Alkaline earth metal and zinc hydroxy(substituted)acetate complexes and alkaline earth metal glyoxylate

Eye irritation

Administrative data

Endpoint:

eye irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Sep 2017 - Jan 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2018

Report date:

2018

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 437 (Bovine Corneal Opacity and Permeability Test Method for Identifying i) Chemicals Inducing Serious Eye Damage and ii) Chemicals Not Requiring Classification for Eye Irritation or Serious Eye Damage)

Version / remarks:

edition adopted 09. Oct. 2017

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU method B.47 (Bovine corneal opacity and permeability test method for identifying ocular corrosives and severe irritants)

Version / remarks:

adopted 14. Feb. 2017

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test material

Reference

Name:

Unnamed

Type:

Constituent

Test material form:

solid: particulate/powder

Test animals / tissue source

Species:

cattle

Details on test animals or tissues and environmental conditions:

Species Bos primigenius Taurus (fresh bovine corneas)

Fresh bovine eyes were obtained from the slaughterhouse Müller Fleisch GmbH, Enzstr. 2-4, 75217 Birkenfeld, Germany, on the day of the test. The cattle were between 12 and 60 months old. The eyes were transported to the test facility in Hanks’ Balanced Salt Solution with 1% Penicillin-Streptomycin solution (Penicillin 100 U/mL, Streptomycin 100 μg/mL) in a suitable cooled container.

Test system

Vehicle:

Hank's balanced salt solution

Controls:

yes, concurrent vehicle

yes, concurrent positive control

Amount / concentration applied:

test item: 20 % in HBSS
negative control: HBSS: Hank’s Balanced Salt Solution (HBSS) 10-fold concentrated, diluted in demin. water (1:10), batch no.: 20171128
positive control: Imidazole solution: 20% C3H4N2 (CAS-No. 288-32-4), dissolved in HBSS, batch no.: 20171128

Duration of treatment / exposure:

4 hours at 32 ± 1 °C

Duration of post- treatment incubation (in vitro):

90 minutes at 32 ± 1 °C

Number of animals or in vitro replicates:

3

Results and discussion

In vitro

Results

Results 1

Irritation parameter:

in vitro irritation score

Run / experiment:

1

Value:

2.78

Vehicle controls validity:

valid

Positive controls validity:

valid

Results 2

Irritation parameter:

in vitro irritation score

Run / experiment:

2

Value:

0.56

Vehicle controls validity:

valid

Positive controls validity:

valid

Results 3

Irritation parameter:

in vitro irritation score

Run / experiment:

3

Value:

0.97

Vehicle controls validity:

valid

Positive controls validity:

valid

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

The test item showed no effects on the cornea of the bovine eye. The calculated IVIS is 1.44.

Executive summary:

This in vitro study, according to OECD guideline 437 and EU Method B.47, under GLP-conditions, was performed to assess corneal damage potential of the test item by quantitative measurements of changes in opacity and permeability in a bovine cornea.

Two experiments were performed. The first experiment was considered invalid because all of the three replicates caused different classifications. The first experiment is not reported but the raw data are kept in the GLP-archive of the test facility. The second experiment was considered as valid. Only the second experiment is reported here. The test item was brought onto the cornea of a bovine eye which previously had been incubated with cMEM without phenol red at 32 ± 1 °C for 1 hour and whose opacity had been determined. The test item was incubated on the cornea for 4 hours at 32 ± 1 °C. After removal of the test item, opacity and permeability values were measured. The test item was tested as 20% solution in HBSS. Under the conditions of this test, the test item showed no effects on the cornea of the bovine eye. The calculated IVIS (In Vitro Irritancy Score) is 1.44. According to OECD Guideline no. 437 (Oct. 2017), a substance with an IVIS ≤ 3 requires no classification for eye irritation or serious eye damage. The negative control (HBSS) and the positive control (20% imidazole solution) have met the validity criteria. No observations were made which might cause doubts concerning the validity of the study outcome. The test is considered valid.