(2E)-2-methyl-3-(4-methylphenyl)prop-2-en-1-ol

Eye irritation

Administrative data

Endpoint:

eye irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

04-10-2011 to 19-10-2011

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Guideline study performed under GLP. All relevant validity criteria were met.

Justification for type of information:

Information as to the availability of the in vivo study is provided in 'attached justification'.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2012

Report date:

2012

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 405 (Acute Eye Irritation / Corrosion)

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

Test guideline 4

Qualifier:

according to guideline

Guideline:

other: Japanese Ministry of Agriculture, Forestry and Fisheries (JMAFF), 12 Nousan, Notification No 8147, November 2000

Deviations:

no

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

(2E)-2-methyl-3-(4-methylphenyl)prop-2-en-1-ol

EC Number:

700-548-7

Cas Number:

56138-10-4

Molecular formula:

C11H14O

IUPAC Name:

(2E)-2-methyl-3-(4-methylphenyl)prop-2-en-1-ol

Details on test material:

- Physical state: Waxy solid at temperature < 23°C and liquid at temperature > 23°C
- Storage condition of test material: In refrigerator (2-8°C) in the dark under nitrogen
- Other: white waxy solid at temperature < 23°C and clear colourless liquid at temperature > 23°C

Test animals / tissue source

Species:

rabbit

Strain:

New Zealand White

Details on test animals or tissues and environmental conditions:

TEST ANIMALS
- Source: Recognised Supplier
- Age at study initiation: 25 to 28 weeks
- Weight at study initiation: 3596 to 3791 g
- Housing: Individually housed in cages with perforated floors, with shelters and cage enrichment
- Diet (ad libitum): Global Diet 2030 (Recognised Supplier); provided ad libitum (approximately 100 g per day)
- Water (ad libitum): mains drinking water, ad libitum
- Acclimation period: at least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 21.0 ± 3.0 (actual: 19.1 to 22.0°C)
- Humidity (%): 40 to 70 (actual: 43 – 86%)
- Air changes (per hr): at least 15
- Photoperiod (hrs dark / hrs light): 12 h light / 12 h dark

IN-LIFE DATES: From: 04-10-2011 To: 19-10-2011

Test system

Vehicle:

unchanged (no vehicle)

Controls:

other: one eye remained untreated

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 0.1 mL. The test item was in a fluid state at the time of weighing, it was not heated and the test item was applied undiluted.
- Concentration (if solution): undiluted

VEHICLE
- Amount(s) applied (volume or weight with unit): Not applicable. The test item was in a fluid state at the time of weighing, it was not heated and the test item was applied undiluted.

Duration of treatment / exposure:

A volume of 0.1 mL of the test item, was placed into the conjunctival sac of the right eye, formed by gently pulling the lower lid away from the eyeball. The upper and lower eyelids were held together for about one second immediately after treatment, to prevent loss of the test item, and then released. The other eye remained untreated and was used for control purposes. Irrigation of the eye with distilled water or saline, after 1 hour was deemed not necessary or was not reported during the study.

Observation period (in vivo):

Ocular assessment was conducted at approximately 1, 24, 48 and 72 hours after instillation of the test item, according to numerical evaluation.

Number of animals or in vitro replicates:

3 (male). Testing was conducted sequentially following testing with a sentinel.

Details on study design:

REMOVAL OF TEST SUBSTANCE
- Washing (if done): none

SCORING SYSTEM:
The irritation was assessed according to Draize (1977) numerical scoring system. At each observation period, the highest scores given were recorded. Any other ocular effects were also noted.

TOOL USED TO ASSESS SCORE:
- Immediately after the 24-hour observation, a solution of 2% fluorescein in water (adjusted to pH 7.0) was instilled into both eyes of each animal to quantitatively determine corneal epithelial damage. This procedure was repeated to assess recovery.
- Examination of the eye was facilitated by the use of the light source from a standard ophthalmoscope.

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

cornea opacity score

Basis:

mean

Remarks:

n = 3

Time point:

24/48/72 h

Score:

0

Max. score:

4

Results 2

Irritation parameter:

iris score

Basis:

mean

Remarks:

n = 3

Time point:

24/48/72 h

Score:

0

Max. score:

2

Results 3

Irritation parameter:

conjunctivae score

Basis:

mean

Remarks:

n = 3

Time point:

24/48/72 h

Score:

2

Max. score:

3

Reversibility:

fully reversible within: 7 days

Remarks on result:

positive indication of irritation

Results 4

Irritation parameter:

chemosis score

Basis:

mean

Remarks:

n = 3

Time point:

24/48/72 h

Score:

1

Max. score:

4

Reversibility:

fully reversible within: 7 days

Results 5

Irritation parameter:

cornea opacity score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0

Max. score:

4

Results 6

Irritation parameter:

iris score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0

Max. score:

2

Results 7

Irritation parameter:

conjunctivae score

Basis:

animal #1

Time point:

24/48/72 h

Score:

2

Max. score:

3

Reversibility:

fully reversible within: 7 days

Remarks on result:

positive indication of irritation

Results 8

Irritation parameter:

chemosis score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0.7

Max. score:

4

Reversibility:

fully reversible within: 7 days

Results 9

Irritation parameter:

cornea opacity score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Max. score:

4

Results 10

Irritation parameter:

iris score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Max. score:

2

Results 11

Irritation parameter:

conjunctivae score

Basis:

animal #2

Time point:

24/48/72 h

Score:

2

Max. score:

3

Reversibility:

fully reversible within: 7 days

Remarks on result:

positive indication of irritation

Results 12

Irritation parameter:

chemosis score

Basis:

animal #2

Time point:

24/48/72 h

Score:

1

Max. score:

4

Reversibility:

fully reversible within: 7 days

Results 13

Irritation parameter:

cornea opacity score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0

Max. score:

4

Results 14

Irritation parameter:

iris score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0

Max. score:

2

Results 15

Irritation parameter:

conjunctivae score

Basis:

animal #3

Time point:

24/48/72 h

Score:

2

Max. score:

4

Reversibility:

fully reversible within: 7 days

Remarks on result:

positive indication of irritation

Results 16

Irritation parameter:

chemosis score

Basis:

animal #3

Time point:

24/48/72 h

Score:

1.3

Max. score:

4

Reversibility:

fully reversible within: 7 days

Irritant / corrosive response data:

No corneal effects were noted, all scores were zero.
No iridial effects were noted, all scores were zero.
Moderate conjunctival irritation (score = 2) was noted in all treated eyes 1 h through 72 h after treatment. Chemosis was moderate (score = 2) to minimal (score = 1) at the 24 h through 72 h observation. In all treated eyes and all effects had reversed (score = 0) at the 72 h observation.

Other effects:

All animals showed expected gain in bodyweight during the study.

Any other information on results incl. tables

Table 1.0: Individual and Mean Scores for Cornea, Iris and Conjunctivae

Number and Sex	Time After Treatment	Corneal Opacity		Iridial Inflammation	Conjunctival Redness	Conjunctival Chemosis
1# Male	24 Hours	0		0	2	1
	48 Hours	0	0		2	1
	72 Hours	0	0		2	0
Total		0		0	6	2
Mean		0.0		0.0	2.0 #	0.7 #
#2 Male	24 Hours	0		0	2	1
	48 Hours	0	0		2	1
	72 Hours	0	0		2	1
Total		0		0	6	3
Mean		0.0		0.0	2.0 #	1.0 #
#3 Male	24 Hours	0		0	2	1
	48 Hours	0	0		2	1
	72 Hours	0	0		2	1
Total		0		0	6	1
Mean		0.0	0.0		2.0 #	1.0 #

# All effects reversed by day 7

Applicant's summary and conclusion

Interpretation of results:

Category 2 (irritating to eyes) based on GHS criteria

Remarks:

Criteria used for interpretation of results: EU

Conclusions:

Under the conditions of this study the test item is considered irritating to the eye.

Executive summary:

The study was performed to OECD TG 405, EU Method B.5, US EPA OPPTS 870.2400 and Japan (JMAFF) 12 Nousan, Notification No 8147 guidelines under GLP to assess the irritancy potential of the test item to the eye following a single application in the New Zealand White rabbit. A volume of 0.1 ml of the test item was placed into the conjunctival sac of one eye of three rabbits. The other eye remained untreated and was used for control purposes. The test was conducted in a stepwise manner conducted singularly and then on a further two rabbits in accordance with the guideline. Assessment of ocular damage/irritation was made approximately 1 hour and 24, 48 and 72 hours following treatment. A single application of the test item to the non-irrigated eye of three rabbits produced no corneal opacity, no iridial inflammation and moderate conjunctival irritation (redness, score = 2) and moderate to slight chemosis (score = 2 or 1) at 24 hours through 72 hours. All treated eyes appeared normal at the 7 day observation (score = 0). Under the conditions of this study, the test item is considered to be irritating to the eye.