2-ethylhexyl 14-ethyl-6,6-dioctyl-4,8,11-trioxo-5,7,12-trioxa-6-stannaoctadeca-2,9-dienoate

Acute Toxicity: dermal

Administrative data

Endpoint:

acute toxicity: dermal

Type of information:

other: read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Study period:

June 13th to July 4th, 2012

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Remarks:

Reliability of original study is 1

Justification for type of information:

Justification for Read Across is given in Section 13 of IUCLID.

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 402 (Acute Dermal Toxicity)

Deviations:

yes

Remarks:

Due to a technical error, the day 3 clinical observations for two females were not recorded. This deviation was considered not to affect the integrity of the study.

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.3 (Acute Toxicity (Dermal))

Deviations:

yes

Remarks:

Due to a technical error, the day 3 clinical observations for two females were not recorded. This deviation was considered not to affect the integrity of the study.

GLP compliance:

yes (incl. QA statement)

Test type:

standard acute method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Ethyl 9,9-dioctyl-4,7,11-trioxo-3,8,10-trioxa-9-stannatetradeca-5,12-dien-14-oate

EC Number:

268-500-3

EC Name:

Ethyl 9,9-dioctyl-4,7,11-trioxo-3,8,10-trioxa-9-stannatetradeca-5,12-dien-14-oate

Cas Number:

68109-88-6

Molecular formula:

C28H48O8Sn

IUPAC Name:

Ethyl-9,9-dioctyl-4,7,11-trioxo-3,8,10-trioxa-9-stannatetradeca-5,12-dien-14-oate

Test animals

Species:

rat

Strain:

Wistar

Remarks:

RccHan:WIST

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Harlan Laboratories UK Ltd., Oxon., UK
- Age at study initiation: 8 - 12 weeks.
- Weight at study initiation: at least 200 g.
- Housing: animals were housed individually during the 24 hour exposure period and in groups of up to 4, by sex, for the remainder of the study in suspended solid-floor polypropylene cages furnished with woodflakes.
- Diet: rodent diet (2014C Teklad Global Rodent diet, supplied by Harlan Laboratories UK Ltd., Oxon., UK), ad libitum.
- Water: mains water, ad libitum.
- Acclimation period: at least 5 days.

ENVIRONMENTAL CONDITIONS
- Temperature: 19 - 25 °C.
- Humidity: 30 - 70 %.
- Air changes: at least 15 changes per hour.
- Photoperiod: 12 hrs dark / 12 hrs light.

IN-LIFE DATES: from 13 June 2012 to 4 July 2012.

Administration / exposure

Type of coverage:

semiocclusive

Vehicle:

arachis oil

Details on dermal exposure:

TEST SITE
- Preparation for exposure: on the day before treatment the back and flanks of each animal were clipped free of hair.
- % coverage: approximately 10 % of the total body surface area.
- Type of wrap if used: a piece of surgical gauze was placed over the treatment area and semi-occluded with a piece of self-adhesive bandage.

REMOVAL OF TEST SUBSTANCE: after the 24 hour contact period the bandage was carefully removed and the treated skin and surrounding hair wiped with cotton wool moistened with arachis oil BP to remove any residual test material

TEST MATERIAL: the appropriate amount of test material was moistened with arachis oil BP and applied as evenly as possible to the area of shorn skin

Duration of exposure:

24 hours

Doses:

2000 mg/kg

No. of animals per sex per dose:

5 males and 5 females

Control animals:

no

Details on study design:

In the absence of data suggesting the test material was toxic, one male and one female rat were initially treated with the test material at a dose level of 2000 mg/kg bodyweight. As no mortalities were noted, a further group of 4 male and 4 female animals were similarly treated at a dose level of 2000 mg/kg bodyweight to bring the total of each sex to 5.
- Duration of observation period following administration: 14 days.
- Frequency of observations and weighing: animals were observed for deaths and overt signs of toxicity 0.5, 1, 2 and 4 hours after dosing and once daily thereafter. The test site was observed daily for evidence of primary irritation and scored according to Draize. Individual bodyweights were recorded prior to application of the test material on day 0 and on days 7 and 14.
- Necropsy of survivors performed: yes. Animals were killed by cervical dislocation. All animals were subjected to gross necropsy, consisting of an external examination and opening of the abdominal and thoracic cavities. The appearance of any macroscopic abnormalities was recorded. No tissues were retained.

Results and discussion

Effect levels

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

There were no deaths during the study.

Clinical signs:

No signs of systemic toxicity were noted during the study.

Body weight:

One female showed bodyweight loss during the first week but expected gain in bodyweight during the second week and one female showed expected gain in bodyweight during the first week but bodyweight loss during the second week. Remaining animals showed expected gains in bodyweight over the study period.

Gross pathology:

No abnormalities were noted at necropsy.

Other findings:

Signs of dermal irritation noted were very slight erythema, crust formation and desquamation. There were no signs of dermal irritation noted at the test site of one male.

Any other information on results incl. tables

Table: individual dermal reactions

Animal no. and sex	Observation	Effects noted after initiation of exposure (days)
		1	2	3	4	5	6	7	8	9	10	11	12	13	14
1 -0 M	Erythema	1	1	1	1	1	1	0	0	0	0	0	0	0	0
	Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	Other	0	0	0	0	D	D	D	Cf	Cf	Cf	Cf	D	D	0
3 -0 M	Erythema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	Other	0	0	0	0	0	0	0	0	0	0	0	0	0	0
3 -1 M	Erythema	1	0	1	1	0	0	0	0	0	0	0	0	0	0
	Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	Other	0	0	0	0	D	D	0	0	0	0	0	0	0	0
3 -2 M	Erythema	1	0	0	0	0	0	0	0	0	0	0	0	0	0
	Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	Other	0	0	0	0	0	0	0	0	0	0	0	0	0	0
3 -3 M	Erythema	1	0	0	0	0	0	0	0	0	0	0	0	0	0
	Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	Other	0	0	0	0	D	D	0	0	0	0	0	0	0	0
2 -0 F	Erythema	1	1	0	0	0	0	0	0	0	0	0	0	0	0
	Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	Other	0	0	0	0	0	0	0	0	0	0	0	0	0	0
4 -0 F	Erythema	1	0	0	0	1	1	0	0	0	0	0	0	0	0
	Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	Other	0	0	0	0	D	D	D	0	0	0	0	0	0	0
4 -1 F	Erythema	1	0	1	1	1	1	0	0	0	0	0	0	0	0
	Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	Other	0	0	0	0	D	D	0	0	0	0	0	0	0	0
4 -2 F	Erythema	1	0	1	1	1	1	0	0	0	0	0	0	0	0
	Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	Other	0	0	0	0	D	D	0	0	0	0	0	0	0	0
4 -3 F	Erythema	1	1	1	1	1	1	1	0	0	0	0	0	0	0
	Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	Other	0	0	0	0	D	D	D	D	0	0	0	0	0	0

0 = no reactions

D = desquamation

Cf = crust formation

Table: Individual Bodyweights and Weekly Bodyweight Changes

Animal no. and sex	Bodyweight (g) at day			Bodyweight change (g) during week
	0	7	14	1	2
1 -0 M	350	361	376	11	15
3 -0 M	260	285	299	25	14
3 -1 M	255	276	299	21	23
3 -2 M	244	275	308	31	33
3 -3 M	234	256	289	22	33
2 -0 F	230	227	237	-3	10
4 -0 F	217	220	224	3	4
4 -1 F	200	210	218	10	8
4 -2 F	214	223	221	9	-2
4 -3 F	206	213	218	7	5

Applicant's summary and conclusion

Interpretation of results:

other: not classified as harmful/toxic according to the CLP Regulation (EC) No.1272/2008

Conclusions:

LD50 > 2000 mg/kg bw

Executive summary:

The acute dermal toxicity of the test material was investigated in accordance with the standardised guidelines OECD 402 and EU Method B.3. During the study, a group of ten animals (five males and five females) was given a single 24 hour, semi-occluded dermal application of the test material to intact skin clipped free of hair at a dose level of 2000 mg/kg bw. Clinical signs and bodyweight development were monitored during the study. All animals were subjected to gross necropsy.

During the study there were no deaths and no signs of systemic toxicity were observed. One female showed bodyweight loss during the first week but expected gain in bodyweight during the second week and one female showed expected gain in bodyweight during the first week but bodyweight loss during the second week. Remaining animals showed expected gains in bodyweight over the study period. Signs of dermal irritation noted were very slight erythema, crust formation and desquamation. There were no signs of dermal irritation noted at the test site of one male. No abnormalities were noted at necropsy.

LD50 > 2000 mg/kg bw