Home | Products | Oligo Technology | Fluorescent Probes | Modifications | Oligo Design Tools | Online Order

Oligo Modifications List | Oligo Modifications Reference Category
Modification : Fluorescein
Reference Catalog Number 26-6426
Category Fluorescent Dyes
Modification Code Fl
5 Prime Y
3 Prime Y
Internal N
Molecular Weight (mw) 537.46
Extinction Coeficient (ec) 31.5
Technical Info (pdf) PS26-6426.pdf
Abvsorbance MAX 494
Emission MAX 521
Catalog NoScalePrice
26-6426-0550 nmol$63.00
26-6426-02200 nmol$63.00
26-6426-011 umol$81.90
26-6426-032 umol$122.85
26-6426-1010 umol$655.50
26-6426-1515 umol$819.00

Discounts are available for Fluorescein!
Modification* Discount Price Structure
1 site/order List price
2 sites/order 10% discount
3 sites/order 20% discount
4 sites/order 30% discount
5-9 sites/order 50% discount
10+ sites/order 60% discount
*Exceptions apply

Related Modifications
Cy3
FAM (6-FAM)
Cy5.5
Fam-NHS (6-Fam NHS)
Cy3.5
FAM-TEG Azide
HEX
Cy5
Fluorescein dT

Fluorescein is the most commonly used fluorescent dye for labeling oligonucleotides. Fluorescein has an absorbance maximum of 494 nm and an emission maximum of 521 nm. The difference between the fluorescein and 6-FAM modifications is that here the fluorescein dye is attached to the 6-carbon spacer via an N-hydroxysuccinimide (NHS) group instead of a carboxy group. Fluorescein plays a particularly important role in real-time PCR applications, being used as a reporter moiety in TaqMan probes (1), Scorpion primers (2) and Molecular Beacons (3). For such probes, fluorescein is most commonly paired with the dark quencher BHQ-1, as the two have excellent spectral overlap.

Fluorescein can be used to label DNA oligos for use as hybridization probes in a variety of in vivo and in vitro research or diagnostic applications, as well as for structure-function studies of DNA, RNA, and protein-oligonucleotide complexes. Oligos labeled with fluorescein at the 5’-end can be used as PCR and DNA sequencing primers to generate fluorescently-labeled PCR, sequencing or genetic analysis (AFLP or microsatellite) products.

References
1. Livak, K.J., Flood, S.J.A., Marmaro, J., Giusti, W., Deetz, K. Oligonucleotides with fluorescent dyes at opposite ends provide a quenched probe system useful for detecting PCR product and nucleic acid hybridization.PCR Methods Appl. (1995), 4: 1-6.
2. Thelwell, N., Millington, S., Solinas, A., Booth, J., Brown, T. Mode of action and application of Scorpion primers to mutation detection. Nucleic Acids Res. (2000), 28: 3752-3761.
3. Tyagi, S., Kramer, F.R. Molecular beacons: probes that fluoresce upon hybridization. Nat. Biotechnol. (1996), 14: 303-308.
Email
Question

Enter the letters you see above for verification:
Order Status | Customer Service | Site Map | Request Literature | About e-oligos | Contact Us |   Search
May 21, 2019 e-oligos(tm) is a brand of Gene Link. e-oligos(tm) and the binary helix(tm) All graphic art is a trade mark of Gene Link, Inc. Copyright 2019
    Terms and Conditions    Licenses    Privacy Policy