Dimethyl sulphone

Endpoint summary

Key value for chemical safety assessment

Toxic effect type:

dose-dependent

Effects on fertility

Description of key information

Reproductive toxicity study

Based on the data available from given study .NOAEL for test material was considered to be 1000mg/kg /day for reproductive toxicity, when male and female rats were treated with test material orally. Thus, comparing this value with the criteria of CLP regulation test material is not likely to classify as reproductive toxicant.

Link to relevant study records

Reference

Endpoint:

screening for reproductive / developmental toxicity

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Justification for type of information:

Data is from peer-reviewed journal.

Qualifier:

according to guideline

Guideline:

other: US Food and Drug Administration principles (FDA, 1982) and Organization for Economic Co-operation and Development (OECD) guidelines for developmental toxicity (No. 414) (OECD, 2006).

Principles of method if other than guideline:

The present study was undertaken to determine the reproductive toxicity potential of test chemical.when administered orally to rats during the period of major organogenesis and histogenesis.

GLP compliance:

not specified

Limit test:

no

Specific details on test material used for the study:

SOURCE OF TEST MATERIAL
- Source of test material: Cardinal Nutrition, Inc. (Vancouver, WA).
- Expiration date of the lot/batch: No data
- Purity: 99.9%

RADIOLABELLING INFORMATION (Not applicable)
- Radiochemical purity: N/A
- Specific activity: N/A
- Locations of the label: N/A
- Expiration date of radiochemical substance: N/A

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: stored at room temperature.
- Stability under test conditions: the formulations were stable for 32 days for concentrations ranging from 10 to 100 mg/ml when stored at room temperature.
- Solubility and stability of the test substance in the solvent/vehicle: No data
- Reactivity of the test substance with the solvent/vehicle of the cell culture medium: No data

TREATMENT OF TEST MATERIAL PRIOR TO TESTING
- Treatment of test material prior to testing: No data
- Preliminary purification step (if any): No data
- Final dilution of a dissolved solid, stock liquid or gel: No data
- Final preparation of a solid: No data

FORM AS APPLIED IN THE TEST (if different from that of starting material): No data

OTHER SPECIFICS: No data

Species:

rat

Strain:

Sprague-Dawley

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Taconic Farms, Germantown, NY
- Females (if applicable) nulliparous and non-pregnant: [yes]
- Age at study initiation: 7 to 9 weeks
- Weight at study initiation: between 145 and 215 g/rat
- Fasting period before study: No data available
- Housing: Quarantine in plastic cages
- Use of restrainers for preventing ingestion (if dermal): no
- Diet (e.g. ad libitum): Harlan Teklad Certified Rodent Diet #8728C, ad libitum
- Water (e.g. ad libitum): ad libitum
- Acclimation period: 2 weeks

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22 ± 4 degC
- Humidity (%): No data available
- Air changes (per hr): No data available
- Photoperiod (hrs dark / hrs light): 12-h light/dark cycle

IN-LIFE DATES: From: To: No data available

Route of administration:

oral: gavage

Type of inhalation exposure (if applicable):

not specified

Vehicle:

water

Details on exposure:

PREPARATION OF DOSING SOLUTIONS: Formulations were prepared in deionized water at 10, 100, and 200 mg/ml concentrations for the 50, 500, and 1000 mg/kg dose levels, respectively.

DIET PREPARATION
- Rate of preparation of diet (frequency):No data
- Mixing appropriate amounts with (Type of food): No data
- Storage temperature of food: No data

VEHICLE
- Justification for use and choice of vehicle (if other than water): No data
- Concentration in vehicle: 50, 500,1000 mg/kg
- Amount of vehicle (if gavage): 5 ml/kg
- Lot/batch no. (if required): No data
- Purity: No data

Details on mating procedure:

- M/F ratio per cage: 1:1 mating scheme (i.e., one male:one female)
- Length of cohabitation: overnight
- Proof of pregnancy: sperm in vaginal smear referred to as day 0 of pregnancy
- After ... days of unsuccessful pairing replacement of first male by another male with proven fertility. No data available
- Further matings after two unsuccessful attempts: no
- After successful mating each pregnant female was caged (how): males were removed and females were individually housed for the rest of the experiment.
- Any other deviations from standard protocol: To facilitate the teratogenic evaluation of pups, a staggered-start design (via staggered mating) was employed. Mating was staggered over six days resulting in six series.

Analytical verification of doses or concentrations:

yes

Details on analytical verification of doses or concentrations:

Aliquots of the formulations were transferred to dosing vials and samples representing each dose level from the first preparation were analyzed by gas chromatography. The purity of test chemical was 99.9%.

Duration of treatment / exposure:

14 days (on gestation days 6–20)
Total exposure period: 20 days

Frequency of treatment:

Daily

Details on study schedule:

Terminal killing: 21st day of gestation

Dose / conc.:

0 other: mg/kg

Remarks:

vehicle group

Dose / conc.:

50 other: mg/kg

Dose / conc.:

500 other: mg/kg

Dose / conc.:

1 000 other: mg/kg

No. of animals per sex per dose:

Total: 98
0 mg/kg/day : 25 timed-bred primiparous dams
50 mg/kg/day : 24 timed-bred primiparous dams
500 mg/kg/day : 25 timed-bred primiparous dams
1000 mg/kg/day : 24 timed-bred primiparous dams

Control animals:

yes

Details on study design:

No data available

Positive control:

No data available

Parental animals: Observations and examinations:

CAGE SIDE OBSERVATIONS: No data
- Time schedule:
- Cage side observations checked in table [No.?] were included.

DETAILED CLINICAL OBSERVATIONS: Yes
- Time schedule:

BODY WEIGHT: Yes
- Time schedule for examinations: Body weights were recorded on gestation days 0 (sperm-positive day/randomization), 3, 6, 9, 12, 15, 18, and 21.

FOOD CONSUMPTION AND COMPOUND INTAKE (if feeding study): Yes
- Feed consumption was calculated for each period between weighings.

WATER CONSUMPTION AND COMPOUND INTAKE (if drinking water study): No data
- Time schedule for examinations:

Oestrous cyclicity (parental animals):

No data available

Sperm parameters (parental animals):

No data available

Litter observations:

No data available

Postmortem examinations (parental animals):

SACRIFICE
All dams were euthanized using CO2 asphyxiation on their 21st day of gestation and underwent a cesarean section.

GROSS NECROPSY
Gross necropsy consisted of examination of the brain and all organs in the thoracic and abdominal cavities of the dams.
Pregnancy status, number of corpora lutea was examined.
The uterus and ovaries were weighed.

Postmortem examinations (offspring):

GROSS NECROPSY
- Gross necropsy consisted of external morphological and internal examinations including the cervical, thoracic, and abdominal viscera.

Statistics:

Dam weights, litter body weights, and viability data were analyzed by a two-way analysis of variance (ANOVA). In the presence of a significant main effect, all post-hoc comparisons were performed using Dunnett’s test (two-tail). Gross, visceral, cephalic, and skeletal data were analyzed by Chi-Square/Fisher’s Exact tests (fetal N) when incidence in the treated rats was higher (i.e., when the difference in the absolute number of fetuses affected is greater than three) than controls. A minimum statistical significance level of p ≤ 0.05 was used in all cases.

Reproductive indices:

No data available

Offspring viability indices:

No data available

Clinical signs:

no effects observed

Description (incidence and severity):

No clinical signs of toxicity were observed.

Dermal irritation (if dermal study):

not examined

Mortality:

not specified

Body weight and weight changes:

no effects observed

Description (incidence and severity):

Body weight was similar among all groups.

Food consumption and compound intake (if feeding study):

no effects observed

Description (incidence and severity):

Feed consumption was not affected.

Food efficiency:

not specified

Water consumption and compound intake (if drinking water study):

not specified

Ophthalmological findings:

not specified

Haematological findings:

not specified

Clinical biochemistry findings:

not specified

Urinalysis findings:

not specified

Behaviour (functional findings):

not specified

Immunological findings:

not specified

Organ weight findings including organ / body weight ratios:

no effects observed

Histopathological findings: non-neoplastic:

no effects observed

Description (incidence and severity):

No histopathological lesions in organ and tissues were observed.

Histopathological findings: neoplastic:

not specified

Other effects:

not specified

Reproductive function: oestrous cycle:

not specified

Reproductive function: sperm measures:

not specified

Reproductive performance:

effects observed, treatment-related

Description (incidence and severity):

No evidence of maternal toxicity was observed.

No evidence of maternal toxicity was observed.

Dose descriptor:

NOAEL

Effect level:

1 000 mg/kg bw/day

Based on:

test mat.

Sex:

female

Basis for effect level:

clinical signs

body weight and weight gain

food consumption and compound intake

organ weights and organ / body weight ratios

gross pathology

histopathology: non-neoplastic

reproductive performance

Remarks on result:

other: No evidence of maternal toxicity was observed.

Critical effects observed:

not specified

System:

other: not specified

Organ:

not specified

Clinical signs:

no effects observed

Description (incidence and severity):

No clinical signs were observed.

Dermal irritation (if dermal study):

not examined

Mortality / viability:

no mortality observed

Body weight and weight changes:

no effects observed

Food consumption and compound intake (if feeding study):

not specified

Food efficiency:

not specified

Water consumption and compound intake (if drinking water study):

not specified

Ophthalmological findings:

not specified

Haematological findings:

not specified

Clinical biochemistry findings:

not specified

Urinalysis findings:

not specified

Sexual maturation:

not specified

Organ weight findings including organ / body weight ratios:

not specified

Gross pathological findings:

effects observed, treatment-related

Description (incidence and severity):

Oral administration of test chemical to pregnant rats at doses of 50, 500, or 1000 mg/kg/day did not result in any structural malformations or fetal anomalies as evaluated by gross external, cephalic, visceral and skeletal examinations.

Histopathological findings:

not specified

Other effects:

not specified

Behaviour (functional findings):

not specified

Developmental immunotoxicity:

not specified

No significant differences in litter viability, litter size, or litter body weight were detected. Fetal evaluations failed to show any biologically significant increase in the incidence of anomalies in the treated groups, and no malformations were seen in any of the fetuses. No evidence of fetal mortality, alterations to growth, or structural alterations were observed in the fetuses of dams administered 50–1000 mg/kg/day.

Embryo-fetal toxicity summary
No evidence of embryo or fetal toxicity, or treatment related alterations in fetal body weights or fetal examinations (gross external, visceral, cephalic, or skeletal) was observed in this study at doses up to 1000 mg/kg .

Dose descriptor:

NOAEL

Generation:

F1

Effect level:

1 000 mg/kg bw/day

Based on:

test mat.

Sex:

female

Basis for effect level:

viability

clinical signs

mortality

body weight and weight gain

gross pathology

other: Fetotoxicity

Remarks on result:

other: No evidence of embryo-fetal toxicity was observed.

Critical effects observed:

not specified

System:

other: not specified

Organ:

not specified

Reproductive effects observed:

not specified

Treatment related:

not specified

Conclusions:

Under the conditions of this study, the no-observed-adverse-effect level (NOAEL) for maternal and developmental toxicity was considered to be 1000 mg/kg/day.When female rats were treated with test chemical orally.

Executive summary:

The objective of the study was to determine the reproductive toxicity potential of test chemical when administered orally to pregnant rats during the period of major organogenesis and histogenesis. In a preliminary dose-finding study, distilled microprill (i.e., microspherical pellets of test chemical ) was administered by oral gavage at dose levels of 0 (vehicle control), 50, 250, 500, and 1000 mg/kg/day to 8–9 sperm-positive female Sprague–Dawley rats/group/day on gestation days 6–20. No evidence of maternal or fetal toxicity was observed. For the definitive study, four groups of 24–25 timedbred primiparous female rats were administered 0, 50, 500, or 1000 mg /kg/day via gavage on gestation days 6–20. Maternal feed consumption, body weight, body weight gain, uterus weight and corrected body weight/body weight gain were unaffected by treatment. No evidence of maternal toxicity, and no significant differences in litter viability, litter size, or litter body weight were detected. Fetal evaluations failed to show any biologically significant increase in the incidence of anomalies in the treated groups, and no malformations were seen in any of the fetuses. No evidence of fetal mortality, alterations to growth, or structural alterations were observed in the fetuses of dams administered 50–1000 mg/kg/day. Therefore, under the conditions of this study, the no-observed-adverse-effect level (NOAEL) for maternal and developmental toxicity was considered to be 1000 mg/kg/day.When female rats were treated with test chemical orally.

Effect on fertility: via oral route

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

NOAEL

1 000 mg/kg bw/day

Study duration:

subacute

Species:

rat

Quality of whole database:

Data is Klimicsh 2 and from authoritative database

Effect on fertility: via inhalation route

Endpoint conclusion:

no study available

Effect on fertility: via dermal route

Endpoint conclusion:

no study available

Additional information

Reproductive toxicity study

Data available from given study was reviewed to determine the reproductive toxicity of test chemical.The study as mentioned below:

The objective of the study was to determine the reproductive toxicity potential of test chemical when administered orally to pregnant rats during the period of major organogenesis and histogenesis. In a preliminary dose-finding study, distilled microprill (i.e., microspherical pellets of test chemical ) was administered by oral gavage at dose levels of 0 (vehicle control), 50, 250, 500, and 1000 mg/kg/day to 8–9 sperm-positive female Sprague–Dawley rats/group/day on gestation days 6–20. No evidence of maternal or fetal toxicity was observed. For the definitive study, four groups of 24–25 timedbred primiparous female rats were administered 0, 50, 500, or 1000 mg /kg/day via gavage on gestation days 6–20. Maternal feed consumption, body weight, body weight gain, uterus weight and corrected body weight/body weight gain were unaffected by treatment. No evidence of maternal toxicity, and no significant differences in litter viability, litter size, or litter body weight were detected. Fetal evaluations failed to show any biologically significant increase in the incidence of anomalies in the treated groups, and no malformations were seen in any of the fetuses. No evidence of fetal mortality, alterations to growth, or structural alterations were observed in the fetuses of dams administered 50–1000 mg/kg/day. Therefore, under the conditions of this study, the no-observed-adverse-effect level (NOAEL) for maternal and developmental toxicity was considered to be 1000 mg/kg/day.When female rats were treated with test chemical orally.

NOAEL for test material was considered to be 1000mg/kg /day for reproductive toxicity, when male and female rats were treated with test material orally. Thus, comparing this value with the criteria of CLP regulation test material is not likely to classify as reproductive toxicant.

Effects on developmental toxicity

Description of key information

Developmental toxicity study

Based on the given study available for the test chemical was reviewed to determine the developmental toxicity, NOAELfor test chemical was considered to be 1000 mg /kg bw/day .When rats were treated with test chemical orally. Thus, comparing this value with the criteria of CLP regulation test chemical is not likely to classify as reproductive and developmental toxicant.

Link to relevant study records

Reference

Endpoint:

developmental toxicity

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Justification for type of information:

Data is from peer-reviewed journal

Qualifier:

according to guideline

Guideline:

OECD Guideline 414 (Prenatal Developmental Toxicity Study)

Principles of method if other than guideline:

The objective of the study was to determine the developmental toxicity potential of test chemical when administered orally to pregnant rats during the period of major organogenesis and histogenesis.

GLP compliance:

not specified

Limit test:

yes

Specific details on test material used for the study:

SOURCE OF TEST MATERIAL
- Source of test material: Cardinal Nutrition, Inc. (Vancouver, WA).
- Expiration date of the lot/batch: No data
- Purity: 99.9%

RADIOLABELLING INFORMATION (Not applicable)
- Radiochemical purity: N/A
- Specific activity: N/A
- Locations of the label: N/A
- Expiration date of radiochemical substance: N/A

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: stored at room temperature.
- Stability under test conditions: the formulations were stable for 32 days for concentrations ranging from 10 to 100 mg/ml when stored at room temperature.
- Solubility and stability of the test substance in the solvent/vehicle: No data
- Reactivity of the test substance with the solvent/vehicle of the cell culture medium: No data

TREATMENT OF TEST MATERIAL PRIOR TO TESTING
- Treatment of test material prior to testing: No data
- Preliminary purification step (if any): No data
- Final dilution of a dissolved solid, stock liquid or gel: No data
- Final preparation of a solid: No data

FORM AS APPLIED IN THE TEST (if different from that of starting material): No data

OTHER SPECIFICS: No data

Species:

rat

Strain:

Sprague-Dawley

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Taconic Farms, Germantown, NY
- Females (if applicable) nulliparous and non-pregnant: [yes]
- Age at study initiation: 7 to 9 weeks
- Weight at study initiation: between 145 and 215 g/rat
- Fasting period before study: No data available
- Housing: Quarantine in plastic cages
- Use of restrainers for preventing ingestion (if dermal): no
- Diet (e.g. ad libitum): Harlan Teklad Certified Rodent Diet #8728C, ad libitum
- Water (e.g. ad libitum): ad libitum
- Acclimation period: Two weeks

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22 ± 4 degC
- Humidity (%): No data available
- Air changes (per hr): No data available
- Photoperiod (hrs dark / hrs light): 12-h light/dark cycle

IN-LIFE DATES: From: To: No data available

Route of administration:

oral: gavage

Type of inhalation exposure (if applicable):

not specified

Vehicle:

water

Details on exposure:

PREPARATION OF DOSING SOLUTIONS: Formulations were prepared in deionized water at 10, 100, and 200 mg/ml concentrations for the 50, 500, and 1000 mg/kg dose levels, respectively.

DIET PREPARATION
- Rate of preparation of diet (frequency): No data
- Mixing appropriate amounts with (Type of food): No data
- Storage temperature of food: No data

VEHICLE
- Justification for use and choice of vehicle (if other than water): No data
- Concentration in vehicle: 50, 500,1000 mg/kg
- Amount of vehicle (if gavage): 5 ml/kg
- Lot/batch no. (if required): No data
- Purity: No data

Analytical verification of doses or concentrations:

yes

Details on analytical verification of doses or concentrations:

Aliquots of the formulations were transferred to dosing vials and samples representing each dose level from the first preparation were analyzed by gas chromatography. The purity of MSM was 99.9%.

Details on mating procedure:

- Impregnation procedure: cohoused
- If cohoused:
- M/F ratio per cage: 1:1 mating scheme (i.e., one male:one female)
- Length of cohabitation: overnight
- Proof of pregnancy: sperm in vaginal smear referred to as day 0 of pregnancy
- After ... days of unsuccessful pairing replacement of first male by another male with proven fertility. No data available
- Further matings after two unsuccessful attempts: no
- Verification of same strain and source of both sexes: no
- Any other deviations from standard protocol: To facilitate the teratogenic evaluation of pups, a staggered-start design (via staggered mating) was employed. Mating was staggered over six days resulting in six series.

Duration of treatment / exposure:

14 days (on gestation days 6–20)
Total exposure period: 20 days.

Frequency of treatment:

Daily

Duration of test:

Terminal killing: 21st day of gestation

Dose / conc.:

0 other: mg/kg

Remarks:

Vehicle group

Dose / conc.:

50 other: mg/kg

Dose / conc.:

500 other: mg/kg

Dose / conc.:

1 000 other: mg/kg

No. of animals per sex per dose:

Total: 98
0 mg/kg/day : 25 timed-bred primiparous dams
50 mg/kg/day : 24 timed-bred primiparous dams
500 mg/kg/day : 25 timed-bred primiparous dams
1000 mg/kg/day : 24 timed-bred primiparous dams

Control animals:

yes

Maternal examinations:

CAGE SIDE OBSERVATIONS: No data
- Time schedule:
- Cage side observations checked in table [No.?] were included.

DETAILED CLINICAL OBSERVATIONS: Yes
- Time schedule:

BODY WEIGHT: Yes
- Time schedule for examinations: Body weights were recorded on gestation days 0 (sperm-positive day/randomization), 3, 6, 9, 12, 15, 18, and 21.

FOOD CONSUMPTION AND COMPOUND INTAKE (if feeding study): Yes
- Feed consumption was calculated for each period between weighings.

WATER CONSUMPTION AND COMPOUND INTAKE (if drinking water study): No data
- Time schedule for examinations:

POST-MORTEM EXAMINATIONS: Yes
- Sacrifice on gestation day 21
- Organs examined: Gross necropsy consisted of examination of the brain and all organs in the thoracic and abdominal cavities of the dams.

Ovaries and uterine content:

The ovaries and uterine content was examined after termination: Yes
Examinations included:
- Gravid uterus weight: Yes
- Number of corpora lutea: Yes
- Number of implantations: Yes
- Number of early resorptions: Yes
- Number of late resorptions: Yes

Fetal examinations:

- External examinations: Yes
- Soft tissue examinations: Yes
- Skeletal examinations: Yes
- Head examinations: Yes

Statistics:

Dam weights, litter body weights, and viability data were analyzed by a two-way analysis of variance (ANOVA). In the presence of a significan t main effect, all post-hoc comparisons were performed using Dunnett’s test (two-tail). Gross, visceral, cephalic, and skeletal data were analyzed by Chi-Square/Fisher’s Exact tests (fetal N) when incidence in the treated rats was higher (i.e., when the difference in the absolute number of fetuses affected is greater than three) than controls. A minimum statistical significance level of p ≤ 0.05 was used in all cases.

Indices:

No data

Historical control data:

No data

Clinical signs:

no effects observed

Description (incidence and severity):

No clinical signs of toxicity were observed.

Dermal irritation (if dermal study):

not examined

Mortality:

not specified

Body weight and weight changes:

no effects observed

Description (incidence and severity):

Body weight was similar among all groups.

Food consumption and compound intake (if feeding study):

no effects observed

Description (incidence and severity):

Feed consumption was not affected.

Food efficiency:

not specified

Water consumption and compound intake (if drinking water study):

not specified

Ophthalmological findings:

not specified

Haematological findings:

not specified

Clinical biochemistry findings:

not specified

Urinalysis findings:

not specified

Behaviour (functional findings):

not specified

Immunological findings:

not specified

Organ weight findings including organ / body weight ratios:

no effects observed

Description (incidence and severity):

Uterine weights were similar across all groups.

Gross pathological findings:

no effects observed

Description (incidence and severity):

No gross external anomalies were observed.

Neuropathological findings:

not specified

Histopathological findings: non-neoplastic:

no effects observed

Description (incidence and severity):

No histopathological lesions in organ and tissues were observed.

Histopathological findings: neoplastic:

not specified

Other effects:

not specified

Details on results:

No evidence of maternal toxicity by test chemical was observed in this study.

Number of abortions:

not specified

Pre- and post-implantation loss:

no effects observed

Total litter losses by resorption:

no effects observed

Early or late resorptions:

no effects observed

Dead fetuses:

no effects observed

Changes in pregnancy duration:

not specified

Changes in number of pregnant:

not specified

Other effects:

not specified

Details on maternal toxic effects:

No evidence of maternal toxicity was observed. No effects observed on maternal body weight, uterus weight, body weight gain. No clinical signs of toxicity were observed.

Dose descriptor:

NOAEL

Effect level:

1 000 mg/kg bw/day

Based on:

test mat.

Basis for effect level:

body weight and weight gain

clinical signs

dead fetuses

early or late resorptions

food consumption and compound intake

gross pathology

histopathology: non-neoplastic

organ weights and organ / body weight ratios

pre and post implantation loss

total litter losses by resorption

Remarks on result:

other: No evidence of maternal toxicity was observed.

Abnormalities:

no effects observed

Fetal body weight changes:

no effects observed

Description (incidence and severity):

No significant differences in male, female or combined fetal weights were detected.

Reduction in number of live offspring:

no effects observed

Changes in sex ratio:

not specified

Changes in litter size and weights:

no effects observed

Changes in postnatal survival:

not specified

External malformations:

no effects observed

Description (incidence and severity):

No gross external anomalies were observed; all fetuses appeared normal and none were malformed.

Skeletal malformations:

no effects observed

Description (incidence and severity):

No treatment-related skeletal anomalies were seen in the low, mid or high dose groups.

Visceral malformations:

no effects observed

Description (incidence and severity):

No visceral malformations were observed in any of the fetuses examined.

Other effects:

no effects observed

Details on embryotoxic / teratogenic effects:

No evidence of embryo or fetal toxicity, or treatment related alterations in fetal body weights or fetal examinations (gross external, visceral, cephalic, or skeletal) was observed in this study upto 1000 mg/kg
No significant differences in litter viability, litter size, or litter body weight were detected.

Dose descriptor:

NOAEL

Effect level:

1 000 mg/kg bw/day (nominal)

Based on:

test mat.

Sex:

female

Basis for effect level:

reduction in number of live offspring

fetal/pup body weight changes

changes in litter size and weights

external malformations

skeletal malformations

visceral malformations

Remarks on result:

other: No evidence of embryo or fetal toxicity was observed.

Abnormalities:

no effects observed

Developmental effects observed:

not specified

Treatment related:

not specified

Conclusions:

Under the conditions of this study, the no-observed-adverse-effect level (NOAEL) for maternal and developmental toxicity was considered to be 1000 mg/kg/day.

Executive summary:

The objective of the study was to determine the developmental toxicity potential of test chemical when administered orally to pregnant rats during the period of major organogenesis and histogenesis. In a preliminary dose-finding study, distilled microprill (i.e., microspherical pellets of test chemical) was administered by oral gavage at dose levels of 0 (vehicle control), 50, 250, 500, and 1000 mg/kg/day to 8–9 sperm-positive female Sprague–Dawley rats/group/day on gestation days 6–20. No evidence of maternal or fetal toxicity was observed. For the definitive developmental study, four groups of 24–25 timed bred primiparous female rats were administered 0, 50, 500, or 1000 mg/kg/day via gavage on gestation days 6–20. Maternal feed consumption, body weight, body weight gain, uterus weight and corrected body weight/body weight gain were unaffected by treatment. No evidence of maternal toxicity, and no significant differences in litter viability, litter size, or litter body weight were detected. Fetal evaluations failed to show any biologically significant increase in the incidence of anomalies in the treated groups, and no malformations were seen in any of the fetuses. No evidence of fetal mortality, alterations to growth, or structural alterations were observed in the fetuses of dams administered 50–1000 mg/kg/day. Therefore, under the conditions of this study, the no-observed-adverse-effect level (NOAEL) for maternal and developmental toxicity was considered to be 1000 mg/kg/day.

Effect on developmental toxicity: via oral route

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

NOAEL

1 000 mg/kg bw/day

Study duration:

subacute

Species:

rat

Quality of whole database:

Data is Klimicsh 2 and from authoritative database

Effect on developmental toxicity: via inhalation route

Endpoint conclusion:

no study available

Effect on developmental toxicity: via dermal route

Endpoint conclusion:

no study available

Additional information

Developmental toxicity study

Data available from given study for test chemicals was reviewed to determine the developmental toxicity of test chemical. The studies are as mentioned below:

The objective of the study was to determine the reproductive toxicity potential of test chemical when administered orally to pregnant rats during the period of major organogenesis and histogenesis. In a preliminary dose-finding study, distilled microprill (i.e., microspherical pellets of test chemical ) was administered by oral gavage at dose levels of 0 (vehicle control), 50, 250, 500, and 1000 mg/kg/day to 8–9 sperm-positive female Sprague–Dawley rats/group/day on gestation days 6–20. No evidence of maternal or fetal toxicity was observed. For the definitive study, four groups of 24–25 timedbred primiparous female rats were administered 0, 50, 500, or 1000 mg /kg/day via gavage on gestation days 6–20. Maternal feed consumption, body weight, body weight gain, uterus weight and corrected body weight/body weight gain were unaffected by treatment. No evidence of maternal toxicity, and no significant differences in litter viability, litter size, or litter body weight were detected. Fetal evaluations failed to show any biologically significant increase in the incidence of anomalies in the treated groups, and no malformations were seen in any of the fetuses. No evidence of fetal mortality, alterations to growth, or structural alterations were observed in the fetuses of dams administered 50–1000 mg/kg/day. Therefore, under the conditions of this study, the no-observed-adverse-effect level (NOAEL) for maternal and developmental toxicity was considered to be 1000 mg/kg/day.When female rats were treated with test chemical orally.

Based on the given study available for the test chemical were reviewed to determine the developmental toxicity, NOAELfor test chemical was considered to be 1000 mg /kg bw/day .When rats were treated with test chemical orally. Thus, comparing this value with the criteria ofCLP regulation testchemical isnot likelyto classify as reproductive and developmental toxicant.

Justification for classification or non-classification

Thus, comparing this value with the criteria ofCLP regulation testchemical isnot likelyto classify as reproductive and developmental toxicant.