Essential oil of Cedarwood Texas obtained from the wood of Juniperus mexicana (Cupressaceae) by distillation - Cedrol

Endpoint summary

Description of key information

Skin sensitisation (OECD TG 429): sensitising

Key value for chemical safety assessment

Skin sensitisation

Endpoint conclusion

Endpoint conclusion:

adverse effect observed (sensitising)

Additional information:

The skin sensitisation potential of Cedrol, Cedarwood Texas oil distilled was tested according to OECD, Section 4, Health Effects, No.429 (2010). Three experimental groups of five female CBA/J mice were treated with test item concentrations of 5, 10 or 25% w/w on three consecutive days, by open application on the ears. Test item concentrations selected for the main study were based on the results of a pre-screen test. Five vehicle control animals were similarly treated, but with the vehicle alone (AcOO).  No erythema was noted for any of the animals, Scaliness was noted on the ears of four animals treated at 25% between days 3 and 6. No mortality occurred and no clinical signs of systemic toxicity were observed in the animals of the main study. All auricular lymph nodes of the animals of the experimental and control groups were considered normal in size. No macroscopic abnormalities of the surrounding area were noted for any of the animals. Body weights and body weight gain of experimental animals remained in the same range as controls over the main study period. Mean DPM/animal values for the experimental groups treated with test item concentrations 5, 10 and 25% were 561, 647 and 1524 DPM, respectively. The mean DPM/animal value for the vehicle control group was 285 DPM. The SI values calculated for the test item concentrations 5, 10 and 25% were 2.0, 2.3 and 5.4, respectively. The data showed a dose-response and an EC3 value (the estimated test item concentration that will give a SI =3) of 13.4% was calculated. Based on the results of this LLNA, Cedrol, Cedarwood Texas oil distilled needs to be classified as Skin Sensitiser Category 1B according to the classifcation critria outlined in Annex I of 1272/2008/EC (CLP).

Justification for classification or non-classification

Based on the results of this LLNA, the calculated EC3 value is 13.4%. Therefore, Cedrol, Cedarwood Texas oil distilled needs to be classified as category 1B skin sensitiser according to the classification criteria outlined in Annex I of 1272/2008/EC (CLP).