Reaction mass of Dicerium trisulfide and Dilanthanum trisulfide

Eye irritation

Administrative data

Endpoint:

eye irritation: in vivo

Type of information:

experimental study

Adequacy of study:

weight of evidence

Study period:

From 30 May 1994 to 30 August 1994

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1994

Report date:

1994

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 405 (Acute Eye Irritation / Corrosion)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.5 (Acute Toxicity: Eye Irritation / Corrosion)

Deviations:

no

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Dicerium trisulphide

EC Number:

234-603-7

EC Name:

Dicerium trisulphide

Cas Number:

12014-93-6

Molecular formula:

Ce2S3

IUPAC Name:

Dicerium trisulphide

Test material form:

solid: particulate/powder

Remarks:

powder

Details on test material:

- Name of test material (as cited in study report): Cerium sulphide

Test animals / tissue source

Species:

rabbit

Strain:

New Zealand White

Details on test animals or tissues and environmental conditions:

TEST ANIMALS
- Source: Elevage Cunicole de Val de Selle, 80160 Prouzel, France
- Age at study initiation: no data
- Weight at study initiation: 2.7 kg
- Housing: animals were housed individually in polystyrene cages (35 x 55 x 32 cm or 48.2 x 58 x 36.5 cm). Each cage was equiped wity a food container and a water bottle.
The housing conditions (temperature, relative humidity and light/dark cycle) were checked monthly.
- Diet: free access to 112 C pelleted diet (U.A.R., 91360 Villemoisson-sur-Orge, France). Each batch of food was analysed (composition and contaminants) by the supplier.
- Water: ad libitum, drinking water filtered by a F.G. Millipore membrane (0.22µm) and contained in bottles.
Bacteriological and chemical analysis of water and detection of possible contaminants (pesticides, heavy metals and nitrosamines) are performed periodically. There were no contaminants in the diet or water at levels likely to have influenced the outcome of the study.
- Acclimation period: at least 5 days before the beginning of the study.

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 18 ± 3°C
- Humidity (%): 30-70 %
The temperature and relative humidity were recorded continuously and records retained.
- Air changes (per hr):
- Photoperiod (hrs dark / hrs light): 12h/12h

IN-LIFE DATES: 21/06/1994 -24/06/1994

Test system

Vehicle:

unchanged (no vehicle)

Controls:

other: the right eye, which remained untreated, served as a control

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 0.1 g of the test material in its original form.

Duration of treatment / exposure:

Single introduction into the conjunctival sac of the left eyes of 3 animals after gently pulling the lower lid away from the eyeball. The lower and upper eyelids were held together for about one second to avoid any loss of test substance.

Observation period (in vivo):

1, 24, 48 and 72 hours after administration of the test substance.
When there is no evidence of irritation after 72 hours, the study is ended.

Number of animals or in vitro replicates:

3 males

Details on study design:

REMOVAL OF TEST SUBSTANCE
- Washing (if done): No, the eyes were not rinsed after administration of the test substance.

SCORING SYSTEM: Scale of 0 to 2 for Iris lesions and scale of 0 to 4 for all the other ocular reactions (according to OECD Guideline 405).

TOOL USED TO ASSESS SCORE: Fluorescein (batch no. 2815)

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

chemosis score

Basis:

mean

Remarks:

animal #1

Time point:

other: 24, 48 and 72 hours

Score:

0

Remarks on result:

other: score of 1 at the 1 hour time point

Results 2

Irritation parameter:

chemosis score

Basis:

mean

Remarks:

animal #2

Time point:

other: 24, 48 and 72 hours

Score:

0.3

Remarks on result:

other: score of 2 at 1 hour and score of 1 at 24 hours

Results 3

Irritation parameter:

chemosis score

Remarks:

24, 48 and 72 hours

Basis:

mean

Remarks:

animal#3

Time point:

24/48/72 h

Score:

0

Results 4

Irritation parameter:

conjunctivae score

Remarks:

24, 48 and 72 hours

Basis:

mean

Remarks:

animal#1

Time point:

24/48/72 h

Score:

0

Remarks on result:

other: red coloration by the test substance only at the 1 hour time point

Results 5

Irritation parameter:

conjunctivae score

Basis:

mean

Remarks:

animal#2

Time point:

other: 24, 48 and 72 hours

Score:

0.7

Remarks on result:

other: red coloration by the test substance at the 1 hour time point and score of 2 at the 24 hour time point

Results 6

Irritation parameter:

conjunctivae score

Basis:

mean

Remarks:

animal#3

Time point:

other: 24, 48 and 72 hours

Score:

0

Results 7

Irritation parameter:

iris score

Remarks:

24, 48 and 72 hours

Basis:

mean

Remarks:

animal#1

Time point:

24/48/72 h

Score:

0

Results 8

Irritation parameter:

iris score

Basis:

mean

Remarks:

animal#2

Time point:

other: 24, 48 and 72 hours

Score:

0

Results 9

Irritation parameter:

iris score

Basis:

mean

Remarks:

animal#3

Time point:

other: 24, 48 and 72 hours

Score:

0

Results 10

Irritation parameter:

cornea opacity score

Remarks:

24, 48 and 72 hours

Basis:

mean

Remarks:

animal#1

Time point:

24/48/72 h

Score:

0

Results 11

Irritation parameter:

cornea opacity score

Basis:

mean

Remarks:

animal#2

Time point:

other: 24, 48 and 72 hours

Score:

0

Results 12

Irritation parameter:

cornea opacity score

Basis:

mean

Remarks:

animal#3

Time point:

other: 24, 48 and 72 hours

Score:

0

Results 13

Irritation parameter:

other: discharge

Basis:

other: all 3 animals

Time point:

other: 1 hour

Remarks on result:

other: scoring obscured by residual test substance

Results 14

Irritation parameter:

other: discharge

Basis:

mean

Remarks:

animal#1

Time point:

other: 24, 48 and 72 hours

Score:

0

Results 15

Irritation parameter:

other: discharge

Basis:

mean

Remarks:

animal#2

Time point:

other: 24, 48 and 72 hours

Score:

0

Results 16

Irritation parameter:

other: discharge

Basis:

mean

Remarks:

animal#3

Time point:

other: 24, 48 and 72 hours

Score:

0

Irritant / corrosive response data:

- After introduction of the test substance, slight conjunctival irritation (chemosis: scores of 1 or 2; redness: score of 2 was observed in all 3 animals.
- The mean scores over 24, 48 and 72 hours for individual animals were lower than 1.0 for chemosis and redness.
- On day 3, conjunctivai irritation had reversed.
- No iridial irritation and no corneal opacity were observed.
- The test substance obscured evaluation of discharge on day 1.

Other effects:

No other effects.

Applicant's summary and conclusion

Interpretation of results:

not classified

Remarks:

Criteria used for interpretation of results: EU

Conclusions:

The mean scores for chemosis, redness, iris and degree of corneal opacity for 2 out of the 3 animals did not reach the criteria values for irritation. Under the experimental conditions of the study, the test substance, Dicerium trisulphide, was considered as non-irritant when administered by ocular route in rabbits.

Executive summary:

The potential of the test substance Dicerium trisulphide to induce ocular irritation was evaluated in rabbits according to O.E.C.D (No. 405, 24th February 1987) and E.C. (92/69/E.E.C.) guidelines. The study was conducted in compliance with the principles of Good Laboratory Practice Regulations.

 

Method

Having confirmed that the test substance was not irritant or corrosive when administered by cutaneous route, a single dose of 0.1 g of the test substance in its original form was placed into the conjunctival sac of the left eyes of 3 male New Zealand White rabbits.

The eyes were not rinsed following the administration of the test substance.

Ocular reactions were observed approximately 1, 24, 48 and 72 hours after the administration.

The mean score of the values recorded for each animal after 24, 48 and 72 hours was calculated.

The interpretation of results was carried out according to the classification criteria laid down in Directive 93/21/E.E.C. Commission Directive of 27th April 1993 adapting to technical progress for the eighteenth time Council Directive 67/548/E.E.C.

 

Results

Slight conjunctival irritation (chemosis: score of 1 or 2, redness: score of 2) occurred for up to 24 hours post-introduction.

No iridial irritation and no corneal opacity were observed.

 

Conclusion

The mean scores for chemosis, redness, iris and degree of corneal opacity for 2 out of the 3 animals did not reach the criteria values for irritation. Under the experimental conditions of the study, the test substance, Dicerium trisulphide, was considered as non-irritant when administered by ocular route in rabbits.