1,4-dioxacycloheptadecane-5,17-dione

Eye irritation

Administrative data

Endpoint:

eye irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Between 2012-10-09 and 2012-10-18

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Study performed according to OECD test guideline No. 405 and in compliance with GLP.

Cross-reference

Cross-reference 1

Reason / purpose for cross-reference:

reference to same study

Cross-reference 2

Reason / purpose for cross-reference:

reference to other study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2013

Report date:

2013

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 405 (Acute Eye Irritation / Corrosion)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.5 (Acute Toxicity: Eye Irritation / Corrosion)

Deviations:

no

Principles of method if other than guideline:

Not applicable

GLP compliance:

yes (incl. QA statement)

Remarks:

UK GLP Compliance Monitoring Programme (inspected on 2012-07-10)

Test material

Test material information

Constituent 1

Reference substance name:

1,4-dioxacycloheptadecane-5,17-dione

EC Number:

203-347-8

EC Name:

1,4-dioxacycloheptadecane-5,17-dione

Cas Number:

105-95-3

Molecular formula:

C15H26O4

IUPAC Name:

1,4-dioxacycloheptadecane-5,17-dione

Test material form:

other: liquid

Details on test material:

- Name of test material (as cited in study report): Ethylene Brassylate
- Physical state: clear colourless viscous liquid
- Storage condition of test material: room temperature in the dark

Test animals / tissue source

Species:

rabbit

Strain:

New Zealand White

Details on test animals or tissues and environmental conditions:

TEST ANIMALS: New Zealand White (Hsdlf:NZW) strain male rabbits.
- Source: Harlan Laboratories UK Ltd., Leicestershire, UK.
- Age at study initiation: twelve to twenty weeks old.
- Weight at study initiation: 2.56 to 3.35 kg bw.
- Housing: individually housed in suspended cages.
- Diet (e.g. ad libitum): free access to food (2930C Teklad Global Certified Rabbit diet supplied by Harlan Laboratories UK Ltd., Oxon, UK)
- Water (e.g. ad libitum): free access to drinking water.
The diet and drinking water were considered not to contain any contaminant of a level that might have affected the purpose or integrity of the study.
- Acclimation period: at least five days.

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 17-23
- Humidity (%): 30-70
- Air changes (per hr): at least 15
- Photoperiod (hrs dark / hrs light): 12/12

Test system

Vehicle:

unchanged (no vehicle)

Controls:

other: the left eye of each rabbit served as control

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 0.1 mL

Duration of treatment / exposure:

The eyes were not rinsed after administration of the test item.

Observation period (in vivo):

approximately 1 hour and 24, 48 and 72 hours following treatment

Number of animals or in vitro replicates:

3

Details on study design:

REMOVAL OF TEST SUBSTANCE
- Washing (if done): The eyes were not rinsed after administration of the test item.

SCORING SYSTEM: Draize J H (1977) "Dermal and Eye Toxicity Tests" In: Principles and Procedures for Evaluating the Toxicity of Household Substances, National Academy of Sciences, Washington DC p.48 to 49.

TOOL USED TO ASSESS SCORE: light source from a standard ophthalmoscope.

OTHER
Any clinical signs of toxicity, if present, were also recorded.
Individual bodyweights were recorded on Day 0 (the day of dosing) and at the end of the observation period.

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

cornea opacity score

Basis:

animal: #1, #2 and #3

Time point:

other: mean 24-48-72h

Score:

0

Max. score:

4

Results 2

Irritation parameter:

iris score

Basis:

animal: #1, #2 and #3

Time point:

other: mean 24-48-72h

Score:

0

Max. score:

2

Results 3

Irritation parameter:

conjunctivae score

Basis:

animal: #1 and #2

Time point:

other: mean 24-48-72h

Score:

0.3

Max. score:

3

Reversibility:

fully reversible within: 48h

Results 4

Irritation parameter:

conjunctivae score

Basis:

animal #3

Time point:

other: mean 24-48-72h

Score:

0.7

Max. score:

3

Reversibility:

fully reversible within: 72h

Results 5

Irritation parameter:

chemosis score

Basis:

animal: #1, #2 and #3

Time point:

other: mean 24-48-72h

Score:

0

Max. score:

4

Irritant / corrosive response data:

No corneal or iridial effects were noted during the study.
Moderate conjunctival irritation (grade 2) was noted in one treated eye with minimal conjunctival irritation (grade 1) noted in two treated eyes one hour after treatment. Minimal conjunctival irritation (grade 1) was noted in all treated eyes at the 24-Hour observation and persisted in one treated eye at the 48-Hour observation.
Two treated eyes appeared normal at the 48-Hour observation and one treated eye appeared normal at the 72-Hour observation, therefore the study was terminated on Day 3 post instillation.

Other effects:

All animals showed expected gain in bodyweight during the study.

Any other information on results incl. tables

Table 7.3.2/1: Irritant/corrosive response data each animals at each observation time up to removal from the test

 

Score at time point / Reversibility	Cornea		Iris (/2)	Conjunctivae
	Opacity (/4)	Area (/4)		Redness (/3)	Chemosis (/4)	Discharge (/3)
1 h	0 / 0 / 0	0 / 0 / 0	0 / 0 / 0	2 / 1 / 1	1 / 1 / 1	1 / 0 / 0
24 h	0 / 0 / 0	0 / 0 / 0	0 / 0 / 0	1 / 1 / 1	0 / 0 / 0	0 / 0 / 0
48 h	0 / 0 / 0	0 / 0 / 0	0 / 0 / 0	0 / 0 / 1	0 / 0 / 0	0 / 0 / 0
72 h	0 / 0 / 0	0 / 0 / 0	0 / 0 / 0	0 / 0 / 0	0 / 0 / 0	0 / 0 / 0
Average 24h, 48h, 72h	0 / 0 / 0	0 / 0 / 0	0 / 0 / 0	0.3 / 0.3 / 0.7	0 / 0 / 0	0 / 0 / 0
Reversibility*)	-	-	-	c.	c.	c.
Average time (unit) for reversion	-	-	-	72 h	24 h	24 h

*) Reversibility: c. = completely reversible; n.c. = not completely reversible; n. = not reversible

 

Applicant's summary and conclusion

Interpretation of results:

not irritating

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

Mean scores calculated for each animal over 24, 48 and 72 hours were 0.0/0.0/0.0 for cornea opacity, 0.0/0.0/0.0 for iris lesions, 0.3/0.3/0.7 for redness of the conjunctivae and 0.0/0.0/0.0 for chemosis.

Executive summary:

In an eye irritation study performed according to the OECD guideline No. 405, and in compliance with GLP, 0.1 mL of undiluted Ethylene Brassylate was instilled initially into the right eye of a single New Zealand White rabbit. After consideration of the ocular responses produced in the first treated animal, two additional animals were treated. The eyes were not rinsed after administration of Ethylene Brassylate. The left eye of each rabbit served as control. Animals were observed 1, 24, 48 and 72 hours after dosing under a light source from a standard ophthalmoscope. The reactions in the conjunctiva (redness, chemosis and discharge), the iris and the cornea (opacity and area involved) were scored according to the Draize scale. 

No ocular irritation was noted in any animal at the 72-Hour observation, therefore no further observations were required and the study was terminated.

No corneal or iridial effects were noted during the study. Moderate conjunctival irritation (grade 2) was noted in one treated eye with minimal conjunctival irritation (grade 1) noted in two treated eyes one hour after treatment. Minimal conjunctival irritation (grade 1) was noted in all treated eyes at the 24-hour observation and persisted in one treated eye at the 48-hour observation. Two treated eyes appeared normal at the 48-hour observation and one treated eye appeared normal at the 72-hour observation, therefore the study was terminated on Day 3 post instillation.

Mean scores calculated for each animal over 24, 48 and 72 hours were 0.0/0.0/0.0 for cornea opacity, 0.0/0.0/0.0 for iris lesions, 0.3/0.3/0.7 for redness of the conjunctivae and 0.0/0.0/0.0 for chemosis.

Under the test conditions, Ethylene Brassylate is not classified as irritating to eyes according to the criteria of the Annex VI of the Regulation (EC) No. 1272/2008 (CLP) and of the Directive 67/548/EEC.

This study is considered as acceptable and satisfies the requirement for eye irritation endpoint.