Dodecan-5-olide

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

Justification for type of information:

Data is from experimental study report

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2014

Report date:

2014

Materials and methods

Test guideline

Qualifier:

according to guideline

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 an ocular route in rabbits.

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Dodecan-5-olide

EC Number:

211-932-4

EC Name:

Dodecan-5-olide

Cas Number:

713-95-1

Molecular formula:

C12H22O2

IUPAC Name:

6-heptyloxan-2-one

Test material form:

liquid

Details on test material:

- Name of the test material : Dodecan 5- olide
- Molecular formula : C12H22O2
- Molecular weight : 198.31 g/mol
- Substance type : Organic
- Physical state : Liquid

Test animals / tissue source

Species:

rabbit

Strain:

New Zealand White

Details on test animals or tissues and environmental conditions:

Species : Rabbit (Oryctolagus cuniculus)
Strain : New Zealand White
Age : 2.5 to 3.5 Months (Approximately)
Sex : Male
Number of Animals: Three
Supplier/Source: Procured from Sainath Agencies, Hyderabad, India (CPCSEA Reg. No. 282/24-11-2000).
Health Status : Healthy young adult animals were used
Body weight of animals : Minimum: 1.683 kg and Maximum: 1.796 kg (Prior to Treatment)
Acclimatisation: Rabbits were acclimatised to the test conditions for a period of 7 days (Animal No.-1) and 10 days (Animal No. 2 and 3) prior to the application of the test item.
Identification : During acclimatization marking was done with non toxic marker pen in the inside of left ear of rabbits and after acclimatization, animals were marked with permanent number in the inner side of right ear of rabbits. Permanent marker and cage card was used for identification. The individual cage card was labelled with at least study no., study type, test system, sex, dose, experiment start date and experiment completion date..

Husbandry Conditions
Diet: All animals were provided conventional laboratory rabbit diet (Nutrivet Life Sciences, Pune) ad libitum. Batch No.: 200005.
Water : Aqua guard filtered tap water was provided ad libitum.
Husbandry: 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.

Experimental Room Condition
Temperature : Minimum: 19.60°C, Maximum: 22.20 °C
Relative humidity: Minimum: 56.50 % Maximum: 69.20%
Light-dark-rhythm: 12:12
Air Changes: More than 12 changes per hour

Test system

Vehicle:

unchanged (no vehicle)

Controls:

yes, concurrent no treatment

Amount / concentration applied:

0.1 ml test item (as such) was placed in the conjunctival sac of three rabbits

Duration of treatment / exposure:

24 hours

Observation period (in vivo):

at 1, 24, 48 and 72 hours after instillation of test item.

Number of animals or in vitro replicates:

three male 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 hrs

SCORING SYSTEM: Grading of irritation lesions was carried out as per Draize Method

TOOL USED TO ASSESS SCORE: Ophthalmoscope and fluorescein strips.

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:

4

Reversibility:

other: Not applicable

Remarks on result:

no indication of irritation

Results 2

Irritation parameter:

conjunctivae score

Basis:

mean

Time point:

24/48/72 h

Score:

0

Max. score:

2

Reversibility:

other: Not applicable

Remarks on result:

no indication of irritation

Results 3

Irritation parameter:

iris score

Basis:

mean

Time point:

24/48/72 h

Score:

0

Max. score:

4

Reversibility:

other: Not applicable

Remarks on result:

no indication of irritation

Results 4

Irritation parameter:

chemosis score

Basis:

mean

Time point:

24/48/72 h

Score:

0

Max. score:

3

Reversibility:

other: Not applicable

Remarks on result:

no indication of irritation

Irritant / corrosive response data:

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 the 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 all the animals;
Chemosis: No swelling above normal (includes nictitating membranes) was seen in all the animals.

Observation at 24 hour 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 was normal in all the animals;
Chemosis: No swelling (normal) was seen in all the 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 hour 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 was normal in all the animals;
Chemosis: No swelling (normal) was seen in all the animals.

Observation at 72 hour 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 normal was observed in all the animals;
Chemosis:No swelling (normal) was seen 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, 0.00, 0.00, respectively.

Any other information on results incl. tables

Table 1 : Individual Animal Eye Irritation Scores

 

In Treated area Dose: 0.1 ml of test item (as such)                                               Sex: Male

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	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Conjunctiva	0	1	1	1	0	0	1	1	1	0	0	1	1	1	0
Chemosis	0	1	0	0	0	0	1	0	0	0	0	1	0	0	0
Corneal Damage%	0%					0%					0%

 

 

Dose:Untreated (Control Eye)                                                                       Sex: Male

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	0.00
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:Male

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 : Male

Animal No.	Animal Body Weight (kg)
	Prior to application	At termination
1	1.796	1.862
2	1.778	1.860
3	1.638	1.778

Key: kg = Kilogram

Applicant's summary and conclusion

Interpretation of results:

other: not irritating

Conclusions:

The individual mean score for animal nos. 1, 2 and 3 at 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, 0.00, 0.00, respectively.
 
Under the experimental conditions tested, no eye irritation on eyes of rabbits was observed at 72 hours. Hence, the test chemical was considered as “Non Irritant” to New Zealand White male rabbit eyes and being classified as “Not Classified as an Eye Irritant” as per the criteria of 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 three male 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; 0.1 ml of test item was instilled in the other (treated) eye of each rabbit. The eye was observed at 1, 24, 48 and 72 hours after test item instillation. Ophthalmoscope was used for scoring of eye lesions.

 

In the initial test, 0.1 ml of test item 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. As animal no. 1 showed no severe ocular lesions till 24 hour observation hence a confirmatory test was conducted on additional two rabbits (animal no. 2 and 3); 0.1 ml 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 and 3 which were recovered till 72 hours 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 24 hour 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 was normal in all the animals; Chemosis: No swelling (normal) was seen in all the 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 hour 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 was normal in all the animals; Chemosis: No swelling (normal) was seen in all the animals.

 

Observation at 72 hour 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 normal was observed in all the animals; Chemosis:No swelling (normal) was seen 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, 0.00, 0.00, respectively.

 

Under the experimental conditions tested, no eye irritation on eyes of rabbits was observed at 72 hours. Hence, the test chemical was considered as “Non Irritant” to New Zealand White male rabbit eyes and being classified as “Not Classified as an Eye Irritant” as per the criteria of CLP regulation.