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Toxicological information

Eye irritation

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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
Justification for type of information:
Data is from experimental study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2014
Report Date:
2014

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 405 (Acute Eye Irritation / Corrosion)
Principles of method if other than guideline:
The objective of the study was to assess the irritant and/or corrosive effects of test chemical on eye, when exposed by the ocular route in rabbits.
GLP compliance:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report):N-tert-butylacrylamide
- Molecular formula:C7H13NO
- Molecular weight :127.18 g/mol
- Substance type:organic
- Physical state:White Solid
- Lot/batch No.:Lot 1/08
- AI Content:99.41 %
- Storage condition of test material:The test item was kept in refrigerated (below 4 ˚C) and in tight container closed in a dry and well- ventilated place.
- Other:
Handling and Disposal
Safety precautions : Aprons, masks, caps, gloves and goggles were used to ensure the health and safety of the personnel.
Disposal : No test item was disposed during the conduct of the study.

Test animals / tissue source

Species:
rabbit
Strain:
New Zealand White
Details on test animals or tissues and environmental conditions:
TEST ANIMALS
- Source:Procured from RABBI ROOF, Hyderabad.
- Age at study initiation:4.5 to 5.5 Months (Approximately)
- Weight at study initiation:Minimum: 2.036 kg and Maximum: 2.408 kg (Prior to Treatment)
- Health Status :Healthy young adult, Females were nulliparous and non pregnant.
- Housing:The animals were housed individually in stainless steel cages.
- Room Sanitation:The experimental room floor and work tops were swept and mopped with disinfectant solution every day.
- Cages and water bottle:All the cages and water bottles were changed minimum twice a week.
- Diet (e.g. ad libitum):All animals were provided conventional laboratory rabbit diet (Nutrivet Life Sciences, Pune) ad libitum.
- Water (e.g. ad libitum):Aqua guard filtered tap water was provided ad libitum.
- Acclimation period:Rabbits were acclimatised to the test conditions for a period of 6 days (Animal No.-1) and 9 days (Animal No. 2 and 3) prior to the application of the test item.

ENVIRONMENTAL CONDITIONS
- Temperature (°C):Minimum: 19.50 °C and Maximum: 22.20 °C
- Humidity (%)::Minimum: 41.20 % and Maximum: 59.20 %
- Air changes (per hr): More than 12 changes per hour
- Photoperiod (hrs dark / hrs light):: 12:12

Test system

Vehicle:
unchanged (no vehicle)
Controls:
yes
Amount / concentration applied:
TEST MATERIAL
- Amount(s) applied (volume or weight with unit):100 mg
- Concentration (if solution):N/A

VEHICLE
- Amount(s) applied (volume or weight with unit):N/A
- Concentration (if solution):N/A
- Lot/batch no. (if required):N/A
- Purity:N/A
Duration of treatment / exposure:
24 hrs
Observation period (in vivo):
All the animals were observed at 1, 24, 48 and 72 hours after instillation of test item.
Number of animals or in vitro replicates:
3 female rabbits
Details on study design:
REMOVAL OF TEST SUBSTANCE
- Washing (if done):The treated eye of rabbit was washed with normal saline.
- Time after start of exposure:24 hours

SCORING SYSTEM:Draize Method

TOOL USED TO ASSESS SCORE: Ophthalmoscope and fluorescein strips.

Results and discussion

In vivo

Resultsopen allclose all
Irritation parameter:
cornea opacity score
Basis:
animal: #1,#2 and #3
Time point:
other: After 24, 48, 72 Hours
Score:
0
Max. score:
4
Reversibility:
not specified
Remarks on result:
no indication of irritation
Remarks:
For treated eye
Irritation parameter:
iris score
Basis:
animal: #1,#2 and #3
Time point:
other: After 24, 48, 72 Hours
Score:
0
Max. score:
2
Reversibility:
not specified
Remarks on result:
no indication of irritation
Remarks:
For treated eye
Irritation parameter:
conjunctivae score
Basis:
animal: #1 and #2
Time point:
other: After 24, 48, 72 Hours
Score:
0
Max. score:
3
Reversibility:
not specified
Remarks on result:
no indication of irritation
Remarks:
For treated eye
Irritation parameter:
conjunctivae score
Basis:
animal #3
Time point:
24/48/72 h
Score:
0.33
Max. score:
3
Reversibility:
fully reversible
Remarks on result:
no indication of irritation
Remarks:
treated group
Irritation parameter:
chemosis score
Basis:
animal: #1,#2 and #3
Time point:
other: After 24, 48, 72 Hours
Score:
0
Max. score:
4
Reversibility:
not specified
Remarks on result:
no indication of irritation
Remarks:
For treated eye
Irritant / corrosive response data:
The following were observed in treated rabbits.
Observation at 1 hour after instillation of test item revealed: Cornea- No ulceration or opacity in all 3 animals; Area of Opacity- Zero in all the animals; Iris: Normal in all the animals. Conjunctivae - Diffuse, crimson color; individual vessels not easily discernible in animal no. 1 and some blood vessels definitely hyperaemic (injected) animal no. 2 whereas in animal no. 3 blood vessels were normal; Chemosis: Some swelling above normal (includes nictitating membranes) in animal no. 1 whereas no swelling was observed in animal no. 2 and 3.

Observation at 24 hours after instillation of test item revealed: Cornea- No ulceration or opacity in all 3 animals; Area of Opacity- Zero in all the animals; Iris: Normal in all the animals. Conjunctivae - Some blood vessels definitely hyperaemic (injected) was observed in animal no.3 and normal in Animal Numbers 1 and 2; Chemosis: No swelling was observed in all the 3 animals.

At 24 hours observation the rabbits were examined for corneal epithelium cell damage using sodium fluorescein strips and noticed 0 % damage in animal no. 1, 2 and 3.

Observation at 48 and 72 hours after instillation of test item revealed: Cornea- No ulceration or opacity in all the animals; Area of Opacity- Zero in all the animals; Iris: Normal in all the animals. Conjunctivae – Blood vessels were normal in all the animals; Chemosis: No swelling was observed in all the animals.
The individual mean score for animal nos. 1, 2 and 3 at 24, 48, 72 hours for Corneal opacity, iris, conjunctiva and chemosis were found 0.00, 0.00, 0.00, 0.00; 0.00, 0.00, 0.00, 0.00; and 0.00, 0.00, 0.33, 0.00, respectively.
Other effects:
Clinical Observation
No systemic toxicity was observed in treated rabbits during the experimental period.

Mortality
No mortality was observed during the observation period.

Body weight
All rabbits were weighed on test day 0 (prior to application) and at termination.

Any other information on results incl. tables

Table 1 : Individual Animal Eye Irritation Scores

 

In Treated area Dose:100 mg (0.1 gm) of test item                                          Sex:Female

Animal Numbers

1

2

3

Application Side

Right

Right

Right

Eye Reactions

At hour

At hour

At hour

*

1

24

48

72

*

1

24

48

72

*

1

24

48

72

Corneal Opacity

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Area of Opacity

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Iris

0

2

0

0

0

0

0

0

0

0

0

0

0

0

0

Conjunctiva

0

1

0

0

0

0

1

0

0

0

0

0

1

0

0

Chemosis

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Corneal Damage%

0

0

0

 

 

Dose:Untreated (Control Eye)                                                                       Sex:Female

Animal Numbers

1

2

3

Application Side

Left

Left

Left

Eye Reactions

At hour

At hour

At hour

*

1

24

48

72

*

1

 24

48

72

*

1

24

48

72

Corneal Opacity

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Area of Opacity

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Iris

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Conjunctiva

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Chemosis

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Corneal Damage%

0

0

0

Key:*= Pre-exposure eye examination.

 

Table 1 Continued…

 

Eye Irritation Scores - Mean Values after 24, 48, 72 Hours (Treated eye)

            Animal No.

 Eye Reaction

1

2

3

Corneal Opacity

0.00

0.00

0.00

Iris

0.00

0.00

0.00

Conjunctiva

0.00

0.00

0.33

Chemosis

0.00

0.00

0.00

 

 

Formula :

 

Mean Eye Irritation Score =  

Sum of the Individual Animal Score for eye reactionat24, 48 and 72 hours

Number of the Observations (3)

 

 

Table 2 : Individual AnimalClinicalSigns

 

Sex:Female

Animal No.

Days (Post application observation)

0

1

2

3

1

1

1

1

1

2

1

1

1

1

3

1

1

1

1

Key:1 = Normal

  

Table 3: Individual Animal Body Weight

 

Sex :Female

Animal No.

Animal Body Weight (kg)

Prior to application

At termination

1

2.340

2.432

2

2.408

2.508

3

2.036

2.048

Key:kg = Kilogram

Applicant's summary and conclusion

Interpretation of results:
other: not irritating
Conclusions:
Under the experimental conditions tested, eye irritation and reversibility of effects on eyes of rabbits was observed within 72 hours.
Hence, the test chemical is “Non Irritant” to New Zealand White Female rabbit eyes and is being classified as “Not Classified” as per the CLP Regulation.
Executive summary:

Acute eye irritation/corrosion study was conducted in rabbits to evaluate the eye irritant nature of the test chemical. The study was performed as per OECD 405 Guidelines using 3 female New Zealand White rabbits.

 

Rabbits free from injury of eye were selected for the study. The eyes of all the rabbits were examined 24 hours prior to treatment. One eye of each rabbit served as control and other as treated. Control eye was left untreated whereas; 100 mg of test item was instilled in the other (treated) eye of each rabbit.The eye was observed at 1, 24, 48 and 72 hour after test item instillation.Ophthalmoscope was used for scoring of eye lesions.

In the initial test,100 mg of test item (Pulverized Form) was applied into the conjunctival sac of the right eye of animal no.1 whereas the left eye of the rabbit served as the control. Ocular lesions were seen in animal no.1 at 1 hour observation which recovered at 24 hour hence a confirmatory test was conducted on additional two rabbits (animal no. 2 and 3); 100 mg of test item was instilled into the conjunctival sac of right eye of both the rabbits and left eye served as the control. Ocular lesions were seen in animal no. 2 at 1 hour observation which was recover at 24 hour and in animal no.3 at 24 hour which was recover at 48 hour observation.

 

Untreated eye of all the three rabbits was normal throughout the experimental period of 72 hours.

 

The following grading scores were observed in treated eye of tested rabbits.

Observation at 1 hour after instillation of test item revealed: Cornea-No ulceration or opacity in all 3 animals; Area of Opacity-Zero in all the animals;Iris:Normal in all the animals.Conjunctivae -Diffuse, crimson color; individual vessels not easily discerniblein animal no. 1 and some blood vessels definitely hyperaemic (injected) animal no. 2 whereas in animal no. 3 blood vessels were normal;Chemosis:Some swelling above normal (includes nictitating membranes) in animal no. 1 whereas no swelling was observed in animal no. 2 and 3.

 

Observation at 24 hours after instillation of test item revealed: Cornea-No ulceration or opacity in all 3 animals; Area of Opacity-Zero in all the animals;Iris:Normal in all the animals.Conjunctivae -Some blood vessels definitely hyperaemic (injected) was observed in animal no.3 and normal in Animal Numbers 1 and 2;Chemosis:No swelling was observed in all the 3 animals

 

At 24 hours observation the rabbits were examined for corneal epithelium cell damage using sodium fluorescein strips and noticed 0 % damage in animal no. 1, 2 and 3.

 

Observation at 48 and 72 hours after instillation of test item revealed: Cornea-No ulceration or opacity in all the animals; Area of Opacity-Zero in all the animals;Iris:Normal in all the animals.Conjunctivae -Blood vessels were normal in all the animals;Chemosis:No swelling was observed in all the animals.

 

The individual mean score for animal nos. 1, 2 and 3at 24, 48, 72 hoursfor Corneal opacity, iris, conjunctiva and chemosis were found 0.00, 0.00, 0.00, 0.00; 0.00, 0.00, 0.00, 0.00; and 0.00, 0.00, 0.33, 0.00, respectively.

Under the experimental conditions tested, eye irritation and reversibility of effects on eyes of rabbit no. 1 and 2 was observed at 24 hours and rabbit no. 3 at 48 hours. Hence, the test chemical is considered as Non-Irritating to the eyes of female New Zealand White rabbits under the experimental conditions tested and Classified as “Category- Not Classified” as per CLP Regulation.