Reaction products of diazotised 4,4-diaminodiphenylamine-2-sulfonic acid, subsequently coupled with 6-amino-4-hydroxynaphthalene-2-sulfonic acid, further diazotised and coupled with metaphenylendiamine, sodium salts

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From 2000 April 12, to 2000 April 26

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2000

Report date:

2000

Materials and methods

Test guideline

Test guideline 1

Qualifier:

equivalent or similar to guideline

Guideline:

EU Method B.1 (Acute Toxicity (Oral))

Test guideline 2

Qualifier:

according to guideline

Guideline:

other: Real Decree 363/1995 and Real Decree 1078/93

Principles of method if other than guideline:

Real Decree 363/1995 is the transposition of Directive 67/548/EEC in Spanish legislation

GLP compliance:

no

Remarks:

Centre certificated ISO 9001 by National Accreditation Program (N. 98-1101)

Test type:

acute toxic class method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Trisodium 6-[(2,4-diaminophenyl)azo]-3-[[4-[[4-[[7-[(2,4-diaminophenyl)azo]-1-hydroxy-3-sulphonato-2-naphthyl]azo]phenyl]amino]-3-sulphonatophenyl]azo]-4-hydroxynaphthalene-2-sulphonate

EC Number:

229-326-3

EC Name:

Trisodium 6-[(2,4-diaminophenyl)azo]-3-[[4-[[4-[[7-[(2,4-diaminophenyl)azo]-1-hydroxy-3-sulphonato-2-naphthyl]azo]phenyl]amino]-3-sulphonatophenyl]azo]-4-hydroxynaphthalene-2-sulphonate

Cas Number:

6473-13-8

Molecular formula:

C44H32N13O11S3Na3

IUPAC Name:

trisodium 6-[(2,4-diaminophenyl)azo]-3-[[4-[[4-[[7-[(2,4-diaminophenyl)azo]-1 hydroxy-3-sulphonato-2-naphthyl]azo]phenyl]amino]-3-sulphonatophenyl]azo]-4-hydroxynaphthalene-2-sulphonate

Test animals

Species:

rat

Strain:

Sprague-Dawley

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: authorized provider.
- Health: rats were submitted to a sanitary control.
- Age at study initiation: young and healthy rats
- Housing: 3 rats for every cube of Makrolon (48 x 27 x 20 cm) by Tecniplast, with bed of woodchip. Each cube has been signed by label.
- Diet: free access to specific fodder for experimental rat, supplied by authorized provider
- Water: tap water ad libitum by Makrolon bottle
- Acclimatation period: 7 days

Before starting test each rat was marked by black pen on tail


ENVIRONMENTAL CONDITIONS
- Temperature (°C): 21 ± 2
- Humidity (%): 55 ± 25
- Air changes (per hr): 15 air changes by pre-filtration of 5 µm
- Photoperiod (hrs dark / hrs light): 12/12 by timer

OTHER
Materials used:
Balance: COBOS D 6000-SX
Vinyl/latex Gloves
Syringes of 1 and 2 ml

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

water

Details on oral exposure:

PREPARATION/ADMINISTRATION OF TEST SUBSTANCE:
2000 mg of test substance were dissolved in 20 ml of water.
Administration: 2 ml/100 g of body weight. Forced administration by metallic cannula, after a fasting night.
Since 3 hours after administration, the regular diet was recovered

Doses:

2000 mg/Kg bw

No. of animals per sex per dose:

3 per 3 per dose

Control animals:

not specified

Details on study design:

- Administration: oral administration by metallic probe
- Duration of observation period following administration: 14 days
- Frequency of observations: In the first day frequent observations, and then, once every working day
- Sacrifice: yes by CO2 inhalation or cervical dislocation
- Necropsy performed: yes, macroscopic
- Body weight: performed at the start of the study, before substance administration, at 7 days after administration and at the end of the study.
- General examination: skin, fur, eyes, mucose, respiratory system, cardiovasculary system, central and periheral nervous system, somatomotor system and behaviour. A particular attention was given to tremors, convulsions, salivation, diarrhea, letargia, sleep and coma.

Results and discussion

Effect levels

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

No mortality at 2000 mg/Kg bw was observed.

Clinical signs:

other: No abnormalities were observed during the test period

Gross pathology:

No abnormalities were observed

Other findings:

No abnormalities were observed

Any other information on results incl. tables

Dead rats at 2000 mg/Kg

Rat N.	Volume administrated (ml)	Dead
ML1	3.2	0
ML2	3.2	0
ML3	3.0	0
HL1	3.1	0
HL2	3.1	0
HL3	3.1	0

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

LD50 oral rat > 2000 mg/Kg bw.

Executive summary:

Direct Black 22 was tested for oral acute toxicity according to the Real Decree 363/1995, that is the transposition of Directive 67/548/EEC in Spanish legislation.

A singular dose of 2000 mg/kg was administrated by oral gavage to rat Sprague-Dawle

Result

No mortality at 2000 mg/Kg bw was observed.