FAM phosphoramidite, 5-isomer

Cat. # Quantity Price Lead time
2639-500mg 500 mg –   in stock
2639-1g 1 g $190 in stock
2639-5g 5 g $740 in stock
2639-10g 10 g $1290 in stock
2639-50g 50 g please inquire 21 days
2639-100g 100 g please inquire 21 days
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Standard fluorescein (FAM) phosphoramidite for 5'-terminal oligonucleotide labeling, high isomeric purity single isomer. This highly purified amidite reagent ensures excellent coupling results with various synthesizers.

Samples and special offers are available for oligo manufacturers. Contact us for bulk supplies of this reagent.

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: 147566-42-5
Molecular formula: C46H58N3O10P
Solubility: Good solubility in acetonitrile and DCM
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: 72000
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.; Markov, O. V.; Zhukov, S. A.; Khodyreva, S. N.; Kupryushkin, M. S. Influence of Combinations of Lipophilic and Phosphate Backbone Modifications on Cellular Uptake of Modified Oligonucleotides. Molecules, 2024, 29(2), 452. doi: 10.3390/molecules29020452
  2. Bauer, I.; Ilina, E.; Zharkov, T.; Grigorieva, E.; Chinak, O.; Kupryushkin, M.; Golyshev, V.; Mitin, D.; Chubarov, A.; Khodyreva, S.; Dmitrienko, E. Self-Penetrating Oligonucleotide Derivatives: Features of Self-Assembly and Interactions with Serum and Intracellular Proteins. Pharmaceutics, 2023, 15(12), 2779. doi: 10.3390/pharmaceutics15122779
  3. Petrunina, N.A.; Lebedev, V.V.; Kirillova, Y.G.; Aralov, A..V.; Varizhuk, A.M.; Sardushkin, M.V. DNA Intercalated Motifs with Non-Nucleoside Inserts. Russian Journal of Bioorganic Chemistry, 2021, 47(6), 1341–1344. doi: 10.1134/S1068162021060212
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