Oil Red O

Name: Oil Red O

CAS Registry Number: 1320-06-5

CA Index Name: 2-Naphthalenol, 1-[2-[4-[2-(dimethylphenyl)diazenyl]dimethylphenyl]diazenyl]-

Other Names: 2-Naphthalenol, 1-[[4-[(dimethylphenyl) azo]dimethylphenyl]azo]-; C.I. Solvent Red 27; Oil Red O; Aizen SOT Red 2; C.I. 26125; D and C Red No. 18; Fat Red 5B; Fat Red 5B02; Oil Red 5303; Oil Red 5B; Oil Red 6B; Oil Red OS; Orient Oil Red 5B; Red OS; SOT Red 2; Solvent Red 27; 1-([4-(Xylylazo)xylyl]azo)-2-naphthol

Merck Index Number: Not listed

Chemical / Dye Class: Azo

Molecular Formula: C₂₆H₂₄N₄O

Molecular Weight: 408.49

Physical Form: Red to dark greenish-brown powder

Solubility: Slightly soluble in water, ethanol; soluble in acetone, benzene, ethyl acetate, toluene, xylene, ethylene glycol

Melting Point: 120 °C (decompose)

Absorption (λ_max): 518 nm, 359 nm

Synthesis: Synthetic method

Staining Applications: Aortic valves; cornea verticillata; human adipose-derived stem cells; intramyocellular lipid; lipids; lipid droplets; mitochondria; liposomes; lipoproteins; apolipoproteins; neutral lipids; nematodes; natural fibers; plant cuticle; pancreatic fibroblastoid/stellate cells; plant; sirolimus; spinal fluid; wheat flour; fats/oils; hairs

Biological Applications: Detecting early stages of atherosclerotic lesion formation; treating obesity, hyperlipidemia, fatty liver, leptin production disorders; dental impression material; measuring phagocytosis

Industrial Applications: Color filters; liquid crystals; photoresists; liquid crystal displays; inks; toners; adhesive paper; electrophotography; optical devices; air freshners; furniture polish; pesticide; plastic lenses; steel materials; textiles; petroleum products; perfumes; wood products

Safety / Toxicity: Cytotoxicity; deformation of lipid droplets; cardiovascular toxicity; nephrotoxicity

Certification / Approval: Certified by Biological Stain Commission (BSC)

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