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195251

Sigma-Aldrich

Direct Red 81

Dye content 50 %

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Synonym(s):
DR 81, Disodium 7-benzamido-4-hydroxy-3-[[4-[(4-sulphonatophenyl)azo]phenyl]azo]naphthalene-2-sulphonate
Empirical Formula (Hill Notation):
C29H19N5Na2O8S2
CAS Number:
Molecular Weight:
675.60
Colour Index Number:
28160
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.47

form

powder

Quality Level

composition

Dye content, 50%

mp

240 °C (dec.) (lit.)

solubility

H2O: 0.1%, dark red

λmax

397 nm
508 nm (2nd)

ε (extinction coefficient)

≥12000 at 272-278 nm in H2O at 0.01 g/L

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

room temp

SMILES string

[Na+].[Na+].Oc1c(N=Nc2ccc(cc2)N=Nc3ccc(cc3)S([O-])(=O)=O)c(cc4cc(NC(=O)c5ccccc5)ccc14)S([O-])(=O)=O

InChI

1S/C29H21N5O8S2.2Na/c35-28-25-15-12-23(30-29(36)18-4-2-1-3-5-18)16-19(25)17-26(44(40,41)42)27(28)34-33-21-8-6-20(7-9-21)31-32-22-10-13-24(14-11-22)43(37,38)39;;/h1-17,35H,(H,30,36)(H,37,38,39)(H,40,41,42);;/q;2*+1/p-2

InChI key

UFUQRRYHIHJMPB-UHFFFAOYSA-L

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1 of 4

This Item
214515O0625201316
Direct Red 81 Dye content 50 %

Sigma-Aldrich

195251

Direct Red 81

Chromotrope FB Dye content 50 %

Sigma-Aldrich

214515

Chromotrope FB

Oil Red O certified by the Biological Stain Commission

Sigma-Aldrich

O0625

Oil Red O

Quinaldine Red Dye content 95 %

Sigma-Aldrich

201316

Quinaldine Red

composition

Dye content, 50%

composition

Dye content, 50%

composition

Dye content, ≥75%

composition

Dye content, 95%

mp

240 °C (dec.) (lit.)

mp

275 °C

mp

120 °C (dec.) (lit.)

mp

-

solubility

H2O: 0.1%, dark red

solubility

-

solubility

chloroform/ethanol (1:1): 1 mg/mL

solubility

ethanol: 1 mg/mL, clear, dark red

λmax

397 nm, 508 nm (2nd)

λmax

383 nm, 515 nm (2nd)

λmax

-

λmax

528 nm

ε (extinction coefficient)

≥12000 at 272-278 nm in H2O at 0.01 g/L

ε (extinction coefficient)

≥14500 at 513-519 nm in H2O at 0.03 g/L, ≥33000 at 214-220 nm in H2O at 0.03 g/L, ≥9000 at 320-326 nm in H2O at 0.03 g/L

ε (extinction coefficient)

-

ε (extinction coefficient)

-

Biochem/physiol Actions

Bacterial consortium NBNJ6 has an ability to decolorize direct red 81 (DR81).

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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