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.

Spectrum

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Product family

Name	Excitation (nm)	Emission (nm)	Extinction coefficient (cm ^-1 M ^-1)	Quantum yield	Correction Factor (260 nm)	Correction Factor (280 nm)
XFD488 NHS Ester Same Structure to Alexa Fluor™ 488 NHS Ester	499	520	71000	0.92¹	0.30	0.11
XFD350 NHS Ester Same Structure to Alexa Fluor™ 350 NHS Ester	343	441	19000	-	0.25	0.19
XFD532 NHS Ester Same Structure to Alexa Fluor™ 532 NHS Ester	534	553	81000	0.61¹	0.24	0.09
XFD594 NHS Ester Same Structure to Alexa Fluor™ 594 NHS Ester	590	618	90000	0.66¹	0.43	0.56
QXY21 NHS ester [equivalent to QSY-21 NHS ester]	-	-	89000¹	-	-	0.32
XFD555 NHS Ester Same Structure to Alexa Fluor™ 555 NHS Ester	553	568	150000	0.1¹	0.08	0.08
XFD647 NHS Ester Same Structure to Alexa Fluor™ 647 NHS Ester	650	671	239000	0.33¹	0.00	0.03
XFD680 NHS Ester Same Structure to Alexa Fluor™ 680 NHS Ester	681	704	184000	0.36¹	0.00	0.05
XFD700 NHS Ester Same Structure to Alexa Fluor™ 700 NHS Ester	696	719	192000	0.25¹	0.00	0.07
XFD750 NHS Ester Same Structure to Alexa Fluor™ 750 NHS Ester	752	776	240000	0.12¹	0.00	0.04
Cy5DIGE NHS ester	651	670	250000¹	0.27¹, 0.4²	0.02	0.03
Cy2DIGE NHS ester	492	508	150000	0.120	0.08	0.15
Cy3DIGE NHS ester	555	569	150000¹	0.15¹	0.07	0.073
XFD546 NHS Ester Same Structure to Alexa Fluor™ 546 NHS Ester	561	572	112000	0.79¹	0.21	0.12
XFD568 NHS Ester Same Structure to Alexa Fluor™ 568 NHS Ester	579	603	91300	0.69¹	0.45	0.46
XFD514 NHS Ester Same Structure to Alexa Fluor™ 514 NHS Ester	518	543	80000	-	0.31	0.18
Cy3B NHS ester	560	571	120000¹	0.58¹	0.048	0.069
XFD405 NHS Ester [equivalent to Alexa Fluor™ 405 NHS Ester]	401	421	35,000	-	0.23	0.70
CypHer5E NHS Ester	643	660	-	-	-	-
CypHer7E NHS Ester	748	769	-	-	-	-
XFD660 NHS Ester [equivalent to Alexa Fluor® 660 NHS Ester]	663	691	132000	-	0.00	0.10
XFD430 NHS ester	432	540	15,000	-	-	0.28
Show More (13)

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

Page updated on October 24, 2024

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Catalog Number	2038
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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)	90000¹

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