1-(5,6,7,8-tetrahydro-3,5,5,6,8,8-hexamethyl-2-naphthyl)ethan-1-one

Additional toxicological data

Administrative data

Endpoint:

additional toxicological information

Type of information:

experimental study

Adequacy of study:

key study

Study period:

12-16 January 1987

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: No GLP study. There is no standardized protocol for conducting photoirritancy screening in humans. The laboratory used its own protocol.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1987

Report date:

1987

Materials and methods

Type of study / information:

Photo irritancy

Principles of method if other than guideline:

The photoirritancy was tested on 10 human volunteers. AHTN was applied to several sites on the skin. Part of the sites were irradiated and the other sites non-irradiated. The skin evaluated at different time intervals. A positive control was also employed.

GLP compliance:

no

Test material

Test material information

Constituent 1

Reference substance name:

1-(5,6,7,8-tetrahydro-3,5,5,6,8,8-hexamethyl-2-naphthyl)ethan-1-one

EC Number:

216-133-4

EC Name:

1-(5,6,7,8-tetrahydro-3,5,5,6,8,8-hexamethyl-2-naphthyl)ethan-1-one

Cas Number:

1506-02-1

Molecular formula:

C18H26O

IUPAC Name:

1-(5,6,7,8-tetrahydro-3,5,5,6,8,8-hexamethyl-2-naphthyl)ethan-1-one

Details on test material:

Tonalid

Results and discussion

Any other information on results incl. tables

 There were no significant reactions to the AHTN solution but all three subjects exposed to 8-MOP (positive control) showed clear positive reactions.

Applicant's summary and conclusion

Conclusions:

AHTN is not photo-irritant to humans.

Executive summary:

AHTN (Tonalid®; non-GLP, purity >98% - 10% dilution in ethanol/DEP (3:1)) was tested for photoirritancy on 10 female human volunteers (white Caucasian; ages 18-39). Before application of the preparation for each of the subjects, the Minimal Erythemal Dose (MED) was determined using UV light irradiation from a xenon arc solar light simulator. Subsequently, areas on the back were stripped 3 times to remove the superficial stratum corneum; followed by application of 20μL of the test solution to 3 designated test sites, each approximately 1.5 cm in diameter. One of the sites was used as the non-irradiated control site and one site was irradiated but was not treated with AHTN. In addition, three of the 10 subjects were randomly selected and treated with 20μL of a 0.2 mg/ml solution of 8-methoxypsoralen in ethanol as a positive control. After 30 min of contact, one AHTN-treated site and the site not treated with AHTN were irradiated with 10 MED of UV-A followed by 0.5 MED of UVA + UVB The sites were scored 5 min after irradiation and again at 3, 24, 48 and 73 hr after irradiation. There were no significant reactions to the AHTN solution but all three subjects exposed to 8-MOP showed clear positive reactions.

Source: EU Risk Assessment Report AHTN, ECB May 2008