Sodium toluene-4-sulphinate

Eye irritation

Administrative data

Endpoint:

eye irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Aug 16 - Oct 19, 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

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:

Sodium toluene-4-sulphinate

EC Number:

212-538-5

EC Name:

Sodium toluene-4-sulphinate

Cas Number:

824-79-3

Molecular formula:

C7H8O2S.Na

IUPAC Name:

sodium toluene-4-sulphinate

Test material form:

solid

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: 17361013
Storage: 2 to 8°C
Released until: August 2020

POSITIVE CONTROL: 750 µL

Designation: Art. 814223
Synonym: Imidazole
Supplier: Merck KGaA, Germany
Batch: S5798623
Purity (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:

7.5

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 0.5 and, thus, within three standard deviations of the current historical mean of the negative control (IVIS: -1.4 – 3.1). After treatment with the positive control (20% Imidazole) the calculated IVIS was 99.6 and, thus, also within two standard deviations of the current historical mean of the positive control (IVIS: 82.3 – 132.6). 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)	SD
Negative control	0.9% NaCl Solution	-0.5	0.002	-0.470	0.5	0.9
		0.7	0.004	0.760
		1.2	0.003	1.245
Positive control	20% Imidazole solution	62.6	2.727	96.680	99.6	4.5
		59.2	2.536	97.240
		67.0	2.516	104.740
Test item	Test Item	5.3	0.060	6.200	7.5	2.3
		8.7	0.103	10.245
		6.0	0.013	6.195

Applicant's summary and conclusion

Interpretation of results:

other: inconclusive

Conclusions:

Under the conditions of the present study, the eye hazard potential of the test item cannot be predicted.

Executive summary:

This study was performed according to GLP and the methods applied are fully compliant with OECD TG 437. Under the conditions of the present study, the eye hazard potential of the test item cannot be predicted.