2-ethylhexanoic acid, zirconium salt

Eye irritation

Administrative data

Endpoint:

eye irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2012-12-17 to 2013-01-05

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2013

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 405 (Acute Eye Irritation / Corrosion)

Version / remarks:

adopted 2002-04-24

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

signed 2012-11-30

Test material

Test material information

Constituent 1

Reference substance name:

2-ethylhexanoic acid, zirconium salt

EC Number:

245-018-1

EC Name:

2-ethylhexanoic acid, zirconium salt

Cas Number:

22464-99-9

Molecular formula:

C8H16O2.xZr

IUPAC Name:

2-ethylhexanoic acid, zirconium salt

Test material form:

solid: particulate/powder

Remarks:

migrated information: powder

Test animals / tissue source

Species:

rabbit

Strain:

New Zealand White

Details on test animals or tissues and environmental conditions:

TEST ANIMALS - New Zealand White (Hsdlf:NZW) strain rabbits
- Source: Harlan Laboratories UK Ltd., Leicestershire, UK
- Age at study initiation: twelve to twenty weeks old
- Weight at study initiation: 2.801 or 3.34 kg
- Housing: the animals were individually housed in suspended cages.
- Diet (ad libitum): 2930C Teklad Global Rabbit diet supplied by Harlan Laboratories UK Ltd., Oxon, UK)
- Water (ad libitum): mains drinking water
- Acclimation period: at least five days

The animals were provided with environmental enrichment items which were considered not to contain any contaminant of a level that might have affected the purpose or integrity of the study.

ENVIRONMENTAL CONDITIONS
- Temperature: 17 to 23°C
- Relative humidity: 30 to 70%
- Air exchange: at least fifteen changes per hour
- Photoperiod (hrs dark / hrs light): 12/12

Test system

Vehicle:

unchanged (no vehicle)

Controls:

no

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): a volume of 0.1 mL of the test item, which was found to weigh approximately 88 mg was placed into the conjunctival sac of the right eye, formed by gently pulling the lower lid away from the eyeball. The upper and lower eyelids were held together for about one second immediately after treatment, to prevent loss of the test item, and then released. The left eye remained untreated and was used for control purposes.

Duration of treatment / exposure:

not applicable

Observation period (in vivo):

Approximately 1 hour and 24, 48 and 72 hours as well as 7 days following treatment

Number of animals or in vitro replicates:

2 male rabbits

Details on study design:

Immediately before the start of the test, both eyes of the provisionally selected test rabbits were examined for evidence of ocular irritation or defect with the aid of a light source from a standard ophthalmoscope. Only animals free of ocular damage were used.

INITIAL AND CONFIRMATORY TEST
Initially, a single rabbit was treated. Immediately after administration of the test item, an assessment of the initial pain reaction was made according to the six point scale (please refer to table 2 in the field "Any other information on materials and methods incl. tables" below).
After consideration of the ocular responses produced in the first treated animal, a second animal was treated.

SCORING SYSTEM: according to the Draize scale
Any other ocular effects were also noted.
Any clinical signs of toxicity, if present, were also recorded.
Individual body weights were recorded on Day 0 (the day of dosing) and at the end of the observation period.
If evidence of irreversible ocular damage is noted, the test item will be classified as corrosive to the eye.

TOOL USED TO ASSESS SCORE: examination of the eye was facilitated by the use of the light source from a standard ophthalmoscope.

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

cornea opacity score

Basis:

mean

Remarks:

animal #1

Time point:

24/48/72 h

Score:

0

Max. score:

4

Remarks on result:

other: Initial pain reaction: slight initial pain was observed. Slight discharge was observed 1 hour after test substance administration.

Results 2

Irritation parameter:

iris score

Basis:

mean

Remarks:

animal #1

Time point:

24/48/72 h

Score:

0

Max. score:

2

Results 3

Irritation parameter:

conjunctivae score

Basis:

mean

Remarks:

animal #1

Time point:

24/48/72 h

Score:

1

Max. score:

3

Reversibility:

fully reversible within: 7 days

Remarks on result:

other: Moderate conjunctivae redness was observed 1 hour after test substance administration.

Results 4

Irritation parameter:

chemosis score

Basis:

mean

Remarks:

animal #1

Time point:

24/48/72 h

Score:

0.33

Max. score:

4

Reversibility:

fully reversible within: 48 hours

Remarks on result:

other: Slight chemosis was observed 1 hour after test substance administration.

Results 5

Irritation parameter:

cornea opacity score

Basis:

mean

Remarks:

animal #2

Time point:

24/48/72 h

Score:

0

Max. score:

4

Remarks on result:

other: Initial pain reaction: slight initial pain was observed. Slight discharge was observed 1 hour and 24 hours after test substance administration. Alopecia around the treated eye was observed 24, 48 and 72 hours after test substance administration.

Results 6

Irritation parameter:

iris score

Basis:

mean

Remarks:

animal #2

Time point:

24/48/72 h

Score:

0

Max. score:

2

Remarks on result:

other: Slight iridial inflammation was observed 1 hour after test substance administration.

Results 7

Irritation parameter:

conjunctivae score

Basis:

mean

Remarks:

animal #2

Time point:

24/48/72 h

Score:

0.33

Max. score:

3

Reversibility:

fully reversible within: 48 hours

Remarks on result:

other: Moderate conjunctivae redness was observed 1 hour after test substance administration.

Results 8

Irritation parameter:

chemosis score

Basis:

mean

Remarks:

animal #2

Time point:

24/48/72 h

Score:

0.33

Max. score:

4

Reversibility:

fully reversible within: 48 hours

Remarks on result:

other: Slight chemosis was observed 1 hour after test substance administration.

Irritant / corrosive response data:

No corneal effects were noted during the study.
Iridial inflammation was noted in one treated eye one hour after treatment.
Moderate conjunctival irritation was noted in both treated eyes one hour after treatment. Minimal conjunctival irritation was noted in both treated eyes at the 24-Hour observation and in one treated eye at the 48 and 72-Hour observations.
Alopecia around the treated eye was noted in one animal at the 24, 48 and 72-Hour observations.
One treated eye appeared normal at the 48-Hour observation and the other treated eye appeared normal at the 7-Day observation.

Other effects:

- Body weight: both animals showed expected gain in body weight during the study.

Applicant's summary and conclusion

Interpretation of results:

not irritating

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

The test material is not irritating to the eyes.
According to 67/548/EC and subsequent regulations, the substance is not classified as an eye irritant.
According to the EC Regulation No. 1272/2008 and subsequent regulations, the substance is not classified as an eye irritant.