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Description of key information

An acute oral and an acute inhalation study with Acetoguanamine are available.
The LD50 value (oral) for the test substance was calculated to be 2.74 g/kg body weight.
Furthermore the LC50 value (inhalation) was calculated to be greater than 2.031 mg/L, which was considered to be the maximum practical with the atmosphere generation system used.

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:
July - October 1972
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: No guideline for the testing methode is mentioned in the report. Nevertheless the test result seems to be reliable as the observation period is also stated to be 14 days and the testing procedure as well as the choice of doses seems to be reasonable.
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 401 (Acute Oral Toxicity)
GLP compliance:
not specified
Test type:
standard acute method
Limit test:
no
Species:
rat
Strain:
other: Wistar derived
Sex:
male/female
Details on test animals or test system and environmental conditions:
TEST ANIMALS
- Source: colony of TNO institute
- Weight at study initiation: 150 to 260 g (males) and 108 to 208 g (females)
- Fasting period before study: 16 hours
- Stock diet and tap water: ad libitum
Route of administration:
oral: gavage
Vehicle:
CMC (carboxymethyl cellulose)
Details on oral exposure:
VEHICLE
- Concentration in vehicle: a 20 % (w/v) suspension of Acetoguanamine in a 5 % aqueous solution of carboxy methyl cellulose

MAXIMUM DOSE VOLUME APPLIED:
15 ml of the 20 % suspension of Acetoguanamine in a 5 % aqueous solution of carboxy methyl cellulose for each kg of body weight.
Doses:
10, 11, 12, 13, 14 and 15 ml of the 20 % suspension of Acetoguanamine in a 5 % aqueous solution of carboxy methyl cellulose for each kg of body weight.
No. of animals per sex per dose:
five
Control animals:
no
Details on study design:
- Duration of observation period following administration: 14 days
- Necropsy of survivors performed: yes
Statistics:
no statistics reported
Sex:
not specified
Dose descriptor:
LD50
Effect level:
2.74 other: g/kg
95% CL:
2.57 - 2.92
Mortality:
Some of the animals died within three hours after the treatment with Acetoguanamine.
Deaths occurred up to two days after dosing.
Clinical signs:
other: One hour after the treatment all animals became sluggish and showed severe diarrhoea. But the survivors recovered rapidly and looked quite healthy again at the end of the first week.
Gross pathology:
No abnormalities were seen in these animals at autopsy.
Other findings:
no data

TABEL 1: The mortality in the test animals of the various dose groups after the treatment with Acetoguanamine.

dose

mortality

ml 20 % solution/kg

g test substance/kg

number

%

males

females

10

2.0

0/5

0/5

0

11

2.2

0/5

2/5

20

12

2.4

1/5

0/5

10

13

2.6

0/5

2/5

20

14

2.8

2/5

4/5

60

15

3.0

3/5

5/5

80
Interpretation of results:
not classified
Remarks:
Migrated information Criteria used for interpretation of results: EU
Conclusions:
The LD50 value of Acetoguanamine was calculated to be 2.74 g/kg body weight with 2.92 and 2.57 as 95 % confidence limits. Because of this reason Acetoguanamine is not classified as acute oral toxic.
Executive summary:

An acute oral toxicity test with Acetoguanamine was performed. No guideline for the testing methode is mentioned in the report. Nevertheless the test result seems to be reliable as the observation period is also stated to be 14 days and the testing procedure as well as the choice of doses seems to be reasonable.

On the basis of some preliminary observations the following doses were given as as one single dose to groups of five male and five female rats: 2.0, 2.2, 2.4, 2.6, 2.8, 3.0 g test substance / kg bw.

The animals were observed for a 14 -day period. Then the survivors were killed and examined grossly. With the obtained study results the LD50 of Acetoguanamine was calculated to be 2.74 g/kg body weight. Because of this reason Acetoguanamine is not classified as acute oral toxic.

Endpoint conclusion
Endpoint conclusion:
no adverse effect observed
Dose descriptor:
LD50
Value:
2 740 mg/kg bw

Acute toxicity: via inhalation route

Link to relevant study records
Reference
Endpoint:
acute toxicity: inhalation
Type of information:
experimental study
Adequacy of study:
key study
Study period:
February - April 1990
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Reliable without restrictions; Guideline study (OECD 403; Acute Inhalation Toxicity) according to GLP
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 403 (Acute Inhalation Toxicity)
GLP compliance:
yes
Test type:
standard acute method
Limit test:
yes
Species:
rat
Strain:
other: Spargue Dawley-derived rats of the strain Crl:CD(SD)BR
Sex:
male/female
Details on test animals or test system and environmental conditions:
TEST ANIMALS
- Source: Charles River (UK) Ltd., Margate
- Age at study initiation: about six to eight weeks old
- Weight at study initiation: 180 to 200 g
- Fasting period before study: no data
- Housing: in a single room, in groups of five by sex, in grid-floor cages.
- Diet and drinking water: expect during the exposure period, the animals were allowed free access to mains water and food (SQC Rat and Mouse Maintenance Diet No. 1 Expanded, Special Diets Services Ltd., Witham); food and water were analysed by the supplier and the water authority respectively and the analytical data are on file at HUK.
- Acclimation period: for at least five days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 19 to 25 °C
- Humidity (%): 40 to 70 % relative humidity
- Air changes (per hr):ventilation system maintained a minimum of 15 air changes per hour.
- Photoperiod (hrs dark / hrs light): fluorescent lighting, automatically controlled to give a cycle of 12 hours light and 12 hours darkness
Route of administration:
inhalation: aerosol
Type of inhalation exposure:
head only
Vehicle:
clean air
Details on inhalation exposure:
GENERATION OF TEST ATMOSPHERE / CHAMBER DESCRIPTION
- Exposure apparatus: two "Wright" dust feed generators located immediately above the chamber and supplied with compressed air
- Exposure chamber volume: 40 litre internal volume
- Method of holding animals in test chamber: animals were housed in a single room, in groups of five by sex, in grid-floor cages
- Source and rate of air: filtered air; flowrate: 25 and 30 L/min for the control and treated groups respectively.
- Oxygen concetration: in the range 20.6-21 %.
- System of generating particulates/aerosols: the powder was continously dispersed in air by means of a "Wright" dust feed generator
- Method of particle size determination: particle size was determined using a Marple Sierra Series 298 Cascade Impactor, with 6 separation stages corresponding to maximum mass median aerodynamic diameters of 0.52, 0.93, 1.55, 3.5, 6.0, 9.8 µm.
- Temperature, humidity, pressure in air chamber: 19-21 °C, 24-66%

TEST ATMOSPHERE
- Brief description of analytical method used: The concentration of the test article was determined gravimetrically. The sample was obtained hourly, over periods of up to three minutes during the exposure period (i. e. during hours 1, 2, 3 and 4).
- Samples taken from breathing zone: yes

VEHICLE
- Concentration of test material in vehicle (if applicable): mean concentartion of the atmosphere: 2.031 mg Acetoguanamine /L. nominal concentartion: 7.270 mg Acetoguanamine / L.

TEST ATMOSPHERE (if not tabulated)
- MMAD (Mass median aerodynamic diameter) / GSD (Geometric st. dev.): the mean mass median aerodynamic diameter of the particles in the atmosphere for the treated group was 4.00 µm. This value indicates that the mean diameter of the aerosol droplets was within the respirable range of the rat (up to 5 µm).
Analytical verification of test atmosphere concentrations:
yes
Duration of exposure:
4 h
Concentrations:
The mean measured concentration of Acetoguanamine in the atmosphere was 2.031 mg/L.
The nominal concentration of Acetoguanamine was 7.270 mg/L.
No. of animals per sex per dose:
five
Control animals:
yes
Details on study design:
- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: all animals examined twice daily to detect any which were dead or moribund; individual body weights were recorded immediately before and after exposure and on days 8 and 15 of the study and at necropsy.
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight,organ weights
Statistics:
Data were processed, where appropriate, to give group mean values and standard deviations.
No further statistical analyses were performed.
Sex:
male/female
Dose descriptor:
LC50
Effect level:
> 2.031 mg/L air
Based on:
test mat.
Exp. duration:
4 h
Mortality:
Mortality did not occur either during exposure or during the subsequent 14-day observation period with the test substance Acetoguanamine.
Clinical signs:
other: The clinical signs observed were considerd not to be attributable to exposure to Acetoguanamine. Nasal secretion and chromodacryorrhoea seen in both control and treated groups, and staining to the head, seen in the control group, were considered to result
Body weight:
Transcient body weight losses occurred as a result of the restraint procedures in both the control and treated group animals.
The body weights of the treated males at days 8 and 15 showed no adversed effect. The treated female group animals showed a small body weight loss during the first week of observation, but body weight gain was normal thereafter.
Gross pathology:
Lung weights and lung/body weight ratios:
were comparable for both control and treated animals, and there was no evidence of a treatment-related effect with Acetoguanamine.

Macroscopic pathology:
There were no macroscopic abnormalities after the treatment with Acetoguanamine.
Other findings:
no data
Interpretation of results:
practically nontoxic
Remarks:
Migrated information Criteria used for interpretation of results: expert judgment
Conclusions:
Exposure of Acetoguanamine at a single chamber concentration of 2.031 mg/L did not cause mortality. Minor signs of toxiocity such as changes in clinical cindition and small body weight loss in treated females were considered not to be significant signs of toxicity.
Using standard toxicity assessment criteria (K. Schsse et al. Exp. Med. Int. Congr. Ser. (1974), 311, 239.) the test article can be classified as non-toxic or slightly toxic. As the maximum practical concentration used produced only slight signs of toxictiy Acetoguanamine should probably be classified as non-toxic.
Executive summary:

The aim of this study was to determine the 4 -hour LC50 value of Acetoguanamine. Each five male and female rats were exposed to the test atmosphere generated by dispersing the powder continously in air by means of a "Wright" dust feed mechanism with a mean measured concentration in the atmosphere of 2.031 mg/L for four hours (head-only exposure).

The animals were observed for motality and signs of intoxication during exposure and daily thereafter for 14 days. The particle size was determined with 6 separation stages corresponding to maximum mass median aerodynamic diameters of 0.52, 0.93, 1.55, 3.5, 6.0 and 9.8 µm.

Exposure of Acetoguanamine at a single chamber concentration of 2.031 mg/L did not cause mortality. Minor signs of toxicity such as changes in clinical conditions and small body weight loss in treated females were considered not to be significant signs of toxicity.

Using standard assessment crtiteria Acetoguanamine can be classified as non-toxic or slightly toxic. As the maximum practical concetration used produced only slight signs of toxicity Acetoguanamine should probably be classified as non-toxic.

Endpoint conclusion
Endpoint conclusion:
no adverse effect observed
Dose descriptor:
LC50
Value:
2 031 mg/m³ air

Acute toxicity: via dermal route

Endpoint conclusion
Endpoint conclusion:
no study available

Additional information

An acute oral and an acute inhalation study with Acetoguanamine are available.

The LD50 value (oral) for the test substance was calculated to be 2.74 g/kg body weight.

Furthermore the LC50 value (inhalation) was calculated to be greater than 2.031 mg/L, which was considered to be the maximum practical with the atmosphere generation system used. Also with this limit concentration no deaths occurred.

Justification for classification or non-classification

According to Regulation (EC) No. 1272/2008 a LD50 oral value of more than 2000 mg/kg body weight is not considered to indicate oral acute toxicity. Furthermore the LC50 value (inhalation) was calculated to be greater than 2.031 mg/L, which was considered to be the maximum practical with the atmosphere generation system used. Also with this limit concentration no deaths occurred.Therefore Acetoguanamine is also not considered to indicate acute inhalation toxicity.