Hydrogen 9-amino-7-phenyl-5-(phenylamino)-4,10-disulphonatobenzo[a]phenazinium, disodium salt

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Study period:

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:

2017

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:

not specified

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:

Hydrogen 9-amino-7-phenyl-5-(phenylamino)-4,10-disulphonatobenzo[a]phenazinium, disodium salt

EC Number:

276-817-3

EC Name:

Hydrogen 9-amino-7-phenyl-5-(phenylamino)-4,10-disulphonatobenzo[a]phenazinium, disodium salt

Cas Number:

72749-80-5

Molecular formula:

C28H20N4O6S2.2Na

IUPAC Name:

Benzo[a]phenazinium, 9-amino-7-phenyl-5-(phenylamino)-4,10-disulfo-, inner salt, sodium salt (1:2)

Test material form:

solid: particulate/powder

Test animals

Species:

rat

Strain:

Wistar

Sex:

female

Details on test animals or test system and environmental conditions:

Animal Information
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:

water

Details on oral exposure:

All animals were dosed once only by gavage

Doses:

2112 mg/kg (equivalent to 2000 mg active ingredient/kg)

No. of animals per sex per dose:

3 females per dose, 2 dose groups

Control animals:

no

Details on study design:

Using available information on the toxicity of the test item, 2112 mg/kg (equivalent to 2000 mg active ingredient/kg body weight) 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)
2112*, 211.2, 10, 3
2112*, 211.2, 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:

act. ingr.

Remarks on result:

other: 95% CL not reported

Mortality:

Individual mortality data are given in Appendix 1.
There were no deaths.

Clinical signs:

other: Individual clinical observations are given in Appendix 1. No signs of systemic toxicity were noted during the observation period. Black staining of the feces was noted in the cage of the second group of animals.

Gross pathology:

Individual necropsy findings are given in Appendix 3.
No abnormalities were noted at necropsy.

Other findings:

None

Any other information on results incl. tables

Appendix1     Individual Clinical Observations and Mortality Data

		Effects Noted After		Dosing (Hours)		Effects Noted During			Period After		Dosing (Days)
Dose Level mg/kg	Animal Number and Sex	½	1	2	4	1F	2F		3F	4	5	6	7	8	9		10		11		12	13	14
2112*	1-0 Female	0	0	0	0	0	0		0	0	0	0	0	0	0		0		0		0	0	0
	1-1 Female	0	0	0	0	0	0		0	0	0	0	0	0	0		0		0		0	0	0
	1-2 Female	0	0	0	0	0	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

*=    Equivalent to 2000 mg active ingredient/kg body weight

0=   No signs of systemic toxicity

F =   Black staining of the feces in the cages of animal numbers 2-0, 2-1 and 2-2

Appendix2     Individual Body Weights and Body Weight Changes

		Body Weight (g) at Day			Body Weight Gain (g) During Week
Dose Level mg/kg	Animal Number and Sex	0	7	14	1		2
2112*	1-0 Female	145	173	186	28		13
	1-1 Female	148	163	176	15		13
	1-2 Female	143	162	173	19		11
	2-0 Female	176	194	209	18		15
	2-1 Female	161	180	199	19		19
	2-2 Female	164	188	204	24		16

*=    Equivalent to 2000 mg active ingredient/kg body weight

Appendix3     Individual Necropsy Findings

Dose Level mg/kg	Animal Number and Sex	Time of Death	Macroscopic Observations
2112*	1-0 Female	Killed Day 14	No abnormalities detected
	1-1 Female	Killed Day 14	No abnormalities detected
	1-2 Female	Killed Day 14	No abnormalities detected
	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

*=    Equivalent to 2000 mg active ingredient/kg body weight

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 2112 mg/kg body weight (equivalent to 2000 mg active ingredient/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 2112 mg/kg body weight (equivalent to 2000 mg active ingredient/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 distilled water. During the 14 day observation period, clinical signs and body weight development were monitored. Thereafter all animals were subjected to gross necropsy.

Results

Mortality. There were no deaths.

Clinical Observations. There were no signs of systemic toxicity. Black staining of the feces was noted in the cage of the second group of animals.

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

Necropsy. No abnormalities were noted at necropsy.

Conclusion

The acute oral median lethal dose (LD₅₀) of the test item in the female Wistar strain rat was estimated to be greater than 2112 mg/kg body weight (equivalent to 2000 mg active ingredient/kg body weight) (Globally Harmonized Classification System - Unclassified).