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Toxicological information

Skin irritation / corrosion

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Administrative data

Endpoint:
skin irritation: in vivo
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Testing was conducted between the 10th June 2014 and 13th June 2014
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2014
Report Date:
2014

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 404 (Acute Dermal Irritation / Corrosion)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method B.4 (Acute Toxicity: Dermal Irritation / Corrosion)
Deviations:
no
GLP compliance:
yes (incl. certificate)

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
other: red solid
Details on test material:
Information as provided by the Sponsor.

Identification: FAT 40863/A TE
Sponsor description: yellowish to brown solid
Harlan description: red solid
Batch: BOP 02-13 (BS-ROE1670)
Purity: 82.1% w/w
Expiry date: 05 June 2018
Storage Conditions: room temperature in the dark

Test animals

Species:
rabbit
Strain:
New Zealand White
Details on test animals and environmental conditions:
Animals and Animal Husbandry:
Two New Zealand White (Hsdlf:NZW) strain rabbits were supplied by Harlan Laboratories UK Ltd., Leicestershire, UK. At the start of the study the animals weighed 3.28 or 3.52 kg and were twelve to twenty weeks old. After an acclimatization period of at least five days each animal was given a number unique within the study which was written with a black indelible marker pen on the inner surface of the ear and on the cage label.

The animals were individually housed in suspended cages. Free access to mains drinking water and food (2930C Teklad Global Rabbit diet supplied by Harlan Laboratories UK Ltd., Oxon, UK) was allowed throughout the study. The diet and drinking water were considered not to contain any contaminant of a level that might have affected the purpose or integrity of the study.

The temperature and relative humidity were set to achieve limits of 17 to 23 °C and 30 to 70% respectively. The rate of air exchange was at least fifteen changes per hour and the lighting was controlled by a time switch to give twelve hours continuous light (06:00 to 18:00) and twelve hours darkness.

The animals were provided with environmental enrichment items which were considered not to contain any contaminant of a level that might have affected the purpose or integrity of the study.


Justification:
The rabbit is the preferred species of choice as historically used for irritation studies and is specified in the appropriate test guidelines. The number of animals used was the minimum required to achieve the objectives of the study. Testing was conducted in two animals and the response in those animals was such that exposure of a third animal would not affect classification of the test item, no further testing was needed.

Test system

Type of coverage:
semiocclusive
Preparation of test site:
clipped
Vehicle:
unchanged (no vehicle)
Remarks:
The test item was moistened sufficiently with 0.5 ml of distilled water.
Controls:
no
Amount / concentration applied:
TEST MATERIAL
- Amount(s) applied (volume or weight with unit):
0.5 g

- Concentration (if solution):
Not applicable.

VEHICLE
- Amount(s) applied (volume or weight with unit): Not applicable, for the purpose of the study the test item was used as supplied.

- Concentration (if solution):
Not applicable.

- Lot/batch no. (if required):
Not given in study report.
Duration of treatment / exposure:
4 hours
Observation period:
72 hours
Number of animals:
2 females
Details on study design:
TEST SITE
- Area of exposure:
On the day of the test a suitable test site was selected on the back of each rabbit.

- % coverage:
Not given in study report.

- Type of wrap if used:
Test material was introduced under a 2.5 cm x 2.5 cm cotton gauze patch and placed in position on the shorn skin. The patch was secured in position with a strip of surgical adhesive tape. To prevent the animals interfering with the patches, the trunk of each rabbit was wrapped in an elasticated corset and the animals were returned to their cages for the duration of the exposure period.

REMOVAL OF TEST SUBSTANCE
- Washing (if done):
Any residual test material removed by gentle swabbing with cotton wool soaked in distilled water.

- Time after start of exposure:
4 hours.

SCORING SYSTEM:
Approximately one hour following the 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 table of evaluation of skin reactions (which can be found in the any other information on methods, including tables section).

Results and discussion

In vivo

Resultsopen allclose all
Irritation parameter:
erythema score
Basis:
animal: 74371 female
Time point:
other: Mean score at 24, 48 and 72 hours
Score:
0
Max. score:
4
Reversibility:
other: No evidence of skin irritation
Irritation parameter:
erythema score
Basis:
animal: 74372 female
Time point:
other: Mean at 24, 48 and 72 hours
Score:
0
Max. score:
4
Reversibility:
other: No evidence of skin irritation
Irritation parameter:
edema score
Basis:
animal: 74371 female
Time point:
other: mean of 24, 48 and 72 hours
Score:
0
Max. score:
4
Reversibility:
other: No evidence of skin irritation
Irritation parameter:
edema score
Basis:
animal: 74372 female
Time point:
other: mean at 24, 48 and 72 hours
Score:
0
Max. score:
4
Reversibility:
other: No evidence of skin irritation
Irritant / corrosive response data:
The individual scores for erythema/eschar and edema are given in Table 1 (please see below in any other information on results section).

Orange colored staining, not preventing evaluation of skin responses, was noted at the test sites of both animals throughout the study.
Other effects:
Both animals showed expected gain in body weight during the study.

Any other information on results incl. tables

Table 1     Individual Skin Reactions:

Skin Reaction

Observation Time
(following patch removal)

Individual Scores –
Rabbit Number and Sex

Total

74371 Female

74372 Female

Erythema/Eschar Formation

Immediately

0STA

0STA

(0 )

1 Hour

0STA

0STA

( 0 )

24 Hours

0STA

0STA

0

48 Hours

0STA

0STA

( 0 )

72 Hours

0STA

0STA

0

Edema Formation

Immediately

0

0

( 0 )

1 Hour

0

0

( 0 )

24 Hours

0

0

0

48 Hours

0

0

( 0 )

72 Hours

0

0

0

Sum of 24 and 72‑Hour Readings (S) :        0

Primary Irritation Index (S/4)              :        0/4 = 0.0

Classification                                       :        NON‑IRRITANT

 


(   ) =    Total values not used for calculation of primary irritation index

STA =   Orange coloured staining

Applicant's summary and conclusion

Interpretation of results:
not irritating
Remarks:
Migrated information Criteria used for interpretation of results: EU
Conclusions:
The test item produced a primary irritation index of 0.0, when tested on 2 females in an in-vivo skin irritation study (OECD guideline 404). The substance was classified as a non irritant to rabbit skin according to the Draize classification scheme. No corrosive effects were noted.

The test item does not meet the criteria for classification according to Regulation (EC) No 1272/2008, relating to the Classification, Labelling and Packaging of Substances and Mixtures.
Executive summary:

Introduction:

The study was performed to assess the irritancy potential of the test item to the skin of the New Zealand White rabbit.

 

Results:

A single 4‑Hour, semi‑occluded application of the test item to the intact skin of two rabbits produced no evidence of skin irritation.

 

Conclusion:

The test item produced a primary irritation index of 0.0 and was classified as non‑irritant to rabbit skin according to the Draize classification scheme. No corrosive effects were noted.

 

The test item does not meet the criteria for classification according to Regulation (EC) No 1272/2008, relating to the Classification, Labelling and Packaging of Substances and Mixtures.