Zinc dilactate

Eye irritation

Administrative data

Endpoint:

eye irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1995-01-25 to 1995-02-07

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with national standard methods

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1995

Report date:

1995

Materials and methods

Test guideline

Test guideline 1

Qualifier:

equivalent or similar to guideline

Guideline:

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

Test guideline 2

Qualifier:

according to guideline

Guideline:

other: Methodology indicated in the Official French Gazette of 09 June 1992

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Zinc dilactate

EC Number:

240-178-9

EC Name:

Zinc dilactate

Cas Number:

16039-53-5

Molecular formula:

C6H10O6Zn

IUPAC Name:

zinc dilactate

Test material form:

solid: particulate/powder

Remarks:

migrated information: powder

Details on test material:

LOT FD 851 CD

Test animals / tissue source

Species:

rabbit

Strain:

New Zealand White

Details on test animals or tissues and environmental conditions:

TEST ANIMALS
- Source: CARON - Saint Germain Laxis 77590 MAINCY
- Weight at study initiation: about 2.5 to 3 kg at the time of the trial
- Housing: The animals are kept in individual polystyrene cages of standardized dimensions with perforated floor.
- Diet (e.g. ad libitum): ad libitum
- Water (e.g. ad libitum): ad libitum
- Acclimation period: at least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 18 to 22
- Humidity (%): 50-80
- Air changes (per hr): filtered and recyled air is renewed at the the rate of 3000 m³/h
- Photoperiod (hrs dark / hrs light): 12/12

Test system

Vehicle:

unchanged (no vehicle)

Controls:

other: untreated eye used as control

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 0.1 g

Duration of treatment / exposure:

0.1 g of the test item is instilled in the lower right fornix of conjunctiva in each animal. The eyelids of the animals are kept shut for about 10 seconds in order to avoid product loss. The eyes are not rinsed.

Observation period (in vivo):

1, 24, 48 and 72 hours until day 7.

Number of animals or in vitro replicates:

3

Details on study design:

REMOVAL OF TEST SUBSTANCE
- Washing (if done): no
- Time after start of exposure: not applicable

SCORING SYSTEM: according to Draize

TOOL USED TO ASSESS SCORE: fluorescein

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

cornea opacity score

Basis:

animal #1

Time point:

24/48/72 h

Score:

3.33

Max. score:

4

Reversibility:

not fully reversible within: 7 d

Results 2

Irritation parameter:

cornea opacity score

Basis:

animal #2

Time point:

24/48/72 h

Score:

2.66

Max. score:

4

Reversibility:

not fully reversible within: 7 d

Results 3

Irritation parameter:

cornea opacity score

Basis:

animal #3

Time point:

24/48/72 h

Score:

1

Max. score:

1

Reversibility:

fully reversible within: 4 d

Results 4

Irritation parameter:

iris score

Basis:

animal #1

Time point:

24/48/72 h

Score:

1.66

Max. score:

2

Reversibility:

not fully reversible within: 7 d

Results 5

Irritation parameter:

iris score

Basis:

animal #2

Time point:

24/48/72 h

Score:

2

Max. score:

2

Reversibility:

not fully reversible within: 7 d

Results 6

Irritation parameter:

iris score

Basis:

animal #3

Time point:

24/48/72 h

Score:

1.33

Max. score:

2

Reversibility:

fully reversible within: 4 d

Results 7

Irritation parameter:

chemosis score

Basis:

animal #1

Time point:

24/48/72 h

Score:

2.33

Max. score:

3

Reversibility:

not fully reversible within: 7 d

Results 8

Irritation parameter:

chemosis score

Basis:

animal #2

Time point:

24/48/72 h

Score:

2

Max. score:

2

Reversibility:

not fully reversible within: 7 d

Results 9

Irritation parameter:

chemosis score

Basis:

animal #3

Time point:

24/48/72 h

Score:

1.66

Max. score:

2

Reversibility:

fully reversible within: 4 d

Results 10

Irritation parameter:

conjunctivae score

Basis:

animal #1

Time point:

24/48/72 h

Score:

2

Max. score:

2

Reversibility:

not fully reversible within: 7 d

Results 11

Irritation parameter:

conjunctivae score

Basis:

animal #2

Time point:

24/48/72 h

Score:

2

Max. score:

2

Reversibility:

not fully reversible within: 7 d

Results 12

Irritation parameter:

conjunctivae score

Basis:

animal #3

Time point:

24/48/72 h

Score:

2

Max. score:

2

Reversibility:

not fully reversible within: 7 d

Irritant / corrosive response data:

The observed lesions are severe. The corneal injuries are serious, involving the whole cornea, slightly reversible until D7 but still remaining for 2 animals over 1/2 cornea. The iris congestion is severe; the photomotor reflex is slowed down; the reversibility is total at D7 for only one animal. The conjunctival injuries are important, slowly reversible over 7 days, the reversibility is not total at D7.

Applicant's summary and conclusion

Interpretation of results:

Category 1 (irreversible effects on the eye) based on GHS criteria

Conclusions:

In conclusion, zinc lactate is very irritating to the eye.

Executive summary:

In a primary eye irritation study (equivalent to OECD 405), 0.1 g of the test item was instilled into the lower right fornix of the conjunctiva of three New Zealand White rabbits. The animals were observed for 7 days. Irritation was scored by the method according to OECD guideline 405. Based on the results, it can be considered that the test item is very irritating to the eye.