Fura-FF (potassium salt)

Fura-FF is a difluorinated derivative of the calcium indicator fura-2 (Cay-19531, Cay-20414). Unlike, fura-2, fura-FF has negligible magnesium sensitivity, thus reducing interference from this cation. Fura-FF also has a higher calcium dissociation constant than fura-2 (Kd(calcium) = 6 and 0.14 µM, respectively). However, the spectral properties of fura-FF and fura-2 are similar with fura-FF displaying excitation/emission spectra of 365/514 nm in the absence of calcium, with a shift to 339/507 nm in the presence of a high calcium concentration. Low affinity calcium dyes, including fura-FF, are preferred for studying compartments with high concentrations of calcium, such as mitochondria, or in cell systems that have relatively low calcium buffering capacities, such as neuronal dendrites and spines.Formal Name: 2-[6-[bis(carboxymethyl)amino]-5-[2-[6-[bis(carboxymethyl)amino]-2,3-difluorophenoxy]ethoxy]-2-benzofuranyl]-5-oxazolecarboxylic acid, pentapotassium salt. CAS Number: 192140-58-2. Molecular Formula: C28H18F2N3O14 . 5K. Formula Weight: 853.9. Purity: >90%. Emission: 514 nm (no Ca2+), 507 nm (high [Ca2+]). Excitation: 365 nm (no Ca2+), 339 nm (high [Ca2+]). Formulation: (Request formulation change), A solid. Solubility: Water: soluble. SMILES: [O-]C(CN(C1=CC2=C(C=C(C3=NC=C(C([O-])=O)O3)O2)C=C1OCCOC(C(F)=C(F)C=C4)=C4N(CC([O-])=O)CC([O-])=O)CC([O-])=O)=O.[K+].[K+].[K+].[K+].[K+]. InChi Code: InChI=1S/C28H23F2N3O14.5K/c29-14-1-2-15(32(9-21(34)35)10-22(36)37)26(25(14)30)45-4-3-44-18-5-13-6-19(27-31-8-20(47-27)28(42)43)46-17(13)7-16(18)33(11-23(38)39)12-24(40)41,,,,,/h1-2,5-8H,3-4,9-12H2,(H,34,35)(H,36,37)(H,38,39)(H,40,41)(H,42,43),,,,,/q,. InChi Key: LZFKAYBOWPHSOE-UHFFFAOYSA-I.