M Beacon 5' Cy®5 3' BHQ-2® - 1 probe

Price on request
  • Cat.Number : PB-MB655-004
  • Availability :
    In production

Synthesis scale

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Molecular Beacons are probes which contain a stem-loop structure, a fluorophore and a quencher at their 5’ and 3’ ends, respectively.

Eurogentec is a licensed supplier of Molecular Beacons, and offers a large number of fluorescent reporters and quenchers. All Molecular Beacons are provided double-HPLC purified and controlled by analytical HPLC and MALDI-TOF MS. The maximum length of standard Molecular Beacons is 45 bases. Molecular Beacons are provided lyophilized in individual tubes.

Eurogentec determines upon request the signal-to-noise ratio (STNR) for each Molecular Beacons by hybridizing it to its complementary sequence and comparing fluorescence to background. For FAM labelled Molecular Beacons, the STNR should be > 15. All other dyes require a signal-to-noise ratio > 10.
How do the Molecular Beacons work?
The ‘stem’ sequence keeps the fluorophore and the quencher together, but only in the absence of a sequence complementary to the ‘loop’ sequence. As long as the fluorophore and the quencher are in close vicinity, any photons emitted by the fluorophore are absorbed by the quencher. This phenomenon is called collisional (or proximal) quenching.

In the presence of a complementary sequence, the probe unfolds and hybridizes to the target, the fluorophore is displaced from the quencher, which can no longer absorb the photons emitted by the fluorophore, and the probe starts to fluoresce. The amount of signal is proportional to the amount of target sequence, and is measured in Real-Time to allow quantification of the amount of target sequence.

Cy® 5 - Absorbance = (625), 650 nm, Emission = 670 nm

BHQ-0™ : Quenching range [430-520]nm; Max : 495 nm
BHQ-1™ : Quenching range [480-580]nm; Max : 534 nm
BHQ-2™: Quenching Range [550-650]nm; Max : 579 nm
BHQ-3™: Quenching Range [620-730]nm; Max : 680 nm


Absorbance (nm)
  • (625); 650
Emission (nm)
  • 670
Quantity & Purity
Purification Method
Storage & stability
  • Lyophilized
Resuspension condition
  • - Spin the tube briefly to collect the pellet in the bottom of the tube - Add an appropriate volume of recommended buffer (refer to technical data sheet) - Allow the tube to stand a few minutes - Vortex the tube for 15 seconds
Storage Conditions
  • Dried Oligonucleotides are stable for 18 months at ambiant temperature. Oligonucleotides in solutions are stable for 24 months at -20°C. (Tolerance -20°C± 5°C. ) Probes should be protected from light For more information please refer to the Reconstitution-Storage-Stability page
  • Research use
Code Nacres
  • NA.51

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