2,2-bis(hydroxymethyl)propionic acid

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

04 June 2007 to 19 June 2007

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study without detailed documentation

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2007

Report date:

2007

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.4 (Acute Toxicity: Dermal Irritation / Corrosion)

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

2,2-bis(hydroxymethyl)propionic acid

EC Number:

225-306-3

EC Name:

2,2-bis(hydroxymethyl)propionic acid

Cas Number:

4767-03-7

Molecular formula:

C5H10O4

IUPAC Name:

3-hydroxy-2-(hydroxymethyl)-2-methylpropanoic acid

Specific details on test material used for the study:

- Name of the test material used in the study report: Dimethylpropionic acid
- Batch no.: not given
- Purity: not given
- Appearance: not given
- Expiry date: not given
- Storage conditions: not given

Test animals

Species:

rabbit

Strain:

New Zealand White

Details on test animals or test system and environmental conditions:

The animals were male and female New Zealand White rabbits, supplied by Velaz (Prague). At the start of the study animals weighed 2-2.5 kg. The rabbits were acclimatised for 21 days, during which time the health status of the rabbits was observed. The animals were housed individually in suspended metal cages, and had free access to drinking water and food. The animal room was maintained at a temperature of 17-20°C, and relative humidity of 49-56%. The animals were subjected to a 12 hour light: 12 hour dark cycle.

Test system

Type of coverage:

semiocclusive

Preparation of test site:

shaved

Vehicle:

unchanged (no vehicle)

Controls:

no

Amount / concentration applied:

500 mg of the test material was applied to the skin

Duration of treatment / exposure:

Four hours

Observation period:

5 days following patch removal

Number of animals:

2 males and 1 female.

Details on study design:

The study was conducted according to OECD guideline 404. The day before the test, the dorsal flank of each rabbit was clipped free of fur using veterinary clippers. Only animals with a healthy intact epidermis (assessed by gross observation) were selected for the study.
On the day of the test a suitable test site was selected on the back of each rabbit. A quantity of 500 mg of the test material was introduced under a 2.5x2.5 cm gauze patch and placed in position of the shaved skin. The patch was secured in position with a strip of surgical adhesive tape.
Four hours after application the patches were removed and any residual test material was removed by gentle swabbing with cotton wool soaked in distilled water. The test sites were examined for signs of primary irritation after patch removal 1, 24, 48 hours and 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 days later.

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

erythema score

Basis:

animal #1

Time point:

24/48/72 h

Score:

1

Max. score:

1

Reversibility:

fully reversible within: 5 days

Results 2

Irritation parameter:

erythema score

Basis:

animal #2

Time point:

24/48/72 h

Score:

1

Max. score:

1

Reversibility:

fully reversible within: 4 days

Results 3

Irritation parameter:

erythema score

Basis:

animal #3

Time point:

24/48/72 h

Score:

1

Max. score:

1

Reversibility:

fully reversible within: 5 days

Results 4

Irritation parameter:

edema score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0

Max. score:

0

Reversibility:

other: no effect observed

Results 5

Irritation parameter:

edema score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Max. score:

0

Reversibility:

other: no effect observed

Results 6

Irritation parameter:

edema score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0

Max. score:

0

Reversibility:

other: no effects observed

Irritant / corrosive response data:

The test substance produced a very slight erythema in all 3 rabbits, noticeable 24 hours after patch removal and persisting for 3-4 days following patch removal. No other signs of irritation were noted. The very slight erythema observed in all animals was fully reversible within 5 days.

Other effects:

None reported.

Any other information on results incl. tables

Table 1: Dermal reactions

 

Observation	Timepoint
	1h	24h	48h	72h	Mean (24-72h)	4d	5d
Erythema	0,0,0	1,1,1	1,1,1	1,1,1	1	1,0,1	0,0,0
Oedema	0,0,0	0,0,0	0,0,0	0,0,0	0.00	0,0,0	0,0,0

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

The substance was not irritating to the skin.

Executive summary:

In a primary dermal irritation study (conducted according to OECD TG 404), New Zealand White rabbits (2 male and 1 female) were dermally exposed to 500 mg of Dimethylolpropionic acid for 4 hours under a 2.5 x 2.5 semi-occlusive patch. Upon removal of the patch any residual test material was removed and the test sites were examined for signs of primary irritation at 1, 24, 48 hours and 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 and 14 days. The test substance produced a very slight erythema in all 3 rabbits, noticeable 24 hours after patch removal and persisting for 3-4 days following patch removal. No other signs of irritation were noted. This very slight erythema observed in all animals was fully reversible within 5 days. In this study, Dimethylolpropionic acid is not a dermal irritant.