Tetrahydro-3-pentyl-2H-pyran-4-yl acetate

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation / corrosion, other

Remarks:

An OECD TG 404 was availabe to assess the skin irritation and skin corrosion

Type of information:

experimental study

Adequacy of study:

key study

Study period:

October 22, 1979 - November 5, 1979

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Reliability 2 is assigned because the study is conducted similar to OECD TG 404 in compliance with GLP, with deviations that influence the quality of the results.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1979

Report date:

1979

Materials and methods

Test guideline

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

Version / remarks:

(1981)

Deviations:

yes

Remarks:

Exposure was 24 hours and observation period restricted to 72 hours.

Principles of method if other than guideline:

J.H. Draize, "Dermal Toxicity", Appraisal of the Safety of Chemicals in Foods, Drugs and Cosmetics (The Association of Food and Drug Officials of the United States, 1975), p. 47.

GLP compliance:

yes

Test material

Test material information

1

Reference substance name:

Tetrahydro-3-pentyl-2H-pyran-4-yl acetate

EC Number:

242-640-5

EC Name:

Tetrahydro-3-pentyl-2H-pyran-4-yl acetate

Cas Number:

18871-14-2

Molecular formula:

C12H22O3

IUPAC Name:

tetrahydro-3-pentyl-2H-pyran-4-yl acetate

2

Reference substance name:

Reaction mass of (3S,4S)-3-pentyltetrahydro-2H-pyran-4-yl acetate and (3R,4S)-3-pentyltetrahydro-2H-pyran-4-yl acetate

Molecular formula:

C12H22O3

IUPAC Name:

Reaction mass of (3S,4S)-3-pentyltetrahydro-2H-pyran-4-yl acetate and (3R,4S)-3-pentyltetrahydro-2H-pyran-4-yl acetate

Constituent 1

Reference substance name:

(3S,4S)-3-pentyltetrahydro-2H-pyran-4-yl acetate

Molecular formula:

C12H22O3

IUPAC Name:

(3S,4S)-3-pentyltetrahydro-2H-pyran-4-yl acetate

Constituent 2

Reference substance name:

(3R,4S)-3-pentyltetrahydro-2H-pyran-4-yl acetate

Molecular formula:

C12H22O3

IUPAC Name:

(3R,4S)-3-pentyltetrahydro-2H-pyran-4-yl acetate

Test material form:

liquid

Test animals

Species:

rabbit

Strain:

New Zealand White

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Suitable licensed dealer
- Age at study initiation: 3 months
- Weight at study initiation: approximately 2 kg
- Housing: Animals were housed in galvanized or stainless steel cages
- Diet: Free access to diet consisted of a growth and maintenance ration from a commercial producer
- Water: Free access to water.
- Acclimation period: at least 4 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): temperature controlled
- Humidity (%): no data
- Air changes (per hr): no data
- Photoperiod (hrs dark / hrs light): 12/12

Test system

Type of coverage:

occlusive

Preparation of test site:

clipped

Vehicle:

unchanged (no vehicle)

Controls:

not specified

Amount / concentration applied:

TEST MATERIAL
- Amount applied: 0.5 mL

Duration of treatment / exposure:

24 hours

Observation period:

72 hours

Number of animals:

6

Details on study design:

TEST SITE:
Approximately 24 hours before treatment, animals were prepared for testing by close-clipping the skin of the mid-dorsal area of the trunk, between the scapulae and the pelvis, using a small animal clipper equipped with a #40 (surgical) head.

TREATMENT
Two sites, each 2.5 cm square, were chosen on opposite sides of the vertebral column. The test site on the left side of the animal remained intact; the test site on the right was further prepared by abrading with a sterile 22 gauge hypodermic needle. The abrasions were longitudinal epidermal incisions, sufficiently deep to penetrate the stratum corneum, but not so deep as to destroy the integrity of the derma, i.e., to cause bleeding. A single application of the test substance was made to each test site. The test substance was then covered with a 5 cm2 surgical gauze pad, and the latter held in place with adhesive tape. After both sites were treated, the entire trunk of each animal was encased in an impermeable occlusive wrapping fixed in place with adhesive tape.

REMOVAL OF TEST SUBSTANCE
Twentyfour hours after the application, the wrapping and test substance was removed and the remaining test substance was gently wiped from the skin.

OBSERVATIONS
- Irritation: The skin reactions were assessed at 24 and 72 hours after the removal of the dressings and test substance. The irritation scores and a description of all other (local) effects were recorded.

SCORING SYSTEM:
The irritation was assessed according to the Draize skin scoring table. Following the 72 hour reading, the mean scores for 24 and 72 hour gradings were averaged to determine the primary skin irritation index. A score of 5.0 or more indicates a primary dermal irritant.

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

erythema score

Remarks:

non-abraded skin

Basis:

animal: #1, #2, #3, #4, #5 and #6

Time point:

other: 24 hours (mean)

Score:

1

Max. score:

4

Reversibility:

no data

Results 2

Irritation parameter:

erythema score

Remarks:

abraded skin

Basis:

animal: #1, #2, #3, #4, #5 and #6

Time point:

other: 24 hours (mean)

Score:

1

Max. score:

4

Reversibility:

no data

Results 3

Irritation parameter:

erythema score

Remarks:

non-abraded skin

Basis:

animal: #1, #2, #3, #4, #5 and #6

Time point:

other: 72 hours (mean)

Score:

0.5

Max. score:

4

Reversibility:

no data

Results 4

Irritation parameter:

erythema score

Remarks:

abraded skin

Basis:

animal: #1, #2, #3, #4, #5 and #6

Time point:

other: 72 hours (mean)

Score:

0.8

Max. score:

4

Reversibility:

no data

Results 5

Irritation parameter:

edema score

Remarks:

non-abraded skin

Basis:

animal: #1, #2, #3, #4, #5 and #6

Time point:

other: 24 hours (mean)

Score:

0.2

Max. score:

4

Reversibility:

fully reversible within: 72 hours

Results 6

Irritation parameter:

edema score

Remarks:

abraded skin

Basis:

animal: #1, #2, #3, #4, #5 and #6

Time point:

other: 24 hours (mean)

Score:

0.3

Max. score:

4

Reversibility:

fully reversible within: 72 hours

Results 7

Irritation parameter:

edema score

Remarks:

non-abraded and abraded skin

Basis:

animal: #1, #2, #3, #4, #5 and #6

Time point:

other: 72 hours (mean)

Score:

0

Max. score:

4

Irritant / corrosive response data:

The substance caused erythema effects (very slight) 24 and 72 hours after treatment in all animals. The erythema effects were not fully reversible within 72 hours of observation. The observed edema effects were fully reversible 72 hours after treatment.
See section any other information on results incl. tables for the individual skin irritation scores.

Any other information on results incl. tables

Individual skin irritation response data (for the undiluted test substance):

		24 hours		72 hours
Rabbit no.	Skin	Erythema	Edema	Erythema	Edema
1	NA	1	0	1	0
	A	1	0	1	0
2	NA	1	1	1	0
	A	1	1	1	0
3	NA	1	0	0	0
	A	1	1	1	0
4	NA	1	0	0	0
	A	1	0	0	0
5	NA	1	0	0	0
	A	1	0	1	0
6	NA	1	0	1	0
	A	1	0	1	0
Average	NA	1	0.2	0.5	0
	A	1	0.3	0.8	0

NA: Non-abraded skin

A: Abraded skin

Combined averages: 3.8

Primary irritation index: 0.95

Applicant's summary and conclusion

Interpretation of results:

other: not skin irritating

Remarks:

According to CLP 1272/2008 and its amendments

Conclusions:

In a skin irritation study with rabbits, performed equivalent to OECD 404 (1981) guideline and GLP principles. The exposure time was 24 hours. The erythema scores decreased from score 1 to score 0.5 within 72 hours of observation. The observed edema effects were fully reversible 72 hours after treatment. Despite the observation period not being extended to see the full reversibility of the effects, the erythema are very slight and therefore not considered for classification and labelling.

Executive summary:

The substance was tested in a skin irritation test in 6 rabbits equivalent with OECD TG 404 (1981) test guideline. The volume added to 5 cm2 was 0.5 ml and the exposure was 24 hours instead of 4hours. The skin irritation was scored at 24 and 72 hours only. In non-abraded skin, the average scores for edema and oedema decreased from 1 and 0.5, respectively at 24 hours to average 0.5 and 0, respectively at 72h indicating recovery. In view of the low scores at the 72h observation period no classification and labelling is needed&L is needed. Also because at the end of the 72 observation period 2/6 animals had no effects and 4/6 animals presented <= 1 erythema. In absence of alopecia, hyperkeratosis, hyperplasia and scaling the effects the scores are considered too minimal for C&L, despite full recovery after 14 days was not measured.