195251

All Photos(3)

195251

Direct Red 81

Dye content 50 %

All Photos(3)

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:

2610-11-9

Molecular Weight:

675.60

Colour Index Number:

28160

EC Number:

220-028-9

MDL number:

MFCD00003949

PubChem Substance ID:

24851682

NACRES:

NA.47

form

powder

Quality Level

100

composition

Dye content, 50%

mp

240 °C (dec.) (lit.)

solubility

H₂O: 0.1%, dark red

λ_max

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

Related Categories

Hematology Stains

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This Item	365548	201871	D2535
Sigma-Aldrich 195251 Direct Red 81	Sigma-Aldrich 365548 Direct Red 80	Sigma-Aldrich 201871 Direct yellow 27	Sigma-Aldrich D2535 Direct Blue 15
form powder	form powder	form powder	form powder
composition Dye content, 50%	composition Dye content, 25%	composition -	composition Dye content, ~40%
mp 240 °C (dec.) (lit.)	mp -	mp -	mp -
solubility H₂O: 0.1%, dark red	solubility -	solubility -	solubility water: 10 mg/mL, clear, blue
λ_max 397 nm, 508 nm (2nd)	λ_max 528 nm	λ_max 393 nm	λ_max -
ε (extinction coefficient) ≥12000 at 272-278 nm in H₂O at 0.01 g/L	ε (extinction coefficient) ≥12000 at 277-283 nm in H₂O, ≥15000 at 223-235 nm in H₂O, ≥32000 at 524-530 nm in H₂O	ε (extinction coefficient) 53000-57000 at 224-230 nm in water at 0.02 g/L	ε (extinction coefficient) -

Biochem/physiol Actions

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

Storage Class Code

13 - Non 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

Certificate of Analysis

Enter Lot Number to search for Certificate of Analysis (COA).

Certificate of Origin

Enter Lot Number to search for Certificate of Origin (COO).

Direct Red 81

Dye content 50 %

Properties