Methyl phenylacetate

Acute Toxicity: dermal

Administrative data

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 study report.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2014

Report date:

2014

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 402 (Acute Dermal Toxicity)

Principles of method if other than guideline:

The objective of the study was to assess the dermal toxicity of the given test chemical after single dose application by dermal route in rats.

GLP compliance:

yes

Test type:

standard acute method

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Methyl phenylacetate

EC Number:

202-940-9

EC Name:

Methyl phenylacetate

Cas Number:

101-41-7

Molecular formula:

C9H10O2

IUPAC Name:

methyl phenylacetate

Details on test material:

- Name of test material (as cited in study report): Methyl phenylacetate
- Molecular formula : C9H10O2
- Molecular weight : 150.177
- Substance type: Organic
- Physical state: Liquid
- Lot/batch No.: 2012051201
- Analytical purity: 99.42 %
- Storage condition of test material: Room temperature (20° - 30 °C)
- Other:
Handling and Disposal
Safety precautions : Aprons, masks, caps, gloves and goggles were used to ensure the health and safety of the Personnel
Disposal : The remaining unused test item was disposed as per internal SOPs of sa-FORD and the same was documented in the raw data.

Test animals

Species:

rat

Strain:

Wistar

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source:In-House Bred at Sa-Ford, Animal Facility.
- Females (if applicable) nulliparous and non-pregnant: yes
- Age at study initiation: Healthy young adult animals were used for the study.
- Weight (Prior to Treatment):Male:Minimum: 256 g and Maximum: 290 g ,Female:Minimum: 232 g and Maximum: 256 g
- Housing: The animals were housed individually in polycarbonate cages.
- Bedding : All cages were provided with corn cobs (Sparconn Life Sciences Bangalore) Batch No.: SPAR – 26/2014 and SPAR – 27/2014
- Room Sanitation : The experimental room floor and work tops were swept and mopped with disinfectant solution every day.
- Cages and water bottle : All the cages and water bottles were changed at least twice every week.
- Diet (e.g. ad libitum):All animals were provided conventional laboratory rodent diet (Nutrivet Life Sciences, Pune) ad libitum. Batch No 400010.
- Water (e.g. ad libitum):Aqua guard filtered tap water was provided ad libitum via drinking bottles.
- Acclimation period: All animals were acclimatized to the test conditions for 7 days prior to administration of the test item.
- Randomization : Animals were selected manually. No computer generated randomization program was used.

ENVIRONMENTAL CONDITIONS
- Temperature (°C):Minimum: 19.70 °C and Maximum: 21.40 °C
- Humidity (%):Minimum: 47.40% and Maximum: 58.60%
- Air changes (per hr):More than 12 changes per hour
- Photoperiod (hrs dark / hrs light):12:12

Administration / exposure

Type of coverage:

occlusive

Vehicle:

other: distilled water

Details on dermal exposure:

TEST SITE
- Area of exposure:The test item was applied uniformly over clipped dorsal area of rat skin.
- % coverage:Approximately 10% body surface area of rat.
- Type of wrap if used: The porous gauze dressing and non-irritating tape.

REMOVAL OF TEST SUBSTANCE
- Washing (if done):The residual test item was removed by using distilled water.
- Time after start of exposure:24-hour.

TEST MATERIAL
- Amount(s) applied (volume or weight with unit):A limit dose of 2000 mg/ kg body weight of test item was applied.
- Constant volume or concentration used: yes

Duration of exposure:

24 hrs

Doses:

2000 mg/kg body weight.

No. of animals per sex per dose:

10 (Five per sex)

Control animals:

not specified

Details on study design:

- Duration of observation period following administration: 14 days
- Frequency of observations and weighing: Clinical Observation - After test item administration, individual animals were frequently observed at 1, 2, 3 and 4 hours post dosing on day 0 (day of dosing). Subsequently, all animals were observed once a day during the 14 day observation period.
Mortality - Animals were observed twice daily for any mortality during the experimental period.
Body weight - All rats were weighed on days 0 (prior to dosing), 7 and 14.
Local Signs/Skin Reactions - All animals were observed once daily during days 1-14 (in common with clinical signs).
- Necropsy of survivors performed: At the end of 14 day observation period, all the surviving rats were euthanised by overdose of CO2 and subjected to gross pathology examination, for external and internal observations.

Statistics:

No statistical analysis was performed since the study was terminated with limit test.

Results and discussion

Preliminary study:

not specified

Effect levels

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Remarks on result:

other: no mortality was observed

Mortality:

No mortality was observed at limit dose of 2000 mg/kg body weight during the 14 day observation period

Clinical signs:

other: At 2000 mg/kg, all the animals were observed normal throughout the experimental period

Gross pathology:

The external and internal gross pathological observation of all terminally sacrificed animals did not show any pathological abnormality

Other findings:

not specified

Any other information on results incl. tables

Table 1: Individual Animal Body Weight (g) andBody Weight Changes(%)

 

Dose:2000 mg/ kg bodyweight                                                                            Density:1.05513

Animal No.	Sex	Dose Volume* (ml)	Body Weight (gram)			Body Weight Change (%)
			Day 0	Day 7	Day 14	Day 0-7	Day 0-14
1	Male	0.55	290	298	305	2.76	5.17
2		0.52	275	286	310	4.00	12.73
3		0.50	265	273	294	3.02	10.94
4		0.49	257	268	283	4.28	10.12
5		0.49	256	261	265	1.95	3.52
6	Female	0.46	242	245	249	1.24	2.89
7		0.45	235	237	239	0.85	1.70
8		0.44	232	236	239	1.72	3.02
9		0.46	244	246	247	0.82	1.23
10		0.49	256	257	261	0.39	1.95

Keys: * = based on the test item density and day 0 body weight

Table 2: Individual Animal Clinical Signs and Symptoms

 

Dose:2000 mg/kg body weight

Animal No.	Sex	Hour(s) - Day 0				Day
		1	2	3	4	1	2	3	4	5	6	7
1	Male	1	1	1	1	1	1	1	1	1	1	1
2		1	1	1	1	1	1	1	1	1	1	1
3		1	1	1	1	1	1	1	1	1	1	1
4		1	1	1	1	1	1	1	1	1	1	1
5		1	1	1	1	1	1	1	1	1	1	1
6	Female	1	1	1	1	1	1	1	1	1	1	1
7		1	1	1	1	1	1	1	1	1	1	1
8		1	1	1	1	1	1	1	1	1	1	1
9		1	1	1	1	1	1	1	1	1	1	1
10		1	1	1	1	1	1	1	1	1	1	1

 

Animal No.	Sex	Day
		8	9	10	11	12	13	14
1	Male	1	1	1	1	1	1	1
2		1	1	1	1	1	1	1
3		1	1	1	1	1	1	1
4		1	1	1	1	1	1	1
5		1	1	1	1	1	1	1
6	Female	1	1	1	1	1	1	1
7		1	1	1	1	1	1	1
8		1	1	1	1	1	1	1
9		1	1	1	1	1	1	1
10		1	1	1	1	1	1	1

Key: 1 = Normal

Table 3: Individual Animal Mortality Record

 

Dose:2000 mg/kg body weight

Animal No.	Sex	Days of Observation (0 to 14)
		Morning Observations	Evening Observations
1	Male	No mortality and morbidity	No mortality and morbidity
2		No mortality and morbidity	No mortality and morbidity
3		No mortality and morbidity	No mortality and morbidity
4		No mortality and morbidity	No mortality and morbidity
5		No mortality and morbidity	No mortality and morbidity
6	Female	No mortality and morbidity	No mortality and morbidity
7		No mortality and morbidity	No mortality and morbidity
8		No mortality and morbidity	No mortality and morbidity
9		No mortality and morbidity	No mortality and morbidity
10		No mortality and morbidity	No mortality and morbidity

Applicant's summary and conclusion

Interpretation of results:

other: Not classified

Conclusions:

The LD50 value was considered to be >2000 mg/kg bw, when male and female wistar rats were occlusively treated with test chemical by dermal application following 14 days of observation period according to OECD Guideline 402 (Acute Dermal Toxicity).

Executive summary:

Acute dermal toxicity study was conducted by using the given test chemical as per OECD No. 402 in Wistar rats.

Five male and five female healthy young adult rats were randomly selected and used for conducting acute dermal toxicity study. Rats free from injury and irritation of skin were selected for the study. Approximately, twenty four hours prior to dermal application of test item, greater than 10% of body surface area of each rat was clipped. A limit dose of 2000 mg/ kg body weight based on the test item density (1.05513) and latest body weight was applied by single dermal application and observed for 14 days after treatment.

On test day 0, calculated volume of test item was applied directly on the intact skin of clipped area of rats; the porous gauze dressing was put on to the intact skin of clipped area. This porous gauze dressing was covered with a non-irritating tape. After the 24-hour application period, the dressings were removed and the skin was gently wiped with distilled water. The skin reactions were assessed.

The animals were observed daily for mortality and clinical signs, during the acclimatization period and post dosing till the termination. All animals were observed for clinical signs at approximately 1, 2, 3 and 4 hours after treatment on day 0 and once daily during test days 1‑14. Mortality was recorded after application on test day 0 and twice daily during days 1-14 (at least once on the day of sacrifice). Local signs / Skin reactions were observed daily from test days 1-14 (in common with clinical signs). Body weights were re­corded on day 0 (prior to application) and on day 7 and 14. All animals were necropsied and examined macroscopically.

No mortality was observed in any animal till the end of the experimental period. At 2000 mg/kg, all the animals were observed normal throughout the experimental period. Mean body weight was observed with gain on day 7 and 14 of male and female animals, as compared to day 0. The external and internal gross pathological observation of all terminally sacrificed animals did not show any pathological abnormality.

Hence, the LD50 value was considered to be >2000 mg/kg bw, when male and female wistar rats were occlusively treated with test chemical by dermal application following 14 days of observation period according to OECD Guideline 402 (Acute Dermal Toxicity).