QXY7 acid [equivalent to QSY-7 acid]

QXY7 acid

equivalent to QSY-7 acid

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, iFluor® 647 or other spectrally similar fluorescent dyes.

Protocol

SDS

COA

Catalog	Size	Price	Quantity
2037	25 mg	Price

References

View all 14 references: Citation Explorer

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

A time-resolved, internally quenched fluorescence assay to characterize inhibition of hepatitis C virus nonstructural protein 3-4A protease at low enzyme concentrations.

Authors:

Mao, Shi-Shan and DiMuzio, Jillian and McHale, Carolyn and Burlein, Christine and Olsen, David and Carroll, Steven S

Journal:

Analytical biochemistry (2008): 1-8

Fluorescence-based sensing of glucose using engineered glucose/galactose-binding protein: a comparison of fluorescence resonance energy transfer and environmentally sensitive dye labelling strategies.

Authors:

Khan, Faaizah and Gnudi, Luigi and Pickup, John C

Journal:

Biochemical and biophysical research communications (2008): 102-6

Longer wavelength fluorescence resonance energy transfer depsipeptide substrates for hepatitis C virus NS3 protease.

Authors:

Konstantinidis, Alex K and Richardson, Paul L and Kurtz, Kevin A and Tripathi, Rakesh and Chen, Chih-Ming and Huang, Peggy and Randolph, John and Towne, Danli and Donnelly, Jennifer and Warrior, Usha and Middleton, Tim and Kati, Warren M

Journal:

Analytical biochemistry (2007): 156-67

Physical properties

Molecular weight	771.81
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 16, 2025