cyclohexylmethyl biphenyl-4-ylacetate

Endpoint summary

Description of key information

Oral LD50 (rat): > 2000 mg/kg bw

Key value for chemical safety assessment

Acute toxicity: via oral route

Link to relevant study records

Reference

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

March - June 2015

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP study following OECD method without significant deviations

Qualifier:

according to guideline

Guideline:

OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method B.1 tris (Acute Oral Toxicity - Acute Toxic Class Method)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test type:

acute toxic class method

Limit test:

yes

Species:

rat

Strain:

Wistar

Sex:

female

Details on test animals or test system and environmental conditions:

Species: Rat, Wistar strain Crl:WI (Han) (outbred, SPF-Quality). Recognized by international guidelines as the recommended test system (e.g. OECD,
EC).
Source: Charles River Deutschland, Sulzfeld, Germany.
Number of animals: 6 Females (nulliparous and non-pregnant). Each dose group consisted of 3 animals.
Age and body weight: Young adult animals (approx. 10-11 weeks old) were selected. Body weight variation did not exceed +/- 20% of the sex mean.
Identification: Earmark and tail mark
Health inspection: At least prior to dosing. It was ensured that the animals were healthy and without any abnormality that might affect the study integrity.
Environmental conditions: Environmental controls for the animal room were set to maintain 18 to 24 °C, a relative humidity of 40 to 70%, at least 10 air changes/hour, and a 12-hour light/12-hour dark cycle. Any variations to these conditions were maintained in the raw data and had no effect on the outcome of the study.
Accommodation: Group housing of 3 animals per cage in labeled Makrolon cages (MIV type; height 18 cm.) containing sterilized sawdust as bedding material (Lignocel S 8-15, JRS - J.Rettenmaier & Söhne GmbH + CO. KG, Rosenberg, Germany) 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.
Diet, water, bedding and cage enrichment evaluation for contaminants and/or nutrients was performed according to facility standard procedures. There were no findings that could interfere with the study.

Route of administration:

oral: gavage

Vehicle:

propylene glycol

Details on oral exposure:

Animals received the test substance by oral gavage, using plastic feeding tubes. The test item preparations were stirred on a magnetic stirrer during dosing. 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. One single dosage on Day 1 was applied at dose level (volume) 2000 mg/kg (10 mL/kg) body weight.

Doses:

dose level (volume) 2000 mg/kg (10 mL/kg) body weight.

No. of animals per sex per dose:

2 times 3 females

Control animals:

other: not required for toxic class method

Details on study design:

The following observations were scheduled during the study:
Mortality/Viability: Twice daily.
Body weights: On 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 signs 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.
Observations/measurements in the study were recorded electronically using the following programs:
REES Centron Environmental Monitoring system version SQL 2.0 (REES scientific, Trenton, NJ, USA); TOXDATA version 8.0 (WIL Research Europe B.V., ‘s-Hertogenbosch, The Netherlands): Clinical signs, Body weights.

Statistics:

none, as non-applicable to toxic class method

Sex:

female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

No mortality occurred.

Clinical signs:

Hunched posture and/or piloerection were noted for the animals between Days 1 and 3.

Body weight:

The body weight gain shown by the animals over the study period was considered to be similar to that expected for normal untreated animals of the same age and strain.

Gross pathology:

No abnormalities were found at macroscopic post mortem examination of the animals.

Other findings:

No other findings were reported.

The oral LD50 value of Ester G 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, Ester G 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) (including all amendments) and Regulation (EC) No 1272/2008 on classification, labelling and packaging of substances and mixtures (including all amendments).

Interpretation of results:

study cannot be used for classification

Remarks:

Migrated information

Conclusions:

The oral LD50 value of Ester G in Wistar rats was established to exceed 2000 mg/kg body weight.

Executive summary:

An assessment of acute oral toxicity with Ester G in the rat (Acute Toxic Class Method) 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 (2000), including the most recent revisions.

Ester G 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 and/or piloerection were noted for the animals between Days 1 and 3. The body weight gain shown by the animals over the study period was considered to be normal. Macroscopic examination of the animals did not reveal any test substance related abnormalities. The oral LD50 value of Ester G 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, Ester G 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) (including all amendments) and Regulation (EC) No 1272/2008 on classification, labelling and packaging of substances and mixtures (including all amendments).

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

LD50

Value:

2 000 mg/kg bw

Quality of whole database:

fully compliant GLP guideline study

Acute toxicity: via inhalation route

Endpoint conclusion

Endpoint conclusion:

no study available

Acute toxicity: via dermal route

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

An assessment of acute oral toxicity with Ester G in the rat (Acute Toxic Class Method) 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 (2000), including the most recent revisions.

Ester G 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 and/or piloerection were noted for the animals between Days 1 and 3. The body weight gain shown by the animals over the study period was considered to be normal. Macroscopic examination of the animals did not reveal any test substance related abnormalities. The oral LD50 value of Ester G 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.

Justification for classification or non-classification

Based on the results of an acute oral toxicity study (acute toxic class method), the substance 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) (including all amendments) and Regulation (EC) No 1272/2008 on classification, labelling and packaging of substances and mixtures (including all amendments). As the substance is solid and not a hydrocarbon, it is also not subject to classification for aspiration hazards.