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Molecular Probes™ Fluo-3, AM, Calcium Indicator Non-distribution product as customer accommodation.

Fluo-3, AM, Calcium Indicator

Manufacturer:  Molecular Probes™ F1242

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Catalog No. F1242



Labeled calcium indicators are molecules that exhibit an increase in fluorescence upon binding Ca2+. Fluo-3 has been used to image the spatial dynamics of Ca2+ signaling, in flow cytometry experiments involving photoactivation of caged chelators, second messengers, and neurotransmitters, and for cell-based pharmacological screening. Fluo-4 is an analog of fluo-3 with the two chlorine substituents replaced by fluorines, which results in increased fluorescence excitation at 488 nm and consequently higher fluorescence signal levels. Cells may be loaded with the AM ester forms of these calcium indicators by adding the dissolved indicator directly to dishes containing cultured cells. These indicators are useful for fluorescence and confocal microscopy, flow cytometry, and microplate screening applications.

Calcium Indicator (AM Ester) Specifications:
  • Label (Ex/Em of Ca2+–bound form): Fluo-3 (506/526 nm)
  • Fluorescence intensity increase upon binding Ca2+: >100 fold
  • Kd for Ca2+ in buffer: ~335 nM
  • Exhibit fluorescence increase upon binding Ca2+ with little shift in wavelength

    Using TPEN to Control Heavy Metal Cations
    In addition, BAPTA-based indicators such as these bind various heavy metal cations (e.g., Mn2+, Zn2+, Pb2+) with substantially higher affinity than Ca2+. Perturbations to calcium measurements caused by presence of these ions can be controlled using the heavy metal-selective chelator TPEN.

    More Choices for Fluorescent Calcium Indicators
    We offer a large selection of Molecular Probes™ calcium indicators for use in various experimental scenarios. For more information, review Fluorescent Ca2+ Indicators Excited with Visible Light—Section 19.3 in the Molecular Probes™ Handbook.

    For UV-excitable Ca2+ indicators, protein-based Ca2+ indicators, conjugates of Ca2+ indicators, and for fluorescence-based indicators of other metal ions (i.e., Mg2+, Zn2+) review Indicators for Ca2+, Mg2+, Zn2+ and Other Metal Ions—Chapter 19 in the Molecular Probes™ Handbook.

    For Research Use Only. Not for human or animal therapeutic or diagnostic use.
  • Specifications


    20 x 50μg
    –5 to –30°C
    For confocal microscope, fluorescence microscope, fluorescent imager, hts reader, high content instrument, microplate reader
    Fluo-3 AM Calcium Indicator
    Fluo-3 AM, 20 x 50μg, Red, Solid, 1129.86 Molecular Weight, C51H50Cl2N2O23 Molecular Formula, Calcium Indicator, Fluorescent Detection Method, –5 to –30°C Storage, ≥93% at 254nm HPLC Purity, Use with Confocal Microscope, Fluorescence Microscope
    For cell viability, proliferation and function, cellular imaging, pharma and biopharma, target and lead identification and validation
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    For Research Use Only. Not for use in diagnostic procedures.