FAM NHS ester, 6-isomer，羧基荧光染料 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.   General properties： Appearance: yellow crystalline solid Mass spec M+ increment: 358.0 Molecular weight: 473.39 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. FAM NHS ester, 6-isomer，羧基荧光染料   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