Nonanoic acid, esters with adipic acid and trimethylolpropane

Acute Toxicity: dermal

Administrative data

Endpoint:

acute toxicity: dermal

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2014

Report date:

2014

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 402 (Acute Dermal Toxicity)

Test guideline 2

Qualifier:

according to guideline

Guideline:

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

GLP compliance:

yes

Test type:

standard acute method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

2-ethyl-2-[[(1-oxononyl)oxy]methyl]propane-1,3-diyl dinonan-1-oate

EC Number:

204-793-6

EC Name:

2-ethyl-2-[[(1-oxononyl)oxy]methyl]propane-1,3-diyl dinonan-1-oate

Cas Number:

126-57-8

Molecular formula:

C33H62O6

IUPAC Name:

2,2-bis[(nonanoyloxy)methyl]butyl nonanoate (non-preferred name)

Constituent 2

Reference substance name:

Nonanoic acid, 1,1’-[2-ethyl-2-[[(1- oxononyl)oxy)methyl]-1,3-propanediyl] ester

IUPAC Name:

Nonanoic acid, 1,1’-[2-ethyl-2-[[(1- oxononyl)oxy)methyl]-1,3-propanediyl] ester

Test animals

Species:

rat

Strain:

Sprague-Dawley

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Harlan Italy s.r.l., San Pietro al Natisone (UD), Italy
- Females nulliparous and non-pregnant: yes
- Age at study initiation: 6 to 8 weeks old
- Weight at study initiation: 176 to 200 g
- Housing: Up to 5 of one sex to a cage. Clear polysulphone H-Temp solid bottomed cages (Techniplast Gazzada S.a.r.l., Buguggiate, VA, Italy) during acclimatisation period and during the study with stainless steel mesh lid and floor.
- Diet: 4 RF 18 (Mucedola S.r.l., Via G. Galilei, 4, 20019, Settimo Milanese (MI) Italy), ad libitum
- Water: drinking water supplied to each cage via a water bottle, ad libitum
- Acclimation period: at least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22 ± 2
- Humidity (%): 55 ± 15
- Air changes (per hr): approximately 15 to 20
- Photoperiod (hrs dark / hrs light): 12/12

Administration / exposure

Type of coverage:

semiocclusive

Details on dermal exposure:

Selection/Allocation:
Random at arrival. The body weight of each individual was within 20% of the mean and within the range of 200 - 300 g. Animals were unequivocally numbered within the study. The animal number together with the study number ensured a unique animal numbering for any study employing computerised data collection.

Animal identification:
Animals were permanently identified, following arrival, by a combination of ear notch (units) and tattoo on the hind feet. Males and females were
identified by even and odd numbers, respectively.

Frequency of treatment:
Animals were dosed once only on Day 1.

Treatment area preparation:
On the day before dosing (Day –1), a single area was clipped free of hair (by an electric clipper equipped with a suitable blade) on the dorsal surfaces of the trunk of each animal (approximately 10% of body surface). Care was taken to avoid damage to the skin.

Dose calculation:
On the day of dosing (Day 1), the aliquots were weighed according to the body weight of each animal measured prior to dosing.

Dosing procedure:
An aliquot of the supplied test item was spread evenly over an area of approximately 10% of the body surface area. A patch of surgical gauze
covered by a strip of synthetic film was placed over the treated site and the whole assembly held in place by encircling the trunk of the animal with a
length of elastic adhesive bandage, this forming a semi-occlusive barrier.

Washing procedure
After exposure, the adhesive bandage and gauze patch were removed. The treatment area was cleaned by gentle swabbing of the skin with cotton wool soaked with lukewarm water.

Duration of exposure:

24 hours

Doses:

2000 mg/kg bw

No. of animals per sex per dose:

A single group of 5 male and 5 female animals was dosed at a level of 2000 mg/kg.

Control animals:

not required

Details on study design:

In vivo observations

Mortality and morbidity:
Throughout the study all animals were checked twice daily.

Clinical signs:
Animals were observed for clinical signs as indicated below (and daily after a total of 14 days)

Day of dosing
– Session 1: on dosing
– Session 2: approximately 1 hour after dosing
– Session 3: 2 hours after dosing
– Session 4: 4 hours after dosing

Body weight
All animals were weighed at allocation to the study (Day -1), on the day of dosing (Day 1) and on Days 8 and 15. Body weight change calculated for Days 8 and 15 of the dosing phase was relevant to Day 1 of the phase.

Results and discussion

Effect levels

Key result

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

No mortality occurred in male or female animals during the observation period.

Clinical signs:

other: No signs of toxicity were observed in male or female animals during the observation period.

Gross pathology:

No abnormalities were found at necropsy in the animals at termination of the study, nor at the treated site.

Applicant's summary and conclusion

Interpretation of results:

other: CLP/EU GHS criteria not met, no classification required according to Regulation(EC) No. 1272/2008

Conclusions:

CLP: not classified

These results indicate that the test item, Trimethylolpropane Tripelargonate, has no toxic effect on the rat following dermal exposure over a 24 hour period at a level of 2000 mg/kg bw. The dermal LD50 of Trimethylolpropane Tripelargonate was determined to be > 2000 mg/kg bw.

Executive summary:

The acute toxicity of Trimethylolpropane Tripelargonate was investigated following dermal administration of a single dose to the rat. A single dose of 2000 mg/kg was administered to a group of 5 male and 5 female animals for 24 hours. After 14 days, all animals were killed and subjected to necropsy examination. No mortality occurred and no signs of toxicity were observed in male or female animals during the observation period. The body weight changes observed during the study were within the expected range for this species and age of animals. No abnormalities were found at necropsy in the animals at termination of the study, nor at the treated site. These results indicate that the test item, Trimethylolpropane Tripelargonate, has no toxic effect on the rat following dermal exposure over a 24 hour period at a level of 2000 mg/kg. The lack of mortality demonstrates the LD50 to be greater than 2000 mg/kg