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Administrative data

Endpoint:
acute toxicity: oral
Type of information:
experimental study
Adequacy of study:
key study
Study period:
November 20, 2014 - December 9, 2014
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The study has been performed according to OECD and/or EC guidelines and according to GLP principles.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2015
Report date:
2015

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)
Version / remarks:
(2001)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method B.1 tris (Acute Oral Toxicity - Acute Toxic Class Method)
Version / remarks:
(2008)
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 870.1100 (Acute Oral Toxicity)
Version / remarks:
(2002)
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: Japanese Ministry of Agriculture, Forestry and Fisheries (JMAFF), 12 Nousan, Notification No 8147, November 2000, including the most recent partial revisions.
Deviations:
no
GLP compliance:
yes
Test type:
acute toxic class method
Limit test:
yes

Test material

Constituent 1
Chemical structure
Reference substance name:
Strontium tartrate
EC Number:
212-774-9
EC Name:
Strontium tartrate
Cas Number:
868-19-9
Molecular formula:
C4H4O6Sr
IUPAC Name:
strontium(2+) 2,3-dihydroxybutanedioate
Details on test material:
- Name of test material (as cited in study report): Strontium tartrate (anhydrous)
- Appearance: Off-white powder

Test animals

Species:
rat
Strain:
other: Crl:WI (Han)
Sex:
female
Details on test animals or test system and environmental conditions:
- Source: Charles River Deutschland, Sulzfeld, Germany
- Age at study initiation: Young adult animals (approx. 10-11 weeks old)
- Weight at study initiation: 168-179 g (1st group) and 183-195 g (2nd group)
- Fasting period before study: Animals were deprived of food overnight prior to dosing
- Housing: Group housing of 3 animals per cage in labeled Macrolon cages
- Diet: Free access to pelleted rodent diet (SM R/M-Z from SSNIFF® Spezialdiäten GmbH, Soest, Germany)
- Water: Free access to tap water
- Acclimation period: At least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 18 – 24
- Humidity (%): 40 - 70
- Air changes (per hr): at least 10
- Photoperiod (hrs dark / hrs light): 12/12

IN-LIFE DATES: From: November 20, 2014 To: December 9, 2014

Administration / exposure

Route of administration:
oral: gavage
Vehicle:
other: 1% Aqueous carboxymethyl cellulose
Details on oral exposure:
GAVAGE METHOD: plastic feeding tubes.

Frequency: single dosage, on Day 1.

VEHICLE
- The vehicle was selected based on trial formulations performed at WIL Research Europe and on test substance data supplied by the sponsor.

MAXIMUM DOSE VOLUME APPLIED: 2000 mg/kg bw (10 mL/kg bw)

DOSAGE PREPARATION
The formulations (w/v) were kept at room temperature dosed within 4 hours after adding the vehicle to the test substance. Homogeneity was obtained to visually acceptable levels. No correction was made for purity of the test substance.
Doses:
2000 mg/kg body weight
No. of animals per sex per dose:
6 (2 groups of three females in a stepwise manner)
Control animals:
no
Details on study design:
Animals were deprived of food until 3-4 hours after administration of the test substance.

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing:
Mortality/Viability: Twice daily
Body weights: Days 1 (pre-administration), 8 and 15
Clinical signs: At periodic intervals on the day of dosing (Day 1) and once daily thereafter, until Day 15.
- Necropsy of survivors performed: At the end of the observation period, all animals were sacrificed by oxygen/carbon dioxide procedure and subjected to necropsy. Descriptions of all internal macroscopic abnormalities were recorded.
- Other examinations performed: none
Statistics:
No statistical analysis was performed (The method used is not intended to allow the calculation of a precise LD50 value).

Results and discussion

Effect levels
Sex:
female
Dose descriptor:
LD50
Effect level:
> 2 000 mg/kg bw
Based on:
test mat.
Remarks on result:
other: No mortality occurred.
Mortality:
No mortality occurred.
Clinical signs:
Hunched posture was noted for all animals on Day 1 and also on Day 2 for four animals. Additionally, piloerection was noted for three animals on Days 1 and 2.
Body weight:
The body weight gain shown by the animals over the study period was considered to be similar to that expected for normal untreated animals of the same age and strain.
Gross pathology:
No test substance related abnormalities were found.

Applicant's summary and conclusion

Interpretation of results:
not classified
Remarks:
Migrated information Criteria used for interpretation of results: EU
Conclusions:
In an acute oral toxicity study with Strontium tartrate (anhydrous) in rats, performed according to OECD/EC test guidelines, an LD50 >2000 mg/kg bw was determined.
Executive summary:

The acute oral toxicity of Strontium tartrate (anhydrous) was determined in accordance with OECD 423 (2001) and according to GLP principles. The substance was administered by oral gavage to two subsequent groups of three female Wistar rats at 2000 mg/kg body weight. No mortality occurred. Hunched posture was noted for all animals on Day 1 and also on Day 2 for four animals. Additionally, piloerection was noted for three animals on Days 1 and 2. Necropsy did not show any abnormality. The acute oral toxicity (LD50) was determined to be >2000 mg/kg bw. Based on this result, the substance does not need to be classified for acute toxicity by the oral route.