FAM NHS ester, 6-isomer

Cat. # Quantity Price Lead time
25120 5 mg –   in stock
45120 25 mg $140.00 in stock
55120 50 mg $240.00 in stock
65120 100 mg $370.00 in stock
85120 1 g please inquire in stock
95120 5 g please inquire 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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DMF (dimethylformamide), labeling grade

Dry high purity amine free solvent for NHS ester labeling.

Cyanine5 NHS ester

Amine-reactive Cyanine5 activated ester for the labeling of proteins, peptides, and other molecules.

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/absorption 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. Sasaki, K.; Harada, M.; Yoshikawa, T.; Tagawa, H.; Harada, Y.; Yonemitsu, Y.; Ryujin, T.; Kishimura, A.; Mori, T.; Katayama, Y. Fc-Binding Antibody-Recruiting Molecules Targeting Prostate-Specific Membrane Antigen: Defucosylation of Antibody for Efficacy Improvement. ChemRxiv, preprint. doi: 10.26434/chemrxiv.12654602.v1
  2. Zhong, Z.; Deng, X.; Wang, P.; Yu, C.; Kiratitanaporn, W.; Wu, X.; Schimelman, J.; Tang, M.; Balayan, A.; Yao, E.; Tian, J.; Chen, L.; Zhang, K.; Chen, S. Rapid bioprinting of conjunctival stem cell micro-constructs for subconjunctival ocular injection. Biomaterials, 2021, 267, 120462. doi: 10.1016/j.biomaterials.2020.120462
  3. Iurova, E.; Beloblov, I.; Beloborodov, E.; Rastorgueva, E.; Pogodina, E.; Tazintseva, E.; Saenko, Y.; Fomin, A. Use of Natural Peptides with a Cysteine Knot of Arthropods as a Carrier of a Peptide Tropic to Glutamate Carboxypeptidase II. Systematic Reviews in Pharmacy, 2020, 11(9), 503–509. doi: 10.31838/srp.2020.9.73
  4. Pinals, R.L.; Yang, D.; Lui, A.; Cao, W.; Landry, M.P. Corona exchange dynamics on carbon nanotubes by multiplexed fluorescence monitoring. Journal of the American Chemical Society, 2020, 142(3), 1254–1264. doi: 10.1021/jacs.9b09617
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