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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
Study period:
September 21 -25, 1992
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
The study has been performed according to OECD and/or EC guidelines and according to GLP principles. Limited information available to verify the composition of the used test substance.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1992
Report date:
1992

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
OECD Guideline 405 (Acute Eye Irritation / Corrosion)
Version / remarks:
(1987)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method B.5 (Acute Toxicity: Eye Irritation / Corrosion)
Version / remarks:
(1984)
Deviations:
no
GLP compliance:
yes

Test material

Constituent 1
Reference substance name:
2,4-bis[N'-(4-methylphenyl)ureido]toluene
EC Number:
411-790-5
EC Name:
2,4-bis[N'-(4-methylphenyl)ureido]toluene
Cas Number:
54390-87-3
Molecular formula:
C23H24N4O2, C24H34N4O2
IUPAC Name:
3-(2-methyl-3-{[(4-methylphenyl)carbamoyl]amino}phenyl)-1-(4-methylphenyl)urea; 3-(2-methyl-5-{[(4-methylphenyl)carbamoyl]amino}phenyl)-1-(4-methylphenyl)urea; 3-{2-methyl-3-[(octylcarbamoyl)amino]phenyl}-1-(4-methylphenyl)urea
Details on test material:
- Name of test material (as cited in study report): KY-MA
- Physical state: Light yellow solid

Test animals / tissue source

Species:
rabbit
Strain:
New Zealand White
Details on test animals or tissues and environmental conditions:
- Source: Broekman Institute, Someren, The Netherlands
- Age at study initiation: 14 -17 weeks
- Weight at study initiation: 2656 - 2971 grams
- Housing: Individually housed in cages with perforated floors.
- Diet: Free access to standard laboratory rabbit diet (LKK-20, pellet diameter 4 mm, Hope Farms, Woerden, The Netherlands).
- Water: Free access to tap water diluted with decalcified water.
- Acclimation period: At least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 21
- Humidity (%): 55
- Air changes (per hr): 15
- Photoperiod (hrs dark / hrs light): 12/12

Fluctuations from these conditions were noted, but were considered not the have affected study integrity.

Test system

Vehicle:
unchanged (no vehicle)
Controls:
other: One eye of each animal remained untreated and served as the reference control.
Amount / concentration applied:
TEST MATERIAL- Amount(s) applied (volume or weight with unit): average 55 +/- 1 mg
Duration of treatment / exposure:
Single instillation on Day 1.
Observation period (in vivo):
The eyes of each animal were examined approximately 1, 24, 48 and 72 hours after instillation of the test substance.
Number of animals or in vitro replicates:
3 males
Details on study design:
TREATMENT
The test substance was instilled in the conjunctival sac of one 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.

REMOVAL OF TEST SUBSTANCE
-Washing (if done): No

OBSERVATIONS
- Mortality/Viability/Toxicity: Daily.
- Body Weight: Day 1 of test (day of treatment)
- Necropsy: Not performed.
- Irritation:
The eyes of each animal were examined approximately 1, 24, 48 and 72 hours after instillation of the test substance.
The irritation scores and a description of all other (local) effects were recorded. The irritation was assessed according to OECD 405.

Results and discussion

In vivo

Resultsopen allclose all
Irritation parameter:
cornea opacity score
Basis:
animal #1
Time point:
24/48/72 h
Score:
0
Max. score:
4
Remarks on result:
no indication of irritation
Irritation parameter:
cornea opacity score
Basis:
animal #2
Time point:
24/48/72 h
Score:
0
Max. score:
4
Remarks on result:
no indication of irritation
Irritation parameter:
cornea opacity score
Basis:
animal #3
Time point:
24/48/72 h
Score:
0
Max. score:
4
Remarks on result:
no indication of irritation
Irritation parameter:
iris score
Basis:
animal #1
Time point:
24/48/72 h
Score:
0
Max. score:
2
Remarks on result:
no indication of irritation
Irritation parameter:
iris score
Basis:
animal #2
Time point:
24/48/72 h
Score:
0
Max. score:
2
Remarks on result:
no indication of irritation
Irritation parameter:
iris score
Basis:
animal #3
Time point:
24/48/72 h
Score:
0
Max. score:
2
Remarks on result:
no indication of irritation
Irritation parameter:
conjunctivae score
Remarks:
(redness)
Basis:
animal #1
Time point:
24/48/72 h
Score:
0.67
Max. score:
3
Reversibility:
fully reversible within: 72 hours
Irritation parameter:
conjunctivae score
Remarks:
(redness)
Basis:
animal #2
Time point:
24/48/72 h
Score:
0.33
Max. score:
3
Reversibility:
fully reversible within: 48 hours
Irritation parameter:
conjunctivae score
Remarks:
(redness)
Basis:
animal #3
Time point:
24/48/72 h
Score:
0.67
Max. score:
3
Reversibility:
fully reversible within: 72 hours
Irritation parameter:
chemosis score
Basis:
animal #1
Time point:
24/48/72 h
Score:
0
Max. score:
4
Remarks on result:
no indication of irritation
Irritation parameter:
chemosis score
Basis:
animal #2
Time point:
24/48/72 h
Score:
0
Max. score:
4
Remarks on result:
no indication of irritation
Irritation parameter:
chemosis score
Basis:
animal #3
Time point:
24/48/72 h
Score:
0.33
Max. score:
4
Reversibility:
fully reversible within: 24 hours
Irritant / corrosive response data:
Instillation of KY-MA into one eye of each of the three male rabbits affected the conjunctivae. The irritation of the conjunctivae had resolved within 48 hours after instillation in animal #2 and within 72 hours in animals #1 and #3.
Treatment of the eyes with 2% fluorescein, 24 hours after test substance instillation revealed no corneal epithelial damage in any of the animals.
There was no evidence of ocular corrosion.
Other effects:
No staining of peri-ocular tissues by the test substance was observed.
No toxic symptoms were observed in the animals during the test period and no mortality occurred.

Applicant's summary and conclusion

Interpretation of results:
other: not irritating
Remarks:
according to Regulation (EC) No 1272/2008 and its amendments
Conclusions:
In an eye irritation study with rabbits, performed according to OECD 405 (1987) and EC B.5 (1984) test guidelines, limited irritation was observed.
Executive summary:

Under the conditions of this study, KY-MA resulted in adverse effects on the conjunctivae in all three animals, which had resolved within 48 -72 hours after instillation. Ocular corrosion was not observed in any of the rabbits.

No signs of systemic intoxication were observed during the study period. Based on these results, KY-MA does not have to be classified and has no obligatory labelling requirement for eye irritation according to Regulation (EC) No 1272/2008 on classification, labelling and packaging of substances and mixtures.