Phosphoric acid, hexadecyl esters, potassium salts with cetyl alcohol and isostearyl isostearate

Acute Toxicity: oral

Administrative data

Endpoint:

acute toxicity: oral

Type of information:

experimental study

Adequacy of study:

weight of evidence

Study period:

From August 30, 1985 to September 13, 1985

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

comparable to guideline study with acceptable restrictions

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1985

Report date:

1985

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

other: notification No. 118 of the Pharmaceuticals Affairs Bureau, 15 Feb 1984, Toxicity Test Guideline

Deviations:

no

Test guideline 2

Qualifier:

equivalent or similar to guideline

Guideline:

OECD Guideline 401 (Acute Oral Toxicity)

GLP compliance:

not specified

Test type:

fixed dose procedure

Limit test:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Dihexadecyl hydrogen phosphate

EC Number:

218-594-7

EC Name:

Dihexadecyl hydrogen phosphate

Cas Number:

2197-63-9

Molecular formula:

C32H67O4P

IUPAC Name:

bis(hexadecyloxy)phosphinic acid

Test material form:

solid: flakes

Details on test material:

- Test material: Dihexadecyl phosphate

Test animals

Species:

rat

Strain:

other: CFY (Sprague-Dawley origin)

Sex:

male/female

Details on test animals or test system and environmental conditions:

Test animals
- Source: Interfauna UK Limited, Huntingdon, Cambridgeshire, England
- Age at study initiation: 4 to 6 weeks
- Weight at study initiation: 109 to 150 g
- Fasting period before study: yes; overnight prior to and 4 h after dosing
- Housing: in groups by sex in metal cages with wire mesh floor
- Diet (e.g. ad libitum): standard laboratory rodent diet (Labsure LAD 1), ad libitum
- Water (e.g. ad libitum): ad libitum
- Acclimation period: minimum 8 d

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 20 to 23°C
- Humidity (%): 62% mean
- Air changes (per hr): ca. 15/h
- Photoperiod (hrs dark / hrs light): 12/12

Administration / exposure

Route of administration:

oral: gavage

Vehicle:

other: distilled water

Details on oral exposure:

Vehicle
- Concentration in vehicle: 80%
- Amount of vehicle (if gavage): 20 mL/kg bw

Doses:

0, 16.0 g/kg bw

No. of animals per sex per dose:

preliminary study: 2
main study: 10

Control animals:

yes

Details on study design:

- Duration of observation period following administration: preliminary study 5 d; main study 14 d
- Frequency of observations and weighing: (a) bodyweights: Day 1 (day of dosing), 4, 8, 15 (b) clinical signs: soon after dosing, then at frequent intervals for the remainder of Day 1. On subsequent days the animals were observed at least once in the morning and once at the end of the experimental day (on Saturdays and Sundays app. 11:30 a.m.)
- Necropsy of survivors performed: yes

Statistics:

none

Results and discussion

Preliminary study:

0/4 animals died in the preliminary test.

Effect levels

Key result

Sex:

male/female

Dose descriptor:

LD50

Effect level:

> 16 000 mg/kg bw

Based on:

test mat.

Mortality:

0/20 animals died in the main study

Clinical signs:

other: - Piloerection in 20/20 animals in treated group; recovery on Day 3 - No clinical signs in control group

Gross pathology:

- Terminal autopsy findings were normal

Other findings:

None

Applicant's summary and conclusion

Interpretation of results:

other: Not classified based on EU CLP criteria

Conclusions:

Under the study conditions, the oral LD50 in rats for test substance was determined to be >16000 mg/kg bw.

Executive summary:

A study was conducted to determine the acute toxicity of the test substance, di- C16 PSE (purity: 100%), according to the notification no. 118 of the Pharmaceuticals Affairs Bureau, 15 Feb 1984, Toxicity Test Guideline (similar to OECD guideline 401). Groups of fasted, 4 to 6 weeks old CFY (Sprague-Dawley origin) rats, 10/sex were given a single oral dose of test substance in distilled water at doses of 0 (control) and 16 g/kg bw and observed for 14 d. No mortality occurred. Piloerection was observed in all animals in the treated group, however, the animals had recovered on Day 3. No effects on body weight were observed. Terminal necropsy findings were found to be normal. Under the study conditions, the oral LD50 in rats for test substance was determined to be >16000 mg/kg bw (Kynoch, 1985).