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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:
1993
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline 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 406 (Skin Sensitisation)
Deviations:
not specified
GLP compliance:
yes (incl. QA statement)
Type of study:
guinea pig maximisation test
Justification for non-LLNA method:
Study was conducted prior to REACH regulations.

Test material

Constituent 1
Chemical structure
Reference substance name:
Didodecyl nonylphenyl phosphite
EC Number:
252-457-2
EC Name:
Didodecyl nonylphenyl phosphite
Cas Number:
35239-35-1
Molecular formula:
C39-H73-O3-P
IUPAC Name:
Phosphorous acid, didodecyl nonylphenyl ester
Constituent 2
Chemical structure
Reference substance name:
Dodecyl bis(4-nonylphenyl) phosphite
EC Number:
284-117-4
EC Name:
Dodecyl bis(4-nonylphenyl) phosphite
Cas Number:
84787-76-8
Molecular formula:
C42-H71-O3-P
IUPAC Name:
Phosphorous acid, dodecyl bis(4-nonylphenyl) ester
Constituent 3
Chemical structure
Reference substance name:
4-nonylphenyl ditridecyl phosphite
EC Number:
284-119-5
EC Name:
4-nonylphenyl ditridecyl phosphite
Cas Number:
84787-77-9
Molecular formula:
C41-H77-O3-P
IUPAC Name:
Phosphorous acid, 4-nonylphenyl ditridecyl ester
Constituent 4
Chemical structure
Reference substance name:
Bis(4-nonylphenyl) tridecyl phosphite
EC Number:
284-120-0
EC Name:
Bis(4-nonylphenyl) tridecyl phosphite
Cas Number:
84787-78-0
Molecular formula:
C43-H73-O3-P
IUPAC Name:
Phosphorous acid, bis(4-nonylphenyl) tridecyl ester
impurity 1
Reference substance name:
Tris(nonylphenyl) phosphite
EC Number:
247-759-6
EC Name:
Tris(nonylphenyl) phosphite
Cas Number:
26523-78-4
IUPAC Name:
tris(2-nonylphenyl) phosphite
impurity 2
Reference substance name:
Didodecyl phosphonate
EC Number:
244-325-8
EC Name:
Didodecyl phosphonate
Cas Number:
21302-09-0
Molecular formula:
C24H51O3P
IUPAC Name:
Di(n-dodecyl)hydrogen phosphate
impurity 3
Chemical structure
Reference substance name:
Phenol, 4-nonyl-, branched
EC Number:
284-325-5
EC Name:
Phenol, 4-nonyl-, branched
Cas Number:
84852-15-3
Molecular formula:
C15H24O
IUPAC Name:
4-Nonylphenol, branched
Test material form:
liquid
Specific details on test material used for the study:
TEST MATERIAL NAME (as stated in study report): TK 12437 (Irgastab CH 302)

SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: Sponsor; Batch No. 08520495
- Expiration date of the lot/batch: July, 1996
- Purity: within the product specifications

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: room temperature

In vivo test system

Test animals

Species:
guinea pig
Strain:
other: Pirbright White Strain (Tif: DHP)
Sex:
male/female
Details on test animals and environmental conditions:
TEST ANIMALS
- Source: in house
- Weight at study initiation: 320 to 398 g
- Housing: individually in Macrolon cages (Type 3)
- Diet (e.g. ad libitum): Standard guinea pig pellets - NAFAG No. 845, Gossau SG; ad libitum
- Water (e.g. ad libitum): ad libitum

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22 +/- 3°C
- Humidity (%): 30 to 70%
- Photoperiod (hrs dark / hrs light): 12 / 12

Study design: in vivo (non-LLNA)

Inductionopen allclose all
Route:
intradermal
Vehicle:
other: Oleum arachidis
Concentration / amount:
5% / 0.1 mL
Day(s)/duration:
Single injection during Week 1
Adequacy of induction:
other: Concentration selected based on solubility of the test article and its local and systemic tolerability in a pretest.
Route:
epicutaneous, occlusive
Vehicle:
other: vaseline
Concentration / amount:
50% / 0.4 g
Day(s)/duration:
Single application during Week 2. Applied for 48 hours
Adequacy of induction:
other: Concentration selected based on primary Irritation potential
Challenge
No.:
#1
Route:
epicutaneous, occlusive
Vehicle:
other: vaseline
Concentration / amount:
10% / 0.2 g
Day(s)/duration:
Single application during Week 5. Applied for 24 hours
No. of animals per dose:
Test group: 10 males and 10 females
Control group; 5 males and 5 females
Details on study design:
see above
Challenge controls:
A control group of 10 animals (5 m/5 f) was treated with adjuvant and the vehicle during the induction period. During the challenge period the group was treated with the vehicle as well as with the test article to check the maximum subirritant concentration of the test article in adjuvant treated animals.
Positive control substance(s):
no
Remarks:
The sensitivity of the strain is checked once or twice a year with a known mild to moderate sensitiser, such as mercaptobenzothiazole, hexyl cinnamic aldehyde or potassiumdichromate.

Results and discussion

In vivo (non-LLNA)

Resultsopen allclose all
Reading:
1st reading
Hours after challenge:
24
Group:
test chemical
Dose level:
10%
No. with + reactions:
17
Total no. in group:
20
Reading:
2nd reading
Hours after challenge:
48
Group:
test chemical
Dose level:
10%
No. with + reactions:
16
Total no. in group:
20
Reading:
1st reading
Hours after challenge:
24
Group:
negative control
Dose level:
0%
No. with + reactions:
0
Total no. in group:
10
Reading:
2nd reading
Hours after challenge:
48
Group:
negative control
Dose level:
0%
No. with + reactions:
0
Total no. in group:
10

Any other information on results incl. tables

see attached summary table

Applicant's summary and conclusion

Interpretation of results:
Category 1B (indication of skin sensitising potential) based on GHS criteria
Conclusions:
In a guideline (OECD 406) in vivo GMPT study, Irgastab CH 302 was a skin sensitizer in albino guinea pigs. 85% of the test animals were sensitized at an induction concentration of 5%.