4-[3-(4-chlorophenyl)-4,5-dihydro-1H-pyrazol-1-yl]benzenesulphonamide

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Remarks:

source of read across

Adequacy of study:

weight of evidence

Study period:

September from 03rd to 12th, 2002

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2002

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

Version / remarks:

adopted July 17, 1992

GLP compliance:

no

Remarks:

in accordance with SN EN 45001 (incl. certificate)

Test material

Test material information

Constituent 1

Reference substance name:

Similar Substance 02

IUPAC Name:

Similar Substance 02

Test animals

Species:

rabbit

Strain:

New Zealand White

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Elevage Scientifique des Dombes F-01400 Chatillon sur Chalaronne / France
- Age at study initiation: males 12 weeks, females 11 weeks.
- Diet: pelleted standard Provimi Kliba 3418 rabbit maintenance diet, ad libitum (batch no.39/02) provided by Provimi Kliba AG, CH-4303 Kaiseraugst.
- Water: community tap water from Füllinsdorf, ad libitum.
- Acclimatization: under laboratory conditions after health examination. Only animals without any visual signs of illness were used for the study.
- Animals selection: four days before treatment, one flank was clipped with an electric clipper, exposing an area of approximately 100 cm2 (10 cm x 10 cm). The skin of the animals was examined one day before treatment, and regrown fur of all animals was again clipped. Animals with overt signs of skin injury or marked irritation which may have interfered with the interpretation of the results were not used in the test.

ENVIRONMENTAL CONDITIONS
- Temperature: 17 - 23 °C
- Relative humidity: between 30-70 %
- Air changes: 10-15 air changes per hour.
- Photoperiod: 12 hours fluorescent light/12 hours dark.
- Other: music during the light period.

Test system

Type of coverage:

semiocclusive

Preparation of test site:

clipped

Vehicle:

water

Controls:

yes, concurrent no treatment

Amount / concentration applied:

- Amount: 0.5 g (per animal), moistened with approximately 0.1 ml of purified water before application
- pH: the pH of the test item was measured before the study initiation date. A formulation of 1 % in water was prepared and the pH was found to be 7.

Duration of treatment / exposure:

4 hours

Observation period:

72 hours

Number of animals:

1 male and 2 females

Details on study design:

TEST SITE
- Area of exposure: on the day of treatment, test item was placed on a surgical gauze patch (ca. 4 cm x 4 cm). This gauze patch was applied to the intact skin of the clipped area.
- Type of wrap if used: the patch was covered with a semi-occlusive dressing. The dressing was wrapped around the abdomen and anchored with tape.

REMOVAL OF TEST SUBSTANCE
- Washing: the dressing was removed and the skin was flushed with lukewarm tap water to clean the application site so that any reactions (erythema) were clearly visible at that time.
- Time after start of exposure: 4 hours

OBSERVATIONS
- Viability/Mortality: daily from delivery of the animals to the termination of test.
- Clinical signs: daily from delivery of the animals to the termination of test.
- Body weights: at start of acclimatization, on the day of application and at termination of observation.

OBSERVATION TIME POINTS
Approximately 1, 24, 48 and 72 hours after the removal of the dressing, gauze patch and test item.

SCORING SYSTEM
The skin reaction was assessed according to the numerical scoring system listed in the EEC Commission Directive 92/69/EEC, July 31, 1992.
lf evident, corrosive or staining properties of the test item were described and recorded.

ERYTHEMA AND ESCHAR FORMATION
No erythema 0
Very slight erythema 1
Well-defined erythema 2
Moderate to severe erythema 3
Severe erythema (beet redness) or eschar formation (injuries in depth preventing erythema) reading 4

OEDEMA FORMATION
No oedema 0
Very slight oedema (barely perceptible) 1
Slight oedema (edges of area well-defined by definite raising) 2
Moderate oedema (edges raised approximately 1 mm) 3
Severe oedema (raised more than 1 mm and extending beyond the area of exposure) 4

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

erythema score

Basis:

animal: 3/3

Time point:

24/48/72 h

Score:

< 2.3

Remarks on result:

no indication of irritation

Results 2

Irritation parameter:

edema score

Basis:

animal: 3/3

Time point:

24/48/72 h

Score:

< 2.3

Remarks on result:

no indication of irritation

Irritant / corrosive response data:

The test item did not elicit any skin reactions at the application site of any animal at any of the observation times (all scores 0). The individual mean score for erythema/eschar and oedema for each of the three animals was therefore 0.
No staining by the test item of the treated skin was observed.
No irreversible alterations of the treated skin were observed nor were corrosive effects evident on the skin.

Other effects:

VIABILTTY/MORTALITY/CLINICAL SIGNS
No clinical signs of systemic toxicity were observed in the animals during the study and no mortality occurred.

BODY WEIGHTS
The body weights of all rabbits were considered to be within the normal range of variability.

Applicant's summary and conclusion

Interpretation of results:

other: not classified, according to the CLP Regulation ((EC) No 1272/2008)

Conclusions:

Not irritating

Executive summary:

The primary skin irritation potential of test item was investigated by topical semiocclusive application of 0.5 g to the intact left flank of each of three young adult New Zealand White rabbits. The method and procedures followed were in accordance with those outlined into the OECD guideline 404. The duration of treatment was four hours. The scoring of skin reactions was performed 1, 24, 48 and 72 hours after removal of the dressing.

The test item did not elicit any skin reactions at the application site of any animal at any of the observation times (all scores 0). The individual mean score for erythema/eschar and oedema for each of the three animals was therefore 0. The test item caused no staining of the treated skin. No corrosive effects were noted on the treated skin of any animal at any of the measuring intervals.

Thus, the test item did not induce significant or irreversible damage to the skin.

Conclusion

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, thus the test item does not meet the criteria to be classified as irritating, according to the CLP Regulation ((EC) No 1272/2008.