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Administrative data

Endpoint:
acute toxicity: oral
Type of information:
experimental study
Adequacy of study:
key study
Study period:
Betwen 26 May 2016 and 15 June 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Study conducted in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of the relevant results.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2016
Report date:
2016

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
GLP compliance:
yes (incl. QA statement)
Test type:
acute toxic class method
Limit test:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
Tetrasodium [μ-[3-[[2-amino-5-hydroxy-6-[(2-hydroxy-5-nitro-3-sulphophenyl)azo]-7-sulpho-1-naphthyl]azo]-2-hydroxy-5-sulphobenzoato(8-)]]dichromate(4-)
EC Number:
276-538-7
EC Name:
Tetrasodium [μ-[3-[[2-amino-5-hydroxy-6-[(2-hydroxy-5-nitro-3-sulphophenyl)azo]-7-sulpho-1-naphthyl]azo]-2-hydroxy-5-sulphobenzoato(8-)]]dichromate(4-)
Cas Number:
72252-58-5
Molecular formula:
C23H8Cr2N6O16S3.4Na
IUPAC Name:
tetrasodium [μ-[3-[[2-amino-5-hydroxy-6-[(2-hydroxy-5-nitro-3-sulphophenyl)azo]-7-sulpho-1-naphthyl]azo]-2-hydroxy-5-sulphobenzoato(8-)]]dichromate(4-)

Test animals

Species:
rat
Strain:
Wistar
Sex:
female
Details on test animals or test system and environmental conditions:
Female Wistar (RccHan™:WIST) strain rats were supplied by Envigo RMS (UK) Limited, Oxon, UK. On receipt the animals were randomly allocated to cages. The females were nulliparous and non pregnant. After an acclimatization period of at least 5 days the 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. At the start of the study the animals were 8 to 12 weeks of age. The body weight variation did not exceed ±20% of the mean body weight of any previously dosed animals.
Animal Care and Husbandry
The animals were housed in groups three in suspended solid floor polypropylene cages furnished with woodflakes. With the exception of an overnight fast immediately before dosing and for approximately 3 to 4 hours after dosing, free access to mains drinking water and food (2014C Teklad Global Rodent diet supplied by Envigo RMS (UK) Limited, Oxon, UK) was allowed throughout the study. The diet, drinking water and bedding were routinely analyzed and were considered not to contain any contaminants that would reasonably be expected to affect the purpose or integrity of the study.
The temperature and relative humidity were set to achieve limits of 19 to 25 °C and 30 to 70% respectively. The rate of air exchange was at least fifteen changes per hour and the lighting was controlled by a time switch to give 12 hours continuous light and 12 hours darkness.
The animals were provided with environmental enrichment items which were considered not to contain any contaminant of a level that might have affected the purpose or integrity of the study.

Administration / exposure

Route of administration:
oral: gavage
Vehicle:
arachis oil
Details on oral exposure:
All animals were dosed once only by gavage
Doses:
Using available information on the toxicity of the test item, 2000 mg/kg was chosen as the starting dose.
Groups of fasted animals were treated as follows:
Dose Level(mg/kg) Concentration(mg/mL) Dose Volume(mL/kg) Number of Rats(Female)
2000 200 10 3
2000 200 10 3
No. of animals per sex per dose:
3 animals per dose, 2 dose groups.
Control animals:
no
Details on study design:
Using available information on the toxicity of the test item, 2000 mg/kg was chosen as the starting dose.
Groups of fasted animals were treated as follows:
Dose Level(mg/kg) Concentration(mg/mL) Dose Volume(mL/kg) Number of Rats(Female)
2000 200 10 3
2000 200 10 3
All animals were dosed once only by gavage, using a metal cannula attached to a graduated syringe. The volume administered to each animal was calculated according to the fasted body weight at the time of dosing. Treatment of animals was sequential. Sufficient time was allowed between each group to confirm the survival of the previously dosed animals.
The animals were observed for deaths or overt signs of toxicity 30 minutes, 1, 2 and 4 hours after dosing and subsequently once daily for 14 days.
Individual body weights were recorded prior to dosing and 7 and 14 days after treatment.
At the end of the observation period the animals were killed by cervical dislocation. All animals were subjected to gross pathological examination. This consisted of an external examination and opening of the abdominal and thoracic cavities for examination of major organs. The appearance of any macroscopic abnormalities was recorded. No tissues were retained.
Statistics:
None recorded

Results and discussion

Preliminary study:
Not applicable.
Effect levels
Key result
Sex:
female
Dose descriptor:
LD50
Effect level:
> 2 000 mg/kg bw
Based on:
test mat.
Remarks on result:
other: 95% CL not reported
Mortality:
Individual mortality data are given in Table 1
There were no deaths
Clinical signs:
Individual clinical observations are given in Appendix 1.
Noisy respiration and/or hunched posture were noted in the first group of three treated animals. These animals appeared normal 4 hours or 2 days after dosing.
No signs of systemic toxicity were noted in the second group of three treated animals during the observation period.
Black staining of the feces and urine was noted in the cages of all animals.
Body weight:
Individual body weights and body weight change are given in Table2.
All animals showed expected gains in body weight over the observation period.
Gross pathology:
Individual necropsy findings are given in Table 3.
Black stained kidneys and stomach were noted at necropsy of the first group of three treated animals. No abnormalities were noted at necropsy of the second group of three treated animals.
Other findings:
None

Any other information on results incl. tables

Table1     Individual Clinical Observations and Mortality Data

Dose Level mg/kg

Animal Number and Sex

Effects Noted After Dosing
(Hours)

Effects Noted During Period After Dosing
(Days)

½

1

2

4

1UF

2U*F

3U*F

4U*F

5F·

6

7

8

9

10

11

12

13

14

2000

1-0

Female

H

H

H

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

1-1

Female

HRn

HRn

HRn

Rn

Rn

0

0

0

0

0

0

0

0

0

0

0

0

0

1-2

Female

HRn

HRn

HRn

Rn

Rn

0

0

0

0

0

0

0

0

0

0

0

0

0

2-0

Female

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

2-1

Female

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

2-2

Female

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0


0=   No signs of systemic toxicity

H =  Hunched posture

Rn =Noisy respiration

F =  Black colored staining of the feces

F·= Black colored staining of the feces of animal numbers 1-0, 1-1 and 1-2

U =  Black staining of the urine

U* =Black staining of the urine in the cages of animal numbers 2-0, 2-1 and 2-2

Table 2     Individual Body Weights and Body Weight Changes

Dose Level
mg/kg

Animal Number
and Sex

Body Weight (g) at Day

Body Weight Gain (g) During Week

0

7

14

1

2

2000

1-0 Female

176

186

199

10

13

1-1 Female

173

184

192

11

8

1-2 Female

188

213

220

25

7

2-0 Female

184

194

217

10

23

2-1 Female

202

207

220

5

13

2-2 Female

198

205

221

7

16

Table 3     Individual Necropsy Findings

Dose Level
mg/kg

Animal Number
and Sex

Time of Death

Macroscopic Observations

2000

1-0 Female

Killed Day 14

Kidneys: stained black

Stomach: stained black

1-1 Female

Killed Day 14

Kidneys: stained black

Stomach: stained black

1-2 Female

Killed Day 14

Kidneys: stained black

Stomach: stained black

2-0 Female

Killed Day 14

No abnormalities detected

2-1 Female

Killed Day 14

No abnormalities detected

2-2 Female

Killed Day 14

No abnormalities detected

Applicant's summary and conclusion

Interpretation of results:
GHS criteria not met
Conclusions:
The acute oral median lethal dose (LD50) of the test item in the female Wistar strain rat was estimated to be greater than 2500 mg/kg body weight (Globally Harmonized Classification System - Unclassified).
Executive summary:

Introduction

The study was performed to assess the acute oral toxicity of the test item in the Wistar strain rat.

Methods

A group of three fasted females was treated with the test item at a dose level of 2000 mg/kg body weight. This was followed by a further group of three fasted females at the same dose level. Dosing was performed sequentially.

The test item was administered orally as a suspension in arachis oil BP. During the observation period of 14 days clinical signs and body weight development were monitored. Thereafter all animals were subjected to gross necropsy.

Results

Mortality. There were no deaths.

Clinical Observations. Noisy respiration and/or hunched posture were noted in the first group of three treated animals. There were no signs of systemic toxicity noted in the second group of three treated animals. Black staining of the feces and urine was noted in the cages of all animals.

Body Weight. All animals showed expected gains in body weight.

Necropsy. Black stained kidneys and stomach were noted at necropsy of the first group of three treated animals. No abnormalities were noted at necropsy of thesecond group of three treated animals.

Conclusion

The acute oral median lethal dose (LD50) of the test item in the female Wistar strain rat was estimated to be greater than 2500 mg/kg body weight (Globally Harmonized Classification System - Unclassified).

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