(2,6-xylyloxy) acetic acid

Acute Toxicity: dermal

Administrative data

Endpoint:

acute toxicity: dermal

Type of information:

experimental study

Adequacy of study:

key study

Study period:

25 March 1999 - 09 April 1999

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: done under GLP and OECD method

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1996

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

EU Method B.3 (Acute Toxicity (Dermal))

GLP compliance:

yes

Test type:

standard acute method

Test material

Test material information

Constituent 1

Reference substance name:

-

EC Number:

430-910-7

EC Name:

-

Cas Number:

13335-71-2

Molecular formula:

Hill formula: C10H12O3 CAS formula: C10H12O3

IUPAC Name:

2-(2,6-dimethylphenoxy)acetic acid

Details on test material:

Abbott-172245

Test animals

Species:

rat

Strain:

other: Hsd:Sprague Dawley®SD®

Sex:

male/female

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Harlan Sprague Dawley Inc, Inianapolis, Indiana
- Age at study initiation: 7 - 9 weeks
- Weight at study initiation: 190 to 220g
- Housing: Individual stainless steel hanging cages
- Diet :Certified Rodent Chow, ad libitum
- Water: ad libitum
- Acclimation period: min 8 days

ENVIRONMENTAL CONDITIONS
- Temperature (°F): 66° to 71°
- Photoperiod (hrs dark / hrs light): 12hrs/12hrs

Administration / exposure

Type of coverage:

semiocclusive

Vehicle:

water

Remarks:

sufficient sterile water for injection to make a thick paste.

Details on dermal exposure:

TEST SITE
- Area of exposure: approx 10% of total body area

REMOVAL OF TEST SUBSTANCE
- Washing (if done): The semi-occlusive dressing and gauze were removed and the treated area of the skin was rinsed with warm water to remove any residual test material. The treated area was blotted dry with absorbent paper.
- Time after start of exposure: 24hr

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 2g/kg BW


VEHICLE
- Amount(s) applied (volume or weight with unit): Sufficient sterile water for injection to make a thick paste.

Duration of exposure:

24 hr

Doses:

2g/kgbw

No. of animals per sex per dose:

5

Control animals:

no

Details on study design:

All rats observed frequently on day of treatment and daily for 13 days for total of 14 days. The daily observations included signs of toxicity in addition to lethality and irritation at the exposure site.
All animals weighed prior to dosing and weekly thereafter.

Necropsy of survivors performed: yes, 2 weeks after treatment.

Results and discussion

Effect levels

Effect levels 1

Sex:

female

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Effect levels 2

Sex:

male

Dose descriptor:

LD50

Effect level:

> 2 000 mg/kg bw

Based on:

test mat.

Mortality:

Male: 2,000 mg/kg bw; Number of animals: 5; Number of deaths: 0
Female: 2,000 mg/kg bw; Number of animals: 5; Number of deaths: 0

Clinical signs:

Abrasion on the back on several days and rough coat on a single day in one female was observed.
Red discharge from the nosse on 2 days and rough coat on a single day in a second female rat was also observed

Body weight:

No apparent treatment related effects on body weight were observed.

Gross pathology:

No gross morphological changes were observed in rats that were euthanized and necropsied at the end of the two week observation period.

Applicant's summary and conclusion

Conclusions:

The acute dermal median lethal dose (LD50) of Abbott-172245 in rats was demonstrated to be greater than the limit dose, 2000 mg/kg bodyweight