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Diss Factsheets

Administrative data

Endpoint:
eye irritation: in vivo
Type of information:
experimental study
Adequacy of study:
other information
Study period:
August 1996
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
1996
Report date:
1996

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 405 (Acute Eye Irritation / Corrosion)
Deviations:
yes
Remarks:
- 4 instead of 3 animals

Test material

Constituent 1
Chemical structure
Reference substance name:
(±)-13-ethyl-3-methoxygona-1,3,5(10),8-tetraen-17-one
EC Number:
227-699-7
EC Name:
(±)-13-ethyl-3-methoxygona-1,3,5(10),8-tetraen-17-one
Cas Number:
5941-92-4
Molecular formula:
C20H24O2
IUPAC Name:
13-ethyl-3-methoxy-6,7,11,12,13,14,15,16-octahydro-17H-cyclopenta[a]phenanthren-17-one (non-preferred name)

Test animals / tissue source

Species:
rabbit
Strain:
New Zealand White

Test system

Vehicle:
unchanged (no vehicle)
Controls:
other: the left eye, which remained untreated, served as control.
Amount / concentration applied:
0.1 mL (corresponded to 64-73 mg substance)
Duration of treatment / exposure:
test substance remained in the eye (eye was not rinsed)
Observation period (in vivo):
4 days
Number of animals or in vitro replicates:
2 males and 2 females

Results and discussion

In vivo

Resultsopen allclose all
Irritation parameter:
cornea opacity score
Basis:
mean
Time point:
other: 24, 48, 72 h
Score:
0
Max. score:
4
Irritation parameter:
iris score
Basis:
mean
Time point:
other: 24, 48, 72 h
Score:
0
Max. score:
2
Irritation parameter:
conjunctivae score
Remarks:
reddening
Basis:
mean
Time point:
other: 24, 48, 72 h
Score:
0.5
Max. score:
3
Reversibility:
fully reversible
Irritation parameter:
conjunctivae score
Remarks:
swelling
Basis:
mean
Time point:
other: 24, 48, 72 h
Score:
0
Max. score:
4

Any other information on results incl. tables

Table 1: Results of the study

    

 Irritant effects (score)         

Animal no. (sex)

 Irritation parameter

 24 h 48 h  72 h  Mean scores

 1 (M)

 Cornea

 0 0  0  0.0
 

 Iris

 0 0 0 0.0
 

 Conjunctiva (reddening)

 1 0 0 0.33
 

 Conjunctiva (swelling)

 0 0 0 0.0

 2 (M)

 Cornea

 0 0 0 0.0
   Iris 0 0 0 0.0
   Conjunctiva (reddening) 1 1 0 0.66
   Conjunctiva (swelling) 0 0 0 0.0

 3 (F)

  Cornea 0 0 0 0.0
   Iris 0 0 0 0.0
   Conjunctiva (reddening) 1 0 0 0.33
   Conjunctiva (swelling) 0 0 0 0.00

 4 (F)

  Cornea 0 0 0 0.0
   Iris 0 0 0 0.0
   Conjunctiva (reddening) 1 1 0 0.66
   Conjunctiva (swelling) 0 0 0 0.00

The control eyes were without findings.

The single administration of 0.1 mL test substance (64- 73 mg ZK 47568) into the conjunctival sac of the right eye led in 4 of the 4 rabbits to slight transient reddening of the conjunctivae .

Applicant's summary and conclusion

Executive summary:

In a local tolerance test on the rabbit eye according to OECD TG 405 a single application of the test substance into the conjunctival sac provoked slight transient irritation.