Diammonium [[N,N'-ethylenebis[N-(carboxymethyl)glycinato]](4-)-N,N',O,O',ON,ON']manganate(2-)

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

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

Adequacy of study:

key study

Study period:

May-June 2010

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: Well conducted study carried out under GLP

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2010

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 423 (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:

Disodium [[N,N'-ethylenebis[N-(carboxymethyl)glycinato]](4-)-N,N',O,O',ON,ON']manganate(2-)

EC Number:

239-407-5

EC Name:

Disodium [[N,N'-ethylenebis[N-(carboxymethyl)glycinato]](4-)-N,N',O,O',ON,ON']manganate(2-)

Cas Number:

15375-84-5

IUPAC Name:

disodium [2,2',2'',2'''-(ethane-1,2-diyldinitrilo)tetraacetato(4-)]manganate(2-)

Details on test material:

Chemical name: Ethylenediaminetetraacetic acid, manganese disodium complex
Purity: 92.3%
Batch no: CFC 9380
Expiry date: 31 August 2012

Test animals

Species:

rat

Strain:

Wistar

Sex:

female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Charles River Deutschland, Sulzfeld, Germany
- Age at study initiation: ca. 10 weeks old
- Weight at study initiation:
- Fasting period before study: animals were deprived of food overnight prior to dosing and until 3-4 hours after administration of the test substance
- Housing: group housing of 3 animals per cage
- Diet (e.g. ad libitum): ad lib
- Water (e.g. ad libitum): ad lib
- Acclimation period: at least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 19.6 – 21.5
- Humidity (%): 38-75
- Air changes (per hr): ca. 15
- Photoperiod (hrs dark / hrs light): 12/12

IN-LIFE DATES: From 27 May To 16 June 2010

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

water

Details on oral exposure:

Study was started with 3 females, later on 3 other females were treated.
Method: Oral gavage, using plastic feeding tubes.
Frequency: Single dosage, on Day 1.
Dose level (volume): 2000 mg/kg (10 mL/kg) body weight.

Doses:

2000 mg/kg bw

No. of animals per sex per dose:

6 females

Control animals:

no

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: twice daily observations on mortality, clinical signs at periodic intervals on the day of dosing (Day 1) and once daily thereafter, until Day 15, weekly weighing
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight,organ weights, histopathology, other: no

Statistics:

Not needed in a limit test

Results and discussion

Effect levels

Sex:

female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

None

Clinical signs:

other: Piloerection or hunched posture were noted in all animals on Day 1

Gross pathology:

No abnormalities were found at macroscopic post mortem examination

Other findings:

No

Applicant's summary and conclusion

Interpretation of results:

study cannot be used for classification

Remarks:

Migrated information

Conclusions:

Because no mortality was observed, the oral LD50 is in excess of 2000 mg/kg bw.

Executive summary:

The study was carried out based on the guidelines described in:

- OECD No.423 (2001) "Acute Oral Toxicity, Acute Toxic Class Method"

- Commission Regulation (EC) No 440/2008, B1 tris: "Acute Oral Toxicity, Acute Toxic Class Method"

- EPA, OPPTS 870.1100 (2002), "Acute Oral Toxicity"

- JMAFF guidelines (2000) including the most recent partial revisions.

EDTA-MnNa2 was administered by oral gavage to two subsequent groups of three female Wistar rats at 2000 mg/kg body weight. Animals were subjected to daily observations and weekly determination of body weight. Macroscopic examination was performed after terminal sacrifice (Day 15).

No mortality occurred. Piloerection or hunched posture were noted in all animals on Day 1. The body weight gain shown by the animals over the study period was considered to be similar to that expected of normal untreated animals of the same age and strain. No abnormalities were found at macroscopic post mortem examination of the animals. The oral LD50 value of EDTA-MnNa2 in Wistar rats was established to exceed 2000 mg/kg body weight. According to the OECD 423 test guideline, the LD50 cut-off value was considered to exceed 5000 mg/kg body weight.