2,6-xylenol

Skin sensitisation

Administrative data

Endpoint:

skin sensitisation

Remarks:

in vivo

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Study was conducted using a modified Landsteiner technique. A positive control substance was included in this study. There were 6 animals in the positive control group and 9 animals in the test group.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1965

Report date:

1965

Materials and methods

Test guideline

Qualifier:

no guideline followed

Principles of method if other than guideline:

A modified Landsteiner technique (Landsteiner, K., and Jacob, J., Exptl. Med. 61, 643, 1935; Draize, J.H., Woodard, G., and Calvery, H.O., J. Pharmacol. Exptl. Therap. 82, 337, 1944) was used to evaluate the possibility of skin sensitization from the test substance.

GLP compliance:

no

Type of study:

other: modified Landsteiner technique

Test material

Test material information

Constituent 1

Reference substance name:

2,6 xylenol

IUPAC Name:

2,6 xylenol

Constituent 2

Reference substance name:

2,6-xylenol

EC Number:

209-400-1

EC Name:

2,6-xylenol

Cas Number:

576-26-1

Molecular formula:

C8H10O

IUPAC Name:

2,6-dimethylphenol

Details on test material:

- Name of test material (as cited in study report): 2,6-xylenol
- Physical state: white solid
- Analytical purity: The material was considered to be free of impurities.
- Other: received on February 25, 1965. The test substance has a strong pungent odor.

In vivo test system

Test animals

Species:

guinea pig

Strain:

other: albino

Sex:

male

Details on test animals and environmental conditions:

TEST ANIMALS
- Weight at study initiation: 310 to 709 grams
- Housing: The animals were housed by groups in metal cages.
- Diet: Purina Rabbit Chow were available at all times and fresh lettuce was supplied once daily
- Water: Water was available at all time.

Study design: in vivo (non-LLNA)

Induction

Induction 1

Route:

epicutaneous, open

Vehicle:

other: ethyl alcohol

Induction 2

Concentration / amount:

0.1% weight/volume in vehicle (70% ethyl alcohol).

Challenge

Challenge 1

Route:

epicutaneous, open

Vehicle:

other: ethyl alcohol

Challenge 2

Concentration / amount:

0.1% weight/volume in vehicle (70% ethyl alcohol).

No. of animals per dose:

The positive control group consisted of 6 animals, and the test group consisted of 9 animals.

Challenge controls:

A challenge of freshly prepared control was administered in the same manner as the sensitizing doses.

Positive control substance(s):

yes

Remarks:

1-chloro-2,4-dinitrobenzene(DNCB)

Results and discussion

Positive control results:

The first or three sensitizing doses of 1-chloro-2,4-dinitrobenzene produced no signs of irritation, while the remaining seven or eight doses generally elicited moderate erythema; slight edema was noted following four to seven of the doses and blanching at the center of the site was noted following three to eight of the doses.
The challenge dose of the positive control material produced a skin response either slightly more intense or essentially the same as that produced by the latter sensitizing doses. In two of the animals the diameter of the area involved was considerably greater than the average of the sensitizing doses, and in two additional animals the intensity and area were both greater, indicating possible sensitization in four of the six animals.

In vivo (non-LLNA)

Results

Results 1

Reading:

1st reading

Hours after challenge:

24

Group:

test chemical

Dose level:

0.1% weight/volume in vehicle

No. with + reactions:

0

Total no. in group:

9

Clinical observations:

All animals seemed normal in appearance and behavior and gained weight.

Remarks on result:

other: see Remark

Remarks:

Reading: 1st reading. . Hours after challenge: 24.0. Group: test group. Dose level: 0.1% weight/volume in vehicle. No with. + reactions: 0.0. Total no. in groups: 9.0. Clinical observations: All animals seemed normal in appearance and behavior and gained weight..

Results 2

Reading:

2nd reading

Hours after challenge:

48

Group:

test chemical

Dose level:

0.1% weight/volume in vehicle

No. with + reactions:

0

Total no. in group:

9

Clinical observations:

All animals seemed normal in appearance and behavior and gained weight.

Remarks on result:

other: see Remark

Remarks:

Reading: 2nd reading. . Hours after challenge: 48.0. Group: test group. Dose level: 0.1% weight/volume in vehicle. No with. + reactions: 0.0. Total no. in groups: 9.0. Clinical observations: All animals seemed normal in appearance and behavior and gained weight..

Results 3

Reading:

1st reading

Hours after challenge:

24

Group:

positive control

Dose level:

0.5% weight/volume in vehicle

No. with + reactions:

4

Total no. in group:

6

Remarks on result:

other: Reading: 1st reading. . Hours after challenge: 24.0. Group: positive control. Dose level: 0.5% weight/volume in vehicle. No with. + reactions: 4.0. Total no. in groups: 6.0.

Any other information on results incl. tables

All animals seemed normal in appearance and behavior and gained weight.

No signs of irritation were noted following any of the sensitizing doses in two of the test animals. In the remaining animals of the test group, slight erythema was noted following one to four of the sensitizing doses. No response was noted in the test animals after the challenge, indicating absence of sensitization.

Applicant's summary and conclusion

Interpretation of results:

not sensitising

Remarks:

Migrated information

Conclusions:

The test substance did not produce sensitization in guinea pigs by modified Landsteiner technique based on the results of this study. A known sensitizer, 1-chloro-2,4-dinitrobenzene produced apparent sensitization in four of the six guinea pigs in this study.