Xylidine Ponceau 2R

Description

Xylidine Ponceau 2R · CAS 3761-53-3 · C18H14N2Na2O7S2. Solubility: 1 to 10 mg/mL at 68 °F (NTP, 1992).

Identification

CAS Registry Number	3761-53-3
PubChem CID	19579
Molecular formula	C18H14N2Na2O7S2
IUPAC name	disodium;4-[(2,4-dimethylphenyl)diazenyl]-3-hydroxynaphthalene-2,6-disulfonate

Computed Descriptors

Molecular Weight	480.4
Hydrogen Bond Donor Count	1
Hydrogen Bond Acceptor Count	9
Rotatable Bond Count	2
Exact Mass	480.00378170
Monoisotopic Mass	480.00378170
Topological Polar Surface Area	176
Heavy Atom Count	31
Formal Charge	0
Complexity	791

Physical & Chemical Properties

Solubility	1 to 10 mg/mL at 68 °F (NTP, 1992)

Physical description & handling notes

• C.i. food red 5 appears as dark red crystals or red powder. (NTP, 1992)
• greater than 572 °F (NTP, 1992)

Regulatory Status

Regulatory & Food Contact	COLOUR: Food Additives CI ACID RED 26 NMRS 38/TRS 309-JECFA 8/23 CI FOOD RED 5

Documented Uses

• Substance listed with specific concentration in tattoo ink and/or permanent make up according to EU Commission Regulation 2020/2081. The concentration limit (by weight) is 0.1%.
• Food Additives -> COLOUR -> JECFA Functional Classes
• 2,7-Naphthalenedisulfonic acid, 4-[2-(2,4-dimethylphenyl)diazenyl]-3-hydroxy-, sodium salt (1:2): ACTIVE

Synonyms

DTXSID8021228; RefChem:1076034; DTXCID301474356; 3761-53-3; 4-((2,4-Dimethylphenyl)azo)-3-hydroxy-2,7-naphthalenedisulfonic acid, disodium salt; Acid Red 26; C.I. Food Red 5; CHEBI:82369; Ponceau de xylidine; Ponceau Red R; SCHEMBL133302; SCHEMBL1637104; OIQRYZXXBZHDRY-NNIZZXHBSA-L; Disodium;4-[(2,4-dimethylphenyl)diazenyl]-3-hydroxynaphthalene-2,6-disulfonate; C.I. 16150,; D91977

Frequently Asked Questions

What are the CAS number and molecular formula of Xylidine Ponceau 2R?

CAS 3761-53-3; molecular formula C18H14N2Na2O7S2; molecular weight — g/mol.

What other names is Xylidine Ponceau 2R known by?

DTXSID8021228, RefChem:1076034, DTXCID301474356, 3761-53-3, 4-((2,4-Dimethylphenyl)azo)-3-hydroxy-2,7-naphthalenedisulfonic acid, disodium salt, Acid Red 26.

What is the regulatory status of Xylidine Ponceau 2R?

Documented regulatory listings: COLOUR: Food Additives; CI ACID RED 26; NMRS 38/TRS 309-JECFA 8/23.

What are the key physical properties of Xylidine Ponceau 2R?

Solubility: 1 to 10 mg/mL at 68 °F (NTP, 1992).

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.