Reaction mass of (3R)-3-[(1R)-1-ethoxyethoxy]-3-methylpent-1-en-4-yne and (3R)-3-[(1S)-1-ethoxyethoxy]-3-methylpent-1-en-4-yne and (3S)-3-[(1R)-1-ethoxyethoxy]-3-methylpent-1-en-4-yne and (3S)-3-[(1S)-1-ethoxyethoxy]-3-methylpent-1-en-4-yne

Endpoint summary

Description of key information

An oral LD50 between 200 - 2000 mg/kg was determined in an acute oral toxicity study (EU B1 method).

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

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP compliant guideline study, available as unpublished report, no restrictions, fully adequate for assessment

Qualifier:

according to guideline

Guideline:

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

GLP compliance:

yes

Test type:

acute toxic class method

Limit test:

no

Species:

rat

Strain:

Wistar

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Dr. K. Thomae Gmbh, Biberach, FRG
- Age at study initiation: young adults
- Weight at study initiation: 150 - 300 g
- Fasting period before study: 16 hours
- Housing: single housing; stainless stell wire mesh cages, type DK-III (Becker & Co., Castrop-Rauzel, FRG); no bedding in the cages; sawdust in the waste trays
- Diet: ad libitum, Kliba-labordiaet 343, Klingentalmuehle AG Kaiseraugst, Switzerland
- Water: ad libitum, tap water
- Acclimation period: at least 1 week

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 20 - 24
- Humidity (%): 30 - 70
- Air changes: fully air-conditioned rooms
- Photoperiod (hrs dark / hrs light): 12/12

Route of administration:

oral: gavage

Vehicle:

olive oil

Remarks:

DAB 10

Details on oral exposure:

VEHICLE
- Concentration in vehicle: 4 and 40 g/100 mL
- Amount of vehicle: 5 mL/kg
- Justification for choice of vehicle: the test substance was insoluble in water

CLASS METHOD
- Rationale for the selection of the starting dose: based on the physical and chemical characteristics of the test substance and the composition, no pronounced acute oral toxicity was expected. Therefore a starting dose of 2000 mg/kg bw was chosen as a first step.

Doses:

200 and 2000 mg/kg

No. of animals per sex per dose:

Experiment 1 (2000 mg/kg): 3 females
Experiment 2 (200 mg/kg): 3 females
Experiment 3 (200 mg/kg): 3 males

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: Individual body weights were determined shortly before administration (day 0), weekly thereafter and at the end of the study (before fasting period). A check concerning general observations and mortality was made twice each working day and once on weekends and on public holidays.
- Necropsy of survivors performed: yes. Withdrawal of food at least 16 hours before killing with CO2; then necropsy with gross-pathological examination.

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 200 - < 2 000 mg/kg bw

Based on:

test mat.

Mortality:

- All animals exposed to 2000 mg/kg died, within 1 day after exposure.
- No mortality observed in animals exposed to 200 mg/kg.

Clinical signs:

other: - Female animals exposed to 2000 mg/kg: A poor general state, dyspnea, apathy, and paresis were observed in all animals, between time of exposure and 4 hours after exposure. Atonia and erythema were observed in all animals, between 1 and 4 hours after exp

Gross pathology:

- Congestion agonal was observed in all female animals exposed to 2000 mg/kg
- No pathologic findings noted in all animals exposed to 200 mg/kg

Interpretation of results:

harmful

Remarks:

Migrated information

Conclusions:

Under the conditions of this study the oral LD50 in Wistar rats is between 200 and 2000 mg/kg bw.

Executive summary:

In GLP-compliant EU Method B1 guideline study modified according to the acute toxic class method , 3 female Wistar rats were exposed to 2000 mg/kg bw, and 3 male and 3 female Wistar rats were exposed via oral gavage to 200 mg/kg bw of the test substance dissolved in olive oil DAB. After an observation period of 14 days the surviving animals were necropsied. Several signs of toxicity were noted in the animals exposed to 2000 mg/kg bw, all of which died within 1 day. Gross pathology showed agonal congestion in these animals. No mortality was observed in animals exposed to 200 mg/kg bw. The LD50 was therefore determined to be between 200 and 2000 mg/kg bw.

Endpoint conclusion

Endpoint conclusion:

adverse effect observed

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

In GLP-compliant EU Method B1 guideline study modified according to the acute toxic class method, 3 female Wistar rats were exposed to 2000 mg/kg bw, and 3 male and 3 female Wistar rats were exposed to 200 mg/kg bw of the test substance dissolved in olive oil DAB via oral gavage (BASF 1994). After an observation period of 14 days the surviving animals were necropsied. Several signs of toxicity were noted in the animals exposed to 2000 mg/kg bw, all of which died within 1 day. Gross pathology showed agonal congestion in these animals. No mortality was observed in animals exposed to 200 mg/kg bw. The LD50 was therefore determined to be between 200 and 2000 mg/kg bw.

Justification for selection of acute toxicity – oral endpoint
One acute oral toxicity study is available. The study is adequate for covering this endpoint.

Justification for classification or non-classification

Based on an oral LD50 between 200 - 2000 mg/kg bw and in accordance with Directive 67/548/EEC (DSD) and EU Classification, Labeling and Packaging of Substances and Mixtures (CLP) Regulation (EC) No. 1272/2008,1-Penten-4-yne, 3-(1-ethoxyethoxy)-3-methyl- has to be classified as Xn:R22: Harmful if swallowed and Acute Tox. 4:H302: Harmful if swallowed, respectively.