4-Ethyl-2’-fluoro-4’-bromobiphenyl

Eye irritation

Administrative data

Endpoint:

eye irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Apr 26 - Aug 21, 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2019

Report date:

2019

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

other: OCD 437

Version / remarks:

09 October 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:

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-bromo-4'-ethyl-2-fluoro-1,1'-biphenyl

EC Number:

812-029-3

Cas Number:

116713-40-7

Molecular formula:

C14H12BrF

IUPAC Name:

4-bromo-4'-ethyl-2-fluoro-1,1'-biphenyl

Specific details on test material used for the study:

PREPARATION OF THE TEST MATERIAL
The test item was prepared as a 20% (w/v) suspension in a 0.9% sodium chloride solution. The stability in the vehicle was not investigated. The test item preparation was administered within <1 hour after preparation.

Test system

Vehicle:

physiological saline

Controls:

yes, concurrent vehicle

yes, concurrent positive control

Amount / concentration applied:

Preparation

The test item was prepared as a 20% (w/v) solution in a 0.9% sodium chloride solution. The stability in the vehicle was not investigated. The test item preparation was administered within <1 hour after preparation.

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: 118163013
Storage: 2 to 8°C
Released until: Mar 2021

POSITIVE CONTROL: 750 µL

Designation: Art. 814223
Synonym: Imidazole
Supplier: Merck KGaA, Germany
Batch: S5798623
Content (GC) 99.8% (a/a)
Storage: At room temperature
Released until: April 30, 2023


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

Vehicle controls validity:

valid

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

no indication of irritation

Other effects / acceptance of results:

ACCEPTANCE OF RESULTS:
After treatment with the negative control (0.9% sodium chloride solution) the calculated IVIS was 1.7 and, thus, within three standard deviations of the current historical mean of the negative control (IVIS: -1.4 – 3.0). After treatment with the positive control (20% Imidazole) the calculated IVIS was 107.9 and, thus, also within two standard deviations of the current historical mean of the positive control (IVIS: 83.3 – 132.0). Therefore, the study fulfilled the acceptance criteria.
The resulting classification of the test item in this study is unequivocal and no borderline results were obtained. Therefore, a single testing run composed of three corneas per group was considered sufficient.

Any other information on results incl. tables

		Opacity	Permeability	IVIS
				per cornea	per group (mean value)	Standard deviation
Negative Control	0.9 % sodium chloride solution	0.4	0.003	0.445	1.7	1.2
		2.0	0.002	2.030
		2.7	0.000	2.700
Positive Control	Imidazole (20 %)	73.0	1.429	94.435	107.9	12.5
		69.0	2.745	110.175
		71.4	3.182	119.130
Test Item	-	1.6	0.003	1.645	0.0	1.5
		-1.2	-0.001	-1.215
		-0.6	0.002	-0.570

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

Under the conditions of the present study, 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:

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.

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) solution 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 dissolved 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).

After treatment with the negative control (0.9% sodium chloride solution) the calculated IVIS was 1.7 (study acceptance criteria range: -1.4 – 3.0). Treatment with the positive control (20% Imidazole) revealed an IVIS of 107.9 (study acceptance criteria range: 83.3 – 132.0). Therefore, the study fulfilled the acceptance criteria.

The IVIS obtained after treatment with the test material was 0.0 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).

Under the conditions of the present study, 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).