calcium (1R,2S)-cyclohexane-1,2-dicarboxylate

Eye irritation

Administrative data

Endpoint:

eye irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

13 February 2006 to 23 February 2006

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

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

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2006

Report date:

2006

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

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

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 405 (Acute Eye Irritation / Corrosion)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Details on test material:

Nature of substance: powder

Test animals / tissue source

Species:

rabbit

Strain:

New Zealand White

Details on test animals or tissues and environmental conditions:

TEST ANIMALS
- Source: David Percival Ltd., Moston, Sandbach, Cheshire, UK
- Age at study initiation: 12 - 20 weeks
- Weight at study initiation: 2.0 - 3.5 kg
- Housing: individually housed in suspended cages
- Diet (e.g. ad libitum): ad libitum
- Water (e.g. ad libitum): ad libitum
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. The animals were provided with environmental enrichment items which 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 5 days


ENVIRONMENTAL CONDITIONS
- Temperature (°C): 17 - 23 °C
- Humidity (%): 30 - 70 %
Any occasional deviations from the above targets were considered not to have affected the purpose or integrity of the study.
- Air changes (per hr): at least 15 changes per hour
- Photoperiod (hrs dark / hrs light): 12 hours dark / 12 hours light


IN-LIFE DATES: From: 13 February 2006 To: 23 February 2006

Test system

Vehicle:

unchanged (no vehicle)

Controls:

no

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 0.1 ml (found to weigh approximately 23 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:

The test substance was instilled in the conjunctival sac of the right eye of each animal after gently pulling the lower lid away from the eyeball. The lids were then gently held together for about one second to prevent loss of the test substance. The other eye remained untreated and served as the reference control. One single exposure, eye was not washed out after exposure. Immediately after administration of the test material, 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.

Observation period (in vivo):

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: Principles and Procedures for Evaluating the Toxicity of Household Substances, National Academy of Sciences, Washington DC p. 48 to 49.
Any other ocular effects were also noted. Examination of the eye was facilitated by the use of the light source from a standard opthalmoscope.

Number of animals or in vitro replicates:

3 male

Details on study design:

REMOVAL OF TEST SUBSTANCE
- Washing (if done): None
- Time after start of exposure: N/A


SCORING SYSTEM: Draize scoring system


TOOL USED TO ASSESS SCORE: standard opthalmoscope

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

conjunctivae score

Remarks:

(redness)

Basis:

animal #1

Remarks:

(mean score 1)

Time point:

other: overall at 24, 48 and 72 h

Score:

0

Max. score:

1

Reversibility:

fully reversible within: 24 hours

Results 2

Irritation parameter:

conjunctivae score

Remarks:

(redness)

Basis:

animal #2

Remarks:

(mean score 2)

Time point:

other: overall at 24, 48 and 72 h

Score:

0

Max. score:

0

Results 3

Irritation parameter:

conjunctivae score

Remarks:

(redness)

Basis:

animal #3

Remarks:

(mean score 3)

Time point:

other: overall at 24, 48 and 72 h

Score:

0

Max. score:

0

Results 4

Irritation parameter:

chemosis score

Basis:

animal #1

Remarks:

(mean score 1)

Time point:

other: overall at 24, 48 and 72 h

Score:

0

Max. score:

0

Results 5

Irritation parameter:

chemosis score

Basis:

animal #2

Remarks:

(mean score 2)

Time point:

other: overall at 24, 48 and 72 h

Score:

0

Max. score:

0

Results 6

Irritation parameter:

chemosis score

Basis:

animal #3

Remarks:

(mean score 3)

Time point:

other: overall at 24, 48 and 72 h

Score:

0

Max. score:

0

Results 7

Irritation parameter:

cornea opacity score

Basis:

animal #1

Remarks:

(mean score 1)

Time point:

other: overall at 24, 48 and 72 h

Score:

0

Max. score:

0

Results 8

Irritation parameter:

cornea opacity score

Basis:

animal #2

Remarks:

(mean score 2)

Time point:

other: overall at 24, 48 and 72 h

Score:

0

Max. score:

0

Results 9

Irritation parameter:

cornea opacity score

Basis:

animal #3

Remarks:

(mean score 3)

Time point:

other: overall at 24, 48 and 72 h

Score:

0

Max. score:

0

Results 10

Irritation parameter:

iris score

Basis:

animal #1

Remarks:

(mean score 1)

Time point:

other: overall at 24, 48 and 72 h

Score:

0

Max. score:

0

Results 11

Irritation parameter:

iris score

Basis:

animal #2

Remarks:

(mean score 2)

Time point:

other: overall at 24, 48 and 72 h

Score:

0

Max. score:

0

Results 12

Irritation parameter:

iris score

Basis:

animal #3

Remarks:

(mean score 3)

Time point:

other: overall at 24, 48 and 72 h

Score:

0

Max. score:

0

Irritant / corrosive response data:

See table below for raw data.
Reversibility of any observed effect: Changes fully reversible within 1 day

Other effects:

None

Any other information on results incl. tables

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), J. Soc. Cosmet. Chem.,13, 281-289 was used to classify the ocular irritancy potential of the test material. 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 eye irritancy potential of the test material.

 

If evidence of irreversible ocular damage is noted, the test material will be classified as corrosive to the eye.

Individual Scores and Individual Total Scores for Ocular Irritation

Rabbit Number and Sex	95 Male				24 Male				25 Male
	IPR = 2				IPR = 2				IPR = 2
Time After Treatment	1 Hour	24 Hours	48 Hours	72 Hours	1 Hour	24 Hours	48 Hours	72 Hours	1 Hour	24 Hours	48 Hours	72 Hours
CORNEA E = Degree of Opacity F = Area of Cornea Involved	0 0	0 0	0 0	0 0	0 0	0 0	0 0	0 0	0 0	0 0	0 0	0 0
Score (E x F) x 5	0	0	0	0	0	0	0	0	0	0	0	0
IRIS D	0	0	0	0	0	0	0	0	0	0	0	0
Score (D x 5)	0	0	0	0	0	0	0	0	0	0	0	0
CONJUNCTIVAE A = Redness B = Chemosis C = Discharge	1 0 1	0 0 0	0 0 0	0 0 0	0 0 0Re	0 0 0	0 0 0	0 0 0	0 0 0Re	0 0 0	0 0 0	0 0 0
Score (A + B + C) x 2	4	0	0	0	0	0	0	0	0	0	0	0
Total Score	4	0	0	0	0	0	0	0	0	0	0	0

 

IPR = Initial pain reaction

Re = White residual test material noted in the treated eye

Applicant's summary and conclusion

Interpretation of results:

other: not classified

Remarks:

Criteria used for interpretation of results: EU

Conclusions:

The test material produced a maximum group mean score of 1.3 and was classified as "practically non-irritant (Class 2 on a 1 to 8 scale)" to the rabbit eye according to a modified Kay and Calandra classification scheme.

Executive summary:

In a primary eye irritation study (0656/0282), ca. 23 mg of neat test material was instilled into the conjunctival sac of the right eye of a male New Zealand White rabbit. The eye was not washed after treatment. The animal was then observed for 72 hours.  Irritation was scored by the method of the Draize scoring system.

In the three animals tested, the test material only produced minimal conjunctival irritation in one treated eye one hour after treatment. Two treated eyes appeared normal throughout the study and the remaining treated eye appeared normal at the 24-hour observation.  In this study, the test material should not be classified.