Reaction products of diazotized 2-amino-4-nitrophenol, coupled with resorcinol and subsequently coupled with diazotized 5-amino-4-hydroxynaphthalene-2,7-disulfonic acid and diazotiazed paranitroaniline

Endpoint summary

Key value for chemical safety assessment

Skin sensitisation

Link to relevant study records

Reference

Endpoint:

skin sensitisation: in vivo (non-LLNA)

Type of information:

other: read across from supporting substance

Adequacy of study:

key study

Study period:

Since December 12,1988 to January 5, 1989

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

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

Qualifier:

according to guideline

Guideline:

EU Method B.6 (Skin Sensitisation)

Deviations:

no

Qualifier:

according to guideline

Guideline:

OECD Guideline 406 (Skin Sensitisation)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of study:

guinea pig maximisation test

Justification for non-LLNA method:

test already available

Species:

guinea pig

Strain:

Dunkin-Hartley

Sex:

male/female

Details on test animals and environmental conditions:

TEST ANIMALS
- Source: Kleintierfarm Madoerin AG
- Age at study initiation: males : 7 weeks females: 8 weeks
- Weight at study initiation: males: 416 - 461 g females: 409 - 459 g
- Housing: Individually in Makrolon type-3 cages with standard softwood bedding
- Diet : Pelleted standard Kliba 342, Batch 47188 guinea pig breeding/ maintenance diet, ad libitum.
- Water: tap water , ad libitum.
- Acclimation period: One week under test conditions after veterinary examination.

ENVIRONMENTAL CONDITIONS
- Temperature (°C):22 ± 3°C
- Humidity (%):40-70 %
- Air changes (per hr): 10-15 air changes per hour
- Photoperiod: 12 hours artificial fluorescent light/12 hours dark, music/tight period.

Route:

epicutaneous, occlusive

Vehicle:

petrolatum

Concentration / amount:

0.1, 0.3, 0.5, 1, 3 and 5 % of the test article in petrolatum

Route:

epicutaneous, occlusive

Vehicle:

petrolatum

Concentration / amount:

0.1, 0.3, 0.5, 1, 3 and 5 % of the test article in petrolatum

No. of animals per dose:

5 x sex x dose (control)
10 x sex x dose

Details on study design:

RANGE FINDING TESTS:

MAIN STUDY
A. INDUCTION EXPOSURE: injection
- No. of exposures: 6
- Test groups: 10 males and 10 females
- Control group: 5 males and 5 females
- Site: An area of dorsal skin from the scapular region (approximately 6 x 8 cm) was clipped free of hair. Three pairs of intradermal injections (0.1 ml/ site) were made at the border of a 4 x 6 cm area in the clipped region
- Concentrations: 0.1 , 0.3, 1, 3, and 5% test item in petrolatum


INDUCTION EXPOSURE: One week after the injections
- No. of exposures: 1
- Exposure period: 48 h
- Test groups: 10 males and 10 females
- Control group: 5 males and 5 females
- Site: (6 x 8 cm)
- Type of coverage: filter paper was saturated with the test article (5 % in petrolatum) and placed over the injection sites of the test animals. The patch was covered by aluminum foil and firmly secured by an elastic plaster wound round the trunk of the animal and secured with impervious adhesive tape.
- Duration: 24 hours
- Concentrations: 5% in petrolatum

B. CHALLENGE EXPOSURE: The test and control guinea-pigs were challenged two weeks after the epidermal induction application.
- No. of exposures:2
- Exposure period: approximately 24 hours later
- Test groups:10 males and 10 females
- Control group:5 males and 5 females
- Site:hair was clipped and shaved from a 5 x 5 cm area on the left and right flank of each guinea-pig.
- Type of coverage: Two patches (2 x 2 cm) of filter paper
- Concentrations:3 % in petrolatum oil
- Evaluation : 0, 24, 48 hrs

OTHER OBSERVATION:
Mortality/Viability: Once daily
Body Weights: At acclimatization start, start of application and end of test.
Symptoms (local systemic): daily
Necropsy: no
All animals were killed at the end of the test period with an intraperitoneal injection of T61 (Hoechst AG) and discarded.

Reading:

1st reading

Hours after challenge:

48

Group:

test chemical

Dose level:

0

No. with + reactions:

0

Total no. in group:

20

Clinical observations:

No systemic symptoms were observed.

Remarks on result:

other: Reading: 1st reading. . Hours after challenge: 48.0. Group: test group. Dose level: 0. No with. + reactions: 0.0. Total no. in groups: 20.0. Clinical observations: No systemic symptoms were observed..

Interpretation of results:

not sensitising

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

The test article is not a sensitizer.

Executive summary:

The purpose of this skin sensitization study was to assess the allergenic potential of the substance when administered to the skin of male and female albino guinea pigs.

For this purpose the Maximization-Test of B. Magnusson and A.M. Kligman (1969) was used. Ten animals (5 males, 5 females) were treated with the vehicle alone (petrolatum oil) and 20 animals (10 males, 10 females) were treated with the test article.

The study was conducted between December 5th and January 5th, 1989 at the RCC laboratories in 4452 Itingen/Switzerland.

If necessary prior to the first reading of the reactions, the skin was flushed with the vehicle or other solvents to clean the application site from staining produced by the test article, so that the reactions (erythema) were clearly visible at that time. Due to the unequivocal findings observed after the first challenge, no second challenge was performed.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not sensitising)

Additional information:

The skin sensitization potential for similar substance 2 was assessed (TFL, 1989).

The purpose of this skin sensitization study was to assess the allergenic potential of the substance when administered to the skin of male and female albino guinea pigs.

For this purpose the Maximization-Test of B. Magnusson and A.M. Kligman (1969) was used. Ten animals (5 males, 5 females) were treated with the vehicle alone (petrolatum oil) and 20 animals (10 males, 10 females) were treated with the test article.

Due to the unequivocal findings observed after the first challenge, no second challenge was performed. The tested substance was assessed to be not sensitizing

Therefore Acid Brown 349 is to be considered as not-sensitizing for read across with similar substance 2 and based on the QSAR prediction.

Read Across is described in detail in section 13.

Migrated from Short description of key information:

Not sensitizing

Justification for selection of skin sensitisation endpoint:

The study has been performed on a similar substance

Respiratory sensitisation

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information:

According to the CLP Regulation (EC 1272/2008), for Guinea Pig Maximisation test, substances should be classified in accordance with the following criteria:

skin sens cat 1: if < 0.1 intradermal, >30% positive animals or >0.1 to <1% intradermal, >60% positive animals

Skin sens cat 2: >0.1 to <1% intradermal >30 to <60% positive animals >1% intradermal , >30% positive animals

As there are no positive animals, the substance does not meet the criteria to be classified as skin sensitizing.

Justification for classification or non-classification

No classification for sensitisation is warranted under Regulation CE 1272/2008.