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Calcium ionophore III

Selectophore, function tested

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Calcium Ionophore A23187, Antibiotic A 23187, Calimycin
Empirical Formula (Hill Notation):
CAS Number:
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EC Number:
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for ion-selective electrodes

Quality Level

product line





function tested

antibiotic activity spectrum

Gram-positive bacteria

Mode of action

cell membrane | interferes

storage temp.


SMILES string




InChI key


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General description

Calcium ionophore III (Calimycin;CA) is a divalent cation ionophore. It has ability to transport Ca2+ ions across membranes along a concentration gradient.
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CA was used in elucidating the mechanisms underlying the positive and inotropic and chronotropic ability of CA on isolated superfused guinea pig atria. It may also be used to stimulate and measure the erythrocyte Ca2+ dependent K+ channels as the K+ efflux.
Calcium ionophore III may be used in ionophore-based calcium selective conductometric microsensors for the detection of calcium ions in aqueous solutions. In NIH3T3 and rat1-fibroblast cell cultures, calcium ionophore III along with thapsigargin has been reported to increase the hepatic clock gene Per1 expression in the initial period of treatment.
Ionophore highly selective for Ca2+. Potentiates responses to NMDA but not quisqualate. In cell culture, stimulates nitric oxide production by calmodulin-dependent constitutive nitric oxide synthase.


Bottomless glass bottle. Contents are inside inserted fused cone.

Other Notes

Preparation of an optical chemical sensor for Ca2+ and Mg2+

Legal Information

Selectophore is a trademark of Merck KGaA, Darmstadt, Germany

Storage Class Code

11 - Combustible Solids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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P Lijnen et al.
British journal of industrial medicine, 48(6), 392-398 (1991-06-01)
The effects of cadmium (Cd2+) on Na+,K(+)-ATPase in disrupted human erythrocyte membranes and on various transmembrane Na+ and K+ transport systems in intact erythrocyte suspensions were studied. Cadmium2+ inhibited the erythrocyte Na+,K(+)-ATPase enzyme with a 50% inhibition at a Cd2+
Multiple signaling pathways elicit circadian gene expression in cultured Rat-1 fibroblasts
Balsalobre A, et al.
Current Biology, 10(20), 1291-1294 (2000)
K. Suzuki et al.
Analytical Chemistry, 61, 382-382 (1989)
Chronic inhibition of endoplasmic reticulum calcium-release channels and calcium-ATPase lengthens the period of hepatic clock gene Per1
Baez-Ruiz A and Diaz-Mu?oz M
Journal of circadian rhythms, 9(1), 6-6 (2011)
A new calcium-sensor based on ion-selective conductometric microsensors-membranes and features
Trebbe U, et al.
Fresenius Journal of Analytical Chemistry, 371(6), 734-739 (2001)

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