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Toxicological information

Skin sensitisation

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Administrative data

Endpoint:
skin sensitisation: in vivo (non-LLNA)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1979-09-21 to 1979-10-27
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: This study is classified as reliable with restrictions because it was conducted similar to guideline study OECD 406.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1980
Report date:
1980

Materials and methods

Test guideline
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 406 (Skin Sensitisation)
GLP compliance:
not specified
Type of study:
not specified

Test material

Constituent 1
Reference substance name:
#2 home heating oil (50% catalytically-cracked)
IUPAC Name:
#2 home heating oil (50% catalytically-cracked)
Details on test material:
- Name of test material (as cited in study report): API #78-4, #2 home heating oil (50% cat)
- Substance type: petroleum distillation product composed of hydrocarbon chains
- Physical state: liquid
- Analytical purity: not provided by sponsor
- Impurities (identity and concentrations): not reported
- Composition of test material, percentage of components: 50% virgina gas oil and 50% cracked gas oil
- Isomers composition: not reported
- Purity test date: not reported
- Lot/batch No.: not reported
- Expiration date of the lot/batch: not reported
- Stability under test conditions: not provided by sponsor
- Storage condition of test material: 30 mL was removed from Elars' test material storage room and placed in an amber vial in the study room for the duration of the test.

In vivo test system

Test animals

Species:
guinea pig
Strain:
other: albino
Sex:
male
Details on test animals and environmental conditions:
TEST ANIMALS
- Source: CAMM Research Institute
- Age at study initiation: young adult
- Weight at study initiation: not reported
- Housing: housed in stainless steel
- Diet (e.g. ad libitum): ad libitum
- Water (e.g. ad libitum): ad libitum
- Acclimation period: 11 days


ENVIRONMENTAL CONDITIONS
- Temperature (°C): not reported
- Humidity (%): not reported
- Air changes (per hr): not reported
- Photoperiod (hrs dark / hrs light): not reported


IN-LIFE DATES: not reported

Study design: in vivo (non-LLNA)

Inductionopen allclose all
Route:
epicutaneous, occlusive
Vehicle:
no data
Concentration / amount:
0.5 mL of undiluted test material
Challengeopen allclose all
Route:
epicutaneous, occlusive
Vehicle:
no data
Concentration / amount:
0.5 mL of undiluted test material
No. of animals per dose:
10 animals per dose
Details on study design:
RANGE FINDING TESTS: not reported

MAIN STUDY
A. INDUCTION EXPOSURE
- No. of exposures: 10 exposures
- Exposure period: 6 hours
- Test groups: 1 group of 10 animals
- Control group: 1 group of 10 animals
- Site: back of guinea pigs
- Frequency of applications: 3 times per week
- Duration: 3 weeks
- Concentrations: 0.5 mL of undiluted test material


B. CHALLENGE EXPOSURE
- No. of exposures: 1
- Day(s) of challenge: 2 weeks after last induction exposure
- Exposure period: 6 hours
- Test groups: 1 group of 10 animals
- Control group: 1 group of 10 animals
- Site: backs of guinea pigs
- Concentrations: 0.5 mL of undiluted test material
- Evaluation (hr after challenge): 24 hours


Positive control substance(s):
yes
Remarks:
chlorodinitrobenzene in ethanol

Results and discussion

Positive control results:
No statistically significant differences between the mean of the averages of the ten sensitizing treatments and the mean of the challenge treatment for either erythema or oedema in the control group.

In vivo (non-LLNA)

Resultsopen allclose all
Reading:
1st reading
Hours after challenge:
24
Group:
test chemical
Dose level:
undiluted
No. with + reactions:
10
Total no. in group:
10
Clinical observations:
1.1 average erythema score and 0.5 average oedema score
Remarks on result:
other: Reading: 1st reading. . Hours after challenge: 24.0. Group: test group. Dose level: undiluted. No with. + reactions: 10.0. Total no. in groups: 10.0. Clinical observations: 1.1 average erythema score and 0.5 average oedema score.
Reading:
1st reading
Hours after challenge:
24
Group:
positive control
Dose level:
0.05% w/v dilution of chlorodinitrobenzene
No. with + reactions:
10
Total no. in group:
10
Clinical observations:
mean erythema = 1.9
Remarks on result:
other: Reading: 1st reading. . Hours after challenge: 24.0. Group: positive control. Dose level: 0.05% w/v dilution of chlorodinitrobenzene. No with. + reactions: 10.0. Total no. in groups: 10.0. Clinical observations: mean erythema = 1.9.

Any other information on results incl. tables

Phase

Average Dermal Irritation Score

API #78-4

Positive Control

Erythema

Oedema

Erythema

Oedema

Induction Phase Average

1.0

0.3

1.3

0.3

Challenge Phase Average

1.1

0.5

1.9

0.7

Applicant's summary and conclusion

Interpretation of results:
not sensitising
Remarks:
Migrated information
Conclusions:
In a skin sensitisation study, there were no statistically significant differences between the mean of the averages of the ten sensitising treatments and the mean of the challenge treatment for wither erythema or oedema in the test or control group. Based on these results, the test material is considered non-sensitising.
Executive summary:

In a skin sensitisation study, ten young adult male albino rabbits were exposed to 0.5 mL of undiluted test material in the treatment group and ten

ten young adult male albino rabbits were exposed to 0.05% (w/v) dilution of chlorodinitrobenzene in ethanol in the positive control group. Both groups were shaved in an area on their backs approximately 3" x 3" in size. On the day of application, test material or positive control was placed on a gauze patch which was put on the shaved exposure site, covered with plastic wrap and wrapped with elastic bandaging. Bandaging and wrapping was removed 6 hours after application. The same procedure was replicated 3 times a week for 3 weeks (10 treatments in total). Two weeks after the last induction dose, a single challenge dose was administered following the same methods as used during the induction period, in both the treatment and positive control groups. Scoring of erythema and oedema was made at 24 hours after each application.

Results indicated no statistically significant differences between the mean of the averages of the ten sensitising treatments and the mean of the challenge treatment for wither erythema or oedema in the test or control group. Based on this data, the test material is considered non-sensitising.

This study received a Klimisch score of 2 and is classified as reliable with restriction because it was conducted similar to guideline study OECD 406.

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