Cyclohexanepropanal, 4-(2-methylpropyl)-

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

The study was conducted between 29 October 2013 and 12 November 2013.

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: The study is considered to be a reliability 1 as it has been conducted according to OECD Test Guideline 404 using an in vivo method and in compliance with GLP.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2014

Report date:

2014

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

3-[4-(2-methylpropyl)cyclohexyl]propanal

EC Number:

940-042-5

Cas Number:

1254940-85-6

Molecular formula:

C13H24O

IUPAC Name:

3-[4-(2-methylpropyl)cyclohexyl]propanal

Test material form:

other: Liquid

Details on test material:

Identification: IFF TM 10-202
Storage Conditions: Room temperature in the dark under nitrogen

Test animals

Species:

rabbit

Strain:

New Zealand White

Details on test animals or test system and environmental conditions:

Three New Zealand White (Hsdlf:NZW) strain rabbits were supplied by Harlan Laboratories UK Ltd., Leicestershire, UK. At the start of the study the animals weighed 2.12 to 2.34 kg and were twelve to twenty weeks old.
After an acclimatization period of at least five days each animal was given a number unique within the study which was written with a black indelible marker-pen on the inner surface of the ear and on the cage label.
The animals were individually housed in suspended cages. Free access to mains drinking water and food (2930C Teklad Global Rabbit diet supplied by Harlan Laboratories UK Ltd., Oxon, UK) was allowed throughout the study. The diet and drinking water were considered not to contain any contaminant of a level that might have affected the purpose or integrity of the study.
The temperature and relative humidity were set to achieve limits of 17 to 23 °C and 30 to 70% respectively.
The rate of air exchange was at least fifteen changes per hour and the lighting was controlled by a time switch to give twelve hours continuous light (06:00 to 18:00) and twelve hours darkness.
The animals were provided with environmental enrichment items which were considered not to contain any contaminant of a level that might have affected the purpose or integrity of the study.

Test system

Type of coverage:

occlusive

Preparation of test site:

clipped

Vehicle:

unchanged (no vehicle)

Controls:

not required

Amount / concentration applied:

0.5 mL of the test item was applied directly to the skin

Test Item Formulation and Experimental Preparation
For the purpose of the study the test item was used as supplied. The absorption of the test item was not determined

Duration of treatment / exposure:

Four hours

Observation period:

14 days

Number of animals:

Three

Details on study design:

On the day before the test each of a group of three rabbits was clipped free of fur from the dorsal/flank area using veterinary clippers. Only animals with a healthy intact epidermis by gross observation were selected for the study.
On the day of the test a suitable test site was selected on the back of each rabbit. A quantity of 0.5 mL of the test item was applied directly to the skin under a 2.5 cm x 2.5 cm cotton gauze patch. The patch was secured in position with a strip of surgical adhesive tape. To prevent the animals interfering with the patches, the trunk of each rabbit was wrapped in an elasticated corset and the animals were returned to their cages for the duration of the exposure period.
Four hours after application the corset and patches were removed from each animal and any residual test item removed by gentle swabbing with cotton wool soaked in distilled water.
Immediately following removal of the patches and approximately 1, 24, 48 and 72 hours later, the test sites were examined for evidence of primary irritation and scored.
Any other skin reactions and clinical signs of toxicity, if present, were also recorded.
Additional observations were made on Days 7 and 14 to assess the reversibility of skin reactions.
Individual body weights were recorded on Day 0 (the day of dosing) and at the end of the observation period.

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

other: Erythema/Eschar Formation

Basis:

animal #1

Remarks:

73690 Male

Time point:

other: 24, 48 and 72 hours

Score:

2

Max. score:

4

Reversibility:

fully reversible within: 14 days

Remarks on result:

other: loss of skin elasticity at 72 hour timepoint. At 7 days moderate desquamation noted.

Results 2

Irritation parameter:

other: Erythema/Eschar Formation

Basis:

animal #2

Remarks:

73691 Male

Time point:

other: 24, 48 and 72 hours

Score:

2

Max. score:

4

Reversibility:

fully reversible within: 14 days

Remarks on result:

other: loss of skin elasticity at 72 hour timepoint. At 7 days moderate desquamation and glossy skin noted.

Results 3

Irritation parameter:

other: Erythema/Eschar Formation

Basis:

animal #3

Remarks:

73692 Male

Time point:

other: 24, 48 and 72 hours

Score:

2

Max. score:

4

Reversibility:

fully reversible within: 14 days

Remarks on result:

other: loss of skin elasticity and light brown discoloration of the epidermis noted at 72 hours. At 7 days crust formation and adverse reaction prevented accurate evaluation of erythema.

Results 4

Irritation parameter:

edema score

Basis:

animal #1

Remarks:

73690 Male

Time point:

other: 24, 48 and 72 hours

Score:

1

Max. score:

4

Reversibility:

fully reversible within: 7 days

Results 5

Irritation parameter:

edema score

Basis:

animal #2

Remarks:

73691 Male

Time point:

other: 24, 48 and 72 hours

Score:

1

Max. score:

4

Reversibility:

fully reversible within: 7 days

Results 6

Irritation parameter:

edema score

Basis:

animal #3

Remarks:

73692 Male

Time point:

other: 24, 48 and 72 hours

Score:

1

Max. score:

4

Reversibility:

fully reversible within: 14 days

Remarks on result:

other: At 7 days adverse reaction prevented accurate evaluation of edema

Irritant / corrosive response data:

Well-defined erythema and very slight edema were noted at all treated skin sites at the 24, 48 and 72-Hour observations. Very slight erythema was noted at two treated skin sites at the 7-Day observation.
Loss of skin elasticity was noted at all treated skin sites at the 72-Hour observation with light brown discoloration of the epidermis also noted at one treated skin site at the 72-Hour observation. Glossy skin and/or moderate desquamation was noted at two treated skin sites with crust formation, which prevented accurate evaluation of erythema and edema, noted at the remaining treated skin site at the 7-Day observation.
All treated skin sites appeared normal at the 14-Day observation

Other effects:

Body weight
All animals showed expected gain in body weight during the study.

Any other information on results incl. tables

Individual skin reactions

Skin reaction	Observation Time (following patch removal)	Individual scores – Rabbit No. & sex			Total
		73690 Male	73691 Male	73692 Male
Erythema / Eschar Formation	Immediately	0	0	0	(0)
	1 h	0	0	0	(0)
	24 h	2	2	2	6
	48 h	2	2	2	(6)
	72 h	2Le	2Le	2LeBr	6
	7 days	1D	1DG	?eCf	(2-6)
	14 days	0	0	0	(0)
Edema Formation	Immediately	0	0	0	(0)
	1 h	0	0	0	(0)
	24 h	1	1	1	3
	48 h	1	1	1	(3)
	72 h	1	1	1	3
	7 days	0	0	?2od	(0-4)
	14 days	0	0	0	(0)
Sum of 24 and 72 h readings (S)					18
Primary irritation Index (S/6)					(18/6) = 3.0
Classification					Moderate irritant

( ) = Total values not used for calclation of primary dermal irritation index.

Le = Loss of skin elasticity

Br = Light brown discolouration of the epidermis

D = Moderate desquamation

G = Gloassy skin

Cf = Crust formation

?e = Adverse reaction prevented accurate evaluation of erythema

?od = Adverse reaction prevented accurate evaluation of edema

Individual body weights and body weight change

Rabbit No. & Sex	Individual Body Weight (kg)		Body Weight Change (kg)
	Day 0	Day 14
73690 Male	2.12	2.56	0.44
73691 Male	2.34	2.74	0.40
73692 Male	2.23	2.48	0.25

Applicant's summary and conclusion

Interpretation of results:

not irritating

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

The test item produced a primary irritation index of 3.0 and was classified as a moderate irritant to rabbit skin according to the Draize classification scheme. No corrosive effects were noted.
The test item meets the criteria for classification as a Mild irritant (Category 3) according to the Globally Harmonized System of Classification and Labelling of Chemicals.
The test item does not meet the criteria for classification according to the Regulation (EC) No 1272/2008, relating to the Classification, Labelling and Packaging of Substances and Mixtures.

Executive summary:

The dermal irritation potential of the test substance, TM 10-202, was assessed as not irritating according to OECD Test Guideline 404 using an in vivo method.