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Administrative data

Endpoint:
acute toxicity: oral
Type of information:
experimental study
Adequacy of study:
key study
Study period:
07 July 2016 to 26 July 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

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 420 (Acute Oral Toxicity - Fixed Dose Method)
Version / remarks:
2001
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method B.1 bis (Acute Oral Toxicity - Fixed Dose Procedure)
Version / remarks:
EC 440/2008
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Test type:
fixed dose procedure
Limit test:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
1,2-dihydro-6-hydroxy-1,4-dimethyl-2-oxo-5-[[3-[(phenylsulphonyl)oxy]phenyl]azo]nicotinonitrile
EC Number:
261-693-5
EC Name:
1,2-dihydro-6-hydroxy-1,4-dimethyl-2-oxo-5-[[3-[(phenylsulphonyl)oxy]phenyl]azo]nicotinonitrile
Cas Number:
59312-61-7
Molecular formula:
C20H16N4O5S
IUPAC Name:
3-[(5-cyano-2-hydroxy-1,4-dimethyl-6-oxo-1,6-dihydropyridin-3-yl)diazenyl]phenyl benzenesulfonate
Test material form:
solid: particulate/powder
Remarks:
migrated information: powder
Specific details on test material used for the study:
Identification: FAT 93460/D TE
Batch: 20140721 (China)
Physical state/Appearance: yellow powder
Purity: 94.6%
Expiry Date: 14 October 2019
Storage Conditions: approximately 4 °C in the dark

Test animals

Species:
rat
Strain:
Wistar
Remarks:
RccHan™:WIST
Sex:
female
Details on test animals or test system and environmental conditions:
TEST ANIMALS
- Source: Envigo RMS (UK) Limited, Oxon, UK
- Females (if applicable) nulliparous and non-pregnant: yes
- Age at study initiation: 8-12 weeks
- Weight at study initiation: 159 - 173 g
- Fasting period before study: overnight fast immediately before dosing and for approximately 3 to 4 hours after dosing
- Housing: in groups of up to four in suspended solid floor polypropylene cages furnished with woodflakes
- Diet (e.g. ad libitum): ad libitum
- Water (e.g. ad libitum): ad libitum
- Acclimation period: 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 19-25
- Humidity (%): 30-70
- Air changes (per hr): >15
- Photoperiod (hrs dark / hrs light): 12/12

IN-LIFE DATES: From: 07 July 2016 To: 26 July 2016

Administration / exposure

Route of administration:
oral: gavage
Vehicle:
arachis oil
Details on oral exposure:
VEHICLE
- Concentration in vehicle: 200 mg/mL
- Amount of vehicle (if gavage): 10 mL
- Justification for choice of vehicle: Arachis oil BP was used because the test item did not dissolve/suspend in distilled water.
Doses:
2000 mg/kg bw
No. of animals per sex per dose:
5
Control animals:
no
Details on study design:
Clinical observations were made 30 minutes, 1, 2, and 4 hours after dosing and then daily for 14 days. Morbidity and mortality checks were made twice daily.
Individual body weights were recorded on Day 0 (the day of dosing) and on Days 7 and 14.
At the end of the observation period the animals were killed by cervical dislocation. All animals were subjected to gross necropsy. This consisted of an external examination and opening of the abdominal and thoracic cavities. The appearance of any macroscopic abnormalities was recorded. No tissues were retained.

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:
not determinable due to absence of adverse toxic effects
Mortality:
There were no deaths.
Clinical signs:
other: No signs of systemic toxicity were noted during the observation period.
Gross pathology:
No abnormalities were noted at necropsy.

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 2000 mg/kg body weight (Globally Harmonized Classification System - Unclassified).
Executive summary:

A study was performed to assess the acute oral toxicity of the test item in the Wistar strain rat according to OECD test guideline 420 in a GLP certified laboratory.

Following a sighting test at a dose level of 2000 mg/kg bw, additional four fasted female animals were given a single oral dose of test item, as a suspension in arachis oil BP, at a dose level of 2000 mg/kg bw. Clinical signs and body weight development were monitored during the study. All animals were subjected to gross necropsy.

Results

Mortality. There were no deaths.

Clinical Observations. There were no signs of systemic toxicity.

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

Necropsy: No abnormalities were noted at necropsy.

Based on the findings of the study, the acute oral median lethal dose (LD50) of the test item in the female Wistar strain rat was estimated to be greater than 2000 mg/kg bw (Globally Harmonized Classification System - Unclassified).