EQ1 quencher can be incorporated at any position within an Oligonucleotide. This quencher has a broad visible absorption but no detectable fluorescence emission making this quencher an useful acceptor in FRET appplications. This quencher can pair with reporter dyes such as FAM, Cy2, TET, JOE, VIC, HEX, Cy3, NED, TAMRA, Cy3.5, ROX, Texas Red, Quasar® 570, CAL Fluor® Gold 540, CAL Fluor® Orange 560, CAL Fluor® Red 590, CAL Fluor® Red 610, Alexa Fluor® 430, Alexa Fluor® 488, Alexa Fluor® 532, Alexa Fluor® 546, Alexa Fluor® 555, Alexa Fluor® 568, Alexa Fluor® 594, DyLight® 488, DyLight® 550, DyLight® 594, ATTO 488, ATTO 520, ATTO 532, ATTO Rho6G, ATTO 550, ATTO 565, ATTO Rho11, ATTO 590, ATTO 594.

A primary amine modified oligonucleotide is used to covalently attach the EQ1 quencher via NHS conjugation chemistry; other cross-linking chemistries are also available depending on particular project specifications. Dual HPLC purification is used to remove failure sequences during first HPLC purification,  after labeling, the second HPLC is performed to remove unlabeled oligonucleotides and excessive dye in order to obtain a full length labeled oligonucleotide.

Product Information


Product Name:

EQ1 Quencher Oligonucleotide Modification



Modification Code:


Exact Mass:


Absorption λmax:

535 nm

Emission (nm):


Extinction Coefficient, ε(λ):

39,200 M-1cm-1


Bio-Synthesis Inc. Oligo Structure



Delivery Format:

Lyophilized, Protect from light

Shipping Conditions:

Room Temperature

Storage Conditions:

-20°C To -70°C
Oligonucleotides are stable in solution at 4°C for up to 2 weeks. Properly reconstituted material stored at -20°C should be stable for at least 6 months. Dried DNA (when kept at -20°C) in a nuclease-free environment should be stable for years.