2,2,2-trichloro-1-phenylethyl acetate

Skin sensitisation

Administrative data

Endpoint:

skin sensitisation: in vivo (non-LLNA)

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Justification for type of information:

Data is from experimental report

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1980

Report date:

1980

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

other: as mentioned below

Principles of method if other than guideline:

Skin sensitization study of test chemical was conducted in 10 guinea pigs to determine its sensitization potential by using Magnusson and Kligman guinea pig maximization test.

GLP compliance:

not specified

Type of study:

guinea pig maximisation test

Justification for non-LLNA method:

Not specified

Test material

Test material information

Constituent 1

Reference substance name:

2,2,2-trichloro-1-phenylethyl acetate

EC Number:

201-972-0

EC Name:

2,2,2-trichloro-1-phenylethyl acetate

Cas Number:

90-17-5

Molecular formula:

C10H9Cl3O2

IUPAC Name:

2,2,2-trichloro-1-phenylethyl acetate

Details on test material:

- Name of test material: 2, 2, 2-trichloro-1-phenylethyl acetate (Rosacetone)
- Molecular formula: C10H9Cl3O2
- Molecular weight: 267.54
- Substance type: Organic
- Physical state: Solid

In vivo test system

Test animals

Species:

guinea pig

Strain:

not specified

Sex:

male/female

Details on test animals and environmental conditions:

The weight of test animal are taken on friday of each week of the test.

Study design: in vivo (non-LLNA)

Induction

Induction 1

Route:

intradermal

Vehicle:

other: Acetone,PEG 400, Dobs/saline

Concentration / amount:

Test concentration:-
•Induction (intradermal injection) : 0.5%
•0.1ml intradermal injections are made within a 2x4cm area of the shoulder region in following
sequence:-
1) 2 injections of 50% F.C.A in the solvent system chosen for the test sample.
2) 2 injections of test material at the concentration and in the solvent system chosen in the preliminary irritation tests. These injections are given into the periphery of the "bleb" caused by injection1.
3) 2 injections of test material of the concentration chosen in the preliminary irritation tests in a 50/50 mixture of F.C.A and the chosen solvent system.

Day(s)/duration:

7 days

Adequacy of induction:

other: The concentration giving definite irritation (+/-) was selected for shoulder induction

Induction 2

Route:

epicutaneous, occlusive

Vehicle:

other: acetone

Concentration / amount:

40%

Day(s)/duration:

48

Adequacy of induction:

other: The concentration giving definite irritation (+/-) was selected for shoulder induction.

Challenge

Challenge 1

No.:

#1

Route:

epicutaneous, occlusive

Vehicle:

other: acetone

Concentration / amount:

10%

Day(s)/duration:

48 hours

Adequacy of challenge:

highest non-irritant concentration

Challenge 2

No.:

#2

Route:

epicutaneous, occlusive

Vehicle:

other: Acetone

Concentration / amount:

10%

Day(s)/duration:

48 hours

Adequacy of challenge:

highest non-irritant concentration

No. of animals per dose:

10 guinea pig / group

Details on study design:

RANGE FINDING TESTS: The preliminary irritation tests were performed in 4 guinea pigs to determine concentrations suitable for sensitization test [induction and challenge].As a result of the preliminary studies, the concentration chosen for skin sensitization test were 0.5% for the intradermal induction and 40% and 10% for the topical induction(neck), flank challenge respectively.

MAIN STUDY
A.I. INDUCTION EXPOSURE: Intradermal
- No. of exposures: 1
- Exposure period: 7 days
- Test groups:10 guinea pigs
- Control group: No Data Available
- Site: Shoulder region
- Frequency of applications:
- Duration: 7 days
- Concentrations: 0.5%

II. A. INDUCTION EXPOSURE: TOPICAL
- No. of exposures: 1
- Exposure period: 48 hours
- Test groups:10 guinea pigs
- Control group: No Data Available
- Site: Shoulder region
- Frequency of applications: 1
- Duration: 48 hours
- Concentrations: 40%

B. CHALLENGE EXPOSURE: Epicutaneous
- No. of exposures:1
- Day(s) of challenge: Fourteen days later, challenge test was performed
- Exposure period:24 hours
- Test groups:10guinea pigs
- Control group: :4 guinea pigs
- Site: onto the shaved flank i
- Concentrations: 10%
- Evaluation (hr after challenge): after 24 and 48 hours

C. RECHALLENGE EXPOSURE
- No. of exposures:1
- Day(s) of challenge: 1 week Later , rechalleange test was performed.
- Exposure period: No Data Available
- Test groups:10 animal
- Control group: 4 animal (same sex)
- Site: on opposite flanks
- Concentrations: 10%
- Evaluation (hr after challenge): 48 hours

Challenge controls:

yes , concurrent vehicles were used

Positive control substance(s):

not specified

Results and discussion

In vivo (non-LLNA)

Results

Results 1

Reading:

1st reading

Hours after challenge:

48

Group:

test chemical

Dose level:

10%

No. with + reactions:

0

Total no. in group:

10

Clinical observations:

No skin sensitizing reactions were observed.

Remarks on result:

no indication of skin sensitisation

Results 2

Reading:

rechallenge

Hours after challenge:

48

Group:

test chemical

Dose level:

10%

No. with + reactions:

0

Total no. in group:

10

Clinical observations:

None of the guinea pigs had showed positive results when re-challenged at concentration of 10% in acetone

Remarks on result:

no indication of skin sensitisation

Any other information on results incl. tables

Table 3: Results of challenge 1

Guinea pigs				10%
No.	Ear no.	Sex	Wt. (g)	24hr	48hr	24hr	48hr	24hr	48hr
1	12574	M	506	0	0
2	12622	M	470	0	0
3	12538	M	451	0	0
4	1254	M	507	±	0
5	12587	M	468	0	0
6	12573	M	504	0	0
7	12607	F	449	0	0
8	12645	F	408	0	0
9	w 12	F	450	±	±
10	12124	F	413	0	0
No. of positive reactions				0	0

0=no reaction

+=barely perceptible erythema

±=Scattered, mild erythema (faint pink)

++=moderate and diffuse erythema (pale pink)

+++=intense erythema (deep pink) and odema

 

II) Untreated controls

1	12252	F	420	0	0
2	0859	F	444	0	0
3	12432	F	502	0	0
4	-393	F	406	0	0
5
6
7
8
9
10

 

 

Table 4: Results of challenge 2

Guinea pigs				10%
No.	Ear no.	Sex	Wt. (g)	24hr	48hr	24hr	48hr	24hr	48hr
1	12574	M	524	0	0
2	12622	M	576	0	0
3	12538	M	486	0	0
4	1254	M	51*	0	0
5	12587	M	566	0	0
6	12573	M	530	0	0
7	12607	F	456	0	±
8	12645	F	518	0	0
9	w 12	F	496	0	0
10	12124	F	460	±	0

 

II) Untreated controls

1	21872	F	394	0	0
2	12755	F	408	±	±
3	12818	F	432	0	0
4	21873	F	404	0	±
5
6
7
8
9
10
No. of positive reactions				0	0

Applicant's summary and conclusion

Interpretation of results:

other: not sensitising

Conclusions:

None of the guinea pigs had showed positive results when re-challenged at concentration of 10% in acetone. Thus, it can be concluded that thetest chemicalwas considered to be not sensitizing on skin ofguinea pigs.

Executive summary:

Skin sensitization study of test chemical was conducted in 10 guinea pigs to determine its sensitization potential by using Magnusson and Kligman guinea pig maximization test.

The preliminary irritation tests were performed in 4 guinea pigs to determine concentrations suitable for sensitization study[induction and challenge].As a result of the preliminary studies, the concentrationchosen forskin sensitization test were0.5% for the intradermal induction and 40% and 10% for the topical induction(neck), flank challenge respectively.

During the sensitization test, 10 untreated guinea pigs were given, six 0.1ml intradermal injections are made within a 2x4cm area of the shoulder. 7 Days later sensitization was boosted by placing over the shoulder injection site a 2x4cm filter paper patch saturated with 40% in acetone. The patch test occluded with thin polythene, held in place by poroplast, and was left in place for 48 hours.

14 days after application of the shoulder patch, challenge exposure was carried out on one flank of the guinea pigs by an occlusive patch. The cup was applied to shaved flank and held in place by Poroplast wound around the trunk. 24 hours later the patch was removed, the reaction being scored at 24, 48 hours subsequently. One week later, the challenge exposure was repeated on the other flank

None of the guinea pigs had showed positive results when re-challenged at concentration of 10% in acetone. Thus, it can be concluded that thetest chemicalwas considered to be not sensitizing on skin of guinea pigs.