Azo Dyes

Cat. No.

A24581

CAS No.

1934-21-0

Tartrazine

Synonyms: Acid Yellow 23; FD&C Yellow No. 5

Tartrazine (Acid Yellow 23; FD&C Yellow No. 5) is an orally active synthetic azo dye that appears as an orange-yellow, water-soluble powder producing a bright yellow coloration in solution. It is widely used as a food colorant and in pharmaceuticals and cosmetics due to its high chemical and photostability. Beyond its industrial applications, Tartrazine has been reported to induce mitochondria-mediated apoptosis and to exhibit potential biological effects, including neurodevelopmental toxicity, cytotoxicity, and genotoxicity under certain experimental conditions. It serves as a model compound in toxicological and biochemical studies investigating the safety and cellular impact of synthetic food dyes.

Cat. No.

A24751

CAS No.

2611-82-7

Ponceau 4R

Synonyms: Acid Red 18; New Coccine

Ponceau 4R is a synthetic colorant primarily utilized as a dye in food applications. This strawberry red azo dye is synthesized from aromatic hydrocarbons and exhibits stability to light, heat, and acids, making it suitable for a variety of food products. Its vibrant coloring properties allow for effective use in food laboratories and quality control assessments.

Cat. No.

A25006

CAS No.

547-58-0

Methyl Orange

Methyl Orange is an azo dye primarily utilized as an acid-base indicator. It exhibits a color change from red at pH 3.1 to bright yellow at pH 4.4, facilitating its application in various pH-related experiments. In addition to its use in acid-base titrations, Methyl Orange is employed for cellular staining and dyeing textiles. Notably, at concentrations of 500 mg/L, it has been shown to exhibit cytotoxic effects and can induce DNA damage, making it relevant for studies in cytotoxicity and genotoxicity.

Cat. No.

A43339

CAS No.

13301-33-2

C.I. Mordant green 17

C.I. Mordant Green 17 is a fluorescent dye characterized by its azo structure. It exhibits strong absorption and fluorescence properties, making it suitable for various biological staining applications. This dye is commonly used in histology and cytology for the visualization of cellular components, enabling researchers to study tissue morphology and cellular interactions effectively.

Cat. No.

A43733

CAS No.

2243-76-7

Alizarine Yellow R

Synonyms: Mordant orange 1

Alizarine Yellow R, a salicylic acid derivative and azo dye, functions primarily as a pH indicator. It exhibits key biological activity as a staining agent in various chemical examinations and is utilized in biological research. Additionally, Alizarine Yellow R finds applications in dyeing industries, making it a versatile reagent in both laboratory and industrial settings.

Cat. No.

A43886

CAS No.

165660-27-5

Hydroxy naphthol blue (disodium)

Hydroxy naphthol blue (disodium) is an azo dye utilized primarily as an acid-base indicator, exhibiting a maximum absorbance at 650 nm. This compound demonstrates distinct color changes within the pH range of 12 to 13, appearing pale red in the presence of calcium ions and transitioning to dark blue upon interaction with disodium EDTA. It is valuable in biochemical assays and analytical chemistry for monitoring pH levels and ion concentrations.

Cat. No.

A44347

CAS No.

85-84-7

Yellow AB

Synonyms: Solvent yellow 5

Yellow AB, also known as Solvent Yellow 5, is an azo dye that primarily interacts with colorimetric systems. It exhibits key biological activity as a dyeing agent and finds applications in various research settings, including studies involving color development and food science. This compound is useful for analyzing food products and assessing dye stability and migration in various matrices.

Cat. No.

A44613

CAS No.

573-58-0

Congo Red

Congo Red is an azo dye that specifically binds to amyloid proteins. Its primary application is as a histological stain for the detection of amyloid deposits in tissue sections, facilitating the diagnosis of amyloidosis and related diseases. Additionally, Congo Red is utilized in various research studies to investigate protein aggregation and misfolding, making it a valuable reagent in both clinical and experimental settings.

Cat. No.

A44626

CAS No.

2783-94-0

Sunset Yellow FCF

Synonyms: Orange Yellow S; Food Yellow 3; CI 15985

Sunset Yellow FCF is an orange azo dye that exhibits maximal absorption at a wavelength of 480 nm. This compound serves as a coloring agent in various applications, including food, cosmetics, and pharmaceuticals, and is utilized for its stability and vibrant hue. Its use in research allows for the study of dye behavior and interactions in biological systems.

Cat. No.

A44634

CAS No.

3567-69-9

Carmoisine

Synonyms: Azorubine; Acid Red 14; E122

Carmoisine, an azo dye, is primarily utilized as a colorant in various food applications. This compound exhibits strong coloring properties, making it ideal for use in the food and beverage industry. Research on Carmoisine may also extend to studies investigating its safety and regulatory aspects as a food additive.

Cat. No.

A44670

CAS No.

2766-77-0

Crystal Ponceau 6R

Crystal Ponceau 6R is a red azo dye that primarily targets proteins for staining applications. It is commonly used in histology, particularly for staining fibrin in the Martius, Scarlet, and Blue (MSB) Trichrome stain protocol. This reagent plays a crucial role in visualizing tissue structures and protein localization in various biological specimens. Its application in histological analysis enhances the clarity and contrast of fibrous tissue components.

Cat. No.

A44707

CAS No.

68555-86-2

Acid orange 156

Acid Orange 156 is a fluorescent azo dye characterized by its ability to undergo complexation with metal ions, enhancing its removal from aqueous solutions. It is utilized in various biological applications, including cell imaging and as a tracer in environmental studies. This dye's unique fluorescent properties make it a valuable tool in chemical research and analytical sciences.

Cat. No.

A44711

CAS No.

3351-05-1

Acid blue 113

Acid Blue 113 is an azo dye that serves as a fluorescent probe for various biological applications. This compound exhibits pronounced staining properties, making it useful in imaging and detection assays. Additionally, its staining effect can be effectively mitigated by nanoscale zero-valent iron (NZVI) particles, providing a mechanism for environmental remediation studies involving dye degradation. Acid Blue 113 is valuable in research focused on analyzing and visualizing biological processes.

Cat. No.

A44716

CAS No.

6359-29-1

Mordant red 15

Mordant Red 15 is an azo dye that serves as a fluorescent marker in various biological applications. It exhibits strong absorption properties, enabling visualization and tracking of biomolecules in microscopy and imaging studies. This reagent is useful in histological staining, allowing researchers to study tissues and cellular components with greater clarity and contrast.

Cat. No.

A44744

CAS No.

22244-14-0

Direct Black 38 free acid

Synonyms: Chlorazol Black E free acid; Ferristatin II; C.I. 30235 free acid

Direct Black 38 free acid is a benzidine-based azo dye that serves as a substrate for Enterococcus gallinarum. It exhibits biodegradability through microbial enzymatic reduction, resulting in the cleavage of azo bonds and the release of benzidine and 4-aminobiphenyl. This compound is primarily utilized in environmental toxicology, wastewater treatment, and carcinogenicity research, although caution is warranted due to the classification of its metabolite, benzidine, as a human carcinogen.

Cat. No.

A44758

CAS No.

6359-83-7

C.I. Mordant yellow 8

C.I. Mordant Yellow 8 is a fluorescent dye known for its azo structure. It exhibits strong absorbance properties in the visible spectrum, making it suitable for a variety of biological staining applications. This compound is widely utilized in histology and microscopy for visualizing cellular components, enhancing contrast in tissue samples, and facilitating the study of biological structures. Its efficient staining capabilities make it a valuable tool in chemical research.

Cat. No.

A44864

CAS No.

915-67-3

Amaranth

Synonyms: Acid Red 27; Azorubin S; FD & C Red Dye No. 2

Amaranth is an organic azo dye known for its ability to inhibit cellular immune responses. This compound is primarily utilized as a food additive in various applications. Its unique properties make it a valuable reagent for researchers exploring the effects of azo dyes on biological systems and immune functions.

Cat. No.

A45034

CAS No.

3737-95-9

Calconcarboxylic acid

Calconcarboxylic acid is an azo dye that functions as a silver-ion sensitizer, enhancing the staining of proteins in SDS-PAGE gels. By forming a silver-dye complex, it increases silver binding to protein bands or spots, thereby improving the sensitivity of detection. This reagent is useful for applications in protein analysis and characterization, particularly in techniques that require enhanced visualization of proteins.

Cat. No.

A45041

CAS No.

74543-21-8

Acid Yellow 9 monosodium salt

Synonyms: Hydrogen 4-aminoazobenzene-3,4'-disulphonate sodium salt

Acid Yellow 9 monosodium salt is an azo dye that serves as a carbon, nitrogen, and energy source for the bacterium Pseudomonas fluorescens. It is primarily utilized in studies focusing on biodegradation and environmental microbiology, particularly in assessing the capacity of microorganisms to metabolize synthetic dyes. This compound is relevant in research investigating bioremediation processes and the environmental impact of chemical pollutants.

Cat. No.

A45102

CAS No.

523-44-4

Orange I

Synonyms: α-Naphthol Orange

Orange I, an anionic azo dye, is known for its ability to form complexes with Methylene blue, resulting in fluorescence quenching. The equilibrium constant for this interaction is approximately 79,900 mol⁻¹·dm³, highlighting its strong binding efficacy. This compound can alter the absorption spectrum of both itself and Methylene blue, making it useful in studies of photophysical properties and dye interactions. Its applications extend to various fields, including analytical chemistry and biophysics.

Cat. No.

A45252

CAS No.

70865-20-2

Acid yellow 199

Acid Yellow 199 is an azo dye primarily utilized for its fluorescent properties. This compound undergoes decolorization via reduction reactions, making it a valuable tool in various chemical and biological research applications. It is especially useful in studies involving visualization techniques and photochemical reactions.

Cat. No.

A45309

CAS No.

5858-39-9

Acid Red 4

Acid Red 4 is an azo dye known for its vibrant coloration properties. It has a maximum absorbance at 508 nm, making it suitable for various analytical applications. This compound is commonly utilized in biochemical assays and staining procedures, particularly in the study of cellular structures and processes.

Cat. No.

A45460

CAS No.

3564-15-6

Mordant brown 1

Mordant Brown 1 is an azo dye that functions as a specific inhibitor of the CD40-CD154 costimulatory protein-protein interaction. This compound plays a significant role in immunological research by modulating immune responses. Its application extends to studies aimed at understanding autoimmune diseases and enhancing the efficacy of immunotherapeutic strategies.

Cat. No.

A45464

CAS No.

634-21-9

Ethyl red iodide

Synonyms: 1,1'-Diethyl-2,4'-cyanine iodide

Ethyl red iodide functions as an azo dye and acid-base indicator. This compound exhibits pH-sensitive color changes, making it a valuable tool in various analytical chemistry applications. Researchers utilize ethyl red iodide for titrations and pH measurement studies, aiding in the assessment of acidity and alkalinity in diverse samples. Its stability and reliability in colorimetric assays make it essential for laboratory investigations.

Cat. No.

A45480

CAS No.

24610-00-2

2-4-(2-Cyanoethyl)(2-phenylethyl)aminophenylazo-5-nitrobenzonitrile

2-4-(2-Cyanoethyl)(2-phenylethyl)aminophenylazo-5-nitrobenzonitrile is an azo dye characterized by its stable, nonagglomerating fluid dispersions. This compound exhibits strong color properties and is used in various applications involving dyeing and coloration in chemical research. Its unique structural features and stability make it suitable for investigations in materials science and analytical chemistry.