Tris(2-hydroxyethyl)ammonium salts of tall-oil fatty acids

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

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2012

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 405 (Acute Eye Irritation / Corrosion)

Version / remarks:

of 2002

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

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

Deviations:

no

Test guideline 3

Qualifier:

according to guideline

Guideline:

EPA OPPTS 870.2400 (Acute Eye Irritation)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Test material form:

other: semi-solid, wax-like (at 20°C)

Details on test material:

- Name of test material (as cited in study report): WS400102

Test animals / tissue source

Species:

rabbit

Strain:

New Zealand White

Details on test animals or tissues and environmental conditions:

TEST ANIMALS

- Number and Sex: 3 males
- Animal supplier: S&K-LAP Kft., 2173 Kartal, Császár út 135, Hungary
- Age on day of dosing (Day 0): Ca. 11 weeks old (young adult)
- Weight prior to dosing (Day 0): Minimum 2690 g, maximum 2948 g
- Housing: Individual housing in AAALAC approved metal wire rabbit cages allowing for some
social interaction with rabbit(s) in adjacent cages
- Diet (ad libitum): Commercially available rabbit diet, AGRIBRANDS Europe Hungary PLC, H-5300 Karcag, Hungary
- Water (ad libitum): Tap water from municipal supply
- Acclimation period: 7 days prior to study start under laboratory conditions.

Water was regularly analysed for contaminants, detailed information on the diet was provided by the supplier. Water and diet used in the present study were not considered to adversely affect the purpose or integrity of the study.

ENVIRONMENTAL CONDITIONS

Controlled environment, environmental conditions were:
- Ventilation, air changes per hour: 15-20
- Temperature (°C): 19.7 to 27.1°C
- Relative Humidity (%): 32 to 83%
- Photoperiod (artificial lighting): 12 hrs day / 12 hrs night
Relative humidity and temperature at times slightly exceeding the upper target limits of 70% and 23°C, respectively were not considered to have compromised the integrity or validity of the study.

Test system

Vehicle:

unchanged (no vehicle)

Controls:

not required

Amount / concentration applied:

0.1 mL of the undiluted wax-like test material was administered into the conjunctival sac of one eye per rabbit (left eye). The contralateral eye (right eye) remained untreated to serve as a control.

Duration of treatment / exposure:

Residual test material was seen in the treated eyes. Therefore, the eyes were rinsed with physiological saline at 1 hour after test material instillation.

Observation period (in vivo):

21 days

Number of animals or in vitro replicates:

3 adult male rabbits

Details on study design:

EYE EVALUATION:

Within 2.5 hours before treatment start both eyes of each animal were investigated to ensure that there were no pre-existing corneal damage, eye irritation or ocular defects.

One animal was initially treated and, in the absence of a severe effect at 1 hour post instillation, the remaining two animals were committed to the study.

Eyes were evaluated in all animals at approximately 1, 24, 48 & 72 hours and 7, 14 & 21 days after test material instillation adopting the numerical scoring system listed in Table 1 in the field below. Grades attained at 24, 48 and 72 hours after instillation were included in the mean gradings of ocular lesions and used for evaluation of the necessity of eye irritation/corrosion classification.

Equipment used for eye evaluation: Ophthalmoscope or pencil beam torch

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

cornea opacity score

Basis:

animal #1

Time point:

24/48/72 h

Score:

1

Max. score:

4

Reversibility:

fully reversible within: 7 days

Results 2

Irritation parameter:

cornea opacity score

Basis:

animal #2

Time point:

24/48/72 h

Score:

1

Max. score:

4

Reversibility:

fully reversible within: 7 days

Results 3

Irritation parameter:

cornea opacity score

Basis:

animal #3

Time point:

24/48/72 h

Score:

1

Max. score:

4

Reversibility:

fully reversible within: 7 days

Results 4

Irritation parameter:

other: corneal area affected

Basis:

mean

Time point:

24/48/72 h

Score:

2.8

Max. score:

4

Reversibility:

fully reversible within: 7 days

Results 5

Irritation parameter:

iris score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0

Max. score:

2

Results 6

Irritation parameter:

iris score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Max. score:

2

Results 7

Irritation parameter:

iris score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0

Max. score:

2

Results 8

Irritation parameter:

conjunctivae score

Remarks:

redness

Basis:

animal #1

Time point:

24/48/72 h

Score:

1.3

Max. score:

3

Reversibility:

fully reversible within: 14 days

Results 9

Irritation parameter:

conjunctivae score

Remarks:

redness

Basis:

animal #2

Time point:

24/48/72 h

Score:

2

Max. score:

3

Reversibility:

fully reversible within: 21 days

Results 10

Irritation parameter:

conjunctivae score

Remarks:

redness

Basis:

animal #3

Time point:

24/48/72 h

Score:

2

Max. score:

3

Reversibility:

fully reversible within: 21 days

Results 11

Irritation parameter:

chemosis score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0.3

Max. score:

4

Reversibility:

fully reversible within: 48 h

Results 12

Irritation parameter:

chemosis score

Basis:

animal #2

Time point:

24/48/72 h

Score:

2

Max. score:

4

Reversibility:

fully reversible within: 7 days

Results 13

Irritation parameter:

chemosis score

Basis:

animal #3

Time point:

24/48/72 h

Score:

1.7

Max. score:

4

Reversibility:

fully reversible within: 7 days

Results 14

Irritation parameter:

other: Discharge

Basis:

animal #1

Time point:

24/48/72 h

Score:

0.7

Max. score:

3

Reversibility:

fully reversible within: 72 h

Results 15

Irritation parameter:

other: Discharge

Basis:

animal #2

Time point:

24/48/72 h

Score:

3

Max. score:

3

Reversibility:

fully reversible within: 7 days

Results 16

Irritation parameter:

other: Discharge

Basis:

animal #3

Time point:

24/48/72 h

Score:

2

Max. score:

3

Reversibility:

fully reversible within: 7 days

Irritant / corrosive response data:

Iridic lesions were not evident throughout the study. Corneal lesions (opacity grade 1, except for grade 2 in one animal at 1 h after test material instillation) were seen in all animals until 72 hours after test material instillation and had entirely disappeared in all animals by 7 days after instillation. In each animal, the area of cornea affected was scored grade 4 to 0. Conjunctival redness grade 2, chemosis grade 3 and discharge grade 3, were seen in all animals at 1 h after instillation, therafter gradually decreasing in severity and incidence. By 7 days after instillation chemosis and discharge had fully disappeared in all animals and by 21 days after instillation conjunctival redness had fully disappeared. Control eyes were without ocular findings throughout the observation period.

Other effects:

Observation of the animals for defined behavioural criteria led to the conclusion that instillation of the test material induced slight initial pain (grade 2). Any other signs of systemic toxicity or ill health were not evident and bodyweight was unaffected by treatment with the test material.

Applicant's summary and conclusion

Interpretation of results:

other: irritating

Conclusions:

The substance is irritating to eyes. All findings noted were fully reversible.