Orange G
Name: Orange G
CAS Registry Number: 1936-15-8
CA Index Name: 1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-(2-phenyldiazenyl)-, sodium salt (1:2)
Other Names: 1,3-Naphthalenedisulfonic acid, 7-hy-droxy-8-(phenylazo)-, disodium salt; 2-Naphthol-6,8-dis-ulfonic acid, 1-phenylazo-, disodium salt; C.I. Acid Orange 10; C.I. Acid Orange 10, disodium salt; 1370 Orange; Acid Crystal Orange; Acid Fast Orange EGG; Acid Fast Orange G; Acid Fast Orange GG; Acid Leather Orange G; Acid Leather Orange KG; Acid Leather Orange PGW; Acid Lightfast Orange; Acid Orange 10; Acid Orange 2G; Acid Orange 2GL; Acid Orange EGG; Acid Orange G; Acid Orange G Crystal; Acid Orange GG; Acid Orange Lightfast; Acidal Fast Orange; Acilan Orange GX; Ama-cid Crystal Orange; Amacid Light Orange G; Anadurm Orange A-G; Apocid Orange 2G; Atul Acid Crystal Orange G; Brasilan Orange 2G; Bucacid Fast Orange G; C.I. 16230; C.I. Food Orange 4; Calcocid Fast Light Orange 2G; Certicol Orange GS; Cetil Light Orange GG; Colacid Orange G; Colocid Orange 2G; Colorosacid Orange 10; Concorde Acid Orange L-GX; Crystal Orange 2G; Crystal Orange G; D and C Orange No. 3; Dinacid Crystal Orange G; Dolkwal Orange G; Duasyn Acid Orange GG; Dyacid Orange G; Dynacid Orange 2G; Egacid Orange GG; Eniacid Light Orange G; Erio Fast Orange AS; Fabracid Orange FL; Fast Acid Orange G; Fast Light Orange G; Fast Light Orange GA-CF; Fenazo Light Orange 2G; Food Orange 4; Food Orange GG; Hexacol Orange G; Hexacol Orange GG Crystals; Hidacid Fast Orange G; Hispacid Fast Orange 2G; Indacid Crystal Orange; Kemacid Crystal Orange G; Keyacid Orange 2G; Kiton Fast Orange G; Light Orange G; Multacid Orange 2G; Naphthalene Fast Orange 2G; Naphthalene Fast Orange 2GS; Naphthazine Orange 2G; Neelicol Orange G; Neklacid Fast Orange GG; Orange 2G; Orange BPC; Orange G; Orange G dye; Orange GBPC; Orange GG; Pacid Orange G 10; Sandolan Fast Orange E-GL; Sando-lan Orange E-GL; Solar Light Orange GX; Straight Orange G; Tetracid Light Orange G; Triacid Light Orange 2G; Vicoacid Orange IJ; Victacid Orange IJ; Vondacid Light Orange 2G; Water Orange 145924; Wool Orange 2G; Wool Orange G; Xylene Fast Orange G
Merck Index Number: Not listed
Chemical / Dye Class: Azo
Molecular Formula: C16H10N2Na2O7S2
Molecular Weight: 452.37
Physical Form: Orange to red powder
Solubility: Soluble in water, methyl cellosolve; slightly soluble in ethanol; insoluble in xylene
Melting Point: 141 °C
pH Range: 11.5-14.0
Color Change at pH: Yellow (11.5) to pink (14.0)
pKa: 12.8
Absorption (λmax): 475 nm
Synthesis: Synthetic method
Staining Applications: Adenohypophyseal cells; clavanins; cells; eosinophil leukocyte granules; fungi; food; drinks; candies; lymph nodes; pap smears; proteins; keratin fibers; hairs; skin; sputum; glial tumors; zein membranes; urinary sediments
Biological Applications: Detecting lung cancer metastasis; measuring glycated proteins; ophthalmic devices
Industrial Applications: Inks; highlighters; photography; plastics; paper; textiles; wood
Safety / Toxicity: Acute oral toxicity; bacterial toxicity; carcinogenicity; chromosomal aberration; freshwater shrimp toxicity; genotoxicity; hematotoxicity; mutagenicity; serological toxicity; short-term toxicity
Certification / Approval: Certified by Biological Stain Commission (BSC)
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