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195251

Sigma-Aldrich

Direct Red 81

Dye content 50 %

Synonym(s):

DR 81, Disodium 7-benzamido-4-hydroxy-3-[[4-[(4-sulphonatophenyl)azo]phenyl]azo]naphthalene-2-sulphonate

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About This Item

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
UNSPSC Code:
12171500
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

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

Related Categories

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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Certificates of Analysis (COA)

Lot/Batch Number
SHBR6740
SHBQ5471
SHBQ1961
SHBN3053
SHBM8407

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D P Berry et al.
Plastic and reconstructive surgery, 102(1), 124-131 (1998-07-09)
The closure of ungrafted sacrococcygeal pilonidal sinus excisional wounds was studied in 15 patients. Wound punch biopsies were taken on a regular basis, and histologic sections were made. To document changes, computer-assisted morphometric image analysis was employed. Initial average wound
R Schräpler et al.
Acta histochemica, 89(2), 237-244 (1990-01-01)
It is known that the birefringency of the collagen fibres is selectively enhanced by staining with Sirius Red. According to experiences, the most authors usually take Sirius Red F3BA as dye. We use the disazo dyestuff Solaminrot 4B produced by
Dianne M Walters et al.
Current protocols in pharmacology, Chapter 5, Unit 5-Unit 5 (2008-03-01)
Pulmonary fibrosis is a component of many interstitial lung diseases, including idiopathic pulmonary fibrosis, a chronic, progressive disease for which there is currently no effective therapy. Bleomycin has been widely used in rodents to model pulmonary fibrosis for the study
Seiichi Yamano et al.
Clinical oral implants research, 22(8), 815-819 (2011-01-05)
The purpose of the present study was to investigate the early peri-implant soft tissue healing on different titanium surface topographies. Titanium implants with smooth or rough surfaces were placed in the extraction site at 1 month after the maxillary first
J Palus et al.
International journal of occupational medicine and environmental health, 8(2), 123-130 (1995-01-01)
The genotoxic activity of the benzeneamine-derived azo dyes, Disperse Red 54 (DR 54), Direct Red 81 (DR 81) and Direct Black 19:1 (DB 19:1) was studied in the in vitro DNA repair assay in primary rat hepatocyte cultures. Hepatocytes were
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