg	Price

References

View all 11 references: Citation Explorer

[Development of Novel Dark Quenchers and Their Application to Imaging Probes].

Authors:

Hanaoka, Kenjiro

Journal:

Yakugaku zasshi : Journal of the Pharmaceutical Society of Japan (2019): 277-283

A real-time in vitro assay to evaluate the release of macromolecules from liposomes.

Authors:

Mujoo, Himang and Reynolds, John N J and Tucker, Ian G

Journal:

Drug testing and analysis (2018): 1025-1032

Structural exploration and Förster theory modeling for the interpretation of gas-phase FRET measurements: Chromophore-grafted amyloid-β peptides.

Authors:

Kulesza, Alexander and Daly, Steven and MacAleese, Luke and Antoine, Rodolphe and Dugourd, Philippe

Journal:

The Journal of chemical physics (2015): 025101

Action-FRET: probing the molecular conformation of mass-selected gas-phase peptides with Förster resonance energy transfer detected by acceptor-specific fragmentation.

Authors:

Daly, Steven and Poussigue, Frédéric and Simon, Anne-Laure and MacAleese, Luke and Bertorelle, Franck and Chirot, Fabien and Antoine, Rodolphe and Dugourd, Philippe

Journal:

Analytical chemistry (2014): 8798-804

Reversible off-on fluorescence probe for hypoxia and imaging of hypoxia-normoxia cycles in live cells.

Authors:

Takahashi, Shodai and Piao, Wen and Matsumura, Yuriko and Komatsu, Toru and Ueno, Tasuku and Terai, Takuya and Kamachi, Toshiaki and Kohno, Masahiro and Nagano, Tetsuo and Hanaoka, Kenjiro

Journal:

Journal of the American Chemical Society (2012): 19588-91

Physical properties

Molecular weight	791.32
Solvent	DMSO

Spectral properties

Absorbance (nm)	561
Correction factor (280 nm)	0.22
Extinction coefficient (cm ^-1 M ^-1)	90000 ¹

Storage, safety and handling

H-phrase	H303, H313, H333
Hazard symbol	XN
Intended use	Research Use Only (RUO)
R-phrase	R20, R21, R22
Storage	Freeze (< -15 °C); Minimize light exposure
UNSPSC	12171501

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Page updated on October 15, 2025