Quinaldine Red

Dye content 95 %

2-(4-Dimethylaminostyryl)-1-ethylquinolinium iodide
Empirical Formula (Hill Notation):
CAS Number:
Molecular Weight:
Beilstein/REAXYS Number:
EC Number:
MDL number:
PubChem Substance ID:

Quality Level


powder or crystals


Dye content, 95%


hematology: suitable
histology: suitable
titration: suitable


ethanol: 1 mg/mL, clear, dark red


528 nm

Featured Industry

Diagnostic Assay Manufacturing

storage temp.

room temp

SMILES string




InChI key


Looking for similar products? Visit Product Comparison Guide

Related Categories


Quinaldine Red has been used as a fluorescent probe for α1-acid glycoprotein (AAG).


5, 25 g in glass bottle

Biochem/physiol Actions

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.


NONH for all modes of transport

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis
Certificate of Origin
A I Ivanov et al.
Clinical and experimental medicine, 2(3), 147-155 (2002-11-26)
The acute-phase response alters the composition of carrier proteins in plasma, which may affect the blood deposition and transport of biomediators and drugs. The effect of the acute-phase response on the ligand binding ability of plasma was studied in leukemic...
H Imamura et al.
Pharmaceutical research, 11(4), 566-570 (1994-04-01)
We examined different fluorescent probes suitable for fluorometric determination of alpha 1-acid glycoprotein (AGP) in serum. Quinaldine red (QR) was shown to bind strongly and selectively to AGP. Taking advantage of the enhanced fluorescence of QR in the presence of...
Paul Zuck et al.
Analytical biochemistry, 342(2), 254-259 (2005-06-14)
Miniaturization of high-throughput screening (HTS) assays has several obvious advantages, including increased throughput and lower cost by reduction in reagent consumption. Although absorbance assays are widely used in research laboratories, their application for HTS in a low-volume format has been...
World Health Organization
The International Pharmacopoeia, 1 (2006)
H Imamura et al.
Biological & pharmaceutical bulletin, 16(9), 926-929 (1993-09-01)
We attempted to develop a fluorescent probe superior to conventional ones (8-anilino-1-naphthalenesulfonate and auramine O) for use in the study of drug-binding sites on alpha 1-acid glycoprotein (AGP). It was found that quinaldine red (QR) strongly bound to AGP and...

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service

Social Media

LinkedIn icon
Twitter icon
Facebook Icon
Instagram Icon


Research. Development. Production.

We are a leading supplier to the global Life Science industry with solutions and services for research, biotechnology development and production, and pharmaceutical drug therapy development and production.

© 2021 Merck KGaA, Darmstadt, Germany and/or its affiliates. All Rights Reserved.

Reproduction of any materials from the site is strictly forbidden without permission.