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Toxicological information

Acute Toxicity: oral

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Administrative data

Endpoint:
acute toxicity: oral
Type of information:
migrated information: read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Study period:
Start : 17 April 2013 Completion : 03 May 2013
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: GLP guideline study without deficiencies. The study was conducted on a close structural analog of alkyl naphthalene.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2013
Report Date:
2013

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Test type:
acute toxic class method
Limit test:
yes

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
liquid: viscous
Details on test material:
Identification: Alkylated Naphthalene
Description: Clear amber slightly viscous liquid
Batch: 18515
Purity/Composition: UVCB 100%

Test animals

Species:
rat
Strain:
Wistar
Sex:
female
Details on test animals and environmental conditions:
6 Females (nulliparous and non-pregnant) were used. Each dose group consisted of 3 animals.
Animals were young adult animals (approx. 10 weeks old).
Body weight variation did not exceed +/- 20% of the sex mean.
Identification was by Earmark and tail mark.
Health inspections were conducted at least prior to dosing. It was ensured that the animals were healthy and without any abnormality that might affect the study integrity.

Animal husbandry
Conditions:
Environmental controls for the animal room were set to maintain 18 to 24 °C, a relative humidity of 40 to 70%, approximately 15 room air changes/hour, and a 12-hour light/12-hour dark cycle.

Accommodation:
Group housing of 3 animals per cage in labeled Makrolon cages (MIV type; height 18 cm.) containing sterilized sawdust as bedding material (Litalabo, S.P.P.S., Argenteuil, France) and paper as cage-enrichment (Enviro-dri, Wm. Lillico & Son (Wonham Mill Ltd), Surrey, United Kingdom).
Acclimatization period was at least 5 days before start of treatment under laboratory conditions.

Diet:
Free access to pelleted rodent diet (SM R/M-Z from SSNIFF® Spezialdiäten GmbH, Soest, Germany).

Water:
Free access to tap water.

Administration / exposure

Route of administration:
oral: gavage
Vehicle:
unchanged (no vehicle)
Details on oral exposure:
Method: Oral gavage, using plastic feeding tubes.
Fasting: Animals were deprived of food overnight prior to dosing and until 3-4 hours after administration of the test substance. Water was available ad libitum.
Frequency: Single dosage on Day 1.
Dose level (volume): 2000 mg/kg (2.273 mL/kg) body weight.
Dose volume calculated as dose level (g/kg) / specific gravity.
Doses:
Single dose at 2000 mg/kg
No. of animals per sex per dose:
Two groups of 3 females received the test material at 2000 mg/kg body weight.
Control animals:
no
Details on study design:
Observations:

Mortality/Viability - Twice daily.
Body weights - Days 1 (pre-administration), 8 and 15.
Clinical signs - At periodic intervals on the day of dosing (Day 1) and once daily thereafter, until Day 15. The symptoms were graded according to fixed scales and the time of onset, degree and duration were recorded:
Maximum grade 4: grading slight (1) to very severe (4)
Maximum grade 3: grading slight (1) to severe (3)
Maximum grade 1: presence is scored (1).
Necropsy - At the end of the observation period, all animals were sacrificed by oxygen/carbon dioxide procedure and subjected to necropsy. Descriptions of all internal macroscopic abnormalities were recorded.
Statistics:
The oral LD50 value of the test substance was ranked within the following ranges: 0-5, 5-50, 50-300 or 300-2000 mg/kg b.w. or as exceeding 2000 mg/kg b.w. The LD50 cut-off value was established based on OECD guideline 423. No statistical analysis was performed (The method used is not intended to allow the calculation of a precise LD50 value).

Results and discussion

Preliminary study:
LD50 greater than 5000 mg/kg.
No mortality observed at a dose of 2000 mg/kg in 6 treated female rats.
Effect levels
Sex:
female
Dose descriptor:
LD50
Effect level:
> 5 000 mg/kg bw
Based on:
test mat.
Mortality:
None observed.
Clinical signs:
Hunched posture was seen in three females on Days 1 and/or 2.
Body weight:
The weight gain shown by the animals over the study period was considered to be similar to that
expected of normal untreated animals of the same age and strain.
Gross pathology:
No abnormalities were found at macroscopic post mortem examination of the animals.

Applicant's summary and conclusion

Interpretation of results:
not classified
Remarks:
Migrated information According to the OECD 423 test guideline, the LD50 cut-off value was considered to exceed 5000 mg/kg body weight. Based on these results, the test substance does not have to be classified Criteria used for interpretation of results: EU
Conclusions:
The oral LD50 value of alkylated naphthalene in Wistar rats was established to exceed 2000 mg/kg body weight.
According to the OECD 423 test guideline, the LD50 cut-off value was considered to exceed 5000 mg/kg body weight.
Based on these results, alkylated naphthalene does not have to be classified and has no obligatory labelling requirement for acute oral toxicity according to the Globally Harmonized System of Classification and Labelling of Chemicals (GHS) of the United Nations (2011) and Regulation (EC) No 1272/2008 on classification, labelling and packaging of substances and mixtures.
Executive summary:

An assessment of acute oral toxicity with Alkylated naphthalene was conducted in the rat (Acute Toxic Class Method). The study was carried out based on the guidelines described in: OECD No.423 (2001) "Acute Oral Toxicity, Acute Toxic Class Method" Commission Regulation (EC) No 440/2008, B1 tris: "Acute Oral Toxicity, Acute Toxic Class Method" EPA, OPPTS 870.1100 (2002), "Acute Oral Toxicity" JMAFF guidelines (2011) including the most recent partial revisions.

Alkylated naphthalene was administered by oral gavage to two subsequent groups of three female Wistar rats at 2000 mg/kg body weight. Animals were subjected to daily observations and weekly determination of body weight. Macroscopic examination was performed after terminal sacrifice (Day 15).

No mortality occurred. Hunched posture was seen in three females on Days 1 and/or 2. The weight gain shown by the animals over the study period was considered to be similar to that expected of normal untreated animals of the same age and strain. No abnormalities were found at macroscopic post mortem examination of the animals. The oral LD50 value of Alkylated naphthalene in Wistar rats was established to exceed 2000 mg/kg body weight. According to the OECD 423 test guideline, the LD50 cut-off value was considered to exceed 5000 mg/kg body weight. Based on these results, alkylated naphthalene does not have to be classified and has no obligatory labelling requirement for acute oral toxicity according to the Globally Harmonized System of Classification and Labelling of Chemicals (GHS) of the United Nations (2011) and Regulation (EC) No 1272/2008 on classification, labelling and packaging of substances and mixtures.