Fatty acids, C9-13-neo-, zinc salts

Endpoint summary

Description of key information

Skin irritation: not irritating (OECD 404, GLP)
Eye irritation: not irritating (OECD 405; GLP compliant)

Key value for chemical safety assessment

Skin irritation / corrosion

Link to relevant study records

Reference

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2013-03-21 to 2013-04-05

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

Version / remarks:

adopted 2002-04-24

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

signed 2009-11-12

Species:

rabbit

Strain:

Himalayan

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: LPT Laboratory of Pharmacology and Toxicology GmbH & Co. KG, Branch Löhndorf, 24601 Löhndorf/Post Wankendorf, Germany
- Age at study initiation: approximately 6 - 8 months
- Weight at study initiation: 3.0 - 3.4 kg
- Housing: before and after the 4-hour exposure period, the animals were kept singly in cages measuring 380 mm x 425 mm x 600 mm (manufacturer: Dipl. Ing. W. EHRET GmbH, 16352 Schönwalde, Germany). During the exposure period, the animals were kept singly in restrainers which allowed free movement of the head but prevented a complete body turn. The cages excluded irritation of the skin by excrements and urine.
- Diet (ad libitum; before and after exposure period): commercial diet, ssniff® K-H V2333 (ssniff Spezialdiäten GmbH, 59494 Soest, Germany)
- Water (ad libitum; before and after exposure period): drinking water
- Acclimation period: at least 20 adaptation days

ENVIRONMENTAL CONDITIONS
- Temperature: 20°C ± 3°C (maximum range)
- Relative humidity: 30% - 70% (maximum range)
- Photoperiod (hrs dark / hrs light): 12/12

Type of coverage:

semiocclusive

Preparation of test site:

shaved

Vehicle:

water

Controls:

no

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 500 mg of the test item was applied to the test site.
1000 mg of the test item were mixed with 500 mg aqua ad iniectabilia (Batch no. 123868001, B. Braun Melsungen AG, 34212 Melsungen, Germany), 750 mg of this paste were applied per animal (approx. 500 mg test item/animal)

Duration of treatment / exposure:

4 hours

Observation period:

Prior to the administration and 60 minutes, 24, 48 and 72 hours after the exposure period

Number of animals:

3 female rabbits

Details on study design:

TEST SITE
- Area of exposure: approximately 24 hours before the test, the fur was removed by closely clipping the dorsal area of the trunk of the animals. Care was taken to avoid abrading the skin. Only animals with healthy intact skin were used.
The test item was applied to the test site (area: approx. 6 cm2) and then covered with a gauze patch. The patch was held in contact with the skin with non-irritating tape for the duration of the exposure period. The surrounding untreated skin served as a control.

INITIAL TEST AND CONFIRMATORY TEST
As it was expected that the test item would not produce any irritancy, all 3 animals were applied at one time, i.e. no initial test was carried out.

SCORING SYSTEM: according to the Draize scale

Irritation parameter:

erythema score

Basis:

mean

Remarks:

animal #1

Time point:

other: 24, 48 and 72 hours

Score:

0

Max. score:

4

Irritation parameter:

edema score

Basis:

mean

Remarks:

animal #1

Time point:

other: 24, 48 and 72 hours

Score:

0

Max. score:

4

Irritation parameter:

erythema score

Basis:

mean

Remarks:

animal #2

Time point:

other: 24, 48 and 72 hours

Score:

0

Max. score:

4

Remarks on result:

other: Very slight erythema was observed during the 60 minute observation.

Irritation parameter:

edema score

Basis:

mean

Remarks:

animal #2

Time point:

other: 24, 48 and 72 hours

Score:

0

Max. score:

4

Irritation parameter:

erythema score

Basis:

mean

Remarks:

animal #3

Time point:

other: 24, 48 and 72 hours

Score:

0

Max. score:

4

Remarks on result:

other: Very slight erythema was observed during the 60 minute observation.

Irritation parameter:

edema score

Basis:

mean

Remarks:

animal #3

Time point:

other: 24, 48 and 72 hours

Score:

0

Max. score:

4

Irritant / corrosive response data:

Three rabbits exposed for 4 hours to 500 mg Fatty acids, C9-13-neo, zinc salts/animal showed following skin reactions:
Very slight erythema (grade 1) was observed in two animals 60 minutes after patch removal.

Other effects:

There were no systemic intolerance reactions.

Interpretation of results:

not irritating

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

The test substance is not irritating to the skin.
According to the EC-Commission directive 67/548/EEC and its subsequent amendments, the test substance is not irritating to the skin.
According to the EC-Regulation 1272/2008 and subsequent regulations, the test item is not classified as skin irritant.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Eye irritation

Link to relevant study records

Reference

Endpoint:

eye irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2013-01-22 to 2013-02-07

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 405 (Acute Eye Irritation / Corrosion)

Version / remarks:

adopted 2002-04-24

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

signed 2012-11-30

Species:

rabbit

Strain:

New Zealand White

Details on test animals or tissues and environmental conditions:

TEST ANIMALS - New Zealand White (Hsdlf:NZW) strain rabbits
- Source: Harlan Laboratories UK Ltd., Leicestershire, UK
- Age at study initiation: twelve to twenty weeks old
- Weight at study initiation: 2.60 or 2.72 kg
- Housing: the animals were individually housed in suspended cages.
- Diet (ad libitum): 2930C Teklad Global Certified Rabbit diet supplied by Harlan Laboratories UK Ltd., Oxon, UK)
- Water (ad libitum): mains drinking water
- Acclimation period: at least five days

The animals were provided with environmental enrichment items which were considered not to contain any contaminant of a level that might have affected the purpose or integrity of the study.

ENVIRONMENTAL CONDITIONS
- Temperature: 17 to 23°C
- Relative humidity: 30 to 70%
- Air exchange: at least fifteen changes per hour
- Photoperiod (hrs dark / hrs light): 12/12

Vehicle:

unchanged (no vehicle)

Controls:

no

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): a volume of 0.1 mL of the test item, which was found to weigh approximately 87 mg was placed into the conjunctival sac of the right eye, formed by gently pulling the lower lid away from the eyeball. The upper and lower eyelids were held together for about one second immediately after treatment, to prevent loss of the test item, and then released. The left eye remained untreated and was used for control purposes.

Duration of treatment / exposure:

not applicable

Observation period (in vivo):

Approximately 1 hour and 24, 48 and 72 hours following treatment as well as on Day 7

Number of animals or in vitro replicates:

2 male rabbits

Details on study design:

Immediately before the start of the test, both eyes of the provisionally selected test rabbits were examined for evidence of ocular irritation or defect with the aid of a light source from a standard ophthalmoscope. Only animals free of ocular damage were used.

INITIAL AND CONFIRMATORY TEST
Initially, a single rabbit was treated. Immediately after administration of the test item, an assessment of the initial pain reaction was made according to the six point scale (please refer to table 2 in the field "Any other information on materials and methods incl. tables" below).
After consideration of the ocular responses produced in the first treated animal, a second animal was treated.

SCORING SYSTEM: according to the Draize scale
Any other ocular effects were also noted.
Any clinical signs of toxicity, if present, were also recorded.
Individual body weights were recorded on Day 0 (the day of dosing) and at the end of the observation period.
If evidence of irreversible ocular damage is noted, the test item will be classified as corrosive to the eye.

TOOL USED TO ASSESS SCORE: examination of the eye was facilitated by the use of the light source from a standard ophthalmoscope.

Irritation parameter:

cornea opacity score

Basis:

mean

Remarks:

animal #1

Time point:

other: 24, 48 and 72 hours

Score:

0

Max. score:

4

Remarks on result:

other: Initial pain reaction: slight initial pain; Slight discharge was observed 1 hour after test substance administration.

Irritation parameter:

iris score

Basis:

mean

Remarks:

animal #1

Time point:

other: 24, 48 and 72 hours

Score:

0

Max. score:

2

Remarks on result:

other: Slight iridial inflammation was observed 1 hour after test substance administration.

Irritation parameter:

conjunctivae score

Basis:

mean

Remarks:

animal #1

Time point:

other: 24, 48 and 72 hours

Score:

1.33

Max. score:

3

Reversibility:

fully reversible within: 7 days

Remarks on result:

other: Moderate conjunctivae redness was observed 1 hour after test substance administration.

Irritation parameter:

chemosis score

Basis:

mean

Remarks:

animal #1

Time point:

other: 24, 48 and 72 hours

Score:

0.67

Max. score:

4

Reversibility:

fully reversible within: 72 hours

Remarks on result:

other: Moderate chemosis was observed 1 hour after test substance administration.

Irritation parameter:

cornea opacity score

Basis:

mean

Remarks:

animal #2

Time point:

other: 24, 48 and 72 hours

Score:

0

Max. score:

4

Remarks on result:

other: Initial pain reaction: practically no initial pain; Slight discharge was observed 1 hour and 24 hours after test substance administration.

Irritation parameter:

iris score

Basis:

mean

Remarks:

animal #2

Time point:

other: 24, 48 and 72 hours

Score:

0

Max. score:

2

Remarks on result:

other: Slight iridial inflammation was observed 1 hour after test substance administration.

Irritation parameter:

conjunctivae score

Basis:

mean

Remarks:

animal #2

Time point:

other: 24, 48 and 72 hours

Score:

0.67

Max. score:

3

Reversibility:

fully reversible within: 72 hours

Remarks on result:

other: Moderate conjunctivae redness was observed 1 hour after test substance administration.

Irritation parameter:

chemosis score

Basis:

mean

Remarks:

animal #2

Time point:

other: 24, 48 and 72 hours

Score:

0.33

Max. score:

4

Reversibility:

fully reversible within: 48 hours

Remarks on result:

other: Slight chemosis was observed 1 hour after test substance administration.

Irritant / corrosive response data:

No corneal effects were noted during the study.
Iridial inflammation was noted in both treated eyes one hour after treatment.
Moderate conjunctival irritation was noted in both treated eyes one hour after treatment. Minimal conjunctival irritation was noted in both treated eyes at the 24 and 48-Hour observations and persisted in one treated eye at the 72-Hour observation.
One treated eye appeared normal at the 72-Hour observation and the other treated eye appeared normal at the 7-Day observation.

Other effects:

- Body weight: both animals showed expected gain in body weight during the study.

Interpretation of results:

not irritating

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

The test material is not irritating to the eyes.
According to 67/548/EC and subsequent regulations, the substance is not classified as an eye irritant.
According to the EC Regulation No. 1272/2008 and subsequent regulations, the substance is not classified as an eye irritant.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Additional information

Skin irritation

One reliable in vivo study described by Hansen (2013)(OECD 404; GLP compliant) is considered to be reliable without restrictions.The substance was determined not to be irritating to the skin.

Eye irritation

One reliable in vivo study described by Sanders (2013) (OECD 405; GLP compliant) is considered to be reliable without restrictions. The substance was determined to be not irritating to the eye.

Furthermore, a reliable in vitro study described by Heppenheimer (2013) (OECD 437; GLP compliant) is considered to be reliable without restrictions. The substance was determined to be neither corrosive nor severely irritating to the eye.

Justification for selection of skin irritation / corrosion endpoint:
Key study

Justification for selection of eye irritation endpoint:
Key study

Justification for classification or non-classification

Skin irritation

Reference Hansen (2013) is considered as the key study for in vivo skin irritation and will be used for classification. The skin irritation was scored according to the Draize scale. The mean score (24, 48, 72 h) for erythema and oedema for all three animals were as follows:

Erythema: 0 for all animals

Oedema: 0 for all animals

Thus, according to Regulation (EC) 1272/2008 and subsequent amendments the substance will not be classified as irritating to the skin. Furthermore, the substance has not to be classified as skin irritant according to Directive 67/548 EC.

Eye irritation

Reference Sanders (2013) is considered as the key study for in vivo eye irritation and will be used for classification.During the study the test item was applied to one eye of two animals each and the eye irritation was scored according to the Draize scale. The following mean scores (24, 48 and 72 hours) were obtained for the two animals:

cornea: 0 for both animals

iris:0 for both animals

conjunctival redness: 1.33 and 0.67

chemosis: 0.67 and 0.33

The ocular effects were fully reversible within 7 days.Thus, according to Regulation (EC) 1272/2008 and subsequent amendments the substance will not be classified as irritating to the eyes. Furthermore, the substance has not to be classified as eye irritant according to Directive 67/548 EC.