Home » Reactive Dyes » QSY7 Quencher, Succinimidyl Ester


QSY7 Quencher, Succinimidyl Ester


QSY7 quencher succinimidyl ester is a nonfluorescent acceptor dye for preparation of peptide and oligonucleotide FRET probes.


  • Fluorescence quantum yields <0.001 in aqueous solution;
  • Absorption spectra of the conjugates are insensitive to pH between 4 and 10;
  • Efficient quenching of the fluorescence emission of donor dyes including blue-fluorescent coumarins, green- or orange-fluorescent dyes, and red-fluorescent dye conjugates;
  • Quenching of most green and red fluorophores is more effective at far greater distances than is possible with dabcyl quenchers.


Reactivity: Primary amine
Abs maximum: 560 nm
Extinction coefficient: 90,000 cm-1M-1
Solubility: DMSO, DMF
Molecular Formula: C43H39ClN4O7S
Molecular Weight: 791.32
CAS Number: 304014-12-8
Storage Conditions: -20 ℃, protect from light
Shipping Condition: Room Temperature



FRET probe.

To order

Buy Cat.No. Product name Size Price
C100 QSY7 Quencher, SE 5 mg $175


Datasheet (PDF): C100


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