Calbryte™-520L, potassium salt

The intracellular calcium flux assay is a widely used method for monitoring signal transduction pathways and high throughput screening of G protein-coupled receptors (GPCRs) and calcium channel targets. Following the introduction of Fluo-3 in 1989, Fluo-4, Fluo-8, and Cal-520 were later developed with enhanced signal-to-background ratios and soon became the Ca2+ indicators of choice for confocal microscopy, flow cytometry, and high throughput screening applications. Calbryte 520L has a low affinity to calcium ions with a Kd ≤91 µM. Calbryte 520L produces a bright fluorescence signal in the presence of calcium at a high concentration. It has an identical excitation and emission wavelength as Fluo-4; thus, the same Fluo-4 assay settings can be readily applied to Calbryte 520L-based calcium assays.

Ca2+ Dependent Dose Response of Calbryte 520

Protocol

SDS

COA

Catalog	Size	Price	Quantity
20642	10X50 ug	Price

Calculators

Common stock solution preparation

Table 1. Volume of Water needed to reconstitute specific mass of Calbryte™-520L, potassium 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 mg	0.5 mg	1 mg	5 mg	10 mg
1 mM	125.805 µL	629.026 µL	1.258 mL	6.29 mL	12.581 mL
5 mM	25.161 µL	125.805 µL	251.61 µL	1.258 mL	2.516 mL
10 mM	12.581 µL	62.903 µL	125.805 µL	629.026 µL	1.258 mL

Molarity calculator

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

Mass (Calculate)		Molecular weight		Volume (Calculate)		Concentration (Calculate)		Moles
mg	÷	794.88 g/mol	=	mL	x	mM	=	mmol

Citations

View all 11 citations: Citation Explorer

Integrin-mediated electric axon guidance underlying optic nerve formation in the embryonic chick retina

Authors:

Yamashita, Masayuki

Journal:

Communications Biology (2023): 680

Calreticulin regulates TGF-β1-induced epithelial mesenchymal transition through modulating Smad signaling and calcium signaling

Authors:

Wu, Yanjiao and Xu, Xiaoli and Ma, Lunkun and Yi, Qian and Sun, Weichao and Tang, Liling

Journal:

The International Journal of Biochemistry & Cell Biology (2017)

Monosialoganglioside 1 may alleviate neurotoxicity induced by propofol combined with remifentanil in neural stem cells

Authors:

Lu, Jiang and Yao, Xue-qin and Luo, Xin and Wang, Yu and Chung, Sookja Kim and Tang, He-xin and Cheung, Chi Wai and Wang, Xian-yu and Meng, Chen and Li, Qing and others, undefined

Journal:

Neural Regeneration Research (2017): 945

Obtaining spontaneously beating cardiomyocyte-like cells from adipose-derived stromal vascular fractions cultured on enzyme-crosslinked gelatin hydrogels

Authors:

Yang, Gang and Xiao, Zhenghua and Ren, Xiaomei and Long, Haiyan and Ma, Kunlong and Qian, Hong and Guo, Yingqiang

Journal:

Scientific Reports (2017): 41781

Dexmedetomidine reduces hypoxia/reoxygenation injury by regulating mitochondrial fission in rat hippocampal neurons

Authors:

Liu, Jia and Du, Qing and Zhu, He and Li, Yu and Liu, Maodong and Yu, Shoushui and Wang, Shilei

Journal:

Int J Clin Exp Med (2017): 6861--6868

References

View all 53 references: Citation Explorer

A flow cytometric comparison of Indo-1 to fluo-3 and Fura Red excited with low power lasers for detecting Ca(2+) flux

Authors:

Bailey S, Macardle PJ.

Journal:

J Immunol Methods (2006): 220

Functional fluo-3/AM assay on P-glycoprotein transport activity in L1210/VCR cells by confocal microscopy

Authors:

Orlicky J, Sulova Z, Dovinova I, Fiala R, Zahradnikova A, Jr., Breier A.

Journal:

Gen Physiol Biophys (2004): 357

Comparison of human recombinant adenosine A2B receptor function assessed by Fluo-3-AM fluorometry and microphysiometry

Authors:

Patel H, Porter RH, Palmer AM, Croucher MJ.

Journal:

Br J Pharmacol (2003): 671

Measurement of the dissociation constant of Fluo-3 for Ca2+ in isolated rabbit cardiomyocytes using Ca2+ wave characteristics

Authors:

Loughrey CM, MacEachern KE, Cooper J, Smith GL.

Journal:

Cell Calcium (2003): 1

A sensitive method for the detection of foot and mouth disease virus by in situ hybridisation using biotin-labelled oligodeoxynucleotides and tyramide signal amplification

Authors:

Zhang Z, Kitching P.

Journal:

J Virol Methods (2000): 187

Physical properties

Dissociation constant (K_d, nM)	91000
Molecular weight	794.88
Solvent	Water

Spectral properties

Excitation (nm)	493
Emission (nm)	515
Quantum yield	0.75 ¹

Storage, safety and handling

H-phrase	H303, H313, H333
Hazard symbol	XN
Intended use	Research Use Only (RUO)
R-phrase	R20, R21, R22
Storage	Freeze (< -15 °C); Minimize light exposure
UNSPSC	12352200

Telephone
Fax
Email	sales@aatbio.com
International	See distributors
Bulk request	Inquire
Custom size	Inquire
Technical Support	Contact us
Request quotation	Request
Purchase order	Send to sales@aatbio.com
Shipping	Standard overnight for United States, inquire for international

Page updated on October 13, 2025