(E)-2-((4-(ethyl(2-hydroxyethyl)amino)phenyl)diazenyl)-6-methoxy-3-methylbenzo[d]thiazol-3-ium trichlorozincate

Eye irritation

Administrative data

Endpoint:

eye irritation: in vivo

Type of information:

other: read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Study period:

1995-07-25 to 1995-09-01

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study

Remarks:

The reliability of the original study used in Read Across is 1. Justification for Read Across is given in Section 13 of IUCLID.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1995

Report date:

1995

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 405 (Acute Eye Irritation / Corrosion)

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

Similar Substance 01 - BB 041

IUPAC Name:

Similar Substance 01 - BB 041

Test animals / tissue source

Species:

rabbit

Strain:

New Zealand White

Details on test animals or tissues and environmental conditions:

Test animals
- Source: Charles River, Stolzenseeweg 32-36 D-88353 Kisslegg
- Number of Animals/test: 1 mal; 2 females
- Age at treatment: 15 weeks
- Bodyweight at start of treatment: 2.7 kg (male); 2.4-2.8 kg (females)
- Acclimatization: 5 days
- Housing: one animal per cage under standardized conditions
- Diet (e.g. ad libitum): ad libitum Kilba 341, Batch no 90/95 rabbit maintenance diet (“Kilba”,Klingentalmühle A, CH-4303 Kaiseraugst)
- Water (e.g. ad libitum): ad libitum, tap-water from Ittingen

Environmental Conditions
- Temperature (°C): 20 ± 3
- Humidity (%): 40-70
- Photoperiod (hrs dark/hrs light): 12/12, music during light period
- Air changes per hour: 10-15

Test system

Vehicle:

unchanged (no vehicle)

Controls:

yes

Amount / concentration applied:

0.1 g test substance

Observation period (in vivo):

examination after 1 h, 24h, 48h, 72 h, 7 days and 14 days

Number of animals or in vitro replicates:

1 male, 2 females

Details on study design:

Treatment:
the eyes of the animals were examined for intactness once, one day prior to test article administration. Only those animals with no signs of ocular injury or irritation were used on the test.
On the test day, 0.1 g of the test article (undiluted) was placed in the conjunctival sac of the left eye of each animal after gently pulling the lower lid away from the eyeball. The lids were gently held together for about one second to prevent loss of the test article. The right eye remained untreated and served as the reference control.
In case of equivocal results when comparing the treated and untreated eyes, the illustration guide from the Consumer Product Safety Commission Washington, D.C. 20207 was used for additional control purposes (Washington, 1977).

Irritation Scores:
The eyes of each animal were examined for ocular irritation approximately 1, 24, 48, and 72 hours, as well as 7 and 14 days after administration. Any findings ascertained during examination were recorded and the numerical irritation scores were assigned thereafter based upon the severity of the individual findings. Therefore the description of observed finding may differ slightly from the respective numerical irritation scores.

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

cornea opacity score

Basis:

mean

Time point:

24/48/72 h

Score:

0.67

Max. score:

4

Reversibility:

fully reversible within: 7 days

Results 2

Irritation parameter:

iris score

Basis:

mean

Time point:

72 h

Score:

ca. 0.33

Max. score:

2

Reversibility:

fully reversible within: 7 days

Results 3

Irritation parameter:

conjunctivae score

Basis:

mean

Time point:

24/48/72 h

Score:

1.89

Max. score:

3

Reversibility:

fully reversible within: 14 days

Results 4

Irritation parameter:

chemosis score

Basis:

mean

Time point:

24/48/72 h

Score:

1.33

Max. score:

4

Reversibility:

fully reversible within: 14 days

Irritant / corrosive response data:

The test article showed a primary irritation score of 4.00, when applied to the conjunctival sac of the rabbit eye. Slight to moderate chemosis and/or reddening of the conjunctivae was noted in all animals, in most cases combined with hyperemia of the scleral blood vessels and discharge. These findings were reversible by day 14 after administration.
At 72 hours after administration a delay/reduction of the iridic light reflex was noted in one rabbit only- re-examination on day 7 revealed no abnormalities.
Blue and/or violet staining of the cornea, conjunctivae and/or sclera was noted up to and including the seventh day after administration. The duration of staining varied between animals and tissues, but was fully reversible in all cases. Staining was no longer evident in any animal (with insignificant exceptions of periocular fur) after 14 days of observation.
A corneal opacity was noted in one rabbit from 24 to 72 hours after administration. This finding was no longer present after seven days. No corrosion (i.e. visible roughening of the epithelium) of the cornea was observed at any of the reading times.

For detailed results see Table 1 (Box: any other information on results, incl. tables)

Any other information on results incl. tables

Table 1: According to EEC Commission Directive 93/21/EEC (April 27, 1993), the mean values of the scored for each type of lesion calculated for each animal separately:

Animal No.	Mean values 24-72- hours
	Cornea Opacity	Iris	Conjunctivae Redness	Conjunctivae Chemosis
22, male	0.00	0.00	1.67	1.33
23, female	2.00	0.33	2.00	1.33
24, female	0.00	0.00	2.00	1.33

 

Table 2: Eye irritation scores

Animal	sex		Cornea opacity	Iris	Conjunctivae Redness	Conjunctivae Chemosis	Cumul. Score	Mean Cumul. Score
1 hour
22	M	Not rinsed	0	0	-	2*	2	2.00
23	F	Not rinsed	0	0	-	2*	2
24	F	Not rinsed	0	0	-	2*	2
24 hours
22	M	Not rinsed	0	0	2*	2*	4	4.67
23	F	Not rinsed	2*	0	2*	2*	6
24	F	Not rinsed	0	0	2*	2*	4
48 hours
22	M	Not rinsed	0	0	2*	1	3	3.67
23	F	Not rinsed	2*	0	2*	1	5
24	F	Not rinsed	0	0	2*	1	3
72 hours
22	M	Not rinsed	0	0	1	1	2	3.67
23	F	Not rinsed	2*	1*	2*	1	6
24	F	Not rinsed	0	0	2*	1	3
7 days
22	M	Not rinsed	0	0	1	1	2	2.00
23	F	Not rinsed	0	0	1	1	2
24	F	Not rinsed	0	0	1	1	2
14 days
22	M	Not rinsed	0	0	0	0	0	0.00
23	F	Not rinsed	0	0	0	0	0
24	F	Not rinsed	0	0	0	0	0

* Positive effect

- Could not be assessed. Strong reaction to treatment may preclude evaluation of some parameters. Therefore the primary irritation score may differ from the mean cumulative score at 24, 48, and 72 hours

M male, F female

Applicant's summary and conclusion

Interpretation of results:

other: classified in Category 2 for eye irritation according to the CLP Regulation (EC) No.1272/2008

Conclusions:

Based on the fully reversibility of the staining and other relvant findings and the conjunctival redness score of 2 in two of the three rabbits, the test material is classified as "Category 2" (irritating to eyes).

Executive summary:

In a primary eye irritation study according to OECD 405, 0.1 g of the test substance was instilled into the conjunctival sac of the left eye of 3 young adult New Zealand White rabbits (1 male/ 2 females). The treated eyes were not rinsed after application. Scoring of irritation effects was performed approximately 1, 24, 48 and 72 hours, as well as 7 and 14 days after test article application. Irritation was scored by the method of Draize. The scores of each animal at 24, 48 and 72 hours were used for calculating the respective mean values for each type of lesion. The primary irritation score was calculated by totalling the individual cumulative scores at 24, 48, and 72 hours and then dividing the resulting total by the number of figures.

It was found to be 4.00 (max.13).

Chemosis and/or reddening of the conjunctivae, hyperemia of the scleral blood vessels and discharge were reversible by day 14 after administration.