ε-Caprolactone, oligomeric reaction products with propylidynetrimethanol

Endpoint summary

Description of key information

An acute oral toxicity study is available for CAPA 3050. A waiver is proposed for acute inhalation toxicity based on the availability of an acute oral toxicity study and the lack of potential exposure. A waiver is proposed for acute dermal toxicity based on the low acute oral toxicity of the substance (LD50 >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:

24 September to 8 October 1991

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method B.1 (Acute Toxicity (Oral))

GLP compliance:

yes

Test type:

standard acute method

Limit test:

yes

Species:

rat

Strain:

Wistar

Sex:

male/female

Details on test animals or test system and environmental conditions:

The animals were male and female SPF-derived Hsd/Cpb:WU Wistar rats, obtained from Harlan/CPC, The Netherlands. Male rats wereighed 175-200 g, and females weighed 150-175 g, on arrival. The rats were acclimatised for 5 days.The rats were housed in Macrolon cages in groups of 2 or 3. Standard laboratory diet (RHM-TM, Hope Farms, The Netherlands) was provided ad libitum, except for ca. 18.5 hours prior to dosing until 6 hours after dosing. Water was available ad libitum. The animal room was maintained at a temperature of 21-22°C, and a relative humidity of 50-70%. Artifical light was provided for 12 hours per day, and radio sound was provided for 24 hours per day. There were approximately 16 air changes per hour.Individuals were identified by dye markings on the fur.

Route of administration:

oral: gavage

Vehicle:

other: 1.25% tragacanth solution in distilled water

Details on oral exposure:

CAPA 305 was suspended in a 1.25% tragacanth solution in distilled water. The final concentration was 0.2 g/ml. Aliquots of the suspension with a volume of 10 ml/kg body weight were taken, equivalent to 2000 mg/kg, and were administered by stomach tube to fasted rats.

Doses:

2000 mg/kg

No. of animals per sex per dose:

Five males and five females

Control animals:

no

Details on study design:

The rats were observed immediately after dosing, and at 1.5, 3, 6 and 26 hours after application and thereafter on each day for 14 days.The rats were weighed on the day before dosing, at the day of dosing prior to dose administration, and at 2, 7 and 14 days after dosing.At the end of the observation period, the rats were sacrificed by ether inhalation and gross necropsy was performed.

Statistics:

A statistical analysis was not required.

Preliminary study:

A preliminary study was not reported.

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Remarks on result:

other: No mortality at the limit dose

Mortality:

No mortalities occurred during the 14 day observation period.

Clinical signs:

other: A slightly hunched posture and gait were observed in 4 out of 5 males and all females between 1.5 and 3 hours after dosing. Signs had completely disappeared by 26 hours after dosing.

Gross pathology:

One male rat had a slightly swollen liver. One female showed a dilated uterus, and in another female the lungs were noted to have the appearance of emphysema. No other abnormalities were noted.

Other findings:

No other findings reported.

Dilation of the uterus is considered to be a normal physiological process within the oestrus cycle, and was not thought to be related to treatment. The authors suggested that the emphysema could be a consequence of a slight misdosing, or a compound-related effect.

Interpretation of results:

not classified

Remarks:

Migrated informationCriteria used for interpretation of results: EU

Conclusions:

The 14 -day acute oral LD50 of CAPA 305 in rats was found to be >2000 mg/kg bw

Executive summary:

The acute oral toxicity of CAPA 3050 was assessed in 5 male and 5 female Wistar rats. A single oral dose of 2000 mg/kg of CAPA 305, suspended in a 1.25% tragacanth solution in distilled water, was administered via gavage. There were no mortalities during the 14 -day observation period. The only clinical signs noted were abnormal gait and posture, all signs had disappeared within 26 hours of dosing. Reduced weight gain (males) or a small body weight loss was noticed from Day 2 to 7 after dosing; normal body weight gains were observed during the second week of the observation period. Autopsy of the rats at the end of the observation period did not reveal macroscopic abnormalities that were considered treatment-related, with the possible exception of lungs with the appearance of emphysema observed in 1 female rat. Acute oral LD50 of CAPA 305 in rats was therefore found to be > 2000 mg/kg bw under the conditions of this study.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

LD50

Value:

2 000 mg/kg bw

Quality of whole database:

A guideline- and GLP-compliant study is available for the registered substance

Acute toxicity: via inhalation route

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

Acute oral toxicity

The acute oral toxicity of CAPA 3050 was assessed in a GLP study with 5 male and 5 female Wistar rats (Snoeji & Buse-Pot, 1992). A single oral dose of 2000 mg/kg bw of CAPA 305, suspended in a 1.25% tragacanth solution in distilled water, was administered via gavage. There were no mortalities during the 14 day observation period. The only clinical signs noted were abnormal gait and posture, all signs has disappeared within 26 of dosing. Reduced weight gain (males) or a small body weight loss was noticed from Day 2 to 7 after dosing; normal body weight gains were observed during the second week of the observation period. Autopsy of the rats at the end of the observation period did not reveal macroscopic abnormalities that were considered treatment-related, with the possible exception of lungs with the appearance of emphysema observed in 1 female rat. The acute oral LD₅₀of CAPA 305 in rats is > 2000 mg/kg.

Acute inhalation toxicity

A waiver is presented for acute inhalation toxicity, in line with the adaptations to the standard data requirements in Column 2 of Annex VIII of the REACH Regulation. The substance is a non-volatile liquid; a study of acute inhalation toxicity is therefore not required based on the physicochemical properties of the substance.

Acute dermal toxicity

A waiver is presented for acute dermal toxicity, in line woth REACH guidance, based on the absence of mortality and clinical signs seen in the acute oral toxicity study

Justification for classification or non-classification

Based on the results of the acute oral toxicity study, CAPA 3050 does not require classification according to the CLP Regulation.