9-[2-(2-methoxyethoxy)ethoxy]-9-[3-(oxiranylmethoxy)propyl]-2,5,8,10,13,16-hexaoxa-9-silaheptadecane

Eye irritation

Administrative data

Endpoint:

eye irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Thei study was conducted between 26 October 2016 and 04 November 2016

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 405 (Acute Eye Irritation / Corrosion)

Version / remarks:

02 October 2012

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

EC No. 440/2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

9-[2-(2-methoxyethoxy)ethoxy]-9-[3-(oxiranylmethoxy)propyl]-2,5,8,10,13,16-hexaoxa-9-silaheptadecane

EC Number:

289-390-3

EC Name:

9-[2-(2-methoxyethoxy)ethoxy]-9-[3-(oxiranylmethoxy)propyl]-2,5,8,10,13,16-hexaoxa-9-silaheptadecane

Cas Number:

88127-84-8

Molecular formula:

C21H44O11Si

IUPAC Name:

9-[2-(2-methoxyethoxy)ethoxy]-9-{3-[(oxiran-2-yl)methoxy]propyl}-2,5,8,10,13,16-hexaoxa-9-silaheptadecane

Test material form:

liquid

Remarks:

clear colorless

Test animals / tissue source

Species:

rabbit

Strain:

New Zealand White

Remarks:

Hsdlf:NZW

Details on test animals or tissues and environmental conditions:

TEST ANIMALS
- Source: Envigo RMS (UK) Limited, Leicestershire, UK.
- Age at study initiation: 12 - 52 weeks
- Weight at study initiation: 3.72 - 4.07 kg
- Housing: individually housed in suspended cages
- Diet (e.g. ad libitum): ad libitum
- Water (e.g. ad libitum): ad libitum
- Acclimation period: >50 days

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

IN-LIFE DATES: From: 26 October 2016 To: 04 November 2016

Test system

Vehicle:

unchanged (no vehicle)

Controls:

yes

Amount / concentration applied:

0.1 mL test material as supplied

Duration of treatment / exposure:

72 hours

Observation period (in vivo):

72 hours

Number of animals or in vitro replicates:

2

Details on study design:

Immediately before the start of the test, both eyes of the provisionally selected test rabbits were examined for evidence of ocular irritation or defect with the aid of a light source from a standard ophthalmoscope. Only animals free of ocular damage were used.
Initially, a single rabbit was treated. A subcutaneous injection of buprenorphine 0.01 mg/kg was administered 60 minutes prior to test item application to provide a therapeutic level of systemic analgesia. Five minutes prior to test item application, a pre dose anesthesia of ocular anesthetic (two drops of 0.5% proxymetacaine hydrochloride) was applied to each eye.
A volume of 0.1 mL of the test item was placed into the conjunctival sac of the right eye, formed by gently pulling the lower lid away from the eyeball. The upper and lower eyelids were held together for about one second immediately after treatment, to prevent loss of the test item, and then released. The left eye remained untreated and was used for control purposes. Immediately after administration of the test item, an assessment of the initial pain reaction was made according to the six point scale shown in Table 1.
Eight hours after test item application, a subcutaneous injection of post dose analgesia, buprenorphine 0.01 mg/kg and meloxicam 0.5 mg/kg, was administered to provide a continued therapeutic level of systemic analgesia. The treated animal was checked for signs of pain and suffering approximately 12 hours later. No further analgesia was required.
After consideration of the ocular responses produced in the first treated animal, a second animal was similarly treated.
Assessment of ocular damage/irritation was made approximately 1 hour and 24, 48 and 72 hours following treatment, according to the numerical evaluation (Draize, J.H, 1977) given in Table 2.
Any other ocular effects were also noted. Examination of the eye was facilitated by the use of the light source from a standard ophthalmoscope.
Any clinical signs of toxicity, if present, were also recorded.
Individual body weights were recorded on Day 0 (the day of dosing) and at the end of the observation period.

Data Evaluation
The numerical values corresponding to each animal, tissue and observation time were recorded. The data relating to the conjunctivae were designated by the letters A (redness), B (chemosis) and C (discharge), those relating to the iris designated by the letter D and those relating to the cornea by the letters E (degree of opacity) and F (area of cornea involved). For each tissue the score was calculated as follows:
Score for conjunctivae = (A + B + C) x 2
Score for iris = D x 5
Score for cornea = (E x F) x 5

Using the numerical data obtained a modified version of the system described by Kay J.H. and Calandra J.C. (1962) was used to classify the ocular irritancy potential of the test item. This was achieved by adding together the scores for the cornea, iris and conjunctivae for each time point for each rabbit. The group means of the total scores for each observation were calculated. The highest of these group means (the maximum group mean score) together with the persistence of the reactions enabled classification of the eye irritancy potential of the test item.
If evidence of irreversible ocular damage is noted, the test item will be classified as corrosive to the eye.
The results were also evaluated according to the Globally Harmonized System of Classification and Labelling of Chemicals.

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

cornea opacity score

Basis:

mean

Time point:

24/48/72 h

Score:

0

Max. score:

0

Reversibility:

not specified

Remarks on result:

no indication of irritation

Results 2

Irritation parameter:

iris score

Basis:

mean

Time point:

24/48/72 h

Score:

0

Max. score:

0

Reversibility:

not specified

Remarks on result:

no indication of irritation

Results 3

Irritation parameter:

conjunctivae score

Basis:

mean

Time point:

72 h

Score:

0

Max. score:

8

Reversibility:

not specified

Remarks on result:

no indication of irritation

Results 4

Irritation parameter:

overall irritation score

Basis:

mean

Time point:

72 h

Score:

0

Max. score:

2

Reversibility:

not specified

Remarks on result:

no indication of irritation

Other effects:

None

Any other information on results incl. tables

Ocular Reactions

Individual and group mean scores for ocular irritation are given in Table 3.  

No corneal or iridial effects were noted during the study.

Moderate conjunctival irritation was noted in one treated eye with minimal conjunctival irritation noted in the other treated eye 1 hour after treatment.  Minimal conjunctival irritation was noted in both treated eyes at the 24 Hour observation and persisted in one treated eye at the 48 Hour observation.

One treated eye appeared normal at the 48 Hour observation and the other treated eye appeared normal at the 72 Hour observation.

Body Weight

One animal showed body weight loss and the other animal showed expected gain in body weight during the study.

Table 3: Individual Total Scores and Group Mean Scores for Ocular Irritation

Rabbir Number and sex	Individual Total Scores at:
	1 hour	24 hours	48 hours	72 hours
75610 Female	8	6	4	2
75630 Female	6	4	0	0
Group Total	14	10	4	0
Group Mean Score	7.0	5.0	2.0	0..0

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

The test item produced a maximum group mean score of 7.0 and was classified as a mild irritant (Class 4 on a 1 to 8 scale) to the rabbit eye according to a modified Kay and Calandra classification system.
The test item does not meet the criteria for classification according to the Globally Harmonized System of Classification and Labelling of Chemicals

Executive summary:

The study was performed to assess the irritancy potential of the test item to the eye of the New Zealand White rabbit.

Results

A single application of the test item to the non-irrigated eye of two rabbits produced minimal to moderate conjunctival irritation.  One treated eye appeared normal at the 48 Hour observation and the other treated eye appeared normal at the 72 Hour observation.

Conclusion

The test item produced a maximum group mean score of 7.0 and was classified as a mild irritant (Class 4 on a 1 to 8 scale) to the rabbit eye according to a modified Kay and Calandra classification system.

The test item does not meet the criteria for classification according to the Globally Harmonized System of Classification and Labelling of Chemicals.