Quaternary ammonium compounds, bis(hydrogenated tallow alkyl)dimethyl, acetates

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vivo

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Study period:

From 1986-02-11 to 1986-02-25

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

comparable to guideline study with acceptable restrictions

Remarks:

Although this study is guideline and GLP compliant and would normally be assigned a reliability of 1 (reliable without restrictions), this study is used for read-across and therefore has been assigned a reliability of 2 (reliable with restrictions).

Justification for type of information:

The primary component of all substances provide complete coverage of 68334-33-8. 68334-33-8 shares high structural similarity with 61789-80-8, 68783-78-8, 107-64-2, and 112-02-7. As 68334-33-8 is a UVCB its components encapsulate the other substances except for the counter ion (Cl-). In solution, the counter ions will dissociate from the parent structures. Therefore, we are comparing substances of equivalent nature. CAS 107-64-2 represents the C18 boundary of the 61789-80-8. Ignoring the salt component CAS 61789-80-8 is equivalent to CAS 68334-33-8. 68783-78-8 is a worst case of both 68334-33-8 and 61789-80-8 since it is unsaturated and the SP2 carbon-carbon bonds are of higher reactivity and a more likely site of metabolic activation. The primary component of CAS 112-02-7 is a substructure of all the other substances. Additional documentation, provided within the IUCLID Assessment Reports section, supports the read-across approach.

Cross-reference

Reason / purpose for cross-reference:

read-across: supporting information

Reference

Endpoint:

skin irritation: in vivo

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

key study

Justification for type of information:

The primary component of all substances provide complete coverage of 68334-33-8. 68334-33-8 shares high structural similarity with 61789-80-8, 68783-78-8, 107-64-2, and 112-02-7. As 68334-33-8 is a UVCB its components encapsulate the other substances except for the counter ion (Cl-). In solution, the counter ions will dissociate from the parent structures. Therefore, we are comparing substances of equivalent nature. CAS 107-64-2 represents the C18 boundary of the 61789-80-8. Ignoring the salt component CAS 61789-80-8 is equivalent to CAS 68334-33-8. 68783-78-8 is a worst case of both 68334-33-8 and 61789-80-8 since it is unsaturated and the SP2 carbon-carbon bonds are of higher reactivity and a more likely site of metabolic activation. The primary component of CAS 112-02-7 is a substructure of all the other substances. Additional documentation, provided within the IUCLID Assessment Reports section, supports the read-across approach.

Reason / purpose for cross-reference:

read-across source

Irritation parameter:

erythema score

Basis:

animal #1

Time point:

24/48/72 h

Score:

2

Max. score:

4

Reversibility:

fully reversible within: 14 days

Irritation parameter:

erythema score

Basis:

animal #2

Time point:

24/48/72 h

Score:

1

Max. score:

4

Reversibility:

fully reversible within: 14 days

Irritation parameter:

erythema score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0.3

Max. score:

4

Reversibility:

fully reversible within: 2 days

Irritation parameter:

edema score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0

Max. score:

4

Irritation parameter:

edema score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Max. score:

4

Irritation parameter:

edema score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0

Max. score:

4

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1996

Report date:

1996

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)

Test material

Test material information

Constituent 1

Reference substance name:

Dimethyldioctadecylammonium chloride

EC Number:

203-508-2

EC Name:

Dimethyldioctadecylammonium chloride

Cas Number:

107-64-2

Molecular formula:

C38H80N.Cl

IUPAC Name:

N,N-dimethyl-N-octadecyloctadecan-1-aminium chloride

Test animals

Species:

rabbit

Strain:

New Zealand White

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Hoechst AG, Kastengrund
- Age at study initiation: 3-5 months
- Weight at study initiation: 2.2-3.4 kg
- Housing: individually
- Diet: ad libitum
- Water : ad libitum
- Acclimation period: 1 week prior to the start of the study

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 20±3°C
- Humidity (%): 50±20%
- Photoperiod : 12 hrs dark / 12 hrs light

Test system

Type of coverage:

semiocclusive

Preparation of test site:

shaved

Vehicle:

physiological saline

Controls:

other: each animal served as its own control

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied : 0.5 g
- Concentration (if solution):

VEHICLE
- Amount(s) applied : 0.9ml isotonic saline.
0.5 g test substance pasted with 0.9 ml isotonic saline.

Duration of treatment / exposure:

4 hours

Observation period:

30 min, 60 min, 24, 48, 72 hrs and 7d, 14d after removal the patch

Number of animals:

3 rabbits

Details on study design:

TEST SITE
- Area of exposure: skin of the back
- % coverage: 2.5 cm x 2.5 cm
- Type of wrap if used: semi-occlusive

REMOVAL OF TEST SUBSTANCE
- Washing (if done): residual test substance was removed from skin with warm tap water
- Time after start of exposure: 4 hours

SCORING SYSTEM: according to OECD guideline 404 (draize scoring system)

Results and discussion

In vivo

Results

Results 1

Irritation parameter:

erythema score

Basis:

animal #1

Time point:

24/48/72 h

Score:

2

Max. score:

4

Reversibility:

fully reversible within: 14 days

Results 2

Irritation parameter:

erythema score

Basis:

animal #2

Time point:

24/48/72 h

Score:

1

Max. score:

4

Reversibility:

fully reversible within: 14 days

Results 3

Irritation parameter:

erythema score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0.3

Max. score:

4

Reversibility:

fully reversible within: 2 days

Results 4

Irritation parameter:

edema score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0

Max. score:

4

Results 5

Irritation parameter:

edema score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Max. score:

4

Results 6

Irritation parameter:

edema score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0

Max. score:

4

Irritant / corrosive response data:

30-60 minutes and 24 hours after patch removal the animals showed very slight to well defined erythema. 48 hours to 7 days after patch removal two rabbits showed a very slight or well defined erythema. 14 days after application erythema and oedema formation were reversed. Additionally, the treated skin areas were sporadically dry-rough, discoloured light brown and fine or coarse scaly during the observation period.

Any other information on results incl. tables

 

Individual skin irritation scores according to the OECD 404 Guideline
Time after patch removal	30-60 minutes			24 h			48 h			72 h			7 d			14 d
Animal no.	1	2	3	1	2	3	1	2	3	1	2	3	1	2	3	1	2	3
Erythema	2	1	1	2	1	1	2	1	0	2	1	0	2	1	0	0	0	0
Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Skin surface
- dry rough						X	X		X	X	X	X	X	X	X	X	X
- fine scaly						X								X			X
- coarse scaly													X			X
- large disol. light brown										X

 

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Conclusions:

Under the experimental conditions of this study and according to the criteria laid down in CLP (Reg 1272/2008/EC) and directive 67/548/EEC, the test item dimethyldioctadecylammonium chloride (purity 97%) is not classified.

Executive summary:

The potential of Dimethyldioctadecylammonium chloride (purity 97%) to induce skin irritation was assessed in 3 rabbits according to the OECD guideline 404 and to the EU Method B.4. The study was conducted in compliance with the principles of Good Laboratory Practice regulations.

 

A single dose of 0.5 g pasted with 0.9 ml isotonic saline was applied to the skin of the rabbits under a semi-occlusive dressing for a 4-hour exposure period. Skin reactions were observed approximately 0.5, 1, 24, 48 and 72 hours after removal of the dressing and then on day 7, 14 in order to observe their reversibility. The mean values of the scores for erythema and oedema were calculated for each animal.

 

The mean scores over 24, 48 and 72 hours for individual animals were 2.0, 1.0, and 0.3 for erythema and 0.0, 0.0, and 0.0 for oedema and all reactions reversed within 14 days. Oedema were not observed. In addition, the treated skin sites were sporadically dry-rough, discoloured light brown and fine or coarse scales occurred during the observation period of 14 days. Based on the study results, the test material is not subject to labelling requirements with regard to skin irritation.