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Toxicological information

Skin irritation / corrosion

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Administrative data

Endpoint:
skin irritation: in vivo
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Study period:
The study was performed between 24 June 2010 and 08 July 2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: A GLP study conducted to current guidelines with no or minor deviations considered not to affect the integrity of the results.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2010

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
other: OECD Guideline 402 (Acute Dermal Toxicity)
Deviations:
no
Qualifier:
according to
Guideline:
other: EU Method B.3 (Acute Toxicity (Dermal))
Deviations:
no
GLP compliance:
yes (incl. certificate)

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
Sponsor's identification : CAS No 77-58-7
Description : clear colourless liquid
Batch number : LA6K05N001
Date received : 26 March 2010
Expiry date : 26 March 2011
Storage conditions : approximately 4°C in the dark, under nitrogen
The integrity of supplied data relating to the identity, purity and stability of the test material is the responsibility of the Sponsor.

Test animals

Species:
rat
Strain:
other: Wistar (HsdRccHan:WIST)
Details on test animals and environmental conditions:
TEST ANIMALS
- Source: Harlan Laboratories U.K. Ltd., Oxon, UK
- Age at study initiation: eight to twelve weeks
- Weight at study initiation: at least 200 g (the weight variation did not exceed ± 20% of the mean weight for each sex)
- Housing: The animals were housed in suspended solid-floor polypropylene cages furnished with woodflakes. The animals were housed individually during the 24 hour exposure period and in groups of five by sex for the remainer of the study.
- Diet : Free access to 2014 Teklad Global Rodent diet supplied by Harlan Laboratories U.K. Ltd., Oxon, UK
- Water : Free access to mains drinking water
- Acclimation period: At least five days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 19-25 °C
- Humidity (%): 30-70%
- Air changes (per hr): The rate of air exchange was at least fifteen changes per hour
- Photoperiod (hrs dark / hrs light): 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.
The diet, drinking water and bedding were routinely analysed and were considered not to contain any contaminants that could reasonably be expected to affect the purpose or integrity of the study.

Test system

Type of coverage:
semiocclusive
Preparation of test site:
shaved
Vehicle:
unchanged (no vehicle)
Controls:
no
Amount / concentration applied:
TEST MATERIAL
- Amount(s) applied : 2000 mg/kg, dose volume 1.91 mL/kg

For the purpose of the study the test material was used as supplied. The specific gravity was determined and used to calculate the appropriate dose volume for the required dose level.
The absorption of the test material was not determined.
Duration of treatment / exposure:
24 hours
Observation period:
14 days
Number of animals:
10 (5 males/5 females)
Details on study design:
TEST SITE
- Area of exposure: Back and flanks
- % coverage: Approximately 10%
- Type of wrap if used: A piece of surgical gauze was placed over the treatment area and semi-occluded with a piece of self adhesive bandage.

REMOVAL OF TEST SUBSTANCE
- Washing (if done): The bandage was carefully removed and the treated skin and surrounding hair wiped with cotton wool moistened with distilled water to remove any residual test material.
- Time after start of exposure: 24 hours

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: The animals were observed for deaths or overt signs of toxicity 30 minutes, 1, 2 and 4 hours after dosing and subsequently once daily for fourteen days. Individual bodyweights were recorded prior to application of the test material on Day 0 and on Days 7 and 14 or at death.
- Other examinations performed: After removal of the dressings and subsequently once daily for fourteen days, the test sites were examined for evidence of primary irritation and scored according to the following scale from Draize J H (1977) "Dermal and Eye Toxicity Tests" In: Principles and Procedures for Evaluating the Toxicity of Household Substances, National Academy of Sciences, Washington DC p.31

EVALUATION OF SKIN REACTIONS
Erythema and Eschar Formation
No erythema : 0
Very slight erythema (barely perceptible): 1
Well-defined erythema: 2
Moderate to severe erythema: 3
Severe erythema (beef redness) to slight eschar formation (injuries in depth): 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 (raised approximately 1 millimetre): 3
Severe oedema (raised more than 1 millimetre and extending beyond the area of exposure): 4

Any other skin reactions, if present were also recorded.

Results and discussion

In vivo

Results
Remarks on result:
other: Adverse dermal reactions prevented accurate evaluation of erythema and oedema at all test sites during the test. The reactions were considered to be indicative of dermal corrosion.
Irritant / corrosive response data:
Signs of dermal irritation noted were very slight erythema, light brown discolouration of the epidermis, blanching of the skin, small superficial scattered scabs, hardened light brown coloured scab, hardened dark brown/black coloured scab, scab cracking, scab lifting at edges to reveal dried blood, scab lifting to reveal glossy skin, scab undulating and glossy skin. The scab/damaged tissue at the test site of one animal has sloughed off revealing a crater (ulcer) over the majority of the test site.
Other effects:
One female was killed for humane reasons seven days after dosing, due to the approach of the moderate severity limit set by the UK Home Office.
Signs of systemic toxicity noted in the female that was humanely killed were hunched posture, pilo-erection, dehydration, emaciation and pallor of the extremities. Tiptoe gait and/or hunched posture were noted in two other females. No signs of systemic toxicity were noted in the remaining females or all males.
Two females showed bodyweight loss during the first and second week. Three males and two females showed bodyweight loss during the first week but expected gain in bodyweight during the second week. Two males showed expected gains in bodyweight over the study period.
Gaseous distension of the stomach was noted in the animal that was killed for humane reasons during the study. No abnormalities were noted at necropsy of the animals killed at the end of the study.

Any other information on results incl. tables

Table1: Individual Dermal Reactions - Males

Dose Level mg/kg

Animal Number and Sex

Observation

Effects Noted After Initiation of Exposure (Days)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

2000

1-

Male

Erythema

0

1

1

?e

?e

?e

?e

?e

?e

?e

?e

?e

?e

?e

Oedema

0

0

0

?od

?od

?od

?od

?od

?od

?od

?od

?od

?od

?od

Other

0

SsBr

SsBr

Sp

SpSw

StSw

StSw

StSw

StSw

StSbSg

StSbSg

StSbSg

StSbSgSk

StSbSgSk

1-1

Male

Erythema

0

0

0

1

?e

?e

?e

?e

?e

?e

?e

?e

?e

?e

Oedema

0

0

0

0

?od

?od

?od

?od

?od

?od

?od

?od

?od

?od

Other

0

0

Ss

SsBr

Sp

Sp

St

St

St

StSw

StSw

StSwSgSk

StSwSgSk

StSbSgSkSw

1-2

Male

Erythema

1

1

1

?e

?e

?e

?e

?e

?e

?e

?e

?e

?e

?e

Oedema

0

0

0

?od

?od

?od

?od

?od

?od

?od

?od

?od

?od

?od

Other

0

SsBr

SsBr

Sp

Sp

StSw

StSw

StSw

StSw

StSw

StSw

StSwSg

StSwSgSk

StSwSgSkSb

1-3

Male

Erythema

1

1

1

?e

?e

?e

?e

?e

?e

?e

?e

?e

?e

?e

Oedema

0

0

0

?od

?od

?od

?od

?od

?od

?od

?od

?od

?od

?od

Other

0

SsBr

SsBr

Sp

Sp

StSw

StSw

StSwSb

StSwSb

StSgSb

StSbSg

StSwSb

StSwSbSg

SpSwSbSg

1-4

Male

Erythema

0

0

0

0

1

?e

?e

?e

?e

?e

?e

?e

?e

?e

Oedema

0

0

0

0

0

?od

?od

?od

?od

?od

?od

?od

?od

?od

Other

0

0

0

0

SsBr

Sp

St

StSw

StSw

StSw

StSw

StSwSgSs

StSwSgSk

StSwSgSkSb

0= No reactions                                                         Ss = Small superficial scattered scabs             Sp = Hardened light brown coloured scab

St = Hardened dark brown/black coloured scab             Sk = Scab cracking      G = Glossy skin                      Sb = Scab lifting at edges to reveal dried blood

Sg = Scab lifting to reveal glossy skin                         Sw = Scab undulating                                    Br = Light brown discolouration of the epidermis

?e = Adverse reactions prevent evaluation of erythema            ?od = Adverse reactions prevent evaluation of oedema


Table 2: Individual Dermal Reactions - Females

Dose Level mg/kg

Animal Number and Sex

Observation

Effects Noted After Initiation of Exposure (Days)

1

2

3

4

5

6

7

8

9

10

11

12

13

14

2000

2-0

Female

Erythema

0

1

1

1

1

?e

?e

-

-

-

-

-

-

-

Oedema

0

0

0

0

0

?od

?od

-

-

-

-

-

-

-

Other

0

SsBl

SsBl

SsBl

SsBlBr

BrBl

Sp

-

-

-

-

-

-

-

2-1

Female

Erythema

0

1

1

1

?e

?e

?e

?e

?e

?e

?e

?e

?e

?e

Oedema

0

0

0

0

?od

?od

?od

?od

?od

?od

?od

?od

?od

?od

Other

0

SsBl

SsBl

SsBl

Sp

Sp

St

StSwSg

StSwSgSb

StSwSgSb

StSwSgSb

StSwSgSb

StSkSgSb

SsSgSbU

2-2

Female

Erythema

1

1

1

1

?e

?e

?e

?e

?e

?e

?e

?e

?e

?e

Oedema

0

0

0

0

?od

?od

?od

?od

?od

?od

?od

?od

?od

?od

Other

Ss

SsBl

SsBlBr

SsBlBr

Sp

SpSw

StSkSw

StSgSw

StSgSw

StSg

StSg

GSt
Sg

GSt
Sg

GU

2-3

Female

Erythema

0

1

1

1

1

?e

?e

?e

?e

?e

?e

?e

?e

?e

Oedema

0

0

0

0

0

?od

?od

?od

?od

?od

?od

?od

?od

?od

Other

0

SsBl

SsBl

SsBl

SsBlBr

BrBl
Ss

StSw

StSw

StSw

StSw

StSw

StSw

StSwSg

StSwSbSc

2-4

Female

Erythema

0

1

1

1

1

?e

?e

?e

?e

?e

?e

?e

?e

?e

Oedema

0

0

0

0

0

?od

?od

?od

?od

?od

?od

?od

?od

?od

Other

0

SsBl

SsBl

SsBl

SsBlBr

BrBl
Ss

Sp

StSw

StSw

StSw


StSwSgSb

StSwSgSb

StSwSgSb

0= No reactions          Bl = Blanching of the skin         Ss = Small superficial scattered scabs              Sp = Hardened light brown coloured scab

St = Hardened dark brown/black coloured scab             Sk = Scab cracking      G = Glossy skin                      Sb = Scab lifting at edges to reveal dried blood

Sg = Scab lifting to reveal glossy skin                         Sw = Scab undulating              U = Scab/damaged tissue sloughed off revealing a crater (ulcer)

?e = Adverse reactions prevent evaluation of erythema ?od = Adverse reactions prevent evaluation of oedema            - = Animal dead

Applicant's summary and conclusion

Interpretation of results:
corrosive
Remarks:
Migrated information Criteria used for interpretation of results: EU
Conclusions:
Adverse dermal reactions prevented accurate evaluation of erythema and oedema at all test sites during the test. The reactions were considered to be indicative of dermal corrosion.