Dioctadecyl disulphide

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

6 Apr - 9 Apr 1993

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Guideline conform GLP study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1993

Report date:

1993

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

Deviations:

no

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Dioctadecyl disulphide

EC Number:

219-702-5

EC Name:

Dioctadecyl disulphide

Cas Number:

2500-88-1

Molecular formula:

C36H74S2

IUPAC Name:

dioctadecyl disulphide

Constituent 2

Reference substance name:

Di-n-octadecyl disulphide

IUPAC Name:

Di-n-octadecyl disulphide

Constituent 3

Reference substance name:

Hostanox SE 10

IUPAC Name:

Hostanox SE 10

Test animals

Species:

rabbit

Strain:

New Zealand White

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Chemisch pharmazeutische Fabrik, Dr. Karl Thomae GmbH, Biberach, Germany
- Age at study initiation: 3-5 months
- Weight at study initiation: 2.8-3.0 kg
- Housing: in fully air-conditioned rooms, separate cages (arranged in a battery)
- Diet (e.g. ad libitum): Altromin 2123 maintenance diet - rabbits (Altromin GmbH, Lage/Lippe), ad libitum and hay (approx. 15 g daily)
- Water (e.g. ad libitum): deionised, chlorinated water from automatic water dispenser, ad libitum

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 18+/-3°C
- Humidity (%): 55+/-20%
- Photoperiod (hrs dark / hrs light): 12/12

IN-LIFE DATES: From: 06.04.1993 To: 09.04.1993

Test system

Type of coverage:

semiocclusive

Preparation of test site:

shaved

Vehicle:

other: PEG 400

Controls:

not required

Amount / concentration applied:

500 mg

Duration of treatment / exposure:

4 h
Then test substance was removed from the skin with warm tap water.

Observation period:

30 - 60 min. after removal of the patches
24, 48 and 72 hrs after removal of the patches

Number of animals:

3

Details on study design:

TEST SITE
- Area of exposure: 2.5 x 2.5 cm
- % coverage: 100%
The moistened substance was applied over the whole surface of a 2.5 x 2.5 cm cellulose patch on a piece of surgical plaster (specially produced by Beiersdorf AG, Hamburg). The plaster was fixed to the prepared skinarea (ca. 25 cm2) and then covered with a semi-occlusive bandage

REMOVAL OF TEST SUBSTANCE
- Washing (if done): yes, with warm tap water
- Time after start of exposure: 4 h

SCORING SYSTEM:

Erythema and eschar formation
No erythema.......................................................................................................................0
very slight erythema (barely perceptible)......................................................................1
well-defined erythema......................................................................................................2
moderate to severe erythema..........................................................................................3
severe erythema (beet redness) to slight eschar formation (lesion in depth).........4

Oedema
No oedema...................................................................................................................................0
very slight oedema (barely perceptible)..................................................................................1
slight oedema (edges of area well defined by definite raising)............................................2
moderate oedema (raised approximately 1mm)....................................................................3
severe oedema (raised more than 1mm and extending beyond area of exposure.........4

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

erythema score

Basis:

mean

Time point:

24/48/72 h

Score:

0

Max. score:

4

Results 2

Irritation parameter:

edema score

Basis:

mean

Time point:

24/48/72 h

Score:

0

Max. score:

4

Irritant / corrosive response data:

No erthema/edema recorded

Other effects:

No

Applicant's summary and conclusion

Interpretation of results:

not irritating

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

No edema or erythema were recorded after 4 h exposure of 500 mg Hostanox SE 10 to rabbit skin. Therefore, the test substance is considered to be not irritating.

Executive summary:

Skin irritation was tested in a guideline study according to OECD guideline 404 in rabbits. 24 hours up to three days after treatment, the skin did not show any sign of erythema or edema. Mean scores on all observation time points after application were 0 for the three animals.