Diisopropyl succinate

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

April 1999 to July 1999

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP Study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1999

Report date:

1999

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.4 (Acute Toxicity: Dermal Irritation / Corrosion)

Deviations:

no

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Diisopropyl succinate

EC Number:

213-110-0

EC Name:

Diisopropyl succinate

Cas Number:

924-88-9

Molecular formula:

C10H18O4

IUPAC Name:

diisopropyl succinate

Details on test material:

Name "DIISOPROPYLSUCCINAT".
Chemical name Succinic acid diisopropyl ester.
Trade name DIPS.
CAS No. 924-88-9.
Batch No. EMBS 302.
Purity At least 99 %.
Density 0.9847.
Kp 247 °C.
Solubility in water Insoluble.
Storage In the refrigerator, in the dark.
Date of expiry June 1999.

Test animals

Species:

rabbit

Strain:

New Zealand White

Details on test animals or test system and environmental conditions:

Species and strain: Rabbits, New Zealand White.
Supplier: J. Schitkovits, A-2620 Natschbach.
Number and sex: 3 females.
Body weight (at the start and at the termination of the study):
Animal No. 41: 2.6 kg and 2.8 kg.
Animal No. 42: 2.6 kg and 2.8 kg.
Animal No. 43: 2.3 kg and 2.4 kg.

Hygiene: Optimal hygienic conditions.
Room number: EH1-17.
Room temperature: Average of 20 °C.
Relative humidity: Average of 52 %.
Air exchange: 12 per hour.
Light: Artificial light from 6 a.m. to 6 p.m.
Cages: Individual caging in metal wire cages, Ehret GmbH, D-79312 Emmendingen, type KK 016R, 79 cm x 59 cm x 35 cm.
Feed: Altromin 2023 diet for rabbits, ad libitum. Random samples of the feed are analysed for contaminants by Altromin, D-32791 Lage.
Water: Tap water from an automatic watering system, ad libitum.
Identification: Labelling with felt-tipped pen in a pinna.
Acclimatisation: 12 days.

Test system

Type of coverage:

semiocclusive

Preparation of test site:

other: clipped

Vehicle:

unchanged (no vehicle)

Controls:

not required

Amount / concentration applied:

0.5 mL per animal

Duration of treatment / exposure:

4 hours

Observation period:

1, 24, 48 and 72 hours after patch removal.

Number of animals:

3

Details on study design:

Hair was clipped on the dorsal area of the trunk one day before the application. An electric hair clipper, Aesculap GH 204, with a 1 mm cutterhead was used.
The test sites were located on the dorsal thoracal region.
Samples of 0.5 ml of the test substance were spread on cellulose patches 1) in a size of about 2.5 cm x 2.5 cm and were applied to the test sites. They were held in place by fixing them marginally with non irritating tapes 2). The application sites were covered semi-occlusively by a dressing 3).
Access by the animal to the application sites was prevented by a plastic collar.
The duration of exposure was 4 hours.
At the end of the exposure period the dressing, the tapes with the patches and the collar were removed, residual test substance was removed with wet Kleenex-tissues, if necessary.
1) Pur Zellin-Tupfer, obtained by Fa. Hartmann , A-2355 Wiener Neudorf.
2) "Blenderm ®" surgical tape, hypoallergenic, 3M, Medical Products Division, St. Paul, MN 551444, USA.
3) Self adhesive non woven fabric, hypoallergenic, made by Beiersdorf AG, D-20245 Hamburg.

The treated areas and the surrounding untreated skin (control area) of the animals were examined for erythema/eschar and oedema as well as for other local alterations approximately 1, 24, 48 and 72 hours after patch removal.
No examinations were performed thereafter.
The scores noted, 24, 48 and 72 h after the patch removal were decisive for the interpretation of the results and the conclusion.
The skin was examined using a cold light source KL 1500 electronic.
Dermal irritation was described and recorded according to the scoring scheme for acute dermal irritation/corrosion tests.

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

erythema score

Basis:

mean

Time point:

other: 1, 24, 48, 72 h

Score:

0

Max. score:

0

Reversibility:

other: not applicable

Results 2

Irritation parameter:

edema score

Basis:

mean

Time point:

other: 1, 24, 48, 72 h

Score:

0

Max. score:

0

Reversibility:

other: not applicable

Irritant / corrosive response data:

All areas to be treated with the test substance and all control areas were normal before the application and at each observation time.

Other effects:

None

Any other information on results incl. tables

	Mean Scores for Animal No.:
	41	42	43
Erythema / Eschar:	0.0	0.0	0.0
Oedema:	0.0	0.0	0.0

Applicant's summary and conclusion

Interpretation of results:

not irritating

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

As all areas treated with the test substance were normal before the application and at each observation time the test substance is not irritating to the skin.

Executive summary:

The aim of this study was to investigate possible irritation or corrosion by the test material following a single application to the intact skin of rabbits.

Methods

Methods and investigations were performed in conformance with the OECD Guideline 404 and the Directive 92/69/EEC, method B.4.

Administration of the test substance

0.5 ml"DIISOPROPYLSUCCINAT"was applied via a patch to a site of about 2.5 cm x 2.5 cm of the intact skin of each of 3 rabbits and covered by semi-occlusive dressing.

The duration of the exposure was 4 hours.

Investigations

·     Body weights: at the start and at the termination of the test.

·     General signs of toxicity: once daily.

·     Skin examination: 1, 24, 48 and 72 h after patch removal.

Results

General signs of toxicity

No general toxic effects were observed.

Skin examination

All exposed skin sites were normal at each examination term.

Conclusion

The following mean scores were calculated for each animal from the individual examinations performed 24 h, 48 h and 72 h p.a.:

 

	Mean Scores for Animal No.:
	41	42	43
Erythema / Eschar:	0.0	0.0	0.0
Oedema:	0.0	0.0	0.0

  

The test substance"DIISOPROPYLSUCCINAT"is therefore not irritating to the skin.