FAM phosphoramidite, 6-isomer

Oligonucleotide synthesis FAM (Fluorescein) Phosphoramidites
Cat. # Quantity Price Lead time
D5160
/ Easily soluble lyophilised form in 8 mL septum
250 mg
$105
 in stock
F5160
/ Easily soluble lyophilised form in 30 mL septum
1 g
$167
 in stock
G5160 5 g
$740
 in stock
H5160 10 g
$970
 in stock
K5160 50 g
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in stock
L5160 100 g
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FAM (fluorescein) phosphoramidite 6-isomer is specifically designed for incorporation at the 5′-end of oligonucleotides, which is essential for many biochemical assays and applications. It is primarily utilized for labeling oligonucleotides, enhancing their visibility in various assays such as PCR, sequencing and hybridization studies. It is commonly employed in real-time PCR assays where fluorescent signals are monitored during amplification. The incorporation of FAM at the 5′-end allows for efficient monitoring of the reaction progress through fluorescence.

FAM emits fluorescence with a maximal emission wavelength around 517 nm, which is ideal for various detection methods. It can be quenched by agents like DusQ 1 or DABCYL, allowing for applications in assays that require precise control over fluorescence signals.

Internal sequence additions can be achieved using modified nucleotides such as FAM-dT phosphoramidite, allowing for flexible design of probes with multiple fluorescent tags while maintaining effective spacing. However, it is essential to include spacers between the labels to prevent self-quenching of fluorescence signals, which can occur due to close proximity.

The dye soluble in common organic solvents such as acetonitrile, DCM, DMF, DMSO. Once conjugated to biomolecules, the resulting FAM conjugates can be used in aqueous applications.

FAM phosphoramidite, 6-isomer, F5160 / Easily soluble lyophilised form in 30 mL septum
FAM Phosphoramidite, 6-Isomer, D5160
FAM Phosphoramidite, 6-Isomer, D5160
FAM Phosphoramidite, 6-Isomer, D5160
6-FAM phosphoramidite structure
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FAM absorbance and emission spectra

FAM absorbance and emission spectra

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General properties

Appearance: off-white solid
Molecular weight: 843.94
CAS number: 204697-37-0
Molecular formula: C46H58N3O10P
Solubility: acetonitrile, DCM, DMF, DMSO
Quality control: NMR 1H and 31P, HPLC-MS (95+%), isomeric purity > 97%
Storage conditions: Storage: 12 months after receival at -20°C in the dark. Transportation: at room temperature for up to 3 weeks. Avoid prolonged exposure to light. Desiccate.
MSDS: Download
Product specifications

Spectral properties

Excitation/absorption maximum, nm: 492
ε, L⋅mol−1⋅cm−1: 74000
Emission maximum, nm: 517
Fluorescence quantum yield: 0.93
CF260: 0.22
CF280: 0.17

Oligo synthesis details

Diluent: acetonitrile
Coupling conditions: coupling time 10 min
Cleavage conditions: ammonia, 2 h at room temperature
Deprotection conditions: identical to protected nucleobases; when AMA is used, deblock with ammonia alone for 30 min, then add methylamine

Product citations

  1. Zharkov, T.D.; Mironova, E.M.; Markov, O.V.; Zhukov, S.A.; Khodyreva, S.N.; Kupryushkin, M.S. Fork- and Comb-like Lipophilic Structures: Different Chemical Approaches to the Synthesis of Oligonucleotides with Multiple Dodecyl Residues. International Journal of Molecular Sciences, 2023, 24(19), 14637. doi: 10.3390/ijms241914637
  2. Bulgakova, A.; Chubarov, A.; Dmitrienko, E. Magnetic Nylon 6 Nanocomposites for the Microextraction of Nucleic Acids from Biological Samples. Magnetochemistry, 2022, 8(8), 85. doi: 10.3390/magnetochemistry8080085
  3. Stanton, J.-A.L.; O'Brien, R.; Hall, R.J.; Chernyavtseva, A.; Ha, H.J.; Jelley, L.; Mace, P.D.; Klenov, A.; Treece, J.M.; Fraser, J.D.; Clow, F.; Clarke, L.; Su, Y.; Kurup, H.M.; Filichev, V.V.; Rolleston, W.; Law, L.; Rendle, P.M.; Harris, L.D.; Wood, J.M.; Scully, T.W.; Ussher, J.E.; Grant, J.; Hore, T.A.; Moser, T.V.; Harfoot, R.; Lawley, B.; Quiñones-Mateu, M.E.; Collins, P.; Blaikie, R. Uncoupling Molecular Testing for SARS-CoV-2 From International Supply Chains. Frontiers in Public Health, 2022, 9, 808751. doi: 10.3389/fpubh.2021.808751
  4. Zhou, Z.; Liu, S.; Zhang, Y.; Yang, X.; Ma, Y.; Guan, Z.; Wu, Y.; Zhang, L.; Yang, Z. Reductive nanocomplex encapsulation of cRGD-siRNA conjugates for enhanced targeting to cancer cells. International Journal of Nanomedicine, 2017, 12, 7255–7272. doi: 10.2147/ijn.S136726
This Product is offered and sold for research purposes only. It has not been tested for safety and efficacy in food, drug, medical device, cosmetic, commercial or any other use. Supply does not express or imply authorization to use for any other purpose, including, without limitation, in vitro diagnostic purposes, in the manufacture of food or pharmaceutical products, in medical devices or in cosmetic products.
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