FAM maleimide, 6-isomer

Cat. # Quantity Price Lead time
44180 25 mg $160.00 in stock
54180 50 mg $270.00 in stock
64180 100 mg $420.00 in stock

FAM (fluorescein) is a bright fluorophore which is compatible with various fluorescence detection instruments. FAM is a universal dye that is useful for microscopy, qPCR and many other methods as well as for FRET-based and fluorescence polarization based binding assays.

FAM maleimide is a thiol reactive dye for the labeling of proteins, peptides, and other thiolated molecules.

Fluorescein (FAM) absorbance and emission spectra

Fluorescein (FAM) absorbance and emission spectra

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TAMRA maleimide, 6-isomer

TAMRA is a well known xanthene dye of rhodamine series. This is a thiol reactive maleimide for the labeling of SH groups in proteins and peptides. Pure 6-isomer.

ROX NHS ester, 6- isomer

Pure isomer 6-ROX NHS ester for amine labeling.

General properties

Appearance: yellow solid
Mass spec M+ increment: 498.4
Molecular weight: 498.44
Molecular formula: C27H18N2O8
Solubility: good in DMSO, DMF
Quality control: NMR 1H, HPLC-MS (95%)
Storage conditions: Storage: 24 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. Yu, C.; Tang, J.; Loredo, A.; Chen, Y.; Jung, S.Y.; Jain, A.; Gordon, A.; Xiao, H. Proximity-Induced Site-Specific Antibody Conjugation. Bioconjugate Chemistry, 2018, 29(11), 3522–3526. doi: 10.1021/acs.bioconjchem.8b00680
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