Lithium bis[ethanedioato(2-)-κO1,κO2]difluorophosphate(1-)

Toxicity to reproduction

Administrative data

Endpoint:

screening for reproductive / developmental toxicity

Type of information:

experimental study

Adequacy of study:

key study

Study period:

From 2015-02-25 to 2015-06-04

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:

2016

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 421 (Reproduction / Developmental Toxicity Screening Test)

Version / remarks:

1995

Deviations:

no

GLP compliance:

no

Remarks:

non GLP, but in compliance with China National Metrology Accreditation

Limit test:

no

Test material

Test material information

Constituent 1

Reference substance name:

Lithium bis[ethanedioato(2-)-κO1,κO2]difluorophosphate(1-)

EC Number:

695-938-6

Cas Number:

678966-16-0

Molecular formula:

F2C4PLiO8

IUPAC Name:

Lithium bis[ethanedioato(2-)-κO1,κO2]difluorophosphate(1-)

Test material form:

solid: particulate/powder

Specific details on test material used for the study:

Batch No.: 141104
Purity: 95.4%

Test animals

Species:

rat

Strain:

Sprague-Dawley

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Age at study initiation: 8-9 weeks old
- Weight at study initiation: Males: 291 - 350 g, Females: 210 - 243 g, not exceed ±20 per cent of the mean weight.
- Housing: housed in suspended, wire bottom, stainless steel cages
- Diet (e.g. ad libitum): ad libitum
- Water (e.g. ad libitum): ad libitum
- Acclimation period: More than 5 days.

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 23 °C ± 3 °C
- Humidity (%): 40 - 70%
- Photoperiod (hrs dark / hrs light): 12-hour light / dark crycle
- Air changes / hour: 12

Administration / exposure

Route of administration:

oral: feed

Vehicle:

unchanged (no vehicle)

Details on exposure:

DIET PREPARATION
Weighed test substance required, take a small amount of blank feeds mixed with test substance and then mixed with the blank feed gradually expand to reach the designed concentration and to have better exposure to the homogeneity of the test substance, formed different concentrations of powdered feed.

Details on mating procedure:

- M/F ratio per cage: 1 to 1
- Length of cohabitation:14 days
- Proof of pregnancy: vaginal plug or sperm in vaginal smear referred to as day 0 of pregnancy

Analytical verification of doses or concentrations:

no

Duration of treatment / exposure:

Male rats were exposed more than 2 weeks before mating and 2 weeks during mating, the total exposure time should not be less than 4 weeks; female rats were exposed more than 2 weeks before mating, 2 weeks during mating, and the period of gestation, and lactation , and finished on 4th days of the lactation.

Doses / concentrations

Doses / concentrations 1

Dose / conc.:

0 mg/kg diet

Doses / concentrations 2

Dose / conc.:

50 mg/kg diet

Doses / concentrations 3

Dose / conc.:

200 mg/kg diet

Doses / concentrations 4

Dose / conc.:

800 mg/kg diet

No. of animals per sex per dose:

12

Control animals:

yes, concurrent no treatment

Details on study design:

- Dose selection rationale: Based upon repeated dose 28-day oral toxicity study NOAEL values (147 mg/kg) on female rats and 316 mg/kg on male rats), SD rats were randomly assigned to four groups: one control group, one low dose level group, one intermediate dose level group and one high dose level group. The dosages of the groups were 0, 50, 400 and 800 mg/kg feed respectively.
- Rationale for animal assignment (if not random): Random

Examinations

Parental animals: Observations and examinations:

Observation period: Males were observed for a minimum of four weeks, including prior to mating (a minimum of two weeks), mating and post-mating period; females were observed for a minimum of two weeks prior to mating, during the mating, the duration of pregnancy and at least four days after delivery.

GENERAL CLINICAL OBSERVATIONS: Yes
- Time schedule: At least once a day, and more frequently when signs of toxicity were observed.

BODY WEIGHT: Yes
- Time schedule for examinations: each animal should be weighed on the first day of dosing, once per week thereafter and at termination. Pregnant females should be weighed on days 0, 7, 14, and 20 during pregnancy and on days 0, 4 after delivery.

FOOD CONSUMPTION:
- Time schedule: measured at least weekly

Sperm parameters (parental animals):

Parameters examined in male parental generations:
Detailed histological examination should be performed on the testes and epididymides (with special emphasis on stages of spermatogenesis and histopathology of interstitial testicular cell structure)

Litter observations:

PARAMETERS EXAMINED
The following parameters were examined in F1 offspring:
Pups in each litter were weighed on day 0 and 4 post-partum. Each litter should be examined as soon as possible after delivery to establish the number and sex of pups, stillbirths, live births, runts (pups that significantly smaller than corresponding control pups) and the presence of gross abnormalities. The stillbirths and pups at the time of sacrifice should be examined for gross abnormalities.

Postmortem examinations (parental animals):

GROSS NECROPSY:
The adult animals should be examined macroscopically for any abnormalities or pathological changes. Special attention should be paid to the organs of the reproductive system. The number of implantation sites and corpora lutea should be recorded. The testes and epididymides of all male adult animals should be weighed. The ovaries, testes, epididymides, accessory sex organs and all organs showing macroscopic lesions of all adult animals should be preserved in Bouin's fixative.
HISTOPATHOLOGY:
Detailed histological examination should be performed on the ovaries, testes and epididymides (with special emphasis on stages of spermatogenesis and histopathology of interstitial testicular cell structure) and all organs showing macroscopic lesions.

Reproductive indices:

Rate of mating success (%) = (number of successful mating animals / number of female animal for mating) x 100 %
Rate of pregnancy (%) = (number of pregnant animals / number of female animal for mating) x100 %

Offspring viability indices:

Rate of live birth (%) = (number of female animals producing live offspring / number of pregnant animals) x 100 %
Rate of birth livability (%) = (number of offspring survived on day 4 post-partum / number of offspring survived on day 0 post-partum) x100 %

Results and discussion

Results: P0 (first parental generation)

General toxicity (P0)

Clinical signs:

no effects observed

Mortality:

no mortality observed

Body weight and weight changes:

effects observed, non-treatment-related

Description (incidence and severity):

The body weight changes of parental rats during periods of pre-mating and mating: There were no significant differences in the body weight of parental rats during periods of pre-mating and mating between the control group and the dose groups.
The body weight changes of pregnant rats: There were no significant differences in the body weight on day 0, 7, 14, 20 and the body weight gain during pregnancy between the control group and the dose groups.
The body weight changes of maternal rats during lactation period: There were no significant differences in the body weight changes of the maternal rats during lactation period between the control group and the dose groups.

Food consumption and compound intake (if feeding study):

effects observed, treatment-related

Description (incidence and severity):

Compared with the control group, in the low and intermediate dose level groups, the average food consumption of parental rats were reduced, the differences were significant, but no dose-effect relationship was investigated.

Organ weight findings including organ / body weight ratios:

effects observed, non-treatment-related

Histopathological findings: non-neoplastic:

effects observed, non-treatment-related

Description (incidence and severity):

There were no significant differences between control group and dose groups.

Other effects:

effects observed, non-treatment-related

Description (incidence and severity):

Mating and gestation:
12 pairs were arranged for mating in control, low, intermediate and high dose groups, respectively, in which 12,12,12,12 pairs were successful mating, 12, 11 ,12,12 females were pregnant, respectively. The date of pregnancy was in the first estrous period after mating, and the most duration of gestation was 22-23 days. There were no significant differences in above parameters.
Analysis of offspring loss:
There were no significant differences in offspring 10ss in different period between control group and dose groups.
Propagation index:
There were no significant differences in the ratios of successful mating, pregnancy, live birth and birth livability between control group and dose groups.
Gross necropsy:
There were no abnormality in gross necropsy on parental rats of each group.

Effect levels (P0)

1

Key result

Dose descriptor:

NOAEL

Effect level:

800 mg/kg diet

Based on:

test mat.

Sex:

female

Basis for effect level:

other: No obvious reproductive and developmental toxicity was observed in the dose groups.

2

Key result

Dose descriptor:

NOAEL

Effect level:

800 mg/kg diet

Based on:

test mat.

Sex:

male

Basis for effect level:

other: No obvious reproductive and developmental toxicity was observed in the dose groups.

3

Key result

Dose descriptor:

NOAEL

Effect level:

91.38 mg/kg bw/day (actual dose received)

Based on:

test mat.

Sex:

female

Basis for effect level:

other: No obvious reproductive and developmental toxicity was observed in the dose groups.

4

Key result

Dose descriptor:

NOAEL

Effect level:

80.74 mg/kg bw/day (actual dose received)

Based on:

test mat.

Sex:

male

Basis for effect level:

other: No obvious reproductive and developmental toxicity was observed in the dose groups.

Target system / organ toxicity (P0)

Key result

Critical effects observed:

no

Results: F1 generation

General toxicity (F1)

Other effects:

effects observed, non-treatment-related

Description (incidence and severity):

The number of corpora lutea and implantation sites, litter weight and situation of pups:
Compared with the control group, there were no significant differences in the average numbers of corpus luteum, implantations, the average number of surviving pups at day 0 and 4, the litter weight at day 0 and 4, average weight of pups at day 0 and 4 in each group.
The abnormalities of pups:
There were no abnormalities on appearance of pups and short stature pups.

Effect levels (F1)

Key result

Generation:

F1

Remarks on result:

not measured/tested

Overall reproductive toxicity

Key result

Reproductive effects observed:

no

Applicant's summary and conclusion

Conclusions:

The NOAEL of the test substance was 800 mg/kg feed in female rats and 800 mg/kg feed in male rats. Converted into average daily intake of the sample, the NOAEL was 91.38 mg/kg bw/day in female rats and 80.74 mg/kg bw/day in male rats.

Executive summary:

The evaluation of possible effects on reproduction and / or development in male and female Sprague-Dawley (SD) rats was conducted on the test substance using reproduction and developmental toxicity screening test according to OECD Guideline 421.

96 SD rats of 8-9 weeks old were randomly divided into the 4 groups using mixed feed method with the concentration of 0, 50, 200, 800 mg/kg feed. Male rats were exposed to a minimum of 4 weeks, the exposure time of female rats includes the pre-mating period (2 weeks), mating, gestation and lactation period (4 days). Rats were mated by one male to one female after two weeks of exposure. The test was finished on day 4 post partum. At the time of sacrifice or death during the study, the adult animals were examined macroscopically for any abnormalities or pathological changes and detailed histological examination were performed on the organs of the reproductive system. The numbers of implantation sites and corpora lutea were recorded.

 

Results showed that compared with the control group, there were no significant abnormalities in the body weight and in the food consumption in each exposure groups. There were no abnormalities in the coefficients of testis and epididymis of parental male rats. No clinical signs and death of parental rats were observed in each treated group. No significant abnormality was found in dose groups on parental gross anatomy and histopathology compared with the control group.

Compared with the control group, there were no significant differences in the average numbers of corpus luteum, implantations, the average number of surviving pups at day 0 and 4, the litter weight at day 0 and 4, average weight of pups at day 0 and 4 in each group. There were no abnormalities on appearance of pups in each group, no runts were found in each group. There were no significant differences in propagation indexes such as the ratios of successful mating, pregnancy, live birth and birth livability between control group and dose groups. In this test, no obvious reproductive and developmental toxicity was observed in the dose groups.

 

The NOAEL of the test substance was 800 mg/kg feed in female rats and 800 mg/kg feed in male rats. Converted into average daily intake of the sample, the NOAEL was 91.38 mg/kg bw/day in female rats and 80.74 mg/kg bw/day in male rats.