Xanthylium, 9-(2-carboxyphenyl)-3,6-bis(diethylamino)-, molybdatesilicate

Endpoint summary

Key value for chemical safety assessment

Acute toxicity: via oral route

Link to relevant study records

Reference

Endpoint:

acute toxicity: oral

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Study period:

This study was conducted between 19 July 2017 and 07 August 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Justification for type of information:

PV1:2 read-across justification to PR81:5 for IUCLID

REPORTING FORMAT FOR THE ANALOGUE APPROACH

1. HYPOTHESIS FOR THE ANALOGUE APPROACH
This read-across is based on the hypothesis that source and target substances have the same type of toxicological effects based on common underlying mechanisms (ECHA, 2015b). All substances have the same organic structural group (colorant) with different compositions of the inorganic group (metallic salt). Read-across is in this case based on the hypothesis that source and target substances have similar toxicological properties because they degrade to the similar chemical substances (ECHA, 2015c). This prediction is supported by physicochemical and toxicological data on the substances.

2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
Name Source Substance Target Substance
IUPAC name Reaction product of 9-(2-carboxyphenyl)-3,6-bis(diethylamino)xanthylium Reaction product of ethyl 2-[3-(ethylamino)-6-ethylimino-2,7-dimethylxanthen-9-yl]
chloride with silicomolybdic acid benzoate with silicomolybdic acid
CAS No 62973-79-9 63022-06-0
EC No 263-778-2 263-793-4
Molecular weight range ≥ 3700 ≤ 8200 ≥ 3700 ≤ 8200
Molecular formula (C28H31N2O3)x.2SiO2.(MoO3)y C28H31N2O3)x.2SiO2.(MoO3)y
x = 6-10 x = 6-10
y = 7-25 y = 7-25


Structural formula Structures are given in the document attached in the section below

Both substances are UVCB’s and so purity is considered to be 100% 
3. ANALOGUE APPROACH JUSTIFICATION
The target substance CAS 62973-79-9 is an organometallic multi-constituent substance. The source substance CAS 63022-06-0 have the same organic constituent (see table above) as the target substance consisting of a basic 3,6-bis(diethylamino)xanthylium structure which has been has additional methyl groups at positions 2,7 (PR81:5, only)and a carboxyphenyl group at position 9 which, for PR81:% only, has an ethyl substitution at position 2.. The inorganic Part B is the same between source and target substances, consisting of the elements O, Mo, P and W in different compositions. These differences are expected to behave very similar. The target and source substances are thus considered suitable for the analogue approach based on structural similarity.
4. DATA MATRIX

Reason / purpose for cross-reference:

read-across source

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 No. 440/2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test type:

fixed dose procedure

Specific details on test material used for the study:

Information as provided by the Sponsor.
Identification: Lumière Pink S.M. 8135N
Batch: 021340
CAS Number: 63022-06-0
EC Number: 263-793-4
Purity: ≥90% UVCB (treat as 100%)
Physical state/Appearance: red powder
Expiry Date: 01 July 2022
Storage Conditions: room temperature in the dark

Species:

rat

Strain:

Wistar

Remarks:

RccHan™:WIST

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 at the start of treatment.

Animal Care and Husbandry
The animals were housed in groups of up to four 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

Route of administration:

oral: gavage

Vehicle:

arachis oil

Details on oral exposure:

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 dose group to confirm the survival of the previously dosed animals.

Test Item Preparation and Analysis
For the purpose of the study the test item was freshly prepared, as required, as a suspension in arachis oil BP. Arachis oil BP was used because the test item did not dissolve/suspend in distilled water.
The test item was formulated within 2 hours of being applied to the test system. It is assumed that the formulation was stable for this duration.
No analysis was conducted to determine the homogeneity, concentration or stability of the test item formulation. This is an exception with regard to GLP and has been reflected in the GLP compliance statement.

Doses:

2000 mg/kg bw

No. of animals per sex per dose:

5

Control animals:

no

Details on study design:

Study Design
Using available information on the toxicity of the test item, 2000 mg/kg was chosen as the starting dose.
A single animal was treated as follows:
Dose Level (mg/kg) Concentration (mg/mL) Dose Volume (mL/kg) Number of Rats
2000 200 10 1

In the absence of toxicity at a dose level of 2000 mg/kg, an additional group of animals was treated as follows:
Dose Level (mg/kg) Concentration (mg/mL) Dose Volume (mL/kg) Number of Rats
2000 200 10 4

A total of five animals were therefore treated at a dose level of 2000 mg/kg in the study.
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 dose group to confirm the survival of the previously dosed animals.
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, early and late during normal working days, and once daily at weekends and public holidays.
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.

Data Evaluation
The test item was classified according to Annex 3 of the OECD Guidelines for Testing of Chemicals No. 420 "Acute Oral Toxicity - Fixed Dose Procedure" (adopted 17 December 2001).
Evaluation of data included identification of the number of animals that died during the study (or that were killed for humane reasons), and determination of the nature, severity, onset and duration of the toxic effects. If possible, the signs of evident toxicity were described. Evident toxicity refers to the toxic effects of sufficient severity that administration of the next higher dose level could result in development of severe signs of toxicity and probable mortality. Effects on body weights and abnormalities noted at necropsy were also identified.
Using the mortality data obtained, an estimate of the acute oral median lethal dose (LD50) of the test item was made

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. Red colored stained feces and urine was noted 1 and 2 days after dosing in the cage of the four additional treated animals. Red stained fur of the four additional treated animals was

Gross pathology:

No abnormalities were noted at necropsy

Table 1 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	160	183	198	23	15
	2-0 Female	157	170	180	13	10
	2-1 Female	166	180	194	14	14
	2-2 Female	157	173	189	16	16
	2-3 Female	160	174	180	14	6

Interpretation of results:

GHS criteria not met

Remarks:

Unclassified

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:

The acute oral median lethal dose (LD₅₀) in the female Wistar strain rat was estimated to be greater than 2000 mg/kg body weight from the acute oral toxicity of source study XG44CC. As explained in the justification for type of information, the difference in molecular structure between the target and source are unlikely to lead to any significant differences in the acute oral toxicity value.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

LD50

Value:

2 000 mg/kg bw

Acute toxicity: via inhalation route

Endpoint conclusion

Endpoint conclusion:

no study available

Acute toxicity: via dermal route

Endpoint conclusion

Endpoint conclusion:

no study available