1,4-Dihydroxy-2,2,6,6-tetramethylpiperidine

Eye irritation

Administrative data

Endpoint:

eye irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

Study conducted to GLP and in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not effect the quality of the relevant results.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2000

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

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

-

EC Number:

434-880-6

EC Name:

-

Cas Number:

3637-10-3

Molecular formula:

C9H19NO2

IUPAC Name:

2,2,6,6-tetramethylpiperidine-1,4-diol

Test material form:

solid: crystalline

Test animals / tissue source

Species:

rabbit

Strain:

New Zealand White

Details on test animals or tissues and environmental conditions:

TEST ANIMALS
- Source: Three New Zealand White rabbits were supplied by David Percival ltd, Moston, Sandbach, Cheshire, UK.
- Age at study initiation: twelve to sixteen weeks old
- Weight at study initiation: At the start of the study the animals weighed 2.52 to 2.88 kg
- Housing: The animals were individually housed in suspended cages.
- Diet (e.g. ad libitum): Free access to food (Stanrab SQC Rabbit diet supplied by Special Diets Services Ltd, Witham, Essex, UK) was allowed throughout the study.
- Water (e.g. ad libitum): Free access to mains drinking water was allowed throughout the study.
- Acclimation period: At least five days.

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 17 to 23°C
- Humidity (%): 30 to 70%
Any occasional deviations from these targets were considered not to have affected the purpose or integrity of the study.
- Air changes (per hr): At least fifteen changes per hour
- Photoperiod (hrs dark / hrs light): Lighting was controlled by a time switch to give twelve hours continuous light and twelve hours darkness.

Test system

Vehicle:

unchanged (no vehicle)

Remarks:

Test material ground to a powder

Controls:

yes, concurrent no treatment

Amount / concentration applied:

The test material was ground to a powder before use. A volume of 0.1ml weighing approximately 60mg (as measured by gently compacting the required volume into an adapted syringe) was placed into the conjunctival sac of the right eye.

Duration of treatment / exposure:

SIngle application without irrigation

Observation period (in vivo):

72 hours

Number of animals or in vitro replicates:

3

Details on study design:

PROCEDURE:
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. Animals showing evidence of ocular lesions were rejected and replaced

Initially, a single rabbit was treated. A volume of 0.1 ml of the test item, which was found to weigh approximately 60 mg (as measured by gently compacting the required volume into an adapted syringe) 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.

After consideration of the ocular responses produced in the first treated animal, two additional animals were treated.


SCORING SYSTEM:
Assessment of ocular damage/irritation was made approximately 1 hour and 24, 48 and 72 hours following treatment, according to the numerical evaluation from Draize J H 1977 " Dermal and Eye Toxicity Tests" In Priciples and Procedures for Evaluating the Toxicity of Household Substances, National Academy of Sciences, Washington DC p48 to 49. See attached background information

Any other ocular effects were also noted.

TOOL USED TO ASSESS SCORE: Examination of the eye was facilitated by the use of the light source from a standard ophthalmoscope.

Other:
Individual bodyweights were recorded on the Day of treatment.

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

cornea opacity score

Basis:

mean

Remarks:

animal #1 (201)

Time point:

24/48/72 h

Score:

0

Max. score:

4

Results 2

Irritation parameter:

iris score

Basis:

mean

Remarks:

animal #1 (201)

Time point:

24/48/72 h

Score:

0

Max. score:

2

Results 3

Irritation parameter:

conjunctivae score

Remarks:

(redness)

Basis:

mean

Remarks:

animal #1 (201)

Time point:

24/48/72 h

Score:

0.3

Max. score:

3

Reversibility:

fully reversible within: 48 hours

Results 4

Irritation parameter:

chemosis score

Basis:

mean

Remarks:

animal #1 (201)

Time point:

24/48/72 h

Score:

0.3

Max. score:

4

Reversibility:

fully reversible within: 48 hours

Results 5

Irritation parameter:

cornea opacity score

Basis:

mean

Remarks:

animal #2 (205)

Time point:

24/48/72 h

Score:

0

Max. score:

4

Results 6

Irritation parameter:

iris score

Basis:

mean

Remarks:

animal #2 (205)

Time point:

24/48/72 h

Score:

0

Max. score:

2

Results 7

Irritation parameter:

conjunctivae score

Remarks:

(redness)

Basis:

mean

Remarks:

animal #2 (205)

Time point:

24/48/72 h

Score:

0.3

Max. score:

3

Reversibility:

fully reversible within: 48 hours

Results 8

Irritation parameter:

chemosis score

Basis:

mean

Remarks:

animal #2 (205)

Time point:

24/48/72 h

Score:

0

Max. score:

4

Reversibility:

fully reversible within: 48 hours

Results 9

Irritation parameter:

cornea opacity score

Basis:

mean

Remarks:

animal #3 (210)

Time point:

24/48/72 h

Score:

0

Max. score:

4

Results 10

Irritation parameter:

iris score

Basis:

mean

Remarks:

animal #3 (210)

Time point:

24/48/72 h

Score:

0

Max. score:

2

Results 11

Irritation parameter:

conjunctivae score

Remarks:

(redness)

Basis:

mean

Remarks:

animal #3 (210)

Time point:

24/48/72 h

Score:

0.3

Max. score:

3

Reversibility:

fully reversible within: 48 hours

Results 12

Irritation parameter:

chemosis score

Basis:

mean

Remarks:

animal #3 (210)

Time point:

24/48/72 h

Score:

0.3

Max. score:

4

Reversibility:

fully reversible within: 48 hours

Irritant / corrosive response data:

Ocular Reactions:
Individual and group mean scores for ocular irritation are given in the attached background information.

No corneal or iridial effects were noted during the study.

Moderate conjunctival irritation was noted in all treated eyes one hour after treatment with minimal conjunctival irritation noted in all treated eyes at the 24 hour observations.

All treated eyes appeared normal at the 48-Hour observation.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

A single application of the test item to the non-irrigated eye of three rabbits produced moderate conjunctival irritation. All treated eyes appeared normal at the 48 Hour observation.
The test item does not meet the criteria for classification according to the Classification, Labelling and Packaging Regulation or the Globally Harmonised Classification System.

Executive summary:

Introduction. 

The study was performed to assess the irritancy potential of the test item to the eye of the New Zealand White rabbit. The method was designed to be compatible with the following:

- OECD Guidelines for the Testing of Chemicals No. 405 “Acute Eye Irritation/Corrosion” (adopted 24 February 1987)

- Method B5 Acute Toxicity (Eye Irritation) of Commission Directive 92/69/EEC

Result. 

A single application of the test item to the non-irrigated eye of three rabbits produced moderate conjunctival irritation. All treated eyes appeared normal at the 48‑Hour observation.

Conclusion. 

The test item does not meet the criteria for classification according to the Classification, Labelling and Packaging Regulation (CLP) or the Globally Harmonised Classification System.