4''-Butoxy-4-ethyl-2',2'',3''-trifluoro-[1,1':4',1'']-terphenyl

Eye irritation

Administrative data

Endpoint:

eye irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

April 25, 2017 - June 12, 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2017

Report date:

2017

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 Ocular Corrosives and Severe Irritants)

Version / remarks:

2013

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:

Commission Regulation (EU) No. 1152/2010 amending, for the purpose of its adaption to technical progress, Regulation (EC) No. 440/2008 laying down test methods pursuant to Regulation (EC) No. 1907/2006 of the European Parliament and the council on the Registration, Evaluation, Authorisation and Restriction of Chemicals (REACH).

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

4-butoxy-4'-(4-ethylphenyl)-2,3,3'-trifluoro-1,1'-biphenyl

EC Number:

812-028-8

Cas Number:

612543-60-9

Molecular formula:

C24H23F3O

IUPAC Name:

4-butoxy-4'-(4-ethylphenyl)-2,3,3'-trifluoro-1,1'-biphenyl

Test material form:

solid: bulk

Test system

Vehicle:

physiological saline

Controls:

yes, concurrent vehicle

yes, concurrent positive control

Amount / concentration applied:

TEST MATERIAL: 750 µL (i.e. 150mg/750µL)

NEGATIVE / VEHICLE CONTROL: 750 µL

Designation: 0.9% sodium chloride solution
Supplier: B. Braun Melsungen AG, Germany
Batch: 16435011
Storage: 2 to 8°C
Released until: September 2019


POSITIVE CONTROL: 750 µL

Designation: Art. 814223
Synonym: Imidazole
Supplier: Merck KGaA, Germany
Batch: S6746923
Purity (GC) 99.8% (a/a)
Storage: At room temperature
Released until: August 31, 2018

Imidazole was dissolved with 0.9% sodium chloride solution to a concentration of 20% (w/v).

Duration of treatment / exposure:

240 minutes

Number of animals or in vitro replicates:

in vitro: triplicate design

Results and discussion

In vitro

Results

Irritation parameter:

in vitro irritation score

Run / experiment:

Run 1 / Experiment 1

Value:

0.4

Vehicle controls validity:

valid

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

no indication of irritation

Other effects / acceptance of results:

OTHER EFFECTS:
- Visible damage on test system: No observations (e.g. tissue peeling, residual test chemical, non-uniform opacity patterns) were seen in a visually inspection of the corneas after treatment.

ACCEPTANCE OF RESULTS:
- Acceptance criteria met for negative control: After treatment with the negative control (0.9% sodium chloride solution) the calculated IVIS was 0.6 and, thus, within three standard deviations of the current historical mean of the negative control (IVIS: -1.4 – 3.3).
- Acceptance criteria met for positive control: After treatment with the positive control (20% Imidazole) the calculated IVIS was 98.8 and, thus, also within two standard deviations of the current historical mean of the positive control (IVIS 80.1 – 133.1). Therefore, the study fulfilled the validity criteria.

Any other information on results incl. tables

		Opacity	Permeability	IVIS
				per cornea	per group (mean value)	SD
Negative control	0.9% NaCl Solution	-0.2	0.000	-0.200	0.6	0.8
		0.5	-0.001	0.485
		1.5	-0.001	1.485
Positive control	20% Imidazole solution	73.7	2.079	104.885	117.1	11.4
		96.3	2.079	127.485
		82.2	2.410	118.950
Test item	Test item	-0.7	0.002	-0.670	0.4	1.1
		0.2	0.007	-0.305
		0.9	0.047	1.605

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

Under the conditions of the present study, the test item did not show an eye hazard potential. The test item is not requiring classification for eye irritation or serious eye damage (UN GHS: No Category).

Executive summary:

Objective

The objective of the present study was to examine the potential of the test item to induce serious eye damage in the BCOP assay. The BCOP assay with isolated fresh bovine corneas is an accepted in vitro model for ocular hazard assessment.

 

Study Design

To determine the eye hazard potential the induced opacity and increased permeability was investigated in isolated bovine corneas after exposure to the test item as a 20% (w/v) suspension in a 0.9% sodium chloride solution. As negative control 0.9% sodium chloride solution and as positive control 20% (w/v) Imidazole was used.

Three corneas were used per group (negative control, positive control or test item group).

After a first opacity measurement of the untreated bovine corneas, 750 µL of the suspended test item, positive or negative control were applied on the corneas and incubated for 240 minutes. After the incubation phase the test item, the positive, and the negative control were rinsed from the corneas and the opacity was measured again.

After the opacity measurements, the permeability of the corneas was determined by application of a fluorescein solution for 90 minutes. The amount of fluorescein solution that crossed the cornea was measured spectrophotometrically. The opacity and permeability assessments were combined to determine an In Vitro Irritancy Score (IVIS).

 

Results

After treatment with the negative control (0.9% sodium chloride solution) the calculated IVIS was 0.6 (study acceptance criteria range: -1.4 – 3.3). Treatment with the positive control (20% Imidazole) revealed an IVIS of 117.1 (study acceptance criteria range: 80.1 – 133.1).

 

Therefore, the study fulfilled the acceptance criteria.The IVIS obtained after treatment with the test item was 0.4 and, thus, lower than 3,i.e.according to OECD 437 the test item is not requiring classification for eye irritation or serious eye damage (UN GHS: No Category).

 

Conclusion

Under the conditions of the present study, the test item did not show an eye hazard potential. The test item is not requiring classification for eye irritation or serious eye damage (UN GHS: No Category).