1'-acetonaphthone

Endpoint summary

Description of key information

Acute oral toxicity: 

The acute oral toxicity dose (LD50) was considered based on different studies conducted on rats and mice for the test chemical. The LD50 value isbetween 300-2000 mg/kg bw, for acute oral toxicity.Thus, comparing this value with the criteria of CLP regulation, the given test chemical can be classified in “Category 4” for acute oral toxicity. 

Acute Inhalation Toxicity:

The acute inhalation toxicity study need not be conducted because exposure to humans via inhalation route is not likely taking into account due to the low vapour pressure of the test chemical, which is reported to be 5.23E-02 Pa. Thus, exposure to inhalable dust, mist and vapour of the chemical is highly unlikely. Therefore this study is considered for waiver. 

 

Acute Dermal toxicity:

The acute dermal toxicity dose (LD50) was considered based on different studies conducted on rats, rabbits and guinea pigs for the test chemical. The LD50 value is >2000 mg/kg bw, for acute dermal toxicity. Thus, comparing this value with the criteria of CLP regulation, the given test chemical cannot be classified for acute dermal toxicity.

Key value for chemical safety assessment

Acute toxicity: via oral route

Link to relevant study records

Reference

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Justification for type of information:

Data is from experimental study report.

Qualifier:

according to guideline

Guideline:

OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method)

Principles of method if other than guideline:

The purpose of this study was to assess the Toxicological profile of test item to a single administration via oral route to Sprague Dawley rats. This study was designed to determine the acute toxicity at fixed dose levels by oral route of the test item.

GLP compliance:

yes

Test type:

acute toxic class method

Limit test:

no

Species:

rat

Strain:

Sprague-Dawley

Sex:

female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: National Institute of Biosciences, Pune.
- Females nulliparous and non-pregnant: yes
- Age at study initiation: Female rats of the age of approximately 8 to 12 weeks old were used at the commencement of its dosing.
- Weight at study initiation: Body weight range was 192.1 to 204.7 grams.
Body weights at the start : Female Mean: 197.82 g (= 100 %); Minimum : 192.1 g (- 2.89 %); Maximum : 204.7 g (+ 3.48 %)
- Identification: Each female rat was individually identified by the picric acid marking.
- Fasting period before study: Approximately 16 hours or more.
- Housing: The rats were housed in polycarbonate cages.
- Diet (e.g. ad libitum): Rodent feed was provided ad libitum from individual feeders.
- Water (e.g. ad libitum): Water was provided ad libitum from individual bottles attached to the cages. All water was from a local source and passed through the reverse osmosis membrane before use.
- Acclimation period: 5 days.

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 20.0 to 22.0 degree centigrade.
- Humidity (%): 54.4% to 58.9%
- Air changes (per hr): Ten to fifteen air changes per hour.
- Photoperiod (hrs dark / hrs light): An artificial light and dark cycle of 12 hours each was provided to the room.

IN-LIFE DATES: 10-10-2017 to 27-10-2017

Route of administration:

oral: gavage

Vehicle:

corn oil

Details on oral exposure:

VEHICLE
- Concentration in vehicle: 300 mg/kg, 300 mg/kg and 2000 mg/kg.

- Amount of vehicle (if gavage):10 ml/kg body weight

DOSAGE PREPARATION (if unusual): The dose of 300 mg/kg of test item was prepared by dilution of the test item in corn oil to obtain 30 mg/ml strength of solution. The formulation was prepared fresh on the day of dosing. The test item was administered in the dose volume of 10 ml/kg body weight.

Doses:

Dose Group I : 300 mg/kg
Dose Group I : 300 mg/kg
Dose Group II : 2000 mg/kg

No. of animals per sex per dose:

Total No. of animals : 12
Three females were used at each step.

Control animals:

not specified

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: Twice daily
- Necropsy of survivors performed: Yes
- Other examinations performed: Clinical Observations and General Appearance: Animals were observed for clinical signs, mortality and morbidity, until sacrifice.
Onset, duration and severity of any sign were recorded. The clinical signs and mortality observations were conducted at immediately (0 to 5 minutes), 5, 10, 30, 60 minutes, 2, 4 and 6 hours on the day of dosing and once daily thereafter for 14 day. Daily observation was done as far as possible at the same time.
The observations were included general clinical signs, observations of eyes, mucous membranes, respiratory, circulatory system and behavior pattern.

Body weights: Individual animal body weights were recorded, before fasting, prior to administration of the test item (fasting body weights), weekly thereafter and at termination on day 14. Weight changes were calculated and recorded.

Gross Pathology: Necropsy was performed on all animals, found dead and sacrificed at the end of the study. Macroscopic examination of all the orifices, cavities and tissues were made and the findings were recorded. All animals surviving the study period were sacrificed by the carbon dioxide asphyxiation technique (day 15).

Histopathology: No gross abnormalities were observed in animals sacrificed terminally hence, no histopathology was performed.

Statistics:

not specified

Preliminary study:

not specified

Sex:

female

Dose descriptor:

LD50

Effect level:

> 300 - < 2 000 mg/kg bw

Based on:

test mat.

Mortality:

Group I Step I : Animals treated at the dose level of 300 mg/kg body weight: All animals survived through the study period of 14 days.
Group I Step II : Animals treated at the dose level of 300 mg/kg body weight: All animals survived through the study period of 14 days.
Group II Step I : One animal died at 4 hours and two animals died at 6 hours after the dosing to the animals treated at the dose level of 2000 mg/kg body weight:

Clinical signs:

Group I Step I : Animals treated at the dose level of 300 mg/kg body weight did not result in any signs of toxicity during the study period of 14 days.
Group I Step II : Animals treated at the dose level of 300 mg/kg body weight did not result in any signs of toxicity during the study period of 14 days.
Group II Step I : Animals treated at the dose level of 2000 mg/kg body weight resulted in reduced locomotor activity, ataxic gait and tremors with onset at 30 minutes to 4 hours after the dosing.

Body weight:

Group I Step I (300 mg/kg) - Percent body weight gain after 7 days and 14 days was found to be 6.77% and 15.38% respectively.
Group I Step II (300 mg/kg) - Percent body weight gain after 7 days and 14 days was found to be 7.17% and 16.38% respectively.
Group II Step I (2000 mg/kg) - All animals died within 6 hours, hence, body weight gain could not be calculated.

Gross pathology:

Gross pathological examination did not reveal any abnormalities in animals from 300 mg/kg and 2000 mg/kg dose groups.

Other findings:

not specified

Table No. I

Summary of Clinical Signs of Toxicity and Mortality

 

Laboratory Test Item Code :TAS/122/059

Test System : Sprague Dawley Rat

Sex : Female

Group I :   

Step No.	Dose mg/kg	Observed Signs	Total Number of Animals	Animal Nos.	Period of signs in days From - to	Mortality
I	300	No clinical signs observed	3	1,2,3	Day 0 - Day 14	0/3

 

 Group I :

Step No.	Dose mg/kg	Observed Signs	Total Number of Animals	Animal Nos.	Period of signs in days From - to	Mortality
II	300	No clinical signs observed	3	4,5,6	Day 0 - Day 14	0/3

 

Group II :

Step No.	Dose mg/kg	Observed Signs	Total Number of Animals	Animal Nos.	Period of signs in days From - to	Mortality
I	2000	Reduced locomotor activity	3	7,8 9	1 hr. - 4 hrs. 1 hr. - 2 hrs.	3/3
		Ataxic gait	3	7 8 9	1 hrs. - 4 hrs. 30 min. - 4 hrs. 30 min. - 2 hrs.
		Tremors	1	8	4 hrs.

  

Table No.II

Mean Body Weight and Percent Body Weight Gain (g)

 

Laboratory Test Item Code :TAS/122/059

Test System : Sprague Dawley Rat

Sex : Female

Group I :

Step No.	Dose (mg/kg body weight)		Before Fasting Body weight	Body weight Day 7	% body weight gain day 0-7	Body weight Day 14	% body weight gain day 7- 14	% body weight gain day 0- 14
I	300	Mean	199.80	213.33	6.77	230.53	8.07	15.38
		± SD	4.76	5.69	0.43	5.36	0.45	0.08

 

Group I :

Step No.	Dose (mg/kg body weight)		Before Fasting Body weight	Body weight Day 7	% body weight gain day 0-7	Body weight Day 14	% body weight gain day 7- 14	% body weight gain day 0- 14
II	300	Mean	198.93	213.20	7.17	231.53	8.60	16.38
		± SD	2.55	2.86	0.13	3.85	0.38	0.44

 

Group II :

Step No.	Dose (mg/kg body weight)		Before Fasting Body weight	Body weight Day 7	% body weight gain day 0-7	Body weight Day 14	% body weight gain day 7- 14	% body weight gain day 0- 14
I	2000	Mean	194.73	-	-	-	-	-
		± SD	2.31	-	-	-	-	-

  

Table No.III

Summary of Gross Pathological Findings

 

Laboratory Test Item Code :TAS/122/059

Test System : Sprague Dawley Rat

Sex : Female

        Group I :

Step No.	Dose mg/kg	Animal Numbers	Animal Fate	Gross Pathological Findings
I	300	1 - 3	TS	No abnormality detected

  

        Group I :

Step No.	Dose mg/kg	Animal Numbers	Animal Fate	Gross Pathological Findings
II	300	4 - 6	TS	No abnormality detected

  

                    Group II : 

Step No.	Dose mg/kg	Animal Numbers	Animal Fate	Gross Pathological Findings
I	2000	7 - 9	FD	No abnormality detected

 

                     FD = Found dead

                    TS = Terminal Sacrifice 

Interpretation of results:

Category 4 based on GHS criteria

Conclusions:

Under the condition of the study, the acute oral LD50 value of the given test chemical was considered in the range of >300-2000 mg/kg body weight. Thus, it was concluded that the acute toxicity study of test chemical, when administered via oral route in Sprague Dawley rats falls into the “Category 4 (300 ≤ 2000)” criteria of CLP.

Executive summary:

The reported study was designed and conducted to determine the acute oral toxicity profile of the given test chemical as per OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method) in Sprague Dawley rats.

Initially, three female animals were treated at the dose level of 300 mg/kg body weight of the test item (Step - I). Administration of the test item at 300 mg/kg did not result in any signs of toxicity and mortality at 24 hours after the dosing. As no mortality was observed at 24 hours after the dosing, three female animals were added to the study and treated with the same dose of 300 mg/kg of the test item (Step - II). Administration of the test item at 300 mg/kg did not result in any signs of toxicity and mortality after the dosing.

No mortality was observed at 300 mg/kg dose group, hence additional three female animals were treated with the higher dose of 2000 mg/kg of the test item (Step - I). Administration of the test item at 2000 mg/kg resulted in reduced locomotor activity, ataxic gait and tremors with onset at 30 minutes to 4 hours after the dosing. One animal died at 4 hours and two animals died at 6 hours after the dosing. All animals from 300 mg/kg dose group survived and exhibited normal body weight gain through the study period of 14 days. Gross pathological examination did not reveal any abnormalities in animals from 300 mg/kg and 2000 mg/kg dose groups.

Under the condition of the study, the acute oral LD50 value of the given test chemical was considered in the range of >300-2000 mg/kg body weight. Thus, it was concluded that the acute toxicity study of test chemical, when administered via oral route in Sprague Dawley rats falls into the “Category 4 (300 ≤ 2000)” criteria of CLP.

Endpoint conclusion

Endpoint conclusion:

adverse effect observed

Dose descriptor:

LD50

Value:

1 000 mg/kg bw

Quality of whole database:

Data is Klimisch 1 and from study report.

Acute toxicity: via inhalation route

Link to relevant study records

Reference

Endpoint:

acute toxicity: inhalation

Data waiving:

other justification

Justification for data waiving:

other:

Endpoint conclusion

Quality of whole database:

Waiver

Acute toxicity: via dermal route

Link to relevant study records

Reference

Endpoint:

acute toxicity: dermal

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Justification for type of information:

Data is from experimental study report.

Qualifier:

according to guideline

Guideline:

OECD Guideline 402 (Acute Dermal Toxicity)

Principles of method if other than guideline:

This study was designed to determine the dermal LD50 of the test item (up to 2000 mg/kg) or to establish a non-lethal dose level of 2000 milligram of test item per kilogram of body weight.

GLP compliance:

yes

Test type:

other: Acute Dermal Toxicity

Limit test:

yes

Species:

rat

Strain:

Sprague-Dawley

Sex:

female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: National Institute of Biosciences, Pune.
- Females (if applicable) nulliparous and non-pregnant: yes
- Age at study initiation: Young adult (8 to 10 weeks old) female rats were used.
- Weight at study initiation: The weight range of approximately 213.2 to 233.6 grams at initiation of dosing.
Body weights at the start : Female - Mean: 228.18 g (= 100 %); Minimum : 213.2 g (- 6.56 %); Maximum : 233.6 g (+ 2.38 %)
- Identification: Each rat was individually identified by the cage number.
- Housing: The rats were individually housed in polycarbonate cages with paddy husk as bedding.
- Diet (e.g. ad libitum): Rodent feed was provided ad libitum from individual feeders.
- Water (e.g. ad libitum): Water was provided ad libitum from individual bottles attached to the cages. All water was from a local source and passed through the reverse osmosis membrane before use.
- Acclimation period: 5 days.

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 19.2 to 21.8 degree centigrade.
- Humidity (%): 56.0% to 59.1%.
- Air changes (per hr): Ten to fifteen air changes per hour.
- Photoperiod (hrs dark / hrs light): An artificial light and dark cycle of 12 hours each was provided to the room.

IN-LIFE DATES: 31-10-2017 to 24-11-2017

Type of coverage:

occlusive

Vehicle:

unchanged (no vehicle)

Details on dermal exposure:

TEST SITE
- Area of exposure: the trunk (dorsal surface and sides from scapular to pelvic area)
- % coverage: approximately 10% of the total body surface area
- Type of wrap if used: The test item was held in contact with the skin using a porous gauze dressing and non irritating tape around the animal to cover the exposure site. Elizabethan collar was placed on each animal for first 24 hours after application of the test item. These collars prevent ingestion of test item.

REMOVAL OF TEST SUBSTANCE
- Washing (if done): The wrapping was removed and the test site wiped free of excess test item. Distilled water was used to remove residual test item.
- Time after start of exposure: 24 hours

Duration of exposure:

24 hours

Doses:

Dose Range Finding Study:
Group I : 200 mg/kg
Group I : 1000 mg/kg
Group I : 2000 mg/kg
Main Study: Group II : 2000 mg/kg

No. of animals per sex per dose:

Dose Range Finding Study:
Group I : 200 mg/kg - 1
Group I : 1000 mg/kg - 1
Group I : 2000 mg/kg - 1
Main Study: Group II : 2000 mg/kg - 2

Control animals:

not specified

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: Twice daily
- Necropsy of survivors performed: yes, necropsy was performed on animals surviving at the end of the study. Macroscopic examination of all the orifices, cavities and tissues were made and the findings were recorded. All animals surviving the study period were sacrificed by the carbon dioxide asphyxiation technique (day 15).
- Other examinations performed: Clinical Observations and General Appearance: Animals were observed for clinical signs, mortality, until sacrifice.
Onset, duration and severity of any sign were recorded. The clinical signs and mortality observations were conducted at 10, 30, 60 minutes, 2, 4 and 6 hours on the day of dosing and once daily thereafter for 14 day. Daily observation was done as far as possible at the same time.
The observations included general clinical signs, observations of eyes, mucous membranes, respiratory, circulatory system and behavior pattern.
Evaluation of Dermal Reaction:
Dermal reaction was observed daily for study period of 14 days.
Body weights:
Individual animal body weights were recorded pre-test (prior to administration of the test item), day 7 and at termination on day 14.
Histopathology:
No gross abnormalities were observed in animals sacrificed terminally hence, no histopathology was performed.

Statistics:

not specified

Preliminary study:

Dose Finding Study: A single dose of 200 mg/kg body weight of the test item was administered to 1 female animal. No death or clinical signs of toxicity was observed during first 48 hours, hence, additional 1 female animal was administered at the dose of 1000 mg/kg body weight. Administration of 1000 mg/kg body weight did not reveal any clinical signs of toxicity or death during first 48 hours, hence, additional 1 female animal was administered at the dose of 2000 mg/kg body weight. Administration of 2000 mg/kg body weight did not reveal any clinical signs of toxicity or death during first 48 hours.

Sex:

female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Remarks on result:

other: No mortality was observed

Mortality:

Dose Range Finding Study: All animals survived through the study period of 14 days at 200 mg/kg, 1000 mg/kg and 2000 mg/kg body weight .
Main Study: Group II : All animals survived through the study period of 14 days.

Clinical signs:

Dose Range Finding Study: Animals treated at the dose level of 200 mg/kg, 1000 mg/kg and 2000 mg/kg body weight did not result in any signs of toxicity during the study period of 14 days.
Main Study: Group II : Animals treated at the dose level of 2000 mg/kg body weight did not result in any signs of toxicity during the study period of 14 days.

Body weight:

Dose Range Finding Study: Group I (200 mg/kg) - Percent body weight gain after 7 days and 14 days was found to be 7.45% and 11.33% respectively.
Group I (1000 mg/kg) - Percent body weight gain after 7 days and 14 days was found to be 6.71% and 12.38% respectively.
Group I (2000 mg/kg) - Percent body weight gain after 7 days and 14 days was found to be 5.44% and 11.04% respectively.
Main Study: Group II (2000 mg/kg) - Percent body weight gain after 7 days and 14 days was found to be 5.27% and 12.54% respectively.

Gross pathology:

Gross pathological examination did not reveal any abnormalities in animals from 200 mg/kg, 1000 mg/kg and 2000 mg/kg dose groups from dose range finding study and main study sacrificed terminally.

Other findings:

Dose Range Finding Study: Group I : Animal treated at the dose level of 200 mg/kg body weight did not result in any skin reaction during the study period of 14 days.
Group I : Animal treated at the dose level of 1000 mg/kg body weight did not result in any skin reaction during the study period of 14 days.
Group I : Animal treated at the dose level of 2000 mg/kg body weight did not result in any skin reaction during the study period of 14 days.
Main Study: Group II : Animals treated at the dose level of 2000 mg/kg body weight did not result in any skin reaction during the study period of 14 days.

Table No. I

Summary of Clinical Signs of Toxicity and Mortality

 

Laboratory Test Item Code :TAS/122/059

Test System : Sprague Dawley Rat

Sex : Female

Dose Finding Study:

Group  No.	Dose mg/kg	Observed Signs	Total Number of Animals	Animal Nos.	Period of signs in days  From - to	Mortality
I	200	No clinical signs observed	1	1	Day 0 - Day 14	0/1

 

Group  No.	Dose mg/kg	Observed Signs	Total Number of Animals	Animal Nos.	Period of signs in days  From - to	Mortality
I	1000	No clinical signs observed	1	2	Day 0 - Day 14	0/1

 

Group  No.	Dose mg/kg	Observed Signs	Total Number of Animals	Animal Nos.	Period of signs in days  From - to	Mortality
I	2000	No clinical signs observed	1	3	Day 0 - Day 14	0/1

 

Main Study:

Group  No.	Dose mg/kg	Observed Signs	Total Number of Animals	Animal Nos.	Period of signs in days  From - to	Mortality
II	2000	No clinical signs observed	2	4, 5	Day 0 - Day 14	0/2

Table No. II 

Summary of Evaluation of Dermal Reaction

 

Laboratory Test Item Code :TAS/122/059

Test System : Sprague Dawley Rat

Sex : Female

Dose Finding Study:

Group  No.	Dose mg/kg	Dermal Reaction	Total Number of Animals	Animal Nos.	Period of signs in days  From - to
I	200	No dermal reaction observed	1	1	Day 0 - Day 14

 

Group  No.	Dose mg/kg	Dermal Reaction	Total Number of Animals	Animal Nos.	Period of signs in days  From - to
I	1000	No dermal reaction observed	1	2	Day 0 - Day 14

 

Group  No.	Dose mg/kg	Dermal Reaction	Total Number of Animals	Animal Nos.	Period of signs in days  From - to
I	2000	No dermal reaction observed	1	3	Day 0 - Day 14

 

Main Study:

Group  No.	Dose mg/kg	Dermal Reaction	Total Number of Animals	Animal Nos.	Period of signs in days  From - to
II	2000	No dermal reaction observed	2	4, 5	Day 0 - Day 14

 

Table No.III

Mean Body Weight and Percent Body Weight Gain (g)

 

Laboratory Test Item Code :TAS/122/059

Test System : Sprague Dawley Rat

Sex : Female

Dose Finding Study:

Group No.	Dose (mg/kg body weight)		Body weight Day 0	Body weight Day 7	% body weight gain day 0-7	Body weight Day 14	% body weight gain day 7- 14	% body weight gain day 0- 14
I	200	Mean	229.4	246.5	7.45	255.4	3.61	11.33
		± SD	-	-	-	-	-	-

 

Group No.	Dose (mg/kg body weight)		Body weight Day 0	Body weight Day 7	% body weight gain day 0-7	Body weight Day 14	% body weight gain day 7- 14	% body weight gain day 0- 14
I	1000	Mean	213.2	227.5	6.71	239.6	5.32	12.38
		± SD	-	-	-	-	-	-

 

Group No.	Dose (mg/kg body weight)		Body weight Day 0	Body weight Day 7	% body weight gain day 0-7	Body weight Day 14	% body weight gain day 7- 14	% body weight gain day 0- 14
I	2000	Mean	233.6	246.3	5.44	259.4	5.32	11.04
		± SD	-	-	-	-	-	-

 

Main Study:

Group No.	Dose (mg/kg body weight)		Body weight Day 0	Body weight Day 7	% body weight gain day 0-7	Body weight Day 14	% body weight gain day 7- 14	% body weight gain day 0- 14
II	2000	Mean	232.35	244.60	5.27	261.50	6.90	12.54
		± SD	0.64	0.85	0.08	8.20	2.98	3.22

Table No.IV

Summary of Gross Pathological Findings

 

Laboratory Test Item Code :TAS/122/059

Test System : Sprague Dawley Rat

Sex : Female

Dose Finding Study:

Group No.	Dose mg/kg	Animal Numbers	Animal Fate	Gross Pathological Findings
I	200	1	TS	No abnormality detected

 

Group No.	Dose mg/kg	Animal Numbers	Animal Fate	Gross Pathological Findings
I	1000	2	TS	No abnormality detected

 

Group No.	Dose mg/kg	Animal Numbers	Animal Fate	Gross Pathological Findings
I	2000	3	TS	No abnormality detected

 

                    Main Study:

Group No.	Dose mg/kg	Animal Numbers	Animal Fate	Gross Pathological Findings
II	2000	4, 5	TS	No abnormality detected

 

                     TS = Terminal Sacrifice

Interpretation of results:

other: Not classified

Conclusions:

It was concluded that the acute dermal median lethal dose (LD50) of the given test chemical, when administered to female Sprague Dawley rats was considered to be >2000 mg/kg body weight. Thus, according to CLP criteria for acute toxicity rating for the chemicals, it infers that the given test chemical does not classify as an acute dermal toxicant. CLP Classification: “Not classified”.

Executive summary:

The reported study was designed and conducted to determine the acute dermal toxicity profile of the given test chemical as per OECD Guideline 402 (Acute Dermal Toxicity) in Sprague Dawley rats.

In the dose range finding study a single dose of 200 mg/kg body weight of the test item was administered to 1 female animal. No death or clinical signs of toxicity was observed during first 48 hours, hence, additional 1 female animal was administered with the dose of 1000 mg/kg body weight. Administration of 1000 mg/kg body weight did not reveal any clinical signs of toxicity or death during first 48 hours, hence, additional 1 female animal was administered at the dose of 2000 mg/kg body weight. Administration of 2000 mg/kg body weight did not reveal any clinical signs of toxicity or death during first 48 hours.

As the dose range finding study revealed no mortality or clinical signs at the maximum dose of 2000 mg/kg, the main study was initiated with two additional animals. The animals were administered with a dose of 2000 mg/kg body weight in sequential manner at 48 hours intervals.

Animals from dose range finding study treated at the dose levels of 200 mg/kg, 1000 mg/kg and 2000 mg/kg and animals from main study treated at the dose level of 2000 mg/kg exhibited normal body weight gain and revealed no clinical signs of toxicity or mortality during the study period of 14 days. Gross pathological examination did not reveal any abnormalities attributable to the treatment.

It was concluded that the acute dermal median lethal dose (LD50) of the given test chemical, when administered to female Sprague Dawley rats was considered to be >2000 mg/kg body weight. Thus, according to CLP criteria for acute toxicity rating for the chemicals, it infers that the given test chemical does not classify as an acute dermal toxicant. CLP Classification: “Not classified”.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed

Dose descriptor:

LD50

Value:

2 000 mg/kg bw

Quality of whole database:

Data is Klimisch 1 and from study report.

Additional information

Acute oral toxicity:

In different studies, the given test chemical has been investigated for acute oral toxicity to a greater or lesser extent. Often are the studies based on in-vivo experiments in rodents, i.e. most commonly in rats and mice for test chemical. The studies are summarized as below:

 

The reported key study was designed and conducted to determine the acute oral toxicity profile of the given test chemical as per OECD Guideline 423 (Acute Oral toxicity - Acute Toxic Class Method) in Sprague Dawley rats.

Initially, three female animals were treated at the dose level of 300 mg/kg body weight of the test item (Step - I). Administration of the test item at 300 mg/kg did not result in any signs of toxicity and mortality at 24 hours after the dosing. As no mortality was observed at 24 hours after the dosing, three female animals were added to the study and treated with the same dose of 300 mg/kg of the test item (Step - II). Administration of the test item at 300 mg/kg did not result in any signs of toxicity and mortality after the dosing.

No mortality was observed at 300 mg/kg dose group, hence additional three female animals were treated with the higher dose of 2000 mg/kg of the test item (Step - I). Administration of the test item at 2000 mg/kg resulted in reduced locomotor activity, ataxic gait and tremors with onset at 30 minutes to 4 hours after the dosing. One animal died at 4 hours and two animals died at 6 hours after the dosing. All animals from 300 mg/kg dose group survived and exhibited normal body weight gain through the study period of 14 days. Gross pathological examination did not reveal any abnormalities in animals from 300 mg/kg and 2000 mg/kg dose groups.

Under the condition of the study, the acute oral LD50 value of the given test chemical was considered in the range of >300-2000 mg/kg body weight. Thus, it was concluded that the acute toxicity study of test chemical, when administered via oral route in Sprague Dawley rats falls into the “Category 4 (300 ≤ 2000)” criteria of CLP.

 

The above study is supported with another study mentioned in publication, authoritative database, various handbooks and secondary report for the test chemical. The acute oral toxicity study of the given test chemical was conducted in rats at the dose concentration range of 1140-2090 mg/kg bw. Animals were observed for mortality. 50% mortality was observed at 1560 mg/kg bw. Therefore, LD50 value was considered to be 1560 mg/kg bw, with 95% confidence limits of 1140-2090 mg/kg bw, when rats were treated with the given test chemical via oral route.

 

These studies are supported with the study mentioned in secondary report for the test chemical. The acute oral toxicity study of the given test chemical was conducted in male rats at the dose concentration range of 540-1184 mg/kg bw. Animals were observed for mortality. 50% mortality was observed in treated animals at 800 mg/kg bw. Therefore, the LD50 value was considered to be 800 mg/kg bw, with 95% confidence limit of 540-1184 mg/kg bw, when male rats were treated with the given test chemical via oral route.

 

All the above studies are supported with the study conducted in mice and mentioned in secondary report for the test chemical. The acute oral toxicity study of the given test chemical was conducted in male mice at the dose concentration range of 540-1184 mg/kg bw. Animals were observed for mortality and clinical signs. 50% mortality was observed in treated animals at 800 mg/kg bw. Therefore, the LD50 value was considered to be 800 mg/kg bw, with 95% confidence limit of 540-1184 mg/kg bw, when male mice were treated with the given test chemical via oral route.

 

Thus, based on the above summarised experimental studies on test chemical, from key study, all rats were died at 2000 mg/kg bw, hence the LD100 was considered to be 2000 mg/kg bw. Considering this value, the LD50 value can be expected to be 1000 mg/kg bw. Also, other supporting studies are showing the value in the range between 300-2000 mg/kg bw. Therefore, comparing this value and range with the criteria of CLP regulation, the given test chemical can be classified in “Category 4 (300 – ≤ 2000)” for acute oral toxicity.

 

Acute Inhalation Toxicity:

The acute inhalation toxicity study need not be conducted because exposure to humans via inhalation route is not likely taking into account due to the low vapour pressure of the test chemical, which is reported to be 5.23E-02 Pa. Thus, exposure to inhalable dust, mist and vapour of the chemical is highly unlikely. Therefore this study is considered for waiver. 

Acute Dermal Toxicity:

In different studies, the given test chemical has been investigated for acute dermal toxicity to a greater or lesser extent. Often are the studies based on in-vivo experiments in rodents, i.e. most commonly in rats, rabbits and guinea pigs for test chemical. The studies are summarized as below -

 

The reported key study was designed and conducted to determine the acute dermal toxicity profile of the given test chemical as per OECD Guideline 402 (Acute Dermal Toxicity) in Sprague Dawley rats.

In the dose range finding study a single dose of 200 mg/kg body weight of the test item was administered to 1 female animal. No death or clinical signs of toxicity was observed during first 48 hours, hence, additional 1 female animal was administered with the dose of 1000 mg/kg body weight. Administration of 1000 mg/kg body weight did not reveal any clinical signs of toxicity or death during first 48 hours, hence, additional 1 female animal was administered at the dose of 2000 mg/kg body weight. Administration of 2000 mg/kg body weight did not reveal any clinical signs of toxicity or death during first 48 hours.

As the dose range finding study revealed no mortality or clinical signs at the maximum dose of 2000 mg/kg, the main study was initiated with two additional animals. The animals were administered with a dose of 2000 mg/kg body weight in sequential manner at 48 hours intervals.

Animals from dose range finding study treated at the dose levels of 200 mg/kg, 1000 mg/kg and 2000 mg/kg and animals from main study treated at the dose level of 2000 mg/kg exhibited normal body weight gain and revealed no clinical signs of toxicity or mortality during the study period of 14 days. Gross pathological examination did not reveal any abnormalities attributable to the treatment.

It was concluded that the acute dermal median lethal dose (LD50) of the given test chemical, when administered to female Sprague Dawley rats was considered to be >2000 mg/kg body weight. Thus, according to CLP criteria for acute toxicity rating for the chemicals, it infers that the given test chemical does not classify as an acute dermal toxicant. CLP Classification: “Not classified”.

 

The above study is supported with another study mentioned in peer-reviewed journal and database for the test chemical. The acute dermal toxicity study of the given test chemical was conducted in rabbits at the dose concentration of 5000 mg/kg bw. Animals were observed for mortality. No mortality was observed at 5000 mg/kg bw. Therefore, LD50 value was considered to be >5000 mg/kg bw, when rabbits were treated with the given test chemical by dermal application.

 

Both the above studies are further supported with the study conducted on guinea pigs and mentioned in report for the test chemical. The acute dermal toxicity study of the given test chemical was conducted in guinea pigs at the dose concentration of 20000 mg/kg bw. Animals were observed for mortality. No mortality was observed in treated animals at 20000 mg/kg bw. Therefore, the LD50 value was considered to be >20000 mg/kg bw, when guinea pigs were treated with the given test chemical by dermal application occlusively.

 

Thus, based on the above summarised studies on test chemical, it can be concluded that LD50 value is >2000 mg/kg bw. Thus, comparing this value with the criteria of CLP regulation, the given test chemical cannot be classified for acute dermal toxicity.

 

Justification for classification or non-classification

Based on the above studies on test chemical, it can be concluded that LD50 value is between 300-2000 mg/kg bw, for acute oral toxicity and LD50 value is >2000 mg/kg bw, for acute dermal toxicity. Thus, comparing these range and value with the criteria of CLP regulation, the given test chemical can be classified in “Category 4” for acute oral toxicity and cannot be classified for acute dermal toxicity. For acute inhalation toxicity wavier was added so, not possible to classify.