Disodium {sulfonylbis[4,1-phenylenediazene-2,1-diyl(1-ethyl-6-hydroxy-4-methyl-2-oxo-1,2-dihydropyridine-5,3-diyl)]}dimethanesulfonate

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

Experimental Starting Date: 14-Sep-2010 Experimental Completion Date: 07-Oct-2010

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

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. The study report was conclusive, done to a valid guideline and the study was conducted under GLP conditions.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2010

Report date:

2010

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)

Deviations:

no

Test guideline 2

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

Test material information

Constituent 1

Reference substance name:

Acid Yellow RN 2903

IUPAC Name:

Acid Yellow RN 2903

Details on test material:

Identification: Acid Yellow RN 2903
Description: Yellow to orange powder
Batch Number: Vers. Kilo 6, 26.05.2009
Purity: 65.7 %
Correction Factor for the Purity: No
Stability of Test Item: Stable under storage conditions
Stability of Test Item Dilution: Stable in water for 4 days
Expiry Date: 01-Aug-2015
Storage Conditions: At room temperature (range of 20 ± 5 °C, provided by Harlan Laboratories Ltd.), light protected.
Safety Precautions: Routine hygienic procedures were used to ensure the health and safety of the personnel.

Test animals

Species:

rat

Strain:

Wistar

Sex:

female

Details on test animals or test system and environmental conditions:

Test Animals:
Animals: Rat, RccHan: WIST(SPF)
Rationale: Recognized by international guidelines as a recommended test system.
Breeder: Harlan Laboratories B.V., Kreuzelweg 53, 5961 NM Horst / The Netherlands
Number of Animals per Group: 3 females
Total Number of Animals: 6 females
Age (when treated): 10 weeks
Body Weight Range (when treated): 179.3 g – 195.9 g
Identification: Unique cage number and corresponding color-coded spots on the tail. The animals were marked at acclimatization start.
Randomization: Selected by hand at time of delivery.
Acclimatization: 7 (Group 1) or 9 (Group 2) days under laboratory conditions, after health examination. Only animals without any visible signs of illness were used for the study.

Environmental Conditions:
Conditions: Standard Laboratory Conditions. Air-conditioned with 10-15 air changes per hour, and continuously monitored environment with a room temperature of 22 ± 3 °C and a relative humidity between 30-70%, automatically controlled light cycle of 12 hours light and 12 hours dark and music played during the daytime light period.
Accommodation: In groups of three in Makrolon type-4 cages with wire mesh tops and standard softwood bedding (‘Lignocel’ J. Rettenmaier&Söhne GmbH&CoKG, 73494 Rosenberg / Germany, imported by Provimi Kliba AG, 4303 Kaiseraugst / Switzerland). Paper enrichment, Reference no. 207057, batch no. 67, (Enviro-dri from Lillico, Biotechnology, Surrey / UK) was included.
Diet: Pelleted standard Teklad Rat-Mouse Diet 2914C, irradiated, batch no. 30/10 (Provimi Kliba AG, 4303 Kaiseraugst / Switzerland) ad libitum (except for the overnight fasting period prior to intubation and approximately 3-4 hours post dose). Results of analyses for contaminants are archived at Harlan Laboratories Ltd.
Water: Community tap water from Füllinsdorf ad libitum. Results of bacteriological, chemical and contaminant analyses are archived at Harlan Laboratories Ltd.

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

water

Details on oral exposure:

The animals received a single dose of the test item by oral gavage administration at 2000 mg/kg body weight after being fasted for approximately 17-18 hours (access to water was permitted). Food was provided again approximately 3 hours after dosing.

The dosing volume was 10 mL/kg body weight.

Rationale: Oral administration was considered to be an appropriate application method as it is a possible route of human exposure during manufacture, handling and use of the test item.

Doses:

2000 mg/kg body weight

No. of animals per sex per dose:

3

Control animals:

no

Details on study design:

Purpose:
The purpose of this study was to assess the acute toxicity of Acid Yellow RN 2903 when administered by single oral gavage to rats, followed by an observation period of 14 days. This study provides information for both hazard assessment and hazard classification purposes.

Vehicle:
The vehicle was chosen after a non-GLP solubility trial which was performed before the study initiation date. Therefore, solubility testing was excluded from the statement of compliance. The test item was prepared at 20% (w/w) in purified water, which was soluble after treatment with an Ultra Turrax. Therefore, this concentration was considered orally applicable. The following information was provided by Harlan Laboratories Ltd.:
Purified water was prepared at Harlan Laboratories Ltd. (deionised water which was processed and treated by the PURELAB Option-R unit, linking four purification technologies: reverse osmosis, adsorption, ion-exchange and photo oxidation).

Preparation of Dose Formulations:
Dose levels are in terms of the test item as supplied by the Sponsor. The dose formulations were prepared shortly before each dosing occasion using a magnetic stirrer, a spatula and an Ultra-Turrax as homogenizers. The test item was weighed into a tared glass beaker on a suitable precision balance and the vehicle added (weight:volume). Homogeneity of the test item in the vehicle was maintained during administration using a magnetic stirrer.

Observations:
Viability / Mortality: Daily during acclimatization. Once before treatment and within the first 30 minutes and at approximately 1, 2, 3 and 5 hours after treatment on test day 1 (in common with the clinical signs). Twice daily during test days 2 – 15.
Clinical Signs: Daily during acclimatization and treatment. Additionally, within the first 30 minutes and at approximately 1, 2, 3 and 5 hours after administration on test day 1.
Body Weights: On test days 1 (prior to administration), 8 and 15.

Pathology:
Necropsy: All animals were killed at the end of the observation period by carbon dioxide asphyxiation and discarded after macroscopic examinations were performed. An external examination and opening of the abdominal and thoracic cavities for examinations of major organs was performed. The
appearance of any macroscopic abnormalities was recorded. No organs or tissues were retained.

Data Compilation:
Viability/mortality was recorded on data sheets. Body weights were recorded on-line with the ToxControl Computer System. Clinical signs, local dermal signs, mortality data and macroscopic findings were compiled into the ToxControl Computer System during recording. The ToxControl Computer System has been licenced for Harlan Laboratories Ltd. and validated with respect to data collection, storage and retrievability.

Statistics:

No statistical analysis was performed

Results and discussion

Effect levels

Sex:

female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

No deaths occurred during the course of the study.

Clinical signs:

other: No clinical signs were observed throughout the entire observation period.

Gross pathology:

No macroscopic findings were recorded at necropsy.

Any other information on results incl. tables

Due to the nature and quantitiy of the tables, all tables have been attached in the attached section.

Applicant's summary and conclusion

Conclusions:

The median lethal dose of Acid Yellow RN 2903 after single oral administration to female rats, observed over a period of 14 days, is:
LD50 (female rat): greater than 2000 mg/kg body weight

Executive summary:

Two groups, each consisting of three female RccHan:WIST (SPF) rats, were treated with Acid Yellow RN 2903 by single oral gavage administration at a dose of 2000 mg/kg body weight. The test item was formulated in purified water at a concentration of 0.2 g/mL and administered at a dosing volume of 10 mL/kg. The animals were examined daily during the acclimatization period and mortality, viability and clinical signs were recorded. All animals were examined for clinical signs before treatment, within the first 30 minutes and approximately 1, 2, 3 and 5 hours after treatment on test day 1 and once daily during test days 2-15. Mortality/viability was recorded before treatment, within the first 30 minutes and approximately 1, 2, 3 and 5 hours after administration on test day 1 (with the clinical signs) and twice daily during test days 2-15. Body weights were recorded on test day 1 (prior to administration) and on test days 8 and 15. All animals were necropsied and examined macroscopically.

No deaths occurred during the course of the study.

No clinical signs were observed during the course of the study.

The body weight of the animals was within the range commonly recorded for this strain and age.

No macroscopic findings were recorded at necropsy.

The median lethal dose of Acid Yellow RN 2903 after single oral administration to female rats, observed over a period of 14 days, is:

LD50 (female rat): greater than 2000 mg/kg body weight