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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:
15-Jul-2014
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
The hypothesis for the analogue approach is that the test substance, Hydrocarbons, C10-C13, n-alkanes, isoalkanes, <2% aromatics, contains constituents which are part of the same homologous series as the constituents of the target substance, Hydrocarbons, C11-C16, n-alkanes, isoalkanes, <2% aromatics. The two substances have some constituents in common and contain no functional groups that are structural alerts for skin sensitisation. The substances therefore have qualitatively similar properties (RAAF Scenario 2 applies). A discussion and report on the read across strategy is given as an attachment in IUCLID Section 13.
Cross-reference
Reason / purpose for cross-reference:
read-across: supporting information
Reference
Endpoint:
eye irritation: in vitro / ex vivo
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Study period:
15-Jul-2014
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Justification for type of information:
The hypothesis for the analogue approach is that the test substance, Hydrocarbons, C10-C13, n-alkanes, isoalkanes, <2% aromatics, contains constituents which are part of the same homologous series as the constituents of the target substance, Hydrocarbons, C11-C16, n-alkanes, isoalkanes, <2% aromatics. The two substances have some constituents in common and contain no functional groups that are structural alerts for skin sensitisation. The substances therefore have qualitatively similar properties (RAAF Scenario 2 applies). A discussion and report on the read across strategy is given as an attachment in IUCLID Section 13.
Reason / purpose for cross-reference:
read-across source
Vehicle:
unchanged (no vehicle)
Irritation parameter:
in vitro irritation score
Run / experiment:
Time point: 10 minutes
Value:
-0.5
Vehicle controls validity:
not applicable
Negative controls validity:
valid
Positive controls validity:
valid
Remarks on result:
no indication of irritation
Interpretation of results:
GHS criteria not met
Remarks:
Criteria used for interpretation of results: EU
Conclusions:
An in vitro eye irritation study was conducted with Hydrocarbons, C10-C13, n-alkanes, isoalkanes, <2% aromatics (GS190), in accordance with OECD test guideline 437 and in compliance with GLP. The BCOP test did not indicate an irritancy potential based on either the opacity or permeability endpoints.
Executive summary:

This data is being read across from the source study that testedHydrocarbons, C10-C13, n-alkanes, isoalkanes, <2% aromaticsbased on analogue read across.

The negative control responses of the opacity and permeability values were less than the upper limits of the laboratory historical range indicating that the negative control did not induce irritancy on the corneas.The mean in vitro irritancy score of the positive control (10% (w/v) Benzalkonium Chloride) was 139 and within the historical positive control data range. It was therefore concluded that the test conditions were adequate and that the test system functioned properly.

Hydrocarbons, C10-C13, n-alkanes, isoalkanes, <2% aromatics did not induce ocular irritation through both endpoints, resulting in a mean in vitro irritancy score of -0.5 after 10 minutes of treatment.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2014
Report date:
2014

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
OECD Guideline 437 (Bovine Corneal Opacity and Permeability Test Method for Identifying Ocular Corrosives and Severe Irritants)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU method B.47 (Bovine corneal opacity and permeability test method for identifying ocular corrosives and severe irritants)
Deviations:
no
GLP compliance:
yes (incl. QA statement)

Test material

Constituent 1
Chemical structure
Reference substance name:
Hydrocarbons, C10-C13, n-alkanes, isoalkanes, <2% aromatics
EC Number:
940-726-3
Cas Number:
185857-36-7
Molecular formula:
C10H22 to C13H28
IUPAC Name:
Hydrocarbons, C10-C13, n-alkanes, isoalkanes, <2% aromatics
Test material form:
other: liquid
Details on test material:
- Name of test material (as cited in study report): Hydrocarbons, C10-C13, n-alkanes, isoalkanes, <2% aromatics
- Substance type: Clear colourless liquid
- Physical state: Liquid
- Storage condition of test material: At room temperature in the dark


Test system

Vehicle:
unchanged (no vehicle)
Amount / concentration applied:
TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 750 µl per cornea

NEGATIVE CONTROL
- Amount(s) applied (volume or weight with unit): 750 µl of physiological saline per cornea

POSITIVE CONTROL
Amount(s) applied (volume or weight with unit): 750 µl per cornea
Concentration (if solution): 10% (w/v) Benzalkonium Chloride


Duration of treatment / exposure:
10 minutes
Details on study design:
TEST SITE
- Isolated bovine cornea

REMOVAL OF TEST SUBSTANCE
- Washing (if done): yes
- Time after start of exposure: 15 minutes

SCORING SYSTEM:
- After exposure the cornea was thoroughly rinsed to remove the test substance and incubated for 2 hours with fresh medium followed by opacity measurement and the permeability of the corneas was determined after a 90 minutes incubation period with sodium fluorescein.

- The mean opacity and mean permeability values (OD490) were used for each treatment group to calculate an in vitro score:

In vitro irritancy score (IVIS) = mean opacity value + (15 x mean OD490 value).


TOOL USED TO ASSESS SCORE:
- opacitymeter and microplate reader

DATA EVALUATION:
In vitro score range UN GHS
≤ 3 No Category
> 3; ≤ 55 No prediction can be made
>55 Category 1

Results and discussion

In vitro

Results
Irritation parameter:
in vitro irritation score
Run / experiment:
Time point: 10 minutes
Value:
-0.5
Vehicle controls validity:
not applicable
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
Remarks:
Criteria used for interpretation of results: EU
Conclusions:
An in vitro eye irritation study was conducted with Hydrocarbons, C10-C13, n-alkanes, isoalkanes, <2% aromatics (GS190), in accordance with OECD test guideline 437 and in compliance with GLP. The BCOP test did not indicate an irritancy potential based on either the opacity or permeability endpoints.
Executive summary:

The negative control responses of the opacity and permeability values were less than the upper limits of the laboratory historical range indicating that the negative control did not induce irritancy on the corneas.The mean in vitro irritancy score of the positive control (10% (w/v) Benzalkonium Chloride) was 139 and within the historical positive control data range. It was therefore concluded that the test conditions were adequate and that the test system functioned properly.

Hydrocarbons, C10-C13, n-alkanes, isoalkanes, <2% aromatics did not induce ocular irritation through both endpoints, resulting in a mean in vitro irritancy score of -0.5 after 10 minutes of treatment.