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General description
Binding of Ca2+ leads to a major shift in UV absorption spectrum and a twenty-fold enhancement in fluorescence quantum yield. TPEN (Cat. No. 616394) can be used in conjunction with QUIN 2 to reduce heavy-metal quenching of QUIN 2 fluorescence in cells.
Binding of Ca2+ to QUIN 2 leads to a major shift in UV absorption spectrum and a twenty-fold enhancement in fluorescence quantum yield. TPEN (Cat. No. 616394) can be used in conjunction with QUIN 2 to reduce heavy-metal quenching of QUIN 2 fluorescence in cells. Spectral properties in the presence of low calcium concentrations (ex. 354 nm, em. 510 nm) differ from those during high calcium conditions (ex. 332 nm, em. 505 nm).
Biochem/physiol Actions
Cell permeable: no
Primary Target
Calcium Probes
Product does not compete with ATP.
Reversible: no
Preparation Note
Following reconstitution, aliquot and freeze (-20°C) under an inert gas, pH >10. Stock solutions are stable for up to 6 months at -20°C.
Other Notes
Komada, H., et al. 1989. Cell Struct. Funct. 14, 141.
Vijayaraghavan, S. and Hoskins, D. 1989. Cell Calcium10, 241.
Arslan, P., et al. 1985. J. Biol. Chem.260, 2719.
Bryant, D.T. 1985. Biochem. J.226, 613.
Grynkiewicz, G., et al. 1985. J. Biol. Chem.260, 3440.
Ashley R.H., et al. 1984. Biochem. J.219, 149.
Tsien, R.Y., et al. 1982. J. Cell Biol.94, 325.
Tsien, R.Y. 1980. Biochemistry19, 2396.
Legal Information
CALBIOCHEM is a registered trademark of Merck KGaA, Darmstadt, Germany
Disclaimer
Toxicity: Irritant (B)
| Quality Segment | 100 |
| assay | ≥95% (HPLC) |
| form | solid |
| manufacturer/tradename | Calbiochem® |
| storage condition | OK to freeze,protect from light |
| color | yellow |
| solubility | water: 10 mg/mL |
| fluorescence | λex 332 nm (high),λex 354 nm (low),λem 505 nm (high),λem 510 nm (low) |
| shipped in | ambient |
| storage temp. | −20°C |
| SMILES string | [K+].[K+].[K+].[K+].N(CC(=O)[O-])(CC(=O)[O-])c1c(cc(cc1)C)OCc2nc3c(cc(cc3N(CC(=O)[O-])CC(=O)[O-])OC)cc2 |
| InChI | 1S/C26H27N3O10.4K/c1-15-3-6-19(28(10-22(30)31)11-23(32)33)21(7-15)39-14-17-5-4-16-8-18(38-2)9-20(26(16)27-17)29(12-24(34)35)13-25(36)37;;;;/h3-9H,10-14H2,1-2H3,(H,30,31)(H,32,33)(H,34,35)(H,36,37);;;;/q;4*+1/p-4 |
| InChI key | XAGUNWDMROKIFJ-UHFFFAOYSA-J |
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