9-Decenoic acid, methyl ester

Endpoint summary

Description of key information

• Oral LD50 > 2000 mg/kg bodyweight (OECD 420)

• Dermal LD50 > 2000 mg/kg bodyweight (OECD 402)

• Inhalation: No studies are available

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:

2011-10-06 to 2011-11-03

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 420 (Acute Oral Toxicity - Fixed Dose Method)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

Date of inspection 2011-07-19 to 2011-07-21; Date of signature 2011-08-31

Test type:

fixed dose procedure

Limit test:

yes

Species:

rat

Strain:

Wistar

Sex:

female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Harlan Laboratories UK Ltd, Oxon, UK
- Age at study initiation: 8-12 weeks
- Weight at study initiation: 164 ± 20 %
- Fasting period before study: Overnight immediately prior to dosing and 3-4 hours after dosing
- Housing: Groups of up to four in suspended solid-floor polypropylene cages furnished with woodflakes.
- Diet: Free access to 2014C Teklad Global Rodent Diet supplied by Harlan Laboratories UK Ltd, Oxon, UK
- Water: Free access to mains drinking water
- Acclimation period: at least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature: 19 to 25 ºC
- Humidity: 30 to 70 %
- Air changes: At least 15
- Photoperiod: 12 hours light (06:00 to 18:00) and 12 hours dark controlled by a time switch

Route of administration:

oral: gavage

Vehicle:

arachis oil

Remarks:

300 mg/kg dose level

Details on oral exposure:

EXPERIMENTAL PREPARATION
- Specific gravity of the test material was determined and used to calculate the appropriate dose volume.
- The test material was formulated within two hours of being applied to the test system and it was assumed that the substance was stable for that period of time.
- No analysis was conducted to determine the homogeneity, concentration or stability of the test item formulation and that decision was noted in the GLP compliance statement.

Doses:

- Initial investigation: single dose of 300 mg/kg as a dose volume of 10 mL (30 mg/mL).
- Second investigation: single dose of 2000 mg/kg (2.26 mL/kg; specific gravity 0.885).
- Third investigation: single dose of 2000 mg/kg (2.26 mL/kg; specific gravity 0.885).

No. of animals per sex per dose:

- Initial investigation: one
- Second investigation: one
- Third investigation: four

Control animals:

no

Details on study design:

ANIMALS AND ANIMAL HUSBANDRY
- Animals were randomly allocated to cages on receipt.
- The females were nulliparous and non-pregnant.
- Animals were selected at random and given a number unique within the study by indelible ink marking on the tail and a number written on a cage card.
- Diet, drinking water and bedding were routinely analysed and were considered not to contain any contaminants that would reasonably be expected to affect the purpose or integrity of the study.
- Animals were provided with environmental enrichment items that were considered not to contain any contaminant at a level that could affect the purpose or integrity of the study.

PROCEDURE
- In the absence of data on test material toxicity, 300 mg/kg was chosen as the starting dose.
- In the absence of toxicity at a dose level of 300 mg/kg, an additional animal was treated.
- In the absence of mortality at a dose level of 2000 mg/kg, a further group of animals was treated.

Statistics:

- Data evaluations included the relationship, if any, between the animals' exposure to test material and the incidence and severity of all abnormalities including behavioural and clinical observations, gross lesions, bodyweight changes, mortality and any other toxicological effects.
- Motality data was used to obtain an estimate of the acute oral median lethal dose (LD50) of the test material.

Preliminary study:

- No toxicity was observed at a dose level of 300mg/kg

Sex:

female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

No mortality was observed at a dose level of 300 mg/kg or 2000 mg/kg

Clinical signs:

other: - No signs of clinical toxicity were noted during the observation period following treatment at 300 mg/kg or 2000 mg/kg

Gross pathology:

No abnormalities were noted at necropsy following dosing at 300 mg/kg and 2000 mg/kg

Interpretation of results:

GHS criteria not met

Remarks:

(EU CLP)

Conclusions:

The acute oral median lethal dose (LD50) of the test material in the female Wistar strain rat was estimated to be greater than 2000 mg/kg bodyweight.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

LD50

Value:

2 000 mg/kg bw

Acute toxicity: via inhalation route

Endpoint conclusion

Endpoint conclusion:

no study available

Acute toxicity: via dermal route

Link to relevant study records

Reference

Endpoint:

acute toxicity: dermal

Type of information:

experimental study

Adequacy of study:

key study

Study period:

18 January 2012 to 01 February 2012

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 402 (Acute Dermal Toxicity)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method B.3 (Acute Toxicity (Dermal))

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

Date of inspection 2011-07-19 to 2011-07-21; Date of signature 2011-08-31

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:

TEST ANIMALS
- Source: Harlan Laboratories UK Ltd., Oxon, UK
- Age at study initiation: 8-12 weeks
- Weight at study initiation: at least 200 g
- Fasting period before study: No data
- Housing: Animals were housed in suspended solid-floor polypropylene cages furnished with woodflakes. The animals were housed individually during the 24 hour exposure period and in groups of 5, by sex, for the remainder of the study.
- Diet: available ad libitum
- Water: mains drinking water available ad libitum
- Acclimation period: at least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature: 19-25 °C
- Humidity: 30-70%
- Air changes: at least 15 changes per hour
- Photoperiod: 12 hours light (06:00 to 18:00) and 12 hours darkness

Type of coverage:

semiocclusive

Vehicle:

unchanged (no vehicle)

Details on dermal exposure:

TEST SITE
- Area of exposure: On the day before treatment the back and flanks of each animal were clipped free of hair.
- % coverage: approximately 10% of the total body surface area
- Type of wrap if used: A piece of surgical gauze was placed over the treatment area and semi-occluded with a piece of self-adhesive bandage.

REMOVAL OF TEST SUBSTANCE
- Washing (if done): The treated skin and the surrounding hair was wiped with cotton wool moistened with arachis oil BP to remove any residual test item.
- Time after start of exposure: 24 hours

TEST MATERIAL
- Amount applied: 2.26 mL/kg
- The test material was used as supplied.

Duration of exposure:

24 hours

Doses:

2000 mg/kg

No. of animals per sex per dose:

5 animals/sex

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: The animals were observed for deaths or overt signs of toxicity 0.5, 1, 2 and 4 hours after dosing and subsequently once daily for 14 days.
- Necropsy of survivors performed: All animals were subjected to gross necropsy. The appearance of any macroscopic abnormalities were recorded. No tissues were retained.
- Other examinations performed: clinical signs, body weight: Individual bodyweights were recorded prior to application of the test item on Day 0 and on Days 7 and 14.

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

There were no deaths during the study.

Clinical signs:

other: There were no signs of systemic toxicity.

Gross pathology:

No abnormalities were noted at necropsy.

Other findings:

Very slight erythema was noted at the test sites of all males and one female. Small superficial scattered scabs were also noted at the test site of one male. There were no signs of dermal irritation noted in four females.

Individual dermal reactions- male

Dose Level mg/kg	Animal Number and Sex	Observation	Effects Noted After Initiation of Exposure (Days)
			1	2	3	4	5	6	7	8	9	10	11	12	13	14
2000	1-0 Male	Erythema	0	1	1	1	1	0	0	0	0	0	0	0	0	0
		Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
		Other	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	1-1 Male	Erythema	0	0	1	1	1	0	0	0	0	0	0	0	0	0
		Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
		Other	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	1-2 Male	Erythema	0	1	1	1	1	0	0	0	0	0	0	0	0	0
		Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
		Other	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	1-3 Male	Erythema	0	0	1	1	1	1	0	0	0	0	0	0	0	0
		Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
		Other	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	1-4 Male	Erythema	0	0	1	1	1	1	0	0	0	0	0	0	0	0
		Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
		Other	0	0	Ss	Ss	Ss	0	0	0	0	0	0	0	0	0

0= no reactions

Ss= small superficial scattered scabs

Individual dermal reactions- female

Dose Level mg/kg	Animal Number and Sex	Observation	Effects Noted After Initiation of Exposure (Days)
			1	2	3	4	5	6	7	8	9	10	11	12	13	14
2000	2-0 female	Erythema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
		Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
		Other	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	2-1 female	Erythema	0	1	1	1	1	0	0	0	0	0	0	0	0	0
		Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
		Other	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	2-2 female	Erythema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
		Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
		Other	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	2-3 female	Erythema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
		Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
		Other	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	2-4 female	Erythema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
		Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0
		Other	0	0	0	0	0	0	0	0	0	0	0	0	0	0

0= no reactions

 

Interpretation of results:

GHS criteria not met

Remarks:

(EU CLP)

Conclusions:

The acute dermal LD50 of 9-decenoic acid, methyl ester (9DAME) in the Wistar strain rat was found to be >2000 mg/kg bw.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

LD50

Value:

2 000 mg/kg bw

Additional information

Acute oral toxicity

A reliable study was performed in accordance with GLP and OECD Guideline 420 to assess the acute oral toxicity of 9-decenoic acid, methyl ester in the Wistar strain rat (Harlan Laboratories Ltd, 2012). Following a sighting test in two animals at dose levels of 300 mg/kg and 2000 mg/kg, a further group of four fasted animals was given a single oral dose of the test item at a dose level of 2000 mg/kg bw. There were no mortalities or signs of systemic toxicity during the study. All animals showed expected gains in bodyweight and no abnormalities were noted at necropsy. The acute oral LD50 of 9-decenoic acid, methyl ester in the female Wistar strain rat was therefore estimated to be greater than 2000 mg/kg bw.

 

Acute dermal toxicity

A reliable study was performed in accordance with GLP and OECD Guideline 402 to assess the acute dermal toxicity of 9-decenoic acid, methyl ester in the Wistar strain rat (Harlan Laboratories Ltd, 2012). A group of ten animals (five males and five females) was given a single, 24 hour, semi-occluded dermal application of the undiluted test item it intact skin at a dose level of 2000 mg/kg bw. There were no mortalities or signs of systemic toxicity during the study. Very slight erythema was noted at the test sites of all males and one female. Small superficial scattered scabs were also noted at the test site of one male. There were no signs of dermal irritation noted in four females. Animals showed expected gains in bodyweight over the study period except for one female which had a slight bodyweight loss during the first week but expected gain in bodyweight during the second week. No abnormalities were noted at necropsy. The acute dermal LD50 of 9-decenoic acid, methyl ester in the Wistar strain rat was therefore estimated to be greater than 2000 mg/kg bw.

 

Acute inhalation toxicity

9-decenoic acid, methyl ester has been shown by experiment to have a low vapour pressure (13 Pa) and is considered to be of low volatility. In addition, there were no signs of systemic toxicity in both the acute oral and dermal toxicity studies performed with 9-decenoic acid, methyl ester. Further investigations involving vertebrate animals are therefore contraindicated on the grounds of rodent welfare and hence an acute inhalation study is considered scientifically unjustified.

Justification for classification or non-classification

The acute oral and dermal LD50 values for rats were > 2000 mg/kg bw. Inhalation of 9-decenoic acid, methyl ester is not considered to be a likely route of exposure based on its low vapour pressure. Therefore, 9-decenoic acid, methyl ester does not require classification for acute oral, dermal or inhalation toxicity according to the criteria described in Regulation (EC) No 1272/2008.