Quinaldine red 95% (dye content), Sigma-Aldrich®

Supplier: SIGMA-ALDRICH MICROSCOPY

Synonyms: 2-(2-(4-Dimethylamino)styryl)-1-ethylquinolinium iodide, 2-(4-(Dimethylamino)styryl)-1-ethylquinolin-1-ium iodide

M-Clarity™ quality level = MQ200

201316-25G 201316-5G
201316-25GEA 411 EUR
201316-25G 201316-5G
Quinaldine red 95% (dye content), Sigma-Aldrich®
Quinaldine red

Quinaldine red has been used as a fluorescent probe for α1-acid glycoprotein (AAG). It is also used a diagnostic assay manufacturing, hematology, histology.


Quinaldine red (2-(p-Dimethylaminostyryl) quinoline ethiodide) is a very dark red or reddish-black colored powder. It has been used mainly for regulation of cell proliferation, in diagnostic agents of disease related with amyloid accumulation, detecting enzyme activity and dental bleaching materials. In addition, quinaldine red also been implicated in treatment of allodynia and virus infectious diseases. It is colorless at pH 1,4 and red at pH 3,2.

Formula: C₂₁H₂₃IN₂
MW: 430,33 g/mol
Melting Pt: 240 °C
Storage Temperature: RT
MDL Number: MFCD00011968
CAS Number: 117-92-0
EINECS: 204-221-5
Merck Index: 12,08230
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Specification Test Results

Appearance (Colour) Green to Black
Appearance (Form) Powder to Crystalline Powder
Infrared spectrum Conforms to Structure
Wavelength 279 - 285 nm
Extinction Coefficient ≥8800
Carbon 55.4 - 61.8%
Nitrogen 6.1 - 6.9%
Solubility (Turbidity) Clear
Solubility (Colour) Conforms to requirements dark red to purple

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