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Merck
CN

195251

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
PubChem Substance ID:
24851682
UNSPSC Code:
12171500
Colour Index Number:
28160
NACRES:
NA.47
EC Number:
220-028-9
MDL number:
MFCD00003949

Key Documents

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Product Name

Direct Red 81, Dye content 50 %

InChI key

UFUQRRYHIHJMPB-UHFFFAOYSA-L

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

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

form

powder

composition

Dye content, 50%

technique(s)

microbe id | staining: suitable

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

Quality Level

100

Related Categories

Biochem/physiol Actions

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

Storage Class

11 - Combustible Solids

wgk

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type N95 (US)

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Certificates of Analysis (COA)

Lot/Batch Number
SHBR6740
SHBQ5471
SHBQ1961
SHBN3053
SHBM8407

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Decolorization of diazo dye Direct Red 81 by a novel bacterial consortium
Junnarkar N
World Journal of Microbiology & Biotechnology, 22:2, 163-168 (2006)
H-S Wu et al.
Journal of microscopy, 231(Pt 1), 70-80 (2008-07-22)
Quantitation of connective tissue versus parenchymal tissue compartments is important in assessment of fibrosis (scarring) and its progression in liver disease. This paper presents a two-step algorithm for quantifying fibrosis in liver biopsies stained with Sirius red. With this staining
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
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
Ståle Sund et al.
Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association, 19(11), 2838-2845 (2004-09-24)
Chronic morphological changes in the kidney allograft predict long-term graft function, but there are few studies comparing different methods in assessing chronic lesions. In the present study, we evaluated allograft cortical interstitial fibrosis, and compared semiquantitative assessment with computerized image
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