234109

Methyl Orange

certified by the Biological Stain Commission

• Synonym(s): 4-[4-(Dimethylamino)phenylazo]benzenesulfonic acid sodium salt, Acid Orange 52, Helianthin, Orange III
• Empirical Formula (Hill Notation): C₁₄H₁₄N₃NaO₃S
• CAS Number: 547-58-0
• Molecular Weight: 327.33
• Colour Index Number: 13025
• Beilstein: 4732884
• EC Number: 208-925-3
• MDL number: MFCD00007502
• UNSPSC Code: 12171500
• PubChem Substance ID: 24854020

Properties

• grade: certified by the Biological Stain Commission
• composition: Dye content, ≥85%
• pH: 3.0-4.4, pink to yellow
• λmax: 507 nm
• SMILES string: [Na+].CN(C)c1ccc(cc1)\N=N\c2ccc(cc2)S([O-])(=O)=O
• InChI: 1S/C14H15N3O3S.Na/c1-17(2)13-7-3-11(4-8-13)15-16-12-5-9-14(10-6-12)21(18,19)20;/h3-10H,1-2H3,(H,18,19,20);/q;+1/p-1/b16-15+;
• InChI key: STZCRXQWRGQSJD-GEEYTBSJSA-M

Description

Suitability

Certified for use in the Wilson-Ezrin method for pituitary acidophils; Kreyberg′s method for keratin and mucus; as a counterstain following Heidenhain′s or Weigert′s hematoxylin on paraffin sections; as a substitute for orange G in Flemming′s triple stain.

Safety Information

• Pictograms: GHS06
• Signal Word: Danger
• Hazard Statements: H301
• Precautionary Statements: P301 + P330 + P331 + P310
• Hazard Classifications: Acute Tox. 3 Oral
• Storage Class Code: 6.1D - Non-combustible acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects
• WGK: WGK 3
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable
• Personal Protective Equipment: dust mask type N95 (US), Eyeshields, Gloves