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O4505

Sigma-Aldrich

Orange II sodium salt

certified by the Biological Stain Commission

Synonym(s):

4-(2-Hydroxy-1-naphthylazo)benzenesulfonic acid sodium salt, Acid Orange 7, Acid Orange A, Orange II, Tropaeolin 000 No. 2

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About This Item

Empirical Formula (Hill Notation):
C16H11N2NaO4S
CAS Number:
633-96-5
Molecular Weight:
350.32
Colour Index Number:
15510
Beilstein/REAXYS Number:
3898201
EC Number:
211-199-0
MDL number:
MFCD00011657
UNSPSC Code:
12171500
PubChem Substance ID:
329818910

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certified by the Biological Stain Commission

SMILES string

[Na+].Oc1ccc2ccccc2c1\N=N\c3ccc(cc3)S([O-])(=O)=O

InChI

1S/C16H12N2O4S.Na/c19-15-10-5-11-3-1-2-4-14(11)16(15)18-17-12-6-8-13(9-7-12)23(20,21)22;/h1-10,19H,(H,20,21,22);/q;+1/p-1/b18-17+;

InChI key

CQPFMGBJSMSXLP-ZAGWXBKKSA-M

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Suitability

Certified as a substitute for methyl orange in the Wilson-Ezrin method for pituitary acidophils; as a counterstain for Heidenhain′s or Weigert′s hematoxylin on paraffin sections; as a substitute for Orange G in Flemming′s triple stain.

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Certificates of Analysis (COA)

Lot/Batch Number
125K3703
103K3729
051K3697
033K3711

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Jie Wu et al.
Journal of hazardous materials, 215-216, 138-145 (2012-03-17)
A novel process in which electrochemistry (EC) was coupled with ferrous ion activation of peroxydisulfate (Fe(2+)/S(2)O(8)(2-)) was proposed for the decolorization of Acid Orange 7. In this process, the reaction between peroxydisulfate and externally added ferrous ion results in the
Penghui Shi et al.
Journal of hazardous materials, 229-230, 331-339 (2012-06-29)
The current paper investigated the removal of the azo dye Orange II from water using advanced oxidation processes based on sulfate radicals. The cobalt oxide catalyst immobilized on graphene oxide (GO) can activate peroxymonosulfate (PMS) for the degradation of Orange
Soon-An Ong et al.
Journal of environmental sciences (China), 24(2), 291-296 (2012-06-05)
We investigated the decolorization of Orange II with and without the addition of co-substrates and nutrients under an anaerobic sequencing batch reactor (ASBR). The increase in COD concentrations from 900 to 1750 to 3730 mg/L in the system treating 100
Yan-Qing Wang et al.
Journal of photochemistry and photobiology. B, Biology, 113, 14-21 (2012-05-30)
The interactions between human hemoglobin and orange I (or orange II) were investigated by UV/vis absorption, circular dichroism, fluorescence spectra techniques, and molecular modeling method. Orange I and orange II effectively quenched the intrinsic fluorescence of human hemoglobin by static
Ashish Yadav et al.
Toxicology letters, 208(3), 239-245 (2011-12-06)
Orange II, an azo dye, is not permitted in food preparations, but high levels of the dye have been detected in different food commodities. Though there are reports on the toxicity of Orange II but knowledge based on the immunomodulatory
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