1,3-Cyclopentanedione, 2-[2-(3,4-dihydro-6-methoxy-1(2H)-naphthalenylidene)ethyl]-2-methyl-

Eye irritation

Administrative data

Endpoint:

eye irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Well documented study according to international accepted guidelines and GLP compliant.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2014

Report date:

2014

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 405 (Acute Eye Irritation / Corrosion)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

2-[(2E)-2-(6-Methoxy-3,4-dihydronaphthalen-1(2H)-ylidene)ethyl]-2-methylcyclopentane-1,3-dione

EC Number:

618-321-5

Cas Number:

899-79-6

Molecular formula:

C19H22O3

IUPAC Name:

2-[(2E)-2-(6-Methoxy-3,4-dihydronaphthalen-1(2H)-ylidene)ethyl]-2-methylcyclopentane-1,3-dione

Test material form:

solid: crystalline

Details on test material:

Test item: Methyl-secodione
CAS number: 899-79-6
Batch number: L3B022N
Physical state: Crystalline powder
Colour: Beige
Storage: At a temperature of 15 to 30 °C

Test animals / tissue source

Species:

rabbit

Strain:

New Zealand White

Details on test animals or tissues and environmental conditions:

Species and strain: New Zealand white rabbit
Source: S&K LAP Kft.
Hygienic level during the study: good conventional
Number of animal: 3 males
Age of animals: adult rabbits, 11 weeks old
Body weight range at the beginning of the study: 2460 - 2856 g
Body weight range at the end of the study: 2558 - 2974 g
Acclimatisation time: 5 days in first animal, 6 days in second and third animal
Animal health: Only animals in acceptable health condition were used for the test.

Housing: Animals were housed individually in metal cage.
Light: 12 hours daily, from 6.00 a.m. to 6.00 p.m.
Temperature: 20 ± 3 °C
Relative humidity: 30-70 %
Ventilation: 10-15 air exchanges/hour by central air-condition system

Test system

Vehicle:

unchanged (no vehicle)

Controls:

other: The contralateral eye served as control.

Amount / concentration applied:

0.1 g of the finely grounded test item was used for the study, as a single dose.

Duration of treatment / exposure:

The eyes of the test animals were not washed out 24 hour after test item application, because the test item had been removed from the eye of test animal by physiological mechanisms.

Observation period (in vivo):

The eyes were examined at 1, 24, 48 and 72 hours after the application.

Number of animals or in vitro replicates:

3 male

Details on study design:

In the first step an initial test was performed using one animal. The test item was placed into the conjunctival sac of the left eye. The eyelids were held closed gently for about one second to prevent any loss of the test item. The contralateral eye served as control.
In the initial test no irritant effect was observed 24 hours after treatment. The confirmatory test was conducted using a second and third animal.

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

cornea opacity score

Remarks:

(opacity)

Basis:

mean

Time point:

other: 24h, 48h, 72h

Score:

0

Max. score:

0

Results 2

Irritation parameter:

iris score

Basis:

mean

Time point:

other: 24h, 48h, 72h

Score:

0

Max. score:

0

Results 3

Irritation parameter:

other: redness (conjunctival)

Basis:

mean

Time point:

other: 24h, 48h, 72h

Score:

0

Max. score:

0

Results 4

Irritation parameter:

chemosis score

Remarks:

(conjunctival)

Basis:

mean

Time point:

other: 24h, 48h, 72h

Score:

0

Max. score:

0

Results 5

Irritation parameter:

other: conjunctival discharge

Basis:

mean

Time point:

other: 24h, 48h, 72h

Score:

0

Max. score:

0

Irritant / corrosive response data:

Treated and control eyes were examined at 1, 24, 48 and 72 hours after the application.
One hour after treatment some hyperemic blood vessels (score 1) of the conjunctivae were observed in two animals. The swelling of the conjunctivae was different from normal (score 1) in one animal. The amount of discharge was different from normal (score 1) in two animals.
24 hours after treatment all animals were free of symptoms.
48 hours after treatment all animals were free of symptoms.
72 hours after treatment all animals were free of symptoms.

Applicant's summary and conclusion

Interpretation of results:

not irritating

Remarks:

Migrated information Criteria used for interpretation of results: OECD GHS

Conclusions:

In conclusion, test item Methyl-secodione (CAS 899-79-6) applied to the rabbits' eye mucosa caused slight conjunctival irritant effects which were fully reversible within 24 hours. The test item cannot be classified into any hazard category for eye irritation.