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Acute Toxicity: oral

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Administrative data

Endpoint:
acute toxicity: oral
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From 06 MAR 2012 to 27 MAR 2012
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Guideline study (OECD 423) and according to GLP.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2012
Report date:
2012

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method B.1 tris (Acute Oral Toxicity - Acute Toxic Class Method)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 870.1100 (Acute Oral Toxicity)
Deviations:
no
GLP compliance:
yes
Test type:
acute toxic class method
Limit test:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
4-[(2,5-dichlorophenyl)azo]-N-(2,3-dihydro-2-oxo-1H-benzimidazol-5-yl)-3-hydroxynaphthalene-2-carboxamide
EC Number:
230-258-1
EC Name:
4-[(2,5-dichlorophenyl)azo]-N-(2,3-dihydro-2-oxo-1H-benzimidazol-5-yl)-3-hydroxynaphthalene-2-carboxamide
Cas Number:
6992-11-6
Molecular formula:
C24H15Cl2N5O3
IUPAC Name:
4-[(2,5-dichlorophenyl)diazenyl]-3-hydroxy-N-(2-oxo-2,3-dihydro-1H-benzimidazol-5-yl)-2-naphthamide
Test material form:
solid: nanoform, no surface treatment

Test animals

Species:
rat
Strain:
Wistar
Sex:
female
Details on test animals or test system and environmental conditions:
TEST ANIMALS
- Source: Charles River, 97633 Sulzfeld, Germany
- Age at study initiation: 9-11 weeks
- Weight at study initiation: 150-174 g
- Fasting period before study: 16-19 h
- Housing: in groups in IVC cages, type III H, polysulphone cages on Altromin saw fibre bedding (lot no. 110811)
- Diet: Altromin 1324 maintenance diet for rats and mice (lot no. 0815), ad libitum
- Water: tap water, sulphur acidified to a pH value of approximately 2.8 (drinking water, municipal residue control, microbiological controls at regular intervals), ad libitum
- Acclimation period: at least 5 days

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

Administration / exposure

Route of administration:
oral: gavage
Vehicle:
cotton seed oil
Details on oral exposure:
VEHICLE
- Amount of vehicle (if gavage): 10 mL / kg bw
- Justification for choice of vehicle: The vehivle was chosen due to its non-toxic characteristics
- Lot/batch no. (if required): MKBG0088V

MAXIMUM DOSE VOLUME APPLIED: 10 mL / kg bw

CLASS METHOD (if applicable)
- Rationale for the selection of the starting dose: highest required dose tested.
Doses:
The starting dose was selected to be 2000 mg/kg bw. No compound-related mortality was recorded for any animal of step 1 or 2. Based on these results and according to the acute toxic class method regime no further testing was required.
No. of animals per sex per dose:
3 females per step / 2 steps performed
Control animals:
no
Details on study design:
- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: The animals were weighed on day 1 (prior to administratin) and on days 8 and 15.
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight
Statistics:
no

Results and discussion

Effect levels
Key result
Sex:
female
Dose descriptor:
LD50
Effect level:
> 2 000 mg/kg bw
Based on:
test mat.
Remarks on result:
other: no animal died during the 14-day observation period
Mortality:
All animals survived until the end of the study.
Clinical signs:
other: None of the animals showed any sign of toxicity.
Gross pathology:
With the exception of acute injection of blood vessels in the abdominal region, which is due to the euthanasia injection, no specific gross pathological changes were recorded for any animal.

Any other information on results incl. tables

Table: Body Weight Development - Absolute Body Weights in g and Body Weight Gain in %

Animal No. /
Sex

g
Day 1

g
Day 8

g
Day 15

%
Day 1-15

Step 1 (2000 mg/kg Body Weight)

1 / female

166

192

193

16

2 / female

174

189

203

17

3 / female

150

167

170

13

Step 2 (2000 mg/kg Body Weight)

4 / female

156

179

184

18

5 / female

170

194

200

18

6 / female

166

183

194

17

Table: LD50 Cut-Off

Dose
(unit)

Number of
Animals
Investigated

Number of Intercurrent Deaths

LD50 Cut-Off

2000 mg/kg bw

6

0

unclassified

Applicant's summary and conclusion

Interpretation of results:
GHS criteria not met
Conclusions:
Under the conditions of the present study, a single oral application of the test item to female rats at a dose of 2000 mg/kg body weight was associated with no sign of toxicity or mortality. The LD50 for female rats is > 2000 mg/kg body weight
Executive summary:

Two groups, each of three female WISTAR Crl: WI(Han) rats, were treated with the test item by oral gavage administration at a dosage of 2000 mg/kg body weight. The test item was suspended in cotton seed oil at a concentration of 0.2 g/mL and administered at a dose volume of 10 mL/kg.

All animals used in the study were allowed to acclimatise to the laboratory conditions for at least 5 days. The animals were observed on delivery, on inclusion in the study and before administration for mortality/morbidity and other clinical signs. All animals were examined for clinical signs several times on the day of dosing and once daily until the end of the observation period. Their body weights were recorded on day 1 (prior to the administration) and on days 8 and 15. All animals were necropsied and examined macroscopically.

Table1:  Results per Step

Step

Sex/No.

Dose (mg/kg)

Number of Animals

Number of Intercurrent Deaths

1

female/1-3

2000

3

0

2

female/4-6

2000

3

0

All animals survived until the end of the study without showing any signs of toxicity.

Throughout the 14-day observation period, the body weight gain of the test animals was within the normal range of variation for this strain.

At necropsy, no macroscopic findings were observed in any animal of any step. The LD50 for rats is > 2000 mg/kg body weight