2-Methyloctane-1,8-diamine

Endpoint summary

Description of key information

The acute lethal oral dose (LD₅₀) to mice for MODA was determined to be 500 mg/kg bw. No fatalities occurred at the lower dose of 250 mg/kg. Inhalation and dermal studies were not conducted due to the corrosive properties of the substance.
The data justify the classification according to Regulation (EC) No 1272/2008 as Acute Tox. 4 (oral); H302, harmful if swallowed.

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:

12th February 1996 to 5th March 1996

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Guideline cited only partially followed and study claims no compliance that it was conducted to the principles of Good Laboratory Practice.

Qualifier:

according to guideline

Guideline:

OECD Guideline 401 (Acute Oral Toxicity)

Version / remarks:

partial claim only

Deviations:

not specified

GLP compliance:

no

Test type:

standard acute method

Limit test:

no

Species:

mouse

Strain:

CD-1

Sex:

male

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Hino Breeding Center, Charles River, Japan.
- Age at study initiation: 6 weeks (arrived at 5 weeks of age but acclimatised for 8 days prior to study start)
- Weight at study initiation: Not reported
- Fasting period before study: overnight prior to dosing
- Housing: 5/cage in polycarbonate solid-floored cages with wood flakes (White Flake (TM), Oriental Yeast Co., Ltd)
- Diet (e.g. ad libitum): ad libitum
- Water (e.g. ad libitum): ad libitum
- Acclimation period: 8 days


ENVIRONMENTAL CONDITIONS
- Temperature (°C): 20 - 26 °C
- Humidity (%): 45 - 65%
- Air changes (per hr): ventilated at the rate of 15 times per hour
- Photoperiod (hrs dark / hrs light): 12hours light/12 hours dark


IN-LIFE DATES: From: 12th February 1996 To: 5th March 1996

Route of administration:

oral: gavage

Vehicle:

water

Details on oral exposure:

VEHICLE
- Concentration in vehicle: 12.5, 25, 50 & 100 mg/mL
- Amount of vehicle (if gavage): 0.1 / 10 g of bodyweight
- Justification for choice of vehicle: Not stated
- Lot/batch no. (if required): Not reported
- Purity: Not reported but distilled water used


MAXIMUM DOSE VOLUME APPLIED:
ca. 0.3 mL

DOSAGE PREPARATION (if unusual):


CLASS METHOD (if applicable)
- Rationale for the selection of the starting dose: N/A

Doses:

vehicle control (0 mg/kg); 125, 250, 500 & 1000 mg/kg

No. of animals per sex per dose:

5 males per dose group

Control animals:

yes

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: observed once in the morning and once in the evening from day of dosing to Day 13; bodyweights
recorded on Day 0 (prior to dosing) and on days 7 & 14
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight, macroscopic appearence

Statistics:

No statistical analyses waere performed

Preliminary study:

No preliminary study reported

Sex:

male

Dose descriptor:

LD50

Effect level:

> 500 < mg/kg bw

Mortality:

100% at 1000 mg/kg; 40% at 500 mg/kg; 0% at 250 mg/kg; 0% at 125 mg/kg; 0% for controls

Clinical signs:

other: No clinical signs are reported

Gross pathology:

All 5 mice that died by day 1 in the high level (1000 mg/kg) showed haemorrhage in the stomach and intestine at necropsy and 4 showed whitish
foci on the liver; 2 mice that died at the dose level 500 mg/kg (Days 1 & 2) showed whitish foci on the liver and 1 showed haemorrhage in the
stomach and intestine. There were no abnormal findings in the remaining animals which survived up to Day 14.

Other findings:

- Organ weights: Not recorded
- Histopathology: N/A
- Potential target organs: Not reported
- Other observations: N/A

Mortality of the mice that received the test substance and their macroscopic findings are summarized in Table 2 below. Lethal toxicity to the mice was observed at the doses of 500 and 100 mg/kg in the early period (Day 0-2) after dosing. Haemorrhage in the stomach and intestine was observed in the mice that died on Day 0-1, and whitish foci were found on the liver of the mice that died on Day 1-2. Macroscopic abnormalities were not found in the mice that survived to the end of the study (Day 14).

Bodyweight gain during the study was suppressed at the dose level of 500 mg/kg. Therefore, the acute lethal oral dose (LD50) to mice of the test substance was demonstrated to be greater than 250 and less than 1000 mg/kg in this study.

Table 2.

Mortality after dosing of 2-methyl-1,8-octanediamine and macroscopic organ findings in mice that died during the observation period or killed at study termination

Group [No. of mice dosed]	Dose (mg/kg)	Mortality data	Organ findings [No. of mice showed the finding]	% Mortality
A [5]	1000	A mouse died on Day 0 (the day of dosing)	Haemorrhage in stomach and intestine [1]	100
		Four mice died on Day 1	Haemorrhage in stomach and intestine [4]; whitish foci on liver [4]
		No mouse survived to Day 14	-
B [5]	500	A mouse died on Day 1	Haemorrhage in stomach and intestine [1]; whitish foci on liver [1]	40
		A mouse died on Day 2	Whitish foci on liver [1]
		Three mice survived up to Day 14	No abnormal findings [3]
C [5]	250	All mice survived to Day 14	No abnormal findings [5]	0
D [5]	125	All mice survived to Day 14	No abnormal findings [5]	0
E [5]	0 (vehicle control)	All mice survived to Day 14	No abnormal findings [5]	0

Conclusions:

When administered orally to male mice, the lethal dose (LD50) of 2-methyl -1,8-octanediamine was found to be greater than 250 and less than 1000 mg/kg. A LD50 value of 500 mg/kg was taken as effect level based on the observed 50% survival rate at this dose level.

Executive summary:

A study was conducted by Kuraray Co. Ltd., at their Kurashi Research Laboratories, Japan to evaluate the acute oral toxicity of the substance 2 -methyl-1,8 -octanediame (MODA) to mice. The study was only partially conducted according to OECD Guideline No. 401 and has no claim of compliance to the principles of GLP. However, the study is quite well documented and appears to meet basic scientific principles. Groups of 5 male mice were each given a single oral dose of the substance at dose levels of vehicle only and at 125, 250, 500 or 1000 mg /kg. Lethal toxicity was found at the dose levels of 500 and 1000 mg/kg. A decrease in bodyweight gain was observed in the mice dosed at 500 mg/kg. No abnormalities were found in the mice dosed at 125 or 250 mg/kg throughout the study. The acute lethal oral dose (LD50) to mice for MODA was determined to be 500 mg/kg bw.

 

Endpoint conclusion

Endpoint conclusion:

adverse effect observed

Dose descriptor:

LD50

Value:

500 mg/kg bw

Acute toxicity: via inhalation route

Endpoint conclusion

Endpoint conclusion:

no study available

Acute toxicity: via dermal route

Endpoint conclusion

Endpoint conclusion:

no study available

Value:

mg/kg bw

Additional information

The key acute oral study, conducted in similar to OECD 401, involved gavage administration. Male mice received a single oral gavage dose of the test substance at a dose level of 125, 250, 500 or 1000 mg/kg bodyweight, and were observed for 14 days after dosing. Lethal toxicity was found at the dose levels of 500 and 1000 mg/kg. Hemorrhage in stomach and intestine was observed in the mice that died on Day 0 – 1, and whitish foci were found on the liver of the mice which died on Day 1 – 3. No abnormalities were found in the mice dosed at 125 or 250 mg/kg throughout the study. The acute lethal oral dose (LD50) of the test substance was estimated to be greater than 250 and less than 1000 mg/kg. A LD50 value of 500 mg/kg was taken as effect level based on the observed 50% survival rate at this dose level.

Justification for selection of acute toxicity – oral endpoint
valid study with Klimisch 2 rating. No further studies were carried out due to highly corrosive proerties of the substance.

LD50 (500 mg/kg/) for mouse has been accepted in place of rat for the purposes of classification. Reasons for this are:

i) To reduce the numbers of animals used for toxicity testing as the substance is corrosive.

ii) Current acute oral test methods allow the use of the mouse as an alternative rodent species (e.g. OECD Methods 420, 423 and 425).

iii) A sub-chronic toxicity study is available (28-day on rats) that triggers the same classification (H302)

 

Justification for classification or non-classification

LD50 500 mg/bw meets the criteria for classification as H302: Harmful if swallowed according to CLP / GHS