Calcein

Name: Calcein

CAS Registry Number: 1461-15-0

CA Index Name: Glycine, N,N' -[(3,6 -dihydroxy-3-ox-ospiro[isobenzofuran-1(3H),9'-[9H]xanthene]-2',7'-diyl) bis(methylene)]bis[N-(carboxymethyl)-

Other Names: Bis [N, N- bis (carboxymethyl) aminome-thyl] fluorescein; Fluorescein, 2 ,7 -bis[[bis(carboxymethyl) amino]methyl]-; Fluorescein-bis(methyliminodiacetic acid); Spiro[isobenzofuran-1(3H),9'-[9H]xanthene], glycine derivative; 2,7-Bis[N,N-bis(carboxymethyl)aminomethy-lene]fluorescein; Acetic acid, [(3,6 -dihydroxy-2 ,7 -fluor-andiyl)bis(methylenenitrilo)]tetra-; Calcein; Fluorescein complexon; Fluorexon; NSC 298193; Oftasceine

Merck Index Number: Not listed

Chemical / Dye Class: Xanthene

Molecular Formula: C₃₀H₂₆N₂O₁₃

Molecular Weight: 622.53

Physical Form: Yellow-orange to brown powder

Solubility: Soluble in water, ethanol, N,N-dimethyl formamide, dimethyl sulfoxide

Melting Point: 200 °C

Boiling Point: 952.7 ± 65.0 °C, pressure: 760 Torr

pH Range: 6.0-7.2

Color Change at pH: Weak green fluorescence (6.0) to strong green fluorescence (7.2)

pK_a: 6.67

Absorption (λ_max): 494 nm

Emission (λ_max): 517 nm

Synthesis: Synthetic methods

Staining Applications: Calcium ions; fluoride ions; iron ions; mercury ions; peptides; proteins; antibodies; atherosclerotic plaque; bone; cells; fish; liposomes; neurons; skin; tumor cells; inflammations; lymphokines; hepatocytes

Biological Applications: Calcium indicator; fluoride indicator; iron indicator; mercury indicator; detecting nucleic acids, proteins; treating osteoporosis; drug delivery systems

Industrial Applications: Chemical mechanical polishing; coatings; photoresists

Safety / Toxicity: Acute toxicity; cytotoxicity; mutagenicity; neurotoxicity; ophthalmotoxicity

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