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DABCYL-Suc-CPG Column (5'-DMT-mdC(TEG-DABCYL)-Suc-CPG)

DABCYL-Suc-CPG Column (5'-DMT-mdC(TEG-DABCYL)-Suc-CPG)

DABCYL-Suc-CPG Column (5'-DMT-mdC(TEG-DABCYL)-Suc-CPG), 500 Å, 1 µmol, Standard

CPG column used to 3'-label an oligonucleotide with the dabcyl quencher moiety.

Key features

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  • Used to add a yellow-green fluorescent quencher to the 3' end of an oligonucleotide.
  • Emission range at 400-550 nm (absorption maximum, 471 nm). Alternative to BHQ-1 in certain applications.
  • 500 Å CPG suitable for high yield applications such as therapeutic oligos (≤ 30mers).
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Item ID CG5-5025S-1
TBD
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Product information

Dabcyl is a non-fluorescent molecule, (so-called dark quencher) efficiently quenching various fluorescent dyes. It has been widely used as a quencher in diagnostic probes such as Molecular Beacons.(1) A Molecular Beacon is a hybridisation probe consisting of a fluorophore, a quencher and a defined section of the oligonucleotide sequence complementary to that of the target nucleic acid. In the inactive state, when the probe is not hybridised to its target sequence, the fluorescence energy of the fluorophore is transferred to the quencher by a process of collisional quenching. For light energy transfer to take place efficiently, both fluorophore and quencher have to be in close proximity. This requirement is accounted for in the design of Molecular Beacons in that the two parts of the stem hybridise to hold the F/Q pair in close proximity. Hybridisation of the Molecular Beacon probe to its target sequence results in the separation of the stem and hence the F/Q pair, resulting in fluorescence. We offer a variety of CPG and phosphoramidite Dabcyl products for myriad applications.

Since Dabcyl is stable to oligo synthesis it can be incorporated at any point in the sequence. 5’ modification is used in TwistAmp fpg probes; 3’ modification in Taqman probes, duplex Scorpions and Molecular Beacons; and internal modification has been utilised in Scorpion Primers. Deprotection of the oligo is dependent on the F/Q pair but in general is as per unmodified oligos. Dabcyl’s absorption properties limit the range of dyes it can quench to those emitting at 400-550 nm such fluorescein and JOE (absorption maximum, 471 nm), but tends to overlap poorly with fluorophores emitting above 480 nm. However, when used in Molecular Beacons, the fluorophore and Dabcyl are brought close enough to allow a slightly broader spectrum of dyes to be quenched, thereby increasing the versatility of the Dabcyl molecule. Although Dabcyl was originally the quencher of choice, for the most part this has been superceded by Black Hole Quenchers (BHQs) for newer applications.

Ref:

  1. Molecular beacons: probes that fluoresce upon hybridisation, S. Tyagi and F.R. Kramer, Nature Biotechnology, 14, 303-308, 1996.
Synthesizer
Column
Type/Description
Notes
MerMade 6,12
MerMade, syringe (all scales)
Pipette type column
A MerMade column is also known as a Supercolumn
MerMade 4, 48X, 96E, 192E, 192X
MerMade, Syringe (up to 1.3 mL)
Pipette type column
A MerMade column is also known as a Supercolumn
ABI 384 / 394
Luer
Barrel column with luer fitting at either end
Also known as ALL-FIT or Standard
Expedite 8909
Luer
Barrel column with luer fitting at either end
Also known as ALL-FIT or Standard
ABI3900
MerMade
Pipette type column
A MerMade column is also known as a Supercolumn
K&A H4, H8, H8SE, H2, H32, H64
Luer
Barrel column with luer fitting at either end
Also known as ALL-FIT or Standard
K&A S4CL/S8CL
Luer
  Barrel column with luer fitting at either end 
 Also known as Standard. For this instrument, we recommend the Luer (Standard) column as the ALL-FIT columns have a wider barrel.
Dr Oligo 48
MerMade
Pipette type column
A MerMade column is also known as a Supercolumn
 Dr Oligo 192XLc, 768XLc just plates 
 MerMade, Syringe (up to 1.3 mL) 
Pipette type column
A MerMade column is also known as a Supercolumn
 OligoMaker X12, 48, 192, X192, X96 
MerMade, Syringe (up to 1.3 mL)
Pipette type column
A MerMade column is also known as a Supercolumn

Properties:

  • Appearance: orange powder
  • Absorption Maximum (Lambda Max): 472
  • Extinction Coefficient at Lambda max: 32000
  • Extinction Coefficient at 260 nm: 14333

Product usage:

  • Cleavage conditions: Use concentrated ammonia for 90 minutes at 25 °C.
  • Deprotection conditions: If using fast deprotecting amidites (eg. C-Ac, G-DMF, G-PAC)) deprotect in concentrated NH4OH for 1 hour at 60 °C. For standard amidites (eg. C-Bz, G-iBu) deprotect in concentrated NH4OH for 5 hours at 60 °C. If using base sensitive fluorophores (ie. TAMRA or Rhodamine based dyes) we recommend deprotecting oligonucleotide in t-butylamine/H2O (1:3) for 12 hours at 60 °C
  • The mass this product adds after conjugation and work-up (the additional mass seen by mass spectrometry) is: 757.77

Storage and handling:

  • Shipping conditions: Ambient
  • Storage conditions: -15 to -30 °C in sealed container

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