Registration Dossier

Toxicological information

Skin sensitisation

Currently viewing:

Administrative data

Endpoint:
skin sensitisation: in vivo (non-LLNA)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
28 Dec 1981 - 14 Jan 1982
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Guideline study. Restriction due to missing details in study report. Missing details did not affect ability to evaluate effect of test substance on skin sensitisation.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1982
Report date:
1982

Materials and methods

Test guideline
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 406 (Skin Sensitisation)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of study:
guinea pig maximisation test
Justification for non-LLNA method:
During preparation of the original submission, reporting of an existing guinea pig maximisation test was considered more appropriate than sacrifice of further vertebrate animals in the newly adopted Local Lymph Node Assay.

Test material

Constituent 1
Chemical structure
Reference substance name:
Zinc bis[O,O-bis(2-ethylhexyl)] bis(dithiophosphate)
EC Number:
224-235-5
EC Name:
Zinc bis[O,O-bis(2-ethylhexyl)] bis(dithiophosphate)
Cas Number:
4259-15-8
Molecular formula:
Too complex
IUPAC Name:
1-Hexanol, 2-ethyl-, O,O-diester with phosphorodithioic acid, zinc salt

In vivo test system

Test animals

Species:
guinea pig
Strain:
Dunkin-Hartley
Sex:
male
Details on test animals and environmental conditions:
TEST ANIMALS
- Source: no data.
- Age at study initiation: no data.
- Weight at study initiation: between 300 and 400 g.
- Housing: the animal were housed and maintained in compliance with the Animal Welfare Act 9 CFR part 3. Five guinea pigs per cage were housed in stainless steel with elevated wire mesh flooring.
- Diet (e.g. ad libitum): Charles River Guinea Pig Formula was provided ad libitum.
- Water (e.g. ad libitum): tap water was provided ad libitum.
- Acclimation period: no data.

ENVIRONMENTAL CONDITIONS
- Temperature: 70 ± 2 oF
- Humidity (%): 45 ± 5
- Air changes (per hr): no data
- Photoperiod (hrs dark / hrs light): 12 hour light/dark cycle.

IN-LIFE DATES: From: 28 December 1981 To: 14 January 1982

Study design: in vivo (non-LLNA)

Inductionopen allclose all
Route:
intradermal and epicutaneous
Vehicle:
other: white mineral oil
Concentration / amount:
5.0 % w/v
Challengeopen allclose all
Route:
epicutaneous, occlusive
Vehicle:
other: white mineral oil
Concentration / amount:
5.0 % w/v
No. of animals per dose:
20 animals / dose
Details on study design:
RANGE FINDING TESTS: Unknown
MAIN STUDY
A. INDUCTION EXPOSURE
- No. of exposures: 2
- Exposure period: 1 week following injection and 2 days (48hrs) after dermal application
- Test groups: 1 group of 20 male animals.
- Control group: Not included.
- Site: skin over the shoulders.
- Frequency of applications: For induction stage: intradermal injections were made once at 3 pairs of sites simultaneously, 7 days later followed by dermal application of test material. Then the animals were allowed to rest for 2 weeks.
- Duration: total of 3 week time period.

- Concentrations: 5% w/v

B. CHALLENGE EXPOSURE
- No. of exposures: 1
- Day(s) of challenge: 1
- Exposure period: 21 h
- Test groups: 1 group of 20 male animals.
- Control group: Not included.
- Site: skin over the shoulders.
- Concentrations: 5% w/v
- Evaluation (hr after challenge): 24 hr and 48 hr

Challenge controls:
Not included
Positive control substance(s):
not required

Results and discussion

Positive control results:
n/a

In vivo (non-LLNA)

Resultsopen allclose all
Reading:
1st reading
Hours after challenge:
24
Group:
test chemical
Dose level:
5% w/v
No. with + reactions:
0
Total no. in group:
20
Clinical observations:
none
Remarks on result:
other: Reading: 1st reading. . Hours after challenge: 24.0. Group: test group. Dose level: 5% w/v. No with. + reactions: 0.0. Total no. in groups: 20.0. Clinical observations: none.
Reading:
1st reading
Hours after challenge:
48
Group:
test chemical
Dose level:
5% w/v
No. with + reactions:
0
Total no. in group:
20
Clinical observations:
none
Remarks on result:
other: Reading: 1st reading. . Hours after challenge: 48.0. Group: test group. Dose level: 5% w/v. No with. + reactions: 0.0. Total no. in groups: 20.0. Clinical observations: none.

Applicant's summary and conclusion

Interpretation of results:
not sensitising
Remarks:
Migrated information
Conclusions:
The test material does not appear to be a sensitizer in the albino guinea pig.
Executive summary:

In a Magnusson-Kligman Guinea Pig maximization test, 20 Dunkin-Hartley strain albino Guinea Pigs were treated with 5.0% w/v test substance, Scores of zero in all test animals were obtained at all time points examined. The test material does not appear to be a sensitizer in the albino guinea pig.