2-(ethylnitroamino)ethyl nitrate

Acute Toxicity: dermal

Administrative data

Endpoint:

acute toxicity: dermal

Type of information:

experimental study

Adequacy of study:

key study

Study period:

15 November 1991 - 29 November 1991

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

comparable to guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1992

Report date:

1992

Materials and methods

Test guideline

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 402 (Acute Dermal Toxicity)

Deviations:

yes

Remarks:

Species tested was different from the preferred one and the number of animals used was higher than that specified in the Guideline.

GLP compliance:

yes (incl. QA statement)

Test type:

fixed dose procedure

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

2-(ethylnitroamino)ethyl nitrate

EC Number:

285-332-6

EC Name:

2-(ethylnitroamino)ethyl nitrate

Cas Number:

85068-73-1

Molecular formula:

C4H9N3O5

IUPAC Name:

ethyl(nitro)[2-(nitrooxy)ethyl]amine

Test material form:

liquid

Test animals

Species:

rabbit

Strain:

New Zealand White

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: CAMM Research Lab Animals, Wayne, NJ; Hazleton Research Products, Denver, PA; Buckshire Corporation, Perkasie, PA.
- Females nulliparous and non-pregnant: Not specified.
- Age at study initiation: 8 - 12 weeks
- Weight at study initiation: Male: 2051.6 g (SD = 221.97 g); Female: 2135.0 g (SD = 266.17 g)
- Fasting period before study: not specified.
- Housing: Rabbits were housed individually in cages sized in accordance with the "Guide for the Care and Use of Laboratory Animals" of the Institute of Laboratory Animal Resources, National Research Council. Waste material was removed twice weekly. Cages and feeders were sanitized every two weeks.
- Diet (e.g. ad libitum): Ad libitum. Purina Lab Rabbit Chow H.FR. Food was checked daily and added or replaced as needed. Feeders are designed to reduce soiling, bridging and scattering.
- Water (e.g. ad libitum): Ad libitum. Drinking water (Fresh tap-water). Water was monitored for contaminants at periodic intervals according to Standard Operating Procedure PH-018.
- Acclimation period: the animals were acclimatized for at least 5 days before treatment.

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 20ºC (±3ºC)
- Humidity (%): 30 to 70%
- Air changes (per hr): Not specified
- Photoperiod (hrs dark / hrs light): 12 hours light and 12 hours dark cycle.

Administration / exposure

Type of coverage:

semiocclusive

Vehicle:

unchanged (no vehicle)

Details on dermal exposure:

TEST SITE
- Area of exposure: dorsal area of the trunk
- % coverage: Not specified.
- Type of wrap if used: A square gauze patch was placed on the animals to cover the dosed area. The animals were wrapped with rubber dam and an elastic bandage to retard evaporation.

REMOVAL OF TEST SUBSTANCE
- Washing (if done): the skin sites were wiped with water and gauze.
- Time after start of exposure: 24h

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 2000 mg/kg body weight
- Concentration (if solution): N/A
- Constant volume or concentration used: yes
- For solids, paste formed: N/A

Duration of exposure:

24 h

Doses:

2000 mg/kg body weight

No. of animals per sex per dose:

5

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: Observations were recorded daily through Day 14. Body weights were recorded at initiation and on Days 7 and 14.
- Necropsy of survivors performed: yes. At termination, gross pathological findings were recorded and reported.

Results and discussion

Effect levels

Key result

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

No mortality ocurred during the study.

Clinical signs:

other: No clinical signs were observed in any animal receiving the test chemical.

Gross pathology:

No visible lesions were observed in any animal at terminal necropsy.

Any other information on results incl. tables

Table 1. Summary of Clinical Observations. N-Ethyl-2 Nitratoethyl Nitramine

Clinical signs	Sex	Hours	Days
		24	2	3	4	5	6	7	8	9	10	11	12	13	14
No signs	M	5	5	5	5	5	5	5	5	5	5	5	5	5	5
	F	5	5	5	5	5	5	5	5	5	5	5	5	5	5

Table 2. Summary of mortality. N-Ethyl-2 Nitratoethyl Nitramine

Dose (mg/kg)	Sex	Nº of rabbits	Days													Total mortality
			2	3	4	5	6	7	8	9	10	11	12	13	14
2000	M	5	0	0	0	0	0	0	0	0	0	0	0	0	0	0/5
2000	F	5	0	0	0	0	0	0	0	0	0	0	0	0	0	0/5

Table 3. Summary of Body Weights (g). N-Ethyl-2 Nitratoethyl Nitramine

Animal Number	Sex	Initial	Day 7	Final
5271	M	2034	2186	2327
5272	M	2138	2192	2309
5273	M	2361	2521	2681
5274	M	1911	2137	2278
5275	M	1814	1934	2095
x		2051.6	2194.0	2338.0
S.D.		211.97	210.86	212.87
N		5	5	5
5276	F	2340	2503	2613
5277	F	1866	1990	2084
5278	F	2444	2636	2755
5279	F	1865	1984	2115
5280	F	2160	2284	2396
x		2135.0	2279.4	2392.6
S.D.		266.17	295.04	296.74
N		5	5	5

Table 4. Necropsy Observations (Incidence Values). N-Ethyl-2 Nitratoethyl Nitramine

Observation	Interim Death Incidence		Terminal Necropsy Incidence
No visible lesions	M	F	M	F
	-	-	5	5

Applicant's summary and conclusion

Interpretation of results:

other: No category (CLP Regulation EC no. 1272/2008)

Conclusions:

The LD50 of the test item is higher than 2000 mg/kg body weight by dermal route in rabbits.

Executive summary:

In a dermal limit test (GLP study), one group of 10 New Zealand White rabbits (five males and five females) was exposed to the test substance at 2000 mg/kg for an exposure period of 24 h. Animals were observed for clinical signs and mortality once daily for fourteen days. No mortality and no clinical signs were observed in any animal receiving the test chemical. There were no apparent effects on mean body weight throughout the study. No visible lesions were observed in any animal at terminal necropsy. Based upon these observations, the estimated acute dermal LD50 (combined sexes) was determined to be greater than 2000 mg/kg.