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Cal-520, AM is a fluorogenic calcium-sensitive dye for detecting intracellular calcium mobilization with significantly improved signal-to-noise ratio and intracellular retention compared to existing calcium indicators.


- Molecular Weight – 1102.95 Da
- Provides >100 times fluorescence enhancement upon binding calcium
- Ideal for high-sensitivity calcium mobilization detection
- Suitable for evaluating calcium channels and receptor targets
- Excellent for screening agonists and antagonists in live cell assays

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Immunocytochemistry - Cal-520, AM (AB171868), expandable thumbnail

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Key facts

Form
Solid

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Cal-520, AM is a fluorogenic calcium-sensitive dye for detecting intracellular calcium mobilization with significantly improved signal-to-noise ratio and intracellular retention compared to existing calcium indicators.


- Molecular Weight – 1102.95 Da
- Provides >100 times fluorescence enhancement upon binding calcium
- Ideal for high-sensitivity calcium mobilization detection
- Suitable for evaluating calcium channels and receptor targets
- Excellent for screening agonists and antagonists in live cell assays

Key facts

Form
Solid
Storage buffer

Constituents: 100% Cal-520®, AM

Storage

Shipped at conditions
Blue Ice
Appropriate short-term storage conditions
-20°C
Appropriate long-term storage conditions
-20°C
Storage information
Store in the dark

Notes

ab171868 provides a robust homogeneous fluorescence-based assay tool for detecting intracellular calcium mobilization. Cal-520 AM is a new fluorogenic calcium-sensitive dye with a significantly improved signal to noise ratio and intracellular retention compared to the existing green calcium indicators (such as Fluo-3 AM and Fluo-4 AM). Cells expressing a GPCR or calcium channel of interest that signals through calcium can be preloaded with Cal-520 AM which can cross cell membrane. Once inside the cell, the lipophilic blocking groups of Cal 520 AM are cleaved by esterases, resulting in a negatively charged fluorescent dye that stays inside cells. Its fluorescence is greatly enhanced upon binding to calcium. When cells stimulated with agonists, the receptor signals the release of intracellular calcium, which significantly increase the fluorescence of Cal-520. The characteristics of its long wavelength, high sensitivity, and >100 times fluorescence enhancement, make Cal-520 AM an ideal indicator for the measurement of cellular calcium. The high S/N ratio and better intracellular retention make the Cal-520 calcium assay a robust tool for evaluating GPCR and calcium channel targets as well as for screening their agonists and antagonists.

Molecular Weight (MW) 1102.95 Da.

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1 product image

  • Immunocytochemistry - Cal-520, AM (ab171868), expandable thumbnail

    Immunocytochemistry - Cal-520, AM (ab171868)

    CHO-M1 cells were seeded overnight at 40,000 cells per 100 μL per well in a 96-well black wall/clear bottom plate. 100 μl of 4 μM Cal 520 AM in HHBS were added into the wells, and the cells were incubated at 37 °C for 2 hour.

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