Fatty acids, C18 (saturated and unsaturated) ethyl esters

Endpoint summary

Description of key information

Two GLP studies on skin and eye irritation have been carried out on read-cross substance (CAS No 67762-38-3). The substance is neither a skin nor an eye irritant.

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:

From 1984-03-26 to 1984-07-31

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: The study was performed according to OECD guideline 404 and GLP. Test on read-cross substance used for this registration (CAS No 67762-38-3)

Justification for type of information:

This read-across is based on the hypothesis that source and target substances have similar toxicological properties. Both are UVCB substances being mixtures of fatty acid esters. Both are hydrolysed enzymatically to common products, i.e. the same fatty acids and to non-common products, i.e. methanol and ethanol in the case of the source substances respectively the target source. Methanol and ethanol have similar toxicological profiles. A read-across justification document is attached in section 13.

Qualifier:

according to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

Principles of method if other than guideline:

NA

GLP compliance:

yes

Species:

rabbit

Strain:

other: New Zealand White: Hy/Cr

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: Charles River France (76410 Saint Aubin les Elbeuf, France)
- Age at study initiation: no data
- Weight at study initiation: 2.35 kg +/- 0.05 kg
- Housing: individually in polystyrene cage (35 x 55 x 32 cm).
- Diet: rabbit diet SQC (Special diets Services Ltd, Witham, Essex, England), ad libitum
- Water: filtered water with 0.22 µm Millipore membrane (Millipore, 67120 Molsheim, France), ad libitum
- Acclimation period: 8 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 20°C +/- 3°C
- Humidity (%): 50 % +/- 20 %
- Air changes (per hr): no data (filtered Air)
- Photoperiod (hrs dark / hrs light): 12 hrs dark / 12 hrs light

IN-LIFE DATES: From: 1984-05-18 To: 1984-05-21

Type of coverage:

semiocclusive

Preparation of test site:

other: clipped

Vehicle:

unchanged (no vehicle)

Controls:

other: untreated left flank

Amount / concentration applied:

Amount(s) applied (volume or weight with unit): 0.5 ml

Duration of treatment / exposure:

4 hours

Observation period:

3 days

Number of animals:

6

Details on study design:

TEST SITE
- Area of exposure: right flank (6 cm2)
- % coverage: no data
- Type of wrap if used: A gauze pad was applied on the tested area and was held in contact with the skin by means of an adhesive hypoallergenic
semi-occlusive dressing.

REMOVAL OF TEST SUBSTANCE: No

SCORING SYSTEM: according to the grading of skin reactions described in OECD guideline 404.

Other effects / acceptance of results:

NA

Irritation parameter:

erythema score

Basis:

mean

Time point:

other: 24, 48, 72h

Score:

> 0 - < 0.33

Max. score:

4

Reversibility:

fully reversible within: 48h

Irritation parameter:

edema score

Basis:

mean

Time point:

other: 24, 48, 72h

Score:

0

Max. score:

4

Irritant / corrosive response data:

Slight erythema was observed in all animals after one hour exposure and disappeared completely after 3 days. No edema was reported.
See table 1 in field "Remarks on results including tables and figures".

Other effects:

No other local or systemic effects were observed.

Table1: Irritant/corrosive response data for each animal at each observation time up to removal of each animal from the test

Score at time point/ Reversibility	Erythema Max. score: 4	Edema Max. score: 4
60 min	2/2/2/2/2/2	0/0/0/0/0/0
24 h	0/1/0/1/0/0	0/0/0/0/0/0
48 h	0/0/0/0/0/0	0/0/0/0/0/0
72 h	0/0/0/0/0/0	0/0/0/0/0/0
Average 24h, 48h, 72h	0.33/0/0	0
Reversibility*)	c.	-

*) Reversibility: c.=completely reversible; n.c.= not completely reversible; n= not reversible

Grading of skin reactions:

Erythema and Eschar Formation

0 = No erythema

1 = Very slight erythema (barely perceptible)

2 = Well defined erythema

3 = Moderate to severe erythema

4 = Severe erythema (beef redness) to eschar formation preventing grading of erythema

Edema Formation

0 = No edema

1 = Very slight edema (barely perceptible)

2 = Slight edema (edges of area well defined by definite raising)

3 = Moderate edema (raised approximately 1 mm)

4 = Severe edema (raised more than 1 mm and extending beyond area of exposure)

Interpretation of results:

slightly irritating

Remarks:

Migrated information Criteria used for interpretation of results: other: EU-GHS

Conclusions:

Metiloil A was not considered to be a skin irritant.

Executive summary:

In a primary dermal irritation study (Kaysen A., 1984), young adult New Zealand White rabbits (6 males) were exposed by dermal contact to 0.5 ml of Metiloil A (batch No. 1169) (CAS No 67762-38-3) onto one flank. Test sites were covered with a semi-occlusive dressing for 4 hours. Animals then were observed for 3 days. Irritation was scored by the grading of skin reactions described in the OECD guideline 404. Slight erythema was observed in all animals after one hour exposure and disappeared completely after 3 days. No edema was observed. Mean scores over 1, 24, 48 and 72 hours were 2, 0.33, 0 and 0 for erythema and 0, 0, 0 and 0 for edema, respectivelly.

In this study, metiloil A is slightly irritating when applied topically to rabbit skin, but not classified according to the EU-GHS criteria.

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:

From 1984-03-26 To 1984-07-30

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Justification for type of information:

This read-across is based on the hypothesis that source and target substances have similar toxicological properties. Both are UVCB substances being mixtures of fatty acid esters. Both are hydrolysed enzymatically to common products, i.e. the same fatty acids and to non-common products, i.e. methanol and ethanol in the case of the source substances respectively the target source. Methanol and ethanol have similar toxicological profiles. A read-across justification document is attached in section 13.

Qualifier:

according to guideline

Guideline:

OECD Guideline 405 (Acute Eye Irritation / Corrosion)

Principles of method if other than guideline:

NA

GLP compliance:

yes

Species:

rabbit

Strain:

other: New Zealand White: Hy/Cr

Details on test animals or tissues and environmental conditions:

TEST ANIMALS
- Source: Charles River France (76410 Saint Aubin les Elbeuf, france)
- Age at study initiation: no data
- Weight at study initiation: 2.4 kg +/- 0.1 kg
- Housing: individually in polystyrene cage (35.0 x 55.0 x 32.0 cm)
- Diet: rabbit diet SQC (Special diets Services Ltd, Witham, Essex, England), ad libitum
- Water: filtered water with 0.22 µm Millipore membrane (Millipore, 67120 Molsheim, France), ad libitum
- Acclimation period: 8 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 20°C +/- 3°C
- Humidity (%): 50 % +/- 20 %
- Air changes (per hr): no data (filtered air)
- Photoperiod (hrs dark / hrs light): 12 hrs dark / 12 hrs light

IN-LIFE DATES: From: 1984-05-18 To: 1984-05-20

Vehicle:

unchanged (no vehicle)

Controls:

other: right eye

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 0.1 ml

Duration of treatment / exposure:

not rinsed

Observation period (in vivo):

3 days

Number of animals or in vitro replicates:

6

Details on study design:

REMOVAL OF TEST SUBSTANCE: not rinsed

SCORING SYSTEM: similar to grading of ocular lesion described in 405 OECD guideline.

Other effects / acceptance of results:

NA

Irritation parameter:

chemosis score

Basis:

mean

Time point:

other: 24, 48, 72 h

Score:

0

Max. score:

4

Remarks on result:

other: no effect

Irritation parameter:

conjunctivae score

Basis:

mean

Time point:

other: 24, 48, 72h

Score:

0.16

Max. score:

3

Reversibility:

fully reversible within: 1 day

Irritation parameter:

iris score

Basis:

mean

Time point:

other: 24, 48, 72h

Score:

0

Max. score:

2

Remarks on result:

other: no effect

Irritation parameter:

cornea opacity score

Basis:

mean

Time point:

other: 24, 48, 72h

Score:

0

Max. score:

4

Remarks on result:

other: no effect

Irritant / corrosive response data:

Conjunctivae effects were observed 1 hour after exposure. Slight chemosis and slight conjunctivae were observed in two animals and four animals, respectively. Two animals presented conjunctivae with diffuse, crimson colour and individual vessels not easily discernible. These effects were fully reversible within 1 day.

Other effects:

No data

Table 1: Irritant/corrosive response data for each animal at each observation time up to removal of each animal from the test

Score at time point/ Reversibility	Cornea Max. score: 4	Iris Max. score: 2	Conjunctivae Max. score: 3	Chemosis Max. score: 4
60 min	0/0/0/0/0/0	0/0/0/0/0/0	2/1/1/1/1/2	0/0/0/1/1/0
24 h	0/0/0/0/0/0	0/0/0/0/0/0	1/0/0/1/0/1	0/0/0/0/0/0
48 h	0/0/0/0/0/0	0/0/0/0/0/0	0/0/0/0/0/0	0/0/0/0/0/0
72 h	0/0/0/0/0/0	0/0/0/0/0/0	0/0/0/0/0/0	0/0/0/0/0/0
Average 24h, 48h, 72h	0	0	0.16	0
Reversibility*)	-	-	c.	c.

*) Reversibility: c.=completely reversible; n.c.= not completely reversible; n= not reversible

Interpretation of results:

slightly irritating

Remarks:

Migrated information Criteria used for interpretation of results: other: EU-GHS

Conclusions:

Metiloil A was not considered to be an eye irritant.

Executive summary:

In a primary eye irritation study (Kaysen A., 1984), 0.1 ml of Metiloil A (batch No. 1169) was instilled into the conjonctival sac of 6 New Zealand white male rabbits. Animals then were observed for 3 days. Slight irritation was observed one hour after treatment. Slight chemosis and slight conjunctivae were observed in two animals and four animals, respectively. Two animals presented conjunctivae with diffuse, crimson colour and individual vessels not easily discernible. Effects were reversible within one day. In this study, Metiloil A was not considered as an eye irritant based on EU-GHS.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Respiratory irritation

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

Based on GLP studies on the read-cross substance (CAS No 67762 -38 -3), the target substance Fatty acids, C18 (saturated and unsaturated) ethyl esters is not considered either a skin nor an eye irritant. In support for evaluation of eye irritation of Fatty acids, C18 (saturated and unsaturated) ethyl esters, no in vivo irritation potential was identified using the Hen's Egg Test utilizing the Chorioallantoic Membrane (HET-CAM). In terms of skin irritation, no skin irritation was seen in a human patch repeated insult patch test (HRIPT) using Bioester XP 3511F (atty acids, C18 (saturated and unsaturated) ethyl esters).

Justification for selection of skin irritation / corrosion endpoint:

GLP study on read-cross substance (CAS No 67762-38-3)

Justification for selection of eye irritation endpoint:

GLP study on read-cross substance (CAS No 67762-38-3)

Justification for classification or non-classification

Not classified. The test data shows that the target substance Fatty acids, C18 (saturated and unsaturated) ethyl ester is not considered to be a skin or eye irritant.