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Administrative data

Endpoint:
acute toxicity: oral
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2001-04-09 to 2001-04-25
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2001
Report date:
2001

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)
GLP compliance:
yes (incl. QA statement)
Test type:
acute toxic class method
Limit test:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
N,N''-(4-methyl-m-phenylene)bis[N',N'-dimethylurea]
EC Number:
241-523-6
EC Name:
N,N''-(4-methyl-m-phenylene)bis[N',N'-dimethylurea]
Cas Number:
17526-94-2
Molecular formula:
C13H20N4O2
IUPAC Name:
3-[3-(dimethylcarbamoylamino)-4-methylphenyl]-1,1-dimethylurea
Constituent 2
Chemical structure
Reference substance name:
3-[3-(dimethylcarbamoylamino)-2-methylphenyl]-1,1-dimethylurea
Cas Number:
17607-23-7
Molecular formula:
C13H20N4O2
IUPAC Name:
3-[3-(dimethylcarbamoylamino)-2-methylphenyl]-1,1-dimethylurea
impurity 1
Chemical structure
Reference substance name:
Water
EC Number:
231-791-2
EC Name:
Water
Cas Number:
7732-18-5
Molecular formula:
H2O
IUPAC Name:
Water
impurity 2
Reference substance name:
unknown
IUPAC Name:
unknown
Test material form:
solid

Test animals

Species:
rat
Strain:
Wistar
Sex:
male/female
Details on test animals or test system and environmental conditions:
TEST ANIMALS
- Source: Harlan Winkelmann GmbH, D-33178 Borchen
- Age at study initiation: no data
- Weight at study initiation: Body weight at the commencement of the study: male 150- 168 g and female 142- 160 g. 3 male and 3 female animals were used.
- Fasting period before study: Prior to administration of the test item animals were fasted by withholding food overnight. Following the period of fasting the animals were weighed and the test item was administered. Then the food was withheld for a further 3-4hours.
- Housing: The animals were barrier maintained (semi-barrier) in air conditioned rooms
- Diet (e.g. ad libitum): ad libitum
- Water (e.g. ad libitum): ad libitum
- Acclimation period: adequate

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22+/-3°C
- Humidity (%): 55+/-10%
- Air changes (per hr): 10x per hour
- Photoperiod (hrs dark / hrs light): 12/12

Administration / exposure

Route of administration:
oral: gavage
Vehicle:
CMC (carboxymethyl cellulose)
Remarks:
1%
Details on oral exposure:
VEHICLE
- Concentration in vehicle: 2000 mg TDI-Urone in 1 % Carboxymethylcellulose (CMC, Sigma, Lot-No. 36H0738) ad 10 ml
- Amount of vehicle (if gavage): 10 ml/kg body weight
- Justification for choice of vehicle:The vehicle was chosen due to its non-toxic characteristics.
- Lot/batch no. (if required): 36H0738
- Purity: no data
Doses:
2000 mg/kg bw
No. of animals per sex per dose:
3 males and 3 females
Control animals:
no
Details on study design:
- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: Animals were observed for 14 days after dosing. The animals were weighed prior to first application and once a week thereafter. A careful clinical examination was made twice a day on the day of dosing and once a day thereafter.
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight
Statistics:
none

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:
As none of the animals died the LD0 is >2000 mg/kg body weight.
Clinical signs:
No clinical signs of toxicity were observed throughout the observation period.
Body weight:
Throughout the 14-days observation period no weight loss was recorded (table 1). The weight gain was within the expected range.
Gross pathology:
Necropsy revealed an acute injection of blood vessels in all animals in fue abdominal region. This finding is due to euthanasia with an overdose of pentobarbital injected intraperitoneally.
Other findings:
no other findings

Any other information on results incl. tables

Table1: Bodyweight gain

Animal No.

Day 0

Day 7

Day 14

male

1

150

188

229

2

168

215

256

3

160

210

240

female

1

142

158

170

2

146

159

180

3

160

169

184

Applicant's summary and conclusion

Interpretation of results:
GHS criteria not met
Conclusions:
The LD50 of TDI-Urone was established to be > 2000 mg/kg body weight. As none of the animals died the corresponding LD0 is > 2000 mg/kg bw. Thus, TDI-Urone is practically nontoxic.
Executive summary:

In an acute oral toxicity study according to OECD 423, groups of 3 male and 3 female rats (Wistar) were given a single oral dose of 2000 mg/kg body weight TDI-Urone in 1% Carboxymethylcellulose and were observed for 14 days.

Considering the reported data of this toxicity test it can be stated that the test item TDI-Urone has no acute toxic characteristics.

According to the results obtained the LD50 was determined to be > 2000 mg/kg bw.