FAM NHS ester, 6-isomer

Cat. # Quantity Price Lead time
15120 1 mg $110.00 in stock
25120 5 mg $160.00 in stock
45120 25 mg $210.00 5 days
55120 50 mg $270.00 in stock
65120 100 mg $420.00 in stock

Fluorescein (FAM) is a bright fluorophore that has found an extremely wide application in life science research. The fluorophore is hydrophilic and its derivatives possess good solubility in aqueous buffers.

Fluorescein is compatible with a wide variety of fluorescent instrumentation - most instruments are equipped with FAM channel filters.

This product contains the pure 6-isomer of fluorescein.

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FAM amine, 5-isomer

Amino derivative of fluorescein, pure 5-isomer. Contains a linker arm between the aliphatic amine group, and the fluorophore. Useful for the labeling via enzymatic transamination, for the reactions with electrophilic reagents, and for reductive amination.

BDP FL NHS ester

Amino-reactive BDP FL, a very bright and photostable dye for fluorescein channel.
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Sulfo-Cyanine5 carboxylic acid

Water-soluble Cyanine5 carboxylic acid, non-activated fluorescent dye.

General properties

Appearance: yellow crystalline solid
Mass spec M+ increment: 358.0
Molecular weight: 473.39
CAS number: 92557-81-8
Molecular formula: C25NO9H15
IUPAC name: (2,5-dioxopyrrolidin-1-yl) 3',6'-dihydroxy-1-oxospiro[2-benzofuran-3,9'-xanthene]-5-carboxylate
Solubility: good in DMF, DMSO
Quality control: NMR 1H, HPLC-MS (95%)
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 maximum, nm: 494
ε, L⋅mol−1⋅cm−1: 75000
Emission maximum, nm: 520
Fluorescence quantum yield: 0.9
CF260: 0.20
CF280: 0.17

Product citations

  1. Evans, L.E.; Jones, K.; Cheeseman, M.D. Targeting secondary protein complexes in drug discovery: studying the druggability and chemical biology of the HSP70/BAG1 complex. Chemical Communications, 2017, 53(37), 5167–5170. doi: 10.1039/c7cc01376k
  2. Warminski, M.; Sikorski, P.J.; Warminska, Z.; Lukaszewicz, M.; Kropiwnicka, A.; Zuberek, J.; Darzynkiewicz, E.; Kowalska, J.; Jemielity, J. Amino-functionalized 5' cap analogs as tools for site-specific sequence-independent labeling of messenger RNA. Bioconjugate Chemistry, 2017, 28(7), 1978–1992. doi: 10.1021/acs.bioconjchem.7b00291
  3. Horning, D.P.; Joyce, G.F. Amplification of RNA by an RNA polymerase ribozyme. Proceedings of the National Academy of Sciences of the United States of America, 2016, 113(35), 9786–9791. doi: 10.1073/pnas.1610103113
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