2,2'-[[5-acetamido-4-[(2-bromo-4,6-dinitrophenyl)azo]-2-methoxyphenyl]imino]diethyl diacetate

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1986

Report date:

1986

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

2,2'-[[5-acetamido-4-[(2-bromo-4,6-dinitrophenyl)azo]-2-methoxyphenyl]imino]diethyl diacetate

EC Number:

222-813-1

EC Name:

2,2'-[[5-acetamido-4-[(2-bromo-4,6-dinitrophenyl)azo]-2-methoxyphenyl]imino]diethyl diacetate

Cas Number:

3618-72-2

Molecular formula:

C23H25BrN6O10

IUPAC Name:

2-{[2-(acetyloxy)ethyl]({4-[ (E)-2-(2-bromo-4,6-dinitrophenyl)diazen-1-yl]-5acetamido-2-methoxyphenyl})amino}ethyl acetate

Test material form:

solid

Test animals

Species:

rabbit

Strain:

New Zealand White

Details on test animals or test system and environmental conditions:

Three New Zealand white rabbits were supplied by Nottingham University, School of Agriculture, Sutton Bonington, Leicestershire, U.K. At the start of the study the animals weighed 2.49 - 2.78 kg and were approximately twelve to sixteen weeks old. After a minimum acclimatisation period
of five days each animal was given a number unique within the study written on the inner sunface of the ear and on a cage label using a black indelible marker pen.
The animals were individually housed in suspended metal cages. Free access to mains drinking water and food ( Rabbi t Diet, Special Diet Services Limited, Witham, Essex, U.K. ) was allowed throughout the study.

The animal room was maintained at a temperature of 19-23 °C and relative humidity of 50 - 60 %. The rate of air exchange was approximately 15 changes per hour and the Iighting was controlled by a time switch to give 12 hours light and 12 hours darkness.

Test system

Type of coverage:

semiocclusive

Preparation of test site:

clipped

Vehicle:

water

Amount / concentration applied:

A quantity of 0.5 g of the test material moistened with 0.5 mL of distiIIed water

Duration of treatment / exposure:

4 h

Details on study design:

Approximately twenty-four hours prior to the commencement of the test, each of a group of three rabbits was prepared by closely cìipping the fur from the dorsal/flank areas using veterinary clippers. Only animals with a healthy intact epidermis by gross observation were selected for the study.

The moistened sample was introduced under a 2.5 cm x 2.5 cm gauze patch and placed in position on the shorn skin. The patch was secured in
position over the test material with two lengths of adhesive strapping (SLEEK) in the form of a cross. To prevent the animals from interfering with the patches the trunk of each rabbit was wrapped in an elasticated corset (TUBIGRIP ) and the animals were returned to their cages for the duration of
the exposure period.

Four hours after application the corset and patches were removed from each animal and any residual test material removed by gentle swabbing with cotton wool soaked in distilled water followed by ether. Approximately one hour following removal of the patches , and 24, 48 and 72 hours later, the test sites were examined for evidence of primary irritation and scored according to the following scale i.e. Draize score.

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

erythema score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0.3

Max. score:

4

Reversibility:

fully reversible within: 48 hours

Results 2

Irritation parameter:

erythema score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Max. score:

4

Results 3

Irritation parameter:

erythema score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0

Max. score:

4

Results 4

Irritation parameter:

edema score

Basis:

mean

Remarks:

all animals

Time point:

24/48/72 h

Score:

0

Max. score:

4

Irritant / corrosive response data:

No erythema or edema was noted at any test site one hour after removal of the patches. Two of the three test sites continued to show no irritation throughout the study period. Very slight erythema was noted at one treated skin site at the 24-hour observation; no irritation was noted at subsequent
observations. AlI treated skin sites showed faint yelIow staining one to 48 hours after treatment. This did not affect assessment of skin reactions.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

The substance was tested for skin irritation potential following OECD 404. Under the experimental conditions no skin irritation was observed.

Executive summary:

A study was conducted to determine the skin irritation/corrosion potential of the test substance according to OECD Guideline 404. The clipped dorsal flank (2.5 x 2.5 cm) of three New-Zealand white rabbits was exposed to 500 mg test substance (97.4% purity) moistened with 0.5 mL of distilled water under semi-occlusive conditions. Four hours after application, the patches were removed and the treated skin area was carefully cleaned with cotton wool soaked in distilled water followed by ether. Approximately 1 h following removal of the patches, then 24, 48 and 72 h later, the test sites were examined for evidence of primary irritation and scored according to the Draize system. No erythema or edema was noted at any test site 1 h after removal of the patches. Two of the three test sites continued to show no irritation throughout the study period. Very slight erythema was noted at one treated skin site at the 24 h observation; no irritation was noted at subsequent time points. All treated skin sites showed faint yellow staining 1 to 48 h after treatment. This did not affect assessment of skin reactions. Under the study conditions, the test substance was not considered to be irritating to skin (Archroma, 1986).