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Cal-520®-Dextran Conjugate *MW 3,000*

Fluorescence intensity increase of Cal-520®-Dextran (Cat# 20600), Cal-520®-Dextran (Cat# 20601) and Calcium-Green™-1-Dextran upon binding saturated amount of calcium.
Fluorescence intensity increase of Cal-520®-Dextran (Cat# 20600), Cal-520®-Dextran (Cat# 20601) and Calcium-Green™-1-Dextran upon binding saturated amount of calcium.
Ordering information
Price ()
Catalog Number20600
Unit Size
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Additional ordering information
InternationalSee distributors
ShippingStandard overnight for United States, inquire for international
Physical properties
Molecular weight4000
Spectral properties
Excitation (nm)493
Emission (nm)515
Quantum yield0.751
Storage, safety and handling
H-phraseH303, H313, H333
Hazard symbolXN
Intended useResearch Use Only (RUO)
R-phraseR20, R21, R22
StorageFreeze (< -15 °C); Minimize light exposure


Molecular weight
Excitation (nm)
Emission (nm)
Quantum yield
Calcium measurement is critical for numerous biological investigations. Fluorescent probes that show spectral responses upon binding calcium have enabled researchers to investigate changes in intracellular free calcium concentrations by using fluorescence microscopy, flow cytometry, fluorescence spectroscopy and fluorescence microplate readers. Cells may be physically loaded with the cell-impermeant salt forms of these dextran-conjugated calcium indicators using patch pipette or microinjection. The fluorescence signal from these cells is measured using fluorescence microscopy. The dextran forms of our calcium indicators show a dramatic reduction in both leakage and compartmentalization compared to the AM ester forms. Among the fluorescent calcium indicator dextran conjugates, Cal-520 dextran conjugates might be the best choice due to their high fluorescence quantum yield and large fluorescence enhancement by calcium. Compared to Oregon Green BAPTA-1 dextran, Cal-520 dextran exhibits much lower background and much larger calcium-induced fluorescence enhancement.


Common stock solution preparation

Table 1. Volume of Water needed to reconstitute specific mass of Cal-520®-Dextran Conjugate *MW 3,000* to given concentration. Note that volume is only for preparing stock solution. Refer to sample experimental protocol for appropriate experimental/physiological buffers.

0.1 mg0.5 mg1 mg5 mg10 mg
1 mM25 µL125 µL250 µL1.25 mL2.5 mL
5 mM5 µL25 µL50 µL250 µL500 µL
10 mM2.5 µL12.5 µL25 µL125 µL250 µL

Molarity calculator

Enter any two values (mass, volume, concentration) to calculate the third.

Mass (Calculate)Molecular weightVolume (Calculate)Concentration (Calculate)Moles


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Spectral properties

Excitation (nm)493
Emission (nm)515
Quantum yield0.751


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Journal: American Journal of Physiology-Regulatory, Integrative and Comparative Physiology (2020): R545--R564
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Authors: Fratti, Rutilio A and Miner, Gregory E and Sullivan, Katherine D and Guo, Annie and Starr, Matthew L and Ellis, Ez and Jones, Br and on, undefined
Journal: bioRxiv (2019): 533067
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Journal: (2018)
Advances in Two-Photon Scanning and Scanless Microscopy Technologies for Functional Neural Circuit Imaging
Authors: Schultz, Simon R and Copel, undefined and , Caroline S and Foust, Am and a J , undefined and Quicke, Peter and Schuck, Renaud
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Journal: Pflügers Archiv-European Journal of Physiology (2017): 1--17
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Authors: Uehara, Akira and Murayama, Takashi and Yasukochi, Midori and Fill, Michael and Horie, Minoru and Okamoto, Toru and Matsuura, Yoshiharu and Uehara, Kiyoko and Fujimoto, Takahiro and Sakurai, Takashi and others, undefined
Journal: The Journal of general physiology (2017): 199--218
Synchronicity and Rhythmicity of Purkinje Cell Firing during Generalized Spike-and-Wave Discharges in a Natural Mouse Model of Absence Epilepsy Complex Spike Synchronicity during GSWDs
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Journal: Frontiers in Cellular Neuroscience (2017): 346
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Authors: Hamasaki, Yuuta and Haba, Natsumi and Iwata, Naoki and Uno, Yoshiki and Saito, Minoru
Journal: Journal of Behavioral and Brain Science (2017): 68
Ca 2+ signals initiate at immobile IP 3 receptors adjacent to ER-plasma membrane junctions
Authors: Thillaiappan, Nagendra Babu and Chavda, Alap P and Tovey, Stephen C and Prole, David L and Taylor, Colin W
Journal: Nature Communications (2017): 1505