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Toxicological information

Eye irritation

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Administrative data

Endpoint:
eye irritation: in vitro / ex vivo
Type of information:
experimental study
Adequacy of study:
key study
Study period:
June 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
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)
GLP compliance:
yes (incl. QA statement)

Test material

Constituent 1
Reference substance name:
Reaction mass of butyl phenyl hydrogen phosphate and diphenyl hydrogen phosphate and phenyl dihydrogen phosphate
EC Number:
950-250-8
IUPAC Name:
Reaction mass of butyl phenyl hydrogen phosphate and diphenyl hydrogen phosphate and phenyl dihydrogen phosphate
Constituent 2
Chemical structure
Reference substance name:
Butan-1-ol
EC Number:
200-751-6
EC Name:
Butan-1-ol
Cas Number:
71-36-3
Molecular formula:
C4H10O
IUPAC Name:
1-Butanol
Test material form:
liquid
Specific details on test material used for the study:
STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: room temperature
- Stability under test conditions: stable

Test animals / tissue source

Species:
cattle
Strain:
not specified
Details on test animals or tissues and environmental conditions:
The test system is the isolated bovine cornea. Bovine eyes are obtained as a by-product of reshly slaughtered cattle.

SOURCE OF COLLECTED EYES
- Source: Schlathof Alzey, Emil Färber GmbH & Co KG, Alzey
- Characteristics of donor animals (e.g. age, sex, weight): minimum 12 months, maximum 60 months

Corneas free of defects (opacity, scratches, pigmentation etc.) were dissected with a 2 to 3 mm rim of sclera. Isolated corneas were mounted in cornea holders that consists of anterior and posterior chambers. Both chambers were filled to excess with pre-warmed Eagle’s MEM (without phenol red) and then equilibrated in a vertical position at about 32°C for at least 1 hour.
After the equilibration period, the medium in both chambers was replaced by fresh pre-warmed medium and initial corneal opacity readings were taken for each cornea with an opacitometer. Any corneas that showed macroscopic tissue damage or an opacity value < 556 opacity units* were discarded. The remaining corneas were then distributed into negative control, positive control and treatment groups. Each corneal holder was uniquely identified with a number on the chambers.

Test system

Vehicle:
unchanged (no vehicle)
Controls:
yes, concurrent positive control
yes, concurrent negative control
Amount / concentration applied:
750 µl
Duration of treatment / exposure:
10 minutes
Duration of post- treatment incubation (in vitro):
2h
Number of animals or in vitro replicates:
3
Details on study design:


REMOVAL OF TEST SUBSTANCE
- Number of washing steps after exposure period: 4 times with Eagle's MEM

METHODS FOR MEASURED ENDPOINTS:
- Corneal opacity: opacitometer
- Corneal permeability: passage of sodium fluorescein dye measured with the aid of microtiter plate reader (OD490)

SCORING SYSTEM: In Vitro Irritancy Score (IVIS)

DECISION CRITERIA: decision criteria as indicated in the TG was used.

Results and discussion

In vitro

Resultsopen allclose all
Irritation parameter:
cornea opacity score
Run / experiment:
Mean
Value:
241.4
Negative controls validity:
valid
Positive controls validity:
valid
Remarks on result:
positive indication of irritation
Irritation parameter:
other: Permeability score (OD490)
Run / experiment:
Mean
Value:
0.002
Negative controls validity:
valid
Positive controls validity:
valid
Irritation parameter:
in vitro irritation score
Run / experiment:
Mean
Value:
241.5
Negative controls validity:
valid
Positive controls validity:
valid
Remarks on result:
positive indication of irritation

Applicant's summary and conclusion

Interpretation of results:
Category 1 (irreversible effects on the eye) based on GHS criteria
Conclusions:
Based on the results of the BCOP Test, it was concluded that Phenyl acid phosphate causes serious eye damage in the in vitro eye irritation test strategy under the test conditions chosen.
Executive summary:

The objective was to assess the eye irritating potential of Phenyl acid phosphate. The potential of the test substance to cause ocular irritation or serious damage to the eyes was assessed by a single topical application of 750 μL undiluted test substance to the epithelial surface of isolated bovine corneas.

Three corneas were treated with the test substance for 10 minutes followed by a 2-hour post-incubation period. In addition to the test substance, a negative control (NC; deionized water) and two positive

controls (PC1 / PC2; 100% ethanol / 100% dimethylformamide) were applied to three corneas each.

Corneal opacity was quantitatively measured as the amount of light transmitted through the cornea. Permeability was quantitatively measured as the amount of sodium fluorescein dye that passes across the full thickness of the cornea. Both measurements were used to calculate an In Vitro Irritancy Score of the test substance.

Based on the results of the BCOP Test, it was concluded that Phenyl acid phosphate causes serious eye damage in the in vitro eye irritation test strategy under the test conditions chosen.