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Quasar® Dyes


Biosearch Technologies' series of Quasar® dyes are direct, cost-effective replacements for the Cy™3, Cy5 and Cy5.5 dyes. Quasar 570, Quasar 670 and Quasar 705, with emission maxima at 570, 670 and 705 nm, respectively, are available in a variety of formats to suit your needs. Dye-CPG and phosphoramidites are available for labeling nucleic acids. These reactive forms allow the Quasar dyes to be incorporated during oligo synthesis, which results in more efficient label incorporation and fewer purification steps than post-synthesis labeling.

The Quasar dyes are efficiently quenched by BHQ®-2 and can be used in many different probe formats. Multiplex suggestions and PCR instrument compatibility of Quasar dyes can be found at our multiplex qPCR webpage.

Cyanine dyes are often used as protein and peptide labels and we therefore offer water soluble Quasar carboxylic acids and succinimidyl esters versions as well.

Quasar Dye Properties

LabelAbs Max
Em Max
Dye Replaced
Quasar 570
548 nm566 nmCy™ 3
Quasar 670647 nm670 nmCy 5
Quasar 705690 nm705 nmCy 5.5

Download our Black Hole Quencher and Dye Selection Chart for more details about other offered dyes.

See Also: Black Hole Quencher® Dyes | CAL Fluor® Dyes | Pulsar® 650 Dyes
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