Phosphoric Acid, C8-12(even-numbered) linear Alkyl Esters

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2002

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2002

Report date:

2002

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

other: Department of Transportation, Method of Testing Corrosion to Skin

Version / remarks:

Federal Register, Vol 41, No 118, Sept 27 1976

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

Version / remarks:

1992

Deviations:

no

GLP compliance:

not specified

Test material

Test material information

Constituent 1

Reference substance name:

Phosphoric acid, mono(C8-12 (even-numbered) linear alkyl) ester

Molecular formula:

Not applicable (UVCB)

IUPAC Name:

Phosphoric acid, mono(C8-12 (even-numbered) linear alkyl) ester

Constituent 2

Reference substance name:

Phosphoric acid, di(C8-12 (even-numbered) linear alkyl) ester

Molecular formula:

Not applicable (UVCB)

IUPAC Name:

Phosphoric acid, di(C8-12 (even-numbered) linear alkyl) ester

Test material form:

liquid

Details on test material:

Phosphoric acid, C8-12 (even-numbered) - linear alkyl) esters (1.5 ester groups per molecule)

Test animals

Species:

rabbit

Strain:

New Zealand White

Remarks:

albino

Details on test animals or test system and environmental conditions:

ANIMALS AND ANIMAL HUSBANDRY
- Rabbits were sourced from Kuiper Rabbitry, Gary, Indiana, USA and were approximately 8-10 weeks old.
- Animals were housed individually in stainless steel cages in a temperature, humidity and light controlled room.
- Rabbits were conditioned for at least three days prior to study initiation.
- Purina Rabbit Chow and water were available ad libitum.
- All animals used for the investigation were considered to be in good health at study initiation.

Test system

Type of coverage:

occlusive

Preparation of test site:

not specified

Vehicle:

unchanged (no vehicle)

Controls:

no

Amount / concentration applied:

0.5 mL

Duration of treatment / exposure:

3 minutes, 1 hour and 4 hours

Observation period:

7 days

Number of animals:

Six

Details on study design:

COMPOUND ADMINISTRATION
- Three intact sites were prepared on each of the six animals.
- A dose of 0.5 mL of the test article was applied to the occluded sites for contact periods of 3 minutes (site A), 1 hour (site B) and 4 hours (site C).
- At the conclusion of the individual contact periods, any remaining test material was wiped from the site.
- If necrosis was observed at the shorter contact periods the test was considered to be concluded and longer exposure times were not required.

CLINICAL OBSERVATIONS
- Observations for irritation, ulceration and necrosis were performed at the end of each contact period.
- Observations were repeated at 60 minutes for the 3 minute contact time.
- Observations were repeated at 24, 48 and 72 hours following test article application for the 1 and 4-hour contact times.
- Additional readings were continued up to Day 7 to confirm transport packing group
- Corrosion was considered to have resulted if the substance in contact with rabbit skin produced full thickness destruction or irreversible alteration of tissue.
- Tissue destruction was considered to have occurred if ulceration and/or necrosis was observed at any of the readings.
- Tissue destruction did not include merely sloughing of the epidermis, erythema, edema or fissuring.
- Scoring crieria used during evaluation of skin reactions are given in Table 2 (attached).

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

erythema score

Basis:

mean

Remarks:

3 min contact time

Time point:

other: 3 min

Score:

0

Max. score:

4

Reversibility:

other: not applicable

Remarks:

site A

Remarks on result:

other:

Remarks:

Animals 53, 54, 55, 56, 57 and 58

Results 2

Irritation parameter:

erythema score

Basis:

mean

Remarks:

3 min contact time

Time point:

other: 1 h

Score:

0

Max. score:

4

Reversibility:

other: not applicable

Remarks:

site A

Remarks on result:

other: not corrosive after 3 min contact time

Remarks:

Animals 53, 54, 55, 56, 57 and 58

Results 3

Irritation parameter:

erythema score

Basis:

animal #1

Remarks:

1 h contact time

Time point:

24/48/72 h

Score:

2

Max. score:

4

Reversibility:

not reversible

Remarks:

site B

Remarks on result:

other: Animal 53

Remarks:

Necrosis reported at 7 d observation

Results 4

Irritation parameter:

erythema score

Basis:

animal #2

Remarks:

1 h contact time

Time point:

24/48/72 h

Score:

3

Max. score:

4

Reversibility:

not reversible

Remarks:

site B

Remarks on result:

other: Animal 54

Remarks:

Score unchanged at 7 d observation

Results 5

Irritation parameter:

erythema score

Basis:

animal #3

Remarks:

1 h contact time

Time point:

24/48/72 h

Score:

4

Max. score:

4

Reversibility:

not reversible

Remarks:

site B

Remarks on result:

other: Animal 55

Remarks:

Necrosis reported at 72 h observation

Results 6

Irritation parameter:

erythema score

Basis:

animal #4

Remarks:

1 h contact time

Time point:

24/48/72 h

Score:

3

Max. score:

4

Reversibility:

not reversible

Remarks:

site B

Remarks on result:

other: Animal 56

Remarks:

Score unchanged at 7 d observation

Results 7

Irritation parameter:

erythema score

Basis:

animal #5

Remarks:

1 h contact time

Time point:

24/48/72 h

Score:

3

Max. score:

4

Reversibility:

not reversible

Remarks:

site B

Remarks on result:

other: Animal 57

Remarks:

Score unchanged at 7d observation

Results 8

Irritation parameter:

erythema score

Basis:

animal #6

Remarks:

1 h contact time

Time point:

24/48/72 h

Score:

3

Max. score:

4

Reversibility:

not reversible

Remarks on result:

other: Animal 58

Remarks:

Necrosis reported at 7 d observation

Irritant / corrosive response data:

- Data showing individual responses of each animal are attached.
- Occluded contact with the test material for three minutes produced no irritation and necrosis was not observed in any of the six animals.
- Occluded contact with the test material for one hour produced severe irritation and necrosis was observed in three of the six animals within 7 days.
- Occluded contact with the test material for four hours caused necrosis in all six animals.

Applicant's summary and conclusion

Interpretation of results:

Category 1B (corrosive) based on GHS criteria

Conclusions:

Occluded contact with the test item for one hour produced severe irritation (erythema scores at 24/48/72 hours ≥ 2.3 in 5/6 animals) and necrosis was observed in three of the six animals within 7 days. On the basis of this study, the test material is found to be corrosive to skin.

Executive summary:

In a study performed in accordance with US D.O.T. regulations and OECD 404, the test item was applied to three prepared skin sites on New Zealand White rabbits under occluded conditions for 3 minutes, 1 hour and 4 hours. After the relevant contact period, any remaining test item was wiped from the site. After removal of patches and 24, 48 and 72 hours later, the test sites were examined for evidence of primary irritation and scored for erythema. No effects were noted over a period of 60 minutes following contact with the test item for 3 minutes. However, occluded contact with the test item for one hour produced severe irritation (erythema scores at 24/48/72 hours ≥ 2.3 in 5/6 animals) and necrosis was observed in three of the six animals within 7 days. On the basis of this study, the test material is found to be corrosive to skin.