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Merck
CN

C1144

Chlorazol Black

Powder

Synonym(s):

4-Amino-3-[[4′-[(2,4-diaminophenyl)azo][1,1′-biphenyl]-4-yl]azo]-5-hydroxy-6-(phenylazo)-2,7-naphthalenedisulfonic acid disodium salt, Chlorazole Black E, Direct Black 38

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About This Item

Empirical Formula (Hill Notation):
C34H25N9Na2O7S2
CAS Number:
1937-37-7
Molecular Weight:
781.73
NACRES:
NA.47
PubChem Substance ID:
24892361
UNSPSC Code:
12171500
EC Number:
217-710-3
MDL number:
MFCD00066363
Colour Index Number:
30235

Key Documents

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Product Name

Chlorazol Black,

InChI key

XRPLBRIHZGVJIC-UVHCWRHYSA-L

InChI

1S/C34H27N9O7S2.2Na/c35-22-10-15-27(26(36)18-22)41-38-24-11-6-19(7-12-24)20-8-13-25(14-9-20)40-42-32-28(51(45,46)47)16-21-17-29(52(48,49)50)33(34(44)30(21)31(32)37)43-39-23-4-2-1-3-5-23;;/h1-18,44H,35-37H2,(H,45,46,47)(H,48,49,50);;/q;2*+1/p-2/b41-38+,42-40+,43-39+;;

SMILES string

[Na+].[Na+].Nc1ccc(\N=N\c2ccc(cc2)-c3ccc(cc3)\N=N\c4c(N)c5c(O)c(\N=N\c6ccccc6)c(cc5cc4S([O-])(=O)=O)S([O-])(=O)=O)c(N)c1

form

powder

composition

Dye content, ≥45% (based on Nitrogen)

color

dark brown to black

solubility

H2O: 1 mg/mL

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

room temp

Quality Level

200

Related Categories

General description

Chlorazol Black has strong affinity for cellulose and chitin. In plant tissues, it helps to differentiate between cellulose and lignin. It also helps in distinguishing fungal bodies from artefacts due to chitin staining. It is also used as an auxiliary stain for chromosomes.

Application

Chlorazol Black has been used to monitor the infection of mycorrhizal Allium porrum in plant roots. It has also been used for the staining of copepods.

pictograms

Health hazardExclamation mark
GHS08,GHS07

signalword

Danger

Hazard Classifications

Carc. 1B - Eye Irrit. 2 - Repr. 2

Storage Class

6.1C - Combustible acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects

wgk

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type P2 (EN 143) respirator cartridges

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Certificates of Analysis (COA)

Lot/Batch Number
SHBS2080
SHBM4400
MKCD3320
SLBR5011V
SLBN7918V

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Mutagenic activation of the benzidine-based dye direct black 38 by human intestinal microflora.
C E Cerniglia et al.
Mutation research, 175(1), 11-16 (1986-09-01)
Jianyong An et al.
The New phytologist, 224(1), 396-408 (2019-05-31)
Plants form a mutualistic symbiosis with arbuscular mycorrhizal (AM) fungi, which facilitates the acquisition of scarce minerals from the soil. In return, the host plants provide sugars and lipids to its fungal partner. However, the mechanism by which the AM
R P Bos et al.
Toxicology, 40(2), 207-213 (1986-08-01)
The role of the rat intestinal flora in the azo reduction of some benzidine-based dyes was studied in vitro and in vivo. The formation of benzidine was measured after anaerobic incubation of direct black 38, direct blue 6 and direct
Mercedes Conradi et al.
ZooKeys, (791), 71-95 (2018-11-06)
Spaniomolgus is a symbiotic genus of copepods of the poecilostomatoid family Rhynchomolgidae and is known to be associated with shallow-water reef-building hermatypic corals. Three species of this genus were previously found only in washings of Acropora and Stylophora in northern
Asterocheres hirsutus, a new species of parasitic copepod (Siphonostomatoida: Asterocheridae) associated with an Antarctic hexactinellid sponge.
Bandera M, et al.
Helgoland Marine Research , 59, 315-315 (2005)
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