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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:
1996-12-09 to 1997-01-10
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1997
Report date:
1997

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
EU Method B.6 (Skin Sensitisation)
Version / remarks:
EC 92/69
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 406 (Skin Sensitisation)
Deviations:
no
GLP compliance:
yes
Type of study:
guinea pig maximisation test
Justification for non-LLNA method:
The study was conducted in 1997. By this time the LLNA was not established yet.

Test material

Constituent 1
Chemical structure
Reference substance name:
-
EC Number:
416-600-4
EC Name:
-
Cas Number:
77703-56-1
Molecular formula:
C23H32N4O2
IUPAC Name:
3-butyl-1-[4-({4-[(butylcarbamoyl)amino]phenyl}methyl)phenyl]urea
Specific details on test material used for the study:
Analytical purity: treated as 100 % pure
Lot/batch No.: V96/16

In vivo test system

Test animals

Species:
guinea pig
Strain:
Himalayan
Sex:
female
Details on test animals and environmental conditions:
TEST ANIMALS
- Source: BRL Ltd., Basel, Switzerland;
- Age at study initiation: approx. 6 weeks;
- Weight at study initiation: max. 500 g,
- Housing: groups of 5 in metal wire cages with wire-mesh floors;
- Diet: standard guinea pig diet ad libitum; Suppl.: Hope Farms, Woerden, The Netherlands;
- Water: tap-water, diluted with decalcified water, ad libitum;
- Acclimation period: at least 5 days;


ENVIRONMENTAL CONDITIONS
- Temperature: 21°C;
- Humidity: 50 % R.H.
- Air changes: approx. 15 air changes per hour;
- Photoperiod: 12 hours artificial fluorescent light/12 hours dark;


Study design: in vivo (non-LLNA)

Induction
Route:
intradermal and epicutaneous
Vehicle:
CMC (carboxymethyl cellulose)
Concentration / amount:
Induction: 0.2 % test substance concentration
Challenge
Route:
epicutaneous, occlusive
Vehicle:
CMC (carboxymethyl cellulose)
Concentration / amount:
Challenge: 50 % test substance concentration;
No. of animals per dose:
Experimental group: 10 females,
Control group: 5 females;
Details on study design:
Test substance concentrations (in 1 % aqueous carboxymethyl cellulose) selected for the main study were based on the results of a preliminary study. In the main study, ten experimental animals were intradermally injected with a 0.2 % concentration and epidermally exposed to a 50 % concentration. Five control animals were similarly treated, but with vehicle only. Approximately 24 hours before the epidermal induction exposure all animals were treated with 10 % SDS. Two weeks after the epidermal application all animals were challenged with a 50 % test substance concentration and the vehicle.
Positive control substance(s):
not specified

Results and discussion

Positive control results:
None

In vivo (non-LLNA)

Resultsopen allclose all
Key result
Reading:
1st reading
Hours after challenge:
24
Group:
test chemical
Dose level:
50 %
No. with + reactions:
0
Total no. in group:
10
Clinical observations:
none
Key result
Reading:
2nd reading
Hours after challenge:
48
Group:
test chemical
Dose level:
50 %
No. with + reactions:
0
Total no. in group:
10
Clinical observations:
none
Key result
Reading:
1st reading
Hours after challenge:
24
Group:
negative control
Dose level:
0 %
No. with + reactions:
0
Total no. in group:
5
Clinical observations:
none
Key result
Reading:
2nd reading
Hours after challenge:
48
Group:
negative control
Dose level:
0 %
No. with + reactions:
0
Total no. in group:
5
Clinical observations:
none
Key result
Group:
positive control
Remarks on result:
not measured/tested

Any other information on results incl. tables

Based on the results of a preliminary study, the test substance concentrations selected for the main study were a 0.2 % concentration for the intradermal induction and a 50 % concentration for the epidermal induction exposure.

Since no signs of irritation were observed at the concentrations selected for the epidermal induction, all animals were treated with 10 % SDS (Sodium Dodecyl Sulfate) approximately 24 hours before the epidermal induction. A 50 % test substance concentration was selected for the challenge phase.

Induction phase:

The skin effects caused by the intradermal injections and epidermal exposure during the induction phase are given in the table. The reactions noted in two experimental animals after the epidermal induction exposure were considered to be enhanced by the SDS treatment.

Induction

 

Animal Number

Intradermal Injection

(DAY 3)

Epidermal Exposure

(DAY 10)

50%#

A

B

C

Control

Erythema

Oedema

72

E1

NA

E1

0

0

73

E1

NA

E1

0

0

74

E1

NA

E1

0

0

75

E1

NA

E1

0

0

76

E1

NA

E1

0

0

Experimental

 

 

77

E1

NA

E1

0

0

78

E1

NA

E1

0

0

79

E1

NA

E1

0

0

80

E2

NA

E2

 0a

0

81

E1

NA

E1

0

0

82

E2

NA

E1

 0a

0

83

N3

NA

E1

0

0

84

E1

NA

E1

0

0

85

E1

NA

E1

0

0

86

E1

NA

E1

0

0

 

A. 1 : 1 mixture of FCA and water for injection.

B. A 0..2% test substance concentration (Experimental); vehicle (Control).

C. 1 : 1 mixture of FCA and a 0.4% concentration (Experimental) or vehicle (Control).

#. Test Substance concentration.

a. Small scabs

 

Skin effects intradermal injections:

NA No abnormalities

E( . ) Erythema (grade)

N ( . ) Signs of necrosis (mm in diameter)

 


Challenge phase:

No skin reactions were evident after the challenge exposure in the experimental and control animals (see table).

Challenge

 

CHALLENGE

Animal No.

DAY 24

DAY 25

COMMENTS

50%#

Vehicle

50%

Vehicle

Control

72

0

0

0

0

0

73

0

0

0

0

0

74

0

0

0

0

0

75

0

0

0

0

0

76

0

0

0

0

0

Experimental

 

 

77

0

0

0

0

not sensitised

78

0

0

0

0

not sensitised

79

0

0

0

0

not sensitised

80

0

0

0

0

not sensitised

81

0

0

0

0

not sensitised

82

0

0

0

0

not sensitised

83

0

0

0

0

not sensitised

84

0

0

0

0

not sensitised

85

0

0

0

0

not sensitised

86

0

0

0

0

not sensitised

 

# . Test substance concentration.

Applicant's summary and conclusion

Interpretation of results:
GHS criteria not met
Conclusions:
HAT S2 was tested for skin sensitization properties in the albino guinea pig maximization test. No skin reactions were evident after the challenge exposure in the experimental and control animals. This result indicates a sensitisation rate of 0 %. No classification and labelling for skin sensitization is necessary according to Regulation 1272/2008/EC (CLP).
Executive summary:

HAT S2 was tested for skin sensitization properties in the albino guinea pig maximization test.

No skin reactions were evident after the challenge exposure in the experimental and control animals. No evidence was obtained that HAT S2 had caused skin hypersensitivity in the guinea pig, since no responses were observed in the experimental animals in the challenge phase. This result indicates a sensitisation rate of 0 %. Therefore, HAT S2 can be regarded as not sensitizing