AAT Bioquest

Cal Green™ 1, hexapotassium salt

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Physical properties
Dissociation constant (Kd, nM)190
Molecular weight1147.18
Spectral properties
Excitation (nm)498
Emission (nm)517
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
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Show More (80)


Molecular weight
Dissociation constant (Kd, nM)
Excitation (nm)
Emission (nm)
Quantum yield
Cal Green™ 1 (AAT Bioquest) is the same molecule to Calcium Green-1 (Invitrogen). It exhibits an increase in fluorescence intensity upon binding calcium ion. The cell-impermeant dye, Cal Green 1 (Calcium Green-1) is a 488 nm-excitable calcium indicator. Compared to Fluo-3, Cal Green-1 is more fluorescent at low calcium concentrations, facilitating the determination of baseline calcium levels and increasing the visibility of resting cells.


Common stock solution preparation

Table 1. Volume of Water needed to reconstitute specific mass of Cal Green™ 1, hexapotassium salt 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 mM87.17 µL435.851 µL871.703 µL4.359 mL8.717 mL
5 mM17.434 µL87.17 µL174.341 µL871.703 µL1.743 mL
10 mM8.717 µL43.585 µL87.17 µL435.851 µL871.703 µL

Molarity calculator

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Spectral properties

Excitation (nm)498
Emission (nm)517
Quantum yield0.751



View all 11 references: Citation Explorer
Microscopic imaging of intracellular calcium in live cells using lifetime-based ratiometric measurements of Oregon Green BAPTA-1
Authors: Lattarulo C, Thyssen D, Kuchibholta KV, Hyman BT, Bacskaiq BJ.
Journal: Methods Mol Biol (2011): 377
An ensemble and single-molecule fluorescence spectroscopy investigation of Calcium Green 1, a calcium-ion sensor
Authors: Lu Y, Paige MF.
Journal: J Fluoresc (2007): 739
Calcium Green FlAsH as a genetically targeted small-molecule calcium indicator
Authors: Tour O, Adams SR, Kerr RA, Meijer RM, Sejnowski TJ, Tsien RW, Tsien RY.
Journal: Nat Chem Biol (2007): 423
Measurement of intracellular calcium levels by the fluorescent Ca2+ indicator Calcium-Green
Authors: Silei V, Fabrizi C, Venturini G, Tagliavini F, Salmona M, Bugiani O, Lauro GM.
Journal: Brain Res Brain Res Protoc (2000): 132
Optical imaging of neuronal activity in tissue labeled by retrograde transport of Calcium Green Dextran
Authors: McPherson DR, McClellan AD, O'Donovan MJ.
Journal: Brain Res Brain Res Protoc (1997): 157
Monitoring of Ca2+ release from intracellular stores in permeabilized rat parotid acinar cells using the fluorescent indicators Mag-fura-2 and calcium green C18
Authors: Tojyo Y, Tanimura A, Matsumoto Y.
Journal: Biochem Biophys Res Commun (1997): 189
Modulation of an Intracellular Calmodulin-Stimulated Ca2+-Pumping ATPase in Cauliflower by Trypsin (The Use of Calcium Green-5N to Measure Ca2+ Transport in Membrane Vesicles)
Authors: Askerlund P., undefined
Journal: Plant Physiol (1996): 913
Characterization of calcium translocation across the plasma membrane of primary osteoblasts using a lipophilic calcium-sensitive fluorescent dye, calcium green C18
Authors: Lloyd QP, Kuhn MA, Gay CV.
Journal: J Biol Chem (1995): 22445
A method for recording intracellular [Ca2+] transients in cardiac myocytes using calcium green-2
Authors: Spencer CI, Berlin JR.
Journal: Pflugers Arch (1995): 579
Calcium green-5N, a novel fluorescent probe for monitoring high intracellular free Ca2+ concentrations associated with glutamate excitotoxicity in cultured rat brain neurons
Authors: Rajdev S, Reynolds IJ.
Journal: Neurosci Lett (1993): 149