2-[[3-acetamido-4-[(2-chloro-4-nitrophenyl)azo]phenyl](2-cyanoethyl)amino]ethyl acetate

Endpoint summary

Description of key information

Not skin irritating

Not eye irritating

Key value for chemical safety assessment

Skin irritation / corrosion

Link to relevant study records

Reference

Endpoint:

skin irritation: in vivo

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

comparable to guideline study with acceptable restrictions

Justification for type of information:

The read across approach is detailed into the document attached into the IUCLID section 13.

Reason / purpose for cross-reference:

read-across source

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

GLP compliance:

no

Species:

rabbit

Strain:

New Zealand White

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Housing: aII animals were housed in single cages.
- Diet: ad libitum. The batch of the diet used for this study was analysed for chemical and microbiological contaminants.
- Water: e.g. ad libitum.
- Health check: 24 hours prior to the test, the skin on the back of the animals was clipped by means of an electric clipper and the skin was investigated for pre-existing injuries.
- Acclimation period: all animals were acclimatized to the environment for a period of five days prior to the start of the study.

ENVIRONMENTAL CONDITIONS
- Temperature: 23 ± 2 °C
- Humidity: 50 ± 10 %
- Air changes: maintained at approximately 15 changes/hour.
- Photoperiod: light/dark cycle was 12 hours.

Type of coverage:

occlusive

Preparation of test site:

other: intact and abraded skin

Vehicle:

other: DMSO

Remarks:

the test item was prepared immediately before dosing

Controls:

yes, concurrent no treatment

Amount / concentration applied:

1.0 ml of the solution.

Duration of treatment / exposure:

24 hours

Observation period:

72 hours

Number of animals:

Three males and three females

Details on study design:

TEST SITE
- Area of exposure: test item was introduced under a square patch of surgical gauze, measuring 6.5 cm^2.
- Type of wrap if used: the animals vrere immobilzed with patches secured in place by a plastic patch and the entire trunk was wrapped with a plastic sleeve.

SCORING SYSTEM
After 24 hours, the patches were removed and the resulting reactions were evaluated on the basis of the code of Federal Regulation, title 16, Section 1500.41.

Irritation parameter:

erythema score

Basis:

animal: 6/6

Time point:

24/48/72 h

Score:

< 2.3

Remarks on result:

no indication of irritation

Remarks:

in none of the animals

Irritation parameter:

edema score

Basis:

animal: 6/6

Time point:

24/48/72 h

Score:

< 2.3

Remarks on result:

no indication of irritation

Remarks:

in none of the animals

Irritant / corrosive response data:

The irritation score resulted to be 0.
Test item resulted to be non irritant according to the systen of classification recommended by the ETAD Subcommittee for toxicity.

Interpretation of results:

other: not classified, according to the CLP Regulation (EC 1272/2008)

Conclusions:

Not irritating

Executive summary:

Six rabbits (three males and three females) were used to test the skin irritation potential of the substance. The abraded and intact skin of rabbits was treated with 1.0 ml of test solution. The irritation was measured by patch test technique on the intact skin. After 4 hours, the patches were removed and the resulting reactions were evaluated on the basis of the code of Federal Regulations, Title 16, Section 1500.41.

None of the animals showed any observable response to treatment throughout the 72 hours observation period.

The irritation score was 0.0 and the substance has been judged to be non irritating, according to the ETAD-Subcommittee for Toxicology.

Conclusion

The scoring system criteria used to record the hardness of the skin reactions followed in the current test are the same as those reported into the OECD guideline, therefore it is possible to re-evaluate the results in accordance with the CLP Regulation (EC 1272/2008).

None of the animals showed any observable response to treatment throughout the 72 hours observation period, thus it can be concluded that the test item does not meet the criteria to be classified as irritating, according to the CLP Regulation (EC 1272/2008).

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Eye irritation

Link to relevant study records

Reference

Endpoint:

eye irritation: in vivo

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

comparable to guideline study with acceptable restrictions

Justification for type of information:

The read across approach is detailed into the document attached into the IUCLID section 13.

Reason / purpose for cross-reference:

read-across source

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 405 (Acute Eye Irritation / Corrosion)

GLP compliance:

no

Specific details on test material used for the study:

Powdered formulation.

Species:

rabbit

Strain:

New Zealand White

Details on test animals or tissues and environmental conditions:

TEST ANIMALS
- Housing: aII animals were housed in single cages.
- Diet: a standard laboratory diet was provide ad libitum. The batch of the diet used for this study was analysed for chemical and microbiological contaminants.
- Water: e.g. ad libitum.
- Health check: prior to the test, the eyes of each rabbit were examined for pre-existing casual injury.
- Acclimation period: all animals were acclimatized to the environment for a period of five days prior to the start of the study.

ENVIRONMENTAL CONDITIONS
- Temperature: 23 ± 2 °C
- Humidity: 50 ± 10 %
- Air changes: maintained at approximately 15 changes/hour.
- Photoperiod: light/dark cycle was 12 hours.

Vehicle:

unchanged (no vehicle)

Controls:

yes, concurrent no treatment

Amount / concentration applied:

100 mg of the test material was placed into the conjunctival sac of the right eyes of the animals.

Observation period (in vivo):

72 hours

Number of animals or in vitro replicates:

Nine rabbits: six rabbits for unwashed eyes and three addtional rabbits whose eyes were washed after instillation.

Details on study design:

REMOVAL OF TEST SUBSTANCE
- Washing: in three animals, the treated eye was rinsed with 20 ml lukewarm water.
- Time after start of exposure: after half a minute.

OBSERVATION TIME
The eyes were inspected after 24, 48 and 72 hours.

SCORING SYSTEM:
Reading score for ocular lesions were made according to the recommendations of the USA Food and Drug officials, published in 1959 (Appraisal of the Safety of Chemicals in Foods, Drugs and Cosmetics).

Irritation parameter:

cornea opacity score

Basis:

animal: 9/9

Time point:

24/48/72 h

Score:

< 1

Remarks on result:

no indication of irritation

Remarks:

in none of the animals

Irritation parameter:

iris score

Basis:

animal: 9/9

Time point:

24/48/72 h

Score:

< 1

Remarks on result:

no indication of irritation

Remarks:

in none of the animals

Irritation parameter:

conjunctivae score

Basis:

animal: 9/9

Time point:

24/48/72 h

Score:

< 2

Remarks on result:

no indication of irritation

Remarks:

in none of the animals

Irritation parameter:

chemosis score

Basis:

animal: 9/9

Time point:

24/48/72 h

Score:

< 2

Remarks on result:

no indication of irritation

Remarks:

in none of the animals

Irritant / corrosive response data:

The irritation score resulted to be 0.
Test item resulted to be non irritant according to the systen of classification recommended by the ETAD Subcommittee for toxicity.

Reactions - unwashed eyes

Animal	Reaction		24 hrs	48 hrs	72 hrs
Male 701	Cornea	(A) density	0	0	0
		(B) area	0	0	0
		A×B×5	0	0	0
	Iris	(C)	0	0	0
		C×5	0	0	0
	Conjunctiva	(D) secretion	0	0	0
		(E) swelling	0	0	0
		(F) redness	0	0	0
		(D+E+F)×2	0	0	0
Male 702	Cornea	(A) density	0	0	0
		(B) area	0	0	0
		A×B×5	0	0	0
	Iris	(C)	0	0	0
		C×5	0	0	0
	Conjunctiva	(D) secretion	0	0	0
		(E) swelling	0	0	0
		(F) redness	0	0	0
		(D+E+F)×2	0	0	0
Male 703	Cornea	(A) density	0	0	0
		(B) area	0	0	0
		A×B×5	0	0	0
	Iris	(C)	0	0	0
		C×5	0	0	0
	Conjunctiva	(D) secretion	0	0	0
		(E) swelling	0	0	0
		(F) redness	0	0	0
		(D+E+F)×2	0	0	0
Male 704	Cornea	(A) density	0	0	0
		(B) area	0	0	0
		A×B×5	0	0	0
	Iris	(C)	0	0	0
		C×5	0	0	0
	Conjunctiva	(D) secretion	0	0	0
		(E) swelling	0	0	0
		(F) redness	0	0	0
		(D+E+F)×2	0	0	0
Male 705	Cornea	(A) density	0	0	0
		(B) area	0	0	0
		A×B×5	0	0	0
	Iris	(C)	0	0	0
		C×5	0	0	0
	Conjunctiva	(D) secretion	0	0	0
		(E) swelling	0	0	0
		(F) redness	0	0	0
		(D+E+F)×2	0	0	0
Male 706	Cornea	(A) density	0	0	0
		(B) area	0	0	0
		A×B×5	0	0	0
	Iris	(C)	0	0	0
		C×5	0	0	0
	Conjunctiva	(D) secretion	0	0	0
		(E) swelling	0	0	0
		(F) redness	0	0	0
		(D+E+F)×2	0	0	0

Reactions - washed eyes

Animal	Reaction		24 hrs	48 hrs	72 hrs
Male 707	Cornea	(A) density	0	0	0
		(B) area	0	0	0
		A×B×5	0	0	0
	Iris	(C)	0	0	0
		C×5	0	0	0
	Conjunctiva	(D) secretion	0	0	0
		(E) swelling	0	0	0
		(F) redness	0	0	0
		(D+E+F)×2	0	0	0
Male 708	Cornea	(A) density	0	0	0
		(B) area	0	0	0
		A×B×5	0	0	0
	Iris	(C)	0	0	0
		C×5	0	0	0
	Conjunctiva	(D) secretion	0	0	0
		(E) swelling	0	0	0
		(F) redness	0	0	0
		(D+E+F)×2	0	0	0
Male 709	Cornea	(A) density	0	0	0
		(B) area	0	0	0
		A×B×5	0	0	0
	Iris	(C)	0	0	0
		C×5	0	0	0
	Conjunctiva	(D) secretion	0	0	0
		(E) swelling	0	0	0
		(F) redness	0	0	0
		(D+E+F)×2	0	0	0

Interpretation of results:

other: not classified, according to the CLP Regulation (EC 1272/2008)

Conclusions:

Not irritating

Executive summary:

Nine rabbits (New Zealand White Rabbits) were used in the test: six animals for unwashed eyes and three animals whose eyes were washed after instillation. Prior to the test, the eyes of each rabbit were examined for pre-existing casual injury.

100 mg of the test material was placed into the conjunctival sac of the right eyes of the animals. In three animals, the treated eye was rinsed after half a minute. The eyes were inspected after 24, 48 and 72 hours. Reading score for ocular lesions were made according to the recommendations of the USA Food and Drug officials, published in 1959 (Appraisal of the Safety of Chemicals in Foods, Drugs and Cosmetics).

The irritation score resulted to be 0, thus, the test item was judged to be non irritant, according to the systen of classification recommended by the ETAD Subcommittee for toxicity.

Conclusion

The scoring system criteria used to record the hardness of the skin reactions followed in the current test are strictly comparable to those reported into the OECD guideline, therefore it is possible to re-evaluate the results in accordance with the CLP Regulation (EC 1272/2008).

None of the animals showed any observable response to treatment throughout the 72 hours observation period, thus it can be concluded that the test item does not meet the criteria to be classified as irritating, according to the CLP Regulation (EC 1272/2008).

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Respiratory irritation

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

SKIN IRRITATION

There are no experiments on the skin irritation potential of Disperse Red 202, thus, available data on the structural analogue Similar Substance 02 has been taken into consideration. The read across approach can be considered as suitable and appropriate to investigate the property, as detailed into the IUCLID section 13.

The potential for skin irritation of Similar Substance 02 was assessed in rabbits. The irritation was measured by patch test technique on the intact and abraded skin. The reactions were evaluated on the basis of the code of Federal Regulations, Title 16, Section 1500.41. None of the animals showed any observable response to treatment throughout the 72 hours observation period. The irritation score was 0.0 and the substance has been judged to be non irritating, according to the ETAD-Subcommittee for Toxicology.

EYE IRRITATION

There are no experiments on the eye irritation potential of Disperse Red 202, thus, available data on the structural analogue Similar Substance 02 has been taken into consideration. The read across approach can be considered as suitable and appropriate to investigate the property, as detailed into the IUCLID section 13.

The potential for eye irritation of Similar Substance 02 was assessed in rabbits. Nine animals were used in the test: six animals for unwashed eyes and three animals whose eyes were washed after instillation. The eyes were inspected after 24, 48 and 72 hours and the reading score for ocular lesions were made according to the recommendations of the USA Food and Drug officials, published in 1959 (Appraisal of the Safety of Chemicals in Foods, Drugs and Cosmetics).

The irritation score resulted to be 0, thus, the test item was judged to be non irritant, according to the systen of classification recommended by the ETAD Subcommittee for toxicity.

Justification for classification or non-classification

According to the CLP Regulation (EC 1272/2008), 3.2 Skin corrosion/irritation section, skin irritation means the production of reversible damage to the skin following the application of a test substance for up to 4 hours.

The mean values from gradings at 24, 48 and 72 hours after patch removal were lower than 2.3 in all animals for both erythema/eschar and oedema reactions.

According to the CLP Regulation (EC 1272/2008), serious eye damage means the production of tissue damage in the eye, or serious physical decay of vision, following application of a test substance, which is not fully reversible within 21 days of application.

The mean values from gradings at 24, 48 and 72 hours were lower than 1 for corneal opacity, lower than 1 for iritis, lower than 2 for both conjunctival redness and oedema, in all of the tested animals.

In conclusion, the substance does not meet the criteria to be classified for eye/skin irritation, according to the CLP Regulation (EC 1272/2008).