Registration Dossier

Administrative data

Endpoint:
eye irritation, other
Type of information:
experimental study
Adequacy of study:
key study
Study period:
22 February 2018 to 10 September 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 guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 437 (Bovine Corneal Opacity and Permeability Test Method for Identifying Ocular Corrosives and Severe Irritants)
Deviations:
no
Qualifier:
according to
Guideline:
EU method B.47 (Bovine corneal opacity and permeability test method for identifying ocular corrosives and severe irritants)
Deviations:
no
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Type:
Constituent
Type:
Constituent
Test material form:
liquid
Specific details on test material used for the study:
Purity: >95% (nominal); a substance of Unknown or Variable composition, Complex reaction products or Biological materials (UVCB)
Physical state/Appearance: Amber Liquid

Test animals / tissue source

Species:
cattle
Strain:
not specified
Details on test animals or tissues and environmental conditions:
Eyes from adult cattle (typically 12 to 60 months old) were obtained from a local abattoir as a by-product from freshly slaughtered animals. The eyes were excised by an abattoir employee after slaughter, and were placed in Hanks’ Balanced Salt Solution (HBSS) supplemented with antibiotics (penicillin at 100 IU/mL and streptomycin at 100 μg/mL). They were transported to the test facility over ice packs on the same day of slaughter. The corneas were prepared immediately on arrival.

Test system

Vehicle:
unchanged (no vehicle)
Controls:
yes, concurrent positive control
yes, concurrent negative control
Amount / concentration applied:
0.75 mL of the test item or control items were applied to the appropriate corneas
Duration of treatment / exposure:
Each holder was incubated, anterior chamber uppermost, at 32 ± 1 ºC for 10 minutes
Duration of post- treatment incubation (in vitro):
120 minutes
Number of animals or in vitro replicates:
3
Details on study design:
Preparation of Corneas
The cornea from each selected eye was removed leaving a 2 to 3 mm rim of sclera to facilitate handling, and the iris and lens were peeled away from the cornea. The isolated corneas were immersed in a dish containing HBSS until they were mounted in Bovine Corneal Opacity and Permeability (BCOP) holders. The chambers of each BCOP holder were filled with complete Eagle’s Minimum Essential Medium (EMEM) without phenol red, plugged and incubated at 32 ± 1 ºC for 60 minutes. At the end of the incubation period each cornea was examined for defects, only corneas free of damage were used.

Selection of Corneas and Opacity Reading
The medium from both chambers of each holder was replaced with fresh complete EMEM and a pre treatment opacity reading was taken for each cornea using a calibrated opacitometer. The average opacity for all corneas was calculated.

Treatment of Corneas
The EMEM was removed from the anterior chamber of the BCOP holder and the test item or control items were applied to the appropriate corneas and each holder was incubated at 32 ± 1 ºC for 10 minutes.
At the end of the exposure period the test item and control items were removed from the anterior chamber and the cornea was rinsed with fresh complete EMEM containing phenol red before a final rinse with complete EMEM without phenol red. The chamber was then refilled with fresh complete EMEM without phenol red. A post treatment opacity reading was taken and each cornea was visually observed.
The holders were incubated at 32 ± 1 ºC for 120 minutes. After incubation, the medium from both chambers was replaced with fresh complete EMEM and a final opacity reading was taken. Each cornea was visually observed.

Application of Sodium Fluorescein
Following the final opacity measurement the permeability of the corneas to sodium fluorescein was evaluated. The medium was removed and replaced with sodium fluorescein solution (4 mg/mL). The dosing holes were plugged and the holders incubated, anterior chamber uppermost, at 32 ± 1 ºC for 90 minutes.

Permeability Determinations
After incubation the medium in the posterior chamber of each holder was decanted and retained.
360 µL of media representing each cornea was dispensed into the appropriate wells of a pre labeled 96 well plate. The optical density was measured (quantitative viability analysis) at 492 nm (without a reference filter) using the Labtech LT-4500 microplate reader and LT-com software.

Results and discussion

In vitro

Results
Irritation parameter:
in vitro irritation score
Run / experiment:
10 minute exposure period and 120 minutes post exposure
Value:
0.2
Vehicle controls validity:
valid
Negative controls validity:
valid
Positive controls validity:
valid
Remarks on result:
no indication of irritation

Applicant's summary and conclusion

Interpretation of results:
GHS criteria not met
Conclusions:
Based on the results of the BCOP test, the test material score of 0.2 indicates it is not an eye irritant.
Executive summary:

In a study performed to the standardized guidelines OECD 437 and EU Test Method B.47., under GLP conditions, the test material is not an irritant to eye, not requiring classification.