Reaction mass of 3,5-dimethylcyclohex-3-ene-1-carbaldehyde and 2,4-dimethylcyclohex-3-ene-1-carbaldehyde

Endpoint summary

Description of key information

Skin irritation: Irritating (Weight of evidence)
Serious eye damage/eye irritation: Not irritating

Key value for chemical safety assessment

Skin irritation / corrosion

Link to relevant study records

Reference

Reference 1

Endpoint:

skin irritation / corrosion, other

Remarks:

in vivo

Type of information:

experimental study

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: OECD 404 and GLP compliance study (from ECETOC TR 066 statment)

Qualifier:

according to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

GLP compliance:

yes

Species:

rabbit

Strain:

other: unspecified

Type of coverage:

semiocclusive

Preparation of test site:

other: flank

Vehicle:

other: undiluted

Controls:

no

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit):0.5mL
- Concentration (if solution): undiluted

Duration of treatment / exposure:

4 hours

Observation period:

1 hour, 1 day, 2 day, 3 day and 7 days

Number of animals:

4 animals

Irritation parameter:

erythema score

Basis:

animal: 1, 3 and 4 (individual mean)

Time point:

other: 24 hr, 48 hr and 72 hr

Score:

2

Max. score:

2

Irritation parameter:

erythema score

Basis:

animal #2

Time point:

other: 24 hr, 48 hr and 72 hr

Score:

2.2

Max. score:

2.5

Irritation parameter:

edema score

Basis:

animal #1

Time point:

other: 24 hr, 48 hr and 72 hr

Score:

0.83

Max. score:

1

Irritation parameter:

edema score

Basis:

animal: 2 and 3 (individual mean)

Time point:

other: 24 hr, 48 hr and 72 hr

Score:

1.2

Irritation parameter:

edema score

Basis:

animal #4

Time point:

other: 24 hr, 48 hr and 72 hr

Score:

1.5

Max. score:

2

Other effects:

Desquamation from the skin was observed in 2/4 animals at the 7 day timepoint.

Table. 2 The observed results of skin irritation

		Observation interval (days)
Animal No.	1	1hr	1d	2d	3d	7d
Erythema		2	2	2	2	1
Oedema		0	1	1	0.5	0
Observations						De*
Animal No.	2
Erythema		1	2	2	2.5	1.5
Oedema		2	1	1.5	1	0.5
Animal No.	3
Erythema		2	2	2	2	1.5
Oedema		2	1.5	1	1	0.5
Animal No.	4
Erythema		2	2	2	2	2
Oedema		2	2	1.5	1	0.5
Observations						De*
De*= Marked desquamation from the skin
PRIMARY IRRITATION INDEX = (SUM ERYTHEMA 24/48/72 hr + SUM OEDEMA 24/48/72 hr)/(3*No. Of animals) = 3.21

Interpretation of results:

Category 2 (irritant) based on GHS criteria

Conclusions:

The test substanceTrigustral was irritating to the skin of rabbits.

Executive summary:

In a skin irritation study (ECETOC Technical Report No.066), 4 rabbits were dermally exposed (semi-occlusive) to 0.5 mL of undiluted Trigustral for 4 hrs. Animals were observed for 1 hr, 24 hr, 48 hr, 72 hr and 7 days after patch removal. Erythema and edema were scored using the grading scale for skin irritation effects noted in Table 1.

 

The test substance caused well defined erythema in all treated animals (mean score: 2 – 2.2), slight oedema (mean score:1 - 2 ) in 3/4 rabbits and very slight oedema (mean score: 0 - 1) in 1/4 rabbit. The odema in 1 rabbit was fully reversible on Day 7 while 3/4 animals had very slight oedema remaining (max score:0.5) at Day 7. All animals had erythema still present by Day 7 (max score:2). Desquamation from the skin was observed in 2/4 animals at the 7 day timepoint.

 

Trigustral is a skin irritant based on the results of this OECD 404 skin irritation/corrosion study.

Reference 2

Endpoint:

skin irritation / corrosion, other

Remarks:

in vivo

Type of information:

experimental study

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Comparing to guidelines/standards, basic data is given.

Qualifier:

according to guideline

Guideline:

other: no data (see comments)

Principles of method if other than guideline:

comments: In this skin irritation study, no details test guideline was presented. However, it is indicated that 10 animals (unspecified sex) per dose and only one dose levels: 5000 mg/kg. The results included redness and edema effects and necropsy observations.

GLP compliance:

not specified

Species:

rabbit

Strain:

not specified

Type of coverage:

not specified

Preparation of test site:

not specified

Vehicle:

not specified

Controls:

no

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 5000 mg/kg

Number of animals:

10 animals

Irritation parameter:

other: redness

Basis:

animal: 1/8

Remarks on result:

other: Moderate redness

Irritation parameter:

other: redness

Basis:

animal: 7/8

Remarks on result:

other: Servere redness

Irritation parameter:

edema score

Basis:

animal: 4/8

Remarks on result:

other: Moderate edema

Irritation parameter:

edema score

Basis:

animal: 4/8

Remarks on result:

other: Severe edema

Table 1. Necropsy observation

Doses (mg/kg)	5000
Skin, sloughing of exposure area	1
Skin edema	8
Skin redness	9
Skin, hard/thick	6

Interpretation of results:

Category 2 (irritant) based on GHS criteria

Conclusions:

The test substance Trigustral was irritating to the skin of rabbits.

Executive summary:

In a dermal toxicity study (1699 02/03), a 5000 mg/kg bw dose of Trigustral was applied to the skin of 10 rabbits. Irritation was assessed according to the following irritation parameters: skin redness, skin oedema, skin sloughing of exposure area and skin (hard/thickness).

 

On Day 1, two animals died. The number of rabbits showing skin irritation was: 1/8 moderate redness, 7/8 severe redness; 4/8 moderate oedema, 4/8 severe oedema. The following observations were noted during necropsy of all animals: skin sloughing of exposure area, 1/10; skin oedema, 7/8, skin redness, 9/10, and skin hard/thicknes, 6/10.

 

In this study, Trigustral is a skin irritant.

Reference 3

Endpoint:

skin irritation / corrosion, other

Remarks:

in vivo

Type of information:

experimental study

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: GLP compliant study, but not standard skin irritation under OECD Guideline.

Qualifier:

according to guideline

Guideline:

other: OECD Guidline 406 (skin sensitisation)

GLP compliance:

yes

Species:

guinea pig

Strain:

other: albino Dunkin Hartley guinea pig

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: David Hall Limited, Burton-on-Trent, Staffordshire, UK
- Age at study initiation: approximately eight to twelve weeks old
- Weight at study initiation: 300 to 345g
- Housing: housed singly or in pairs in solid-floor polypropylene cages furnished with woodflakes
- Diet (e.g. ad libitum): free access
- Water (e.g. ad libitum): free access
- Acclimation period: at least five days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 20 to 22 °C
- Humidity (%): 34 to 60%
- Air changes (per hr): approximately fifteen changes per hour
- Photoperiod (hrs dark / hrs light): twelve hours continuous light and twelve hours darkness

Type of coverage:

occlusive

Preparation of test site:

clipped

Vehicle:

other: ethanol/diethylphthalate 1:1

Controls:

yes, concurrent vehicle

Amount / concentration applied:

Topical Challenge in main study: 50% and 25% v/v in ethanol/diethylphthalate 1:1

Duration of treatment / exposure:

24h

Observation period:

24 and 48 hours

Number of animals:

Test group: 20 guinea pigs
Control group: 10 guinea pigs

Irritation parameter:

erythema score

Basis:

animal: 1-20

Time point:

other: 24hr

Score:

>= 1 - <= 2

Max. score:

3

Remarks on result:

other: 25% v/v in ethanol/diethylphthalate 1:1

Irritation parameter:

erythema score

Basis:

animal: 1-20

Time point:

other: 48hr

Score:

>= 1 - <= 2

Max. score:

2

Remarks on result:

other: 25% v/v in ethanol/diethylphthalate 1:1

Irritation parameter:

edema score

Basis:

animal: 1-20

Time point:

other: 24hr

Score:

>= 1 - <= 2

Max. score:

3

Remarks on result:

other: 25% v/v in ethanol/diethylphthalate 1:1

Irritation parameter:

edema score

Basis:

animal: 1-20

Time point:

other: 48 hr

Score:

> 1 - <= 2

Max. score:

2

Remarks on result:

other: 25% v/v in ethanol/diethylphthalate 1:1

Irritation parameter:

erythema score

Basis:

animal: 1-20

Time point:

other: 24 hr

Score:

>= 1 - <= 2

Max. score:

3

Remarks on result:

other: 50% v/v in ethanol/diethylphthalate 1:1

Irritation parameter:

erythema score

Basis:

animal: 1-20

Time point:

other: 48 hr

Score:

>= 1 - <= 2

Max. score:

2

Remarks on result:

other: 50% v/v in ethanol/diethylphthalate 1:1

Irritation parameter:

edema score

Basis:

animal: 1-20

Time point:

other: 24hr

Score:

>= 1 - <= 2

Max. score:

3

Remarks on result:

other: 50% v/v in ethanol/diethylphthalate 1:1

Irritation parameter:

edema score

Basis:

animal: 1-20

Time point:

other: 48 hr

Score:

>= 1 - <= 2

Max. score:

2

Remarks on result:

other: 50% v/v in ethanol/diethylphthalate 1:1

Irritation parameter:

other: erythema score and edema score

Basis:

mean

Time point:

other: 24 and 48 hr

Score:

0

Remarks on result:

other: Control animal; ethanol/diethylphthalate 1:1

Interpretation of results:

Category 2 (irritant) based on GHS criteria

Conclusions:

The substance Trigustral was irritating in the skin of guinea pigs.

Executive summary:

In a skin sensitization study (012/251), Trigustral (25% and 50% v/v in ethanol/diethylphthalate 1:1) was applied to flanks of female albino Dunkin Hartley guinea pigs (occlusive exposure) for 24hr (after intradermal induction and topical induction (14 days). The degree of erythema and odema was evaluated after 24 and 48 hrs.

 

The test substance led to mild to moderate skin irritation (mean score: 1 - 2) in most animals. Some treated animals had adverse reactions that prevented accurate evaluation of erythema and oedema at the 48 hr observation period. There were other observation notes in small superficial scattered scab, desquamation, etc.The control animals did not have skin irritation during the observation period.

 

In this study, Trigustral is a skin irritant based on the results of the challenge test in a skin sensitasation study.

Endpoint conclusion

Endpoint conclusion:

adverse effect observed (irritating)

Eye irritation

Link to relevant study records

Reference

Endpoint:

eye irritation, other

Remarks:

in vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

25-05-1981 to 02-07-1981

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Study report which followed a known protocol (FDA/ Draize Method); acceptable restrictions.

Qualifier:

according to guideline

Guideline:

other: FDA of the United States (fed, reg, 28 (119), 5582, 1963)/ Draize and Kelley (Drug Cosmet, Industr, 71(1952) 36)

Principles of method if other than guideline:

In general the techniques of tests as published by the FDA of the United States (Fed. Reg. 28 (119), 5582, 1963) and Draize and Kelley (Drug Cosmet. Induster. 71 (1952) 36) are followed.

Six New Zealand White albino rabbits are used for each test substance. The animals are caged individually and received no hay or other extraneous material that might enter the eyes.

The eyes of the animals are examined before testing and only those animals without observable eye defects and used. One tenth of a milliliter of the test substance, or in the case of solids or aemisolids, 100 milligrams of the test substance, is allowed to fall on the everted lower lid of one eye of each rabbit; the upper and lower eye lid are then carefully closed and subsequently held together for at least one second before releasing, to prevent loss of material. The other eye, remaining untreated, serves as a control.

The eyes are not washed following instillation and the animals are released immediately.

An animal is considered as giving a positive reaction if there is, at any of the readings, discernible opacity of the cornea (other than a slight dulling of the normal lustre), or ulceration of the cornea, or inflammation of the iris (other than a slight deeping of the folds (rugae) or a slight circumcorneal injection), or if such substance produces in the conjunctivae (palpebral and bulbar, excluding the cornea and iris) an obvious swelling with partial eversion of the lids, or a diffuse deep-crimson red with individual vessels not easily discernible. The FDA-scoring scale is used.

The test is considered positive if four or more of the animals in the test group of six rabbits exhibit a positive reaction. If one animal exhibits a positive reaction, the test is regarded as negative.

If two or three animals exhibit a postive reaction, the test is repeated, using a different group of six animals. The second test is considered as positive if three or more of the animals exhibit a positive reaction. If only one or two animals in the second test exhibit a positive reaction, the test is again repeated with a different group of six animals. Should be a third test be needed, the substance will be regarded as irritant if two or more animals exhibit a positive response.

GLP compliance:

not specified

Species:

rabbit

Strain:

other: New Zealand White albino rabbit

Vehicle:

unchanged (no vehicle)

Controls:

yes, concurrent no treatment

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): one tenth of a milliliter

Duration of treatment / exposure:

The treated eyes are not washed following instillation.

Observation period (in vivo):

24, 48, 72 hours and 7 days

Number of animals or in vitro replicates:

6 animals and unspecified sex

Details on study design:

REMOVAL OF TEST SUBSTANCE
- Washing (if done): No

SCORING SYSTEM: The method for grading ocular lesions is presented in Table 1 below.

Irritation parameter:

cornea opacity score

Basis:

animal: 1, 4 (individual mean)

Time point:

other: 24 h, 48h, 72h

Score:

0.67

Max. score:

1

Irritation parameter:

cornea opacity score

Basis:

animal: 2, 3, 5 (individual mean)

Time point:

other: 24h, 48 h, 72h

Score:

1

Max. score:

1

Irritation parameter:

cornea opacity score

Basis:

animal #6

Time point:

other: 24h, 48h, 72h

Score:

0

Max. score:

0

Irritation parameter:

iris score

Basis:

animal: 1, 2, 6 (individual mean)

Time point:

other: 24h, 48h, 72h

Score:

0.33

Max. score:

1

Irritation parameter:

iris score

Basis:

animal #3

Time point:

other: 24h, 48h, 72h

Score:

1

Max. score:

1

Irritation parameter:

iris score

Basis:

animal #4

Time point:

other: 24h, 48h, 72h

Score:

0

Max. score:

0

Irritation parameter:

iris score

Basis:

animal #5

Time point:

other: 24h, 48h, 72h

Score:

0.67

Max. score:

1

Irritation parameter:

conjunctivae score

Remarks:

redness

Basis:

animal: 1, 2, 6 (individual mean)

Time point:

other: 24h, 48h, 72h

Score:

1.67

Max. score:

2

Irritation parameter:

conjunctivae score

Remarks:

redness

Basis:

animal #3

Time point:

other: 24h, 48h, 72h

Score:

2.33

Max. score:

3

Irritation parameter:

conjunctivae score

Remarks:

redness

Basis:

animal: 4, 5 (individual mean)

Time point:

other: 24h, 48h, 72h

Score:

2

Max. score:

2

Irritation parameter:

chemosis score

Basis:

animal: 1, 5 (individual mean)

Time point:

other: 24h, 48h, 72h

Score:

1.67

Max. score:

2

Irritation parameter:

chemosis score

Basis:

animal #2

Time point:

other: 24h, 48h, 72h

Score:

2

Max. score:

3

Irritation parameter:

chemosis score

Basis:

animal #3

Time point:

other: 24h, 48h, 72h

Score:

2.33

Max. score:

3

Irritation parameter:

chemosis score

Basis:

animal #4

Time point:

other: 24h, 48h, 72h

Score:

1.67

Max. score:

3

Irritation parameter:

chemosis score

Basis:

animal #6

Time point:

other: 24h, 48h, 72h

Score:

1.33

Max. score:

2

Table 2: Individual scores awarded to the ocular lesions elicited by Ligustral Rabbit number Score cornea iris Conjunctivae  redness chemosis  After 24 hours 1 1 1 2  2  2 1  1  2  3  3 1  1  2  3  4 1  0 2  3  5  1  1  2  2  6  0  0  2  2  After 48 hours 1 1  0  2  2  2  1  0  2  2  3  1  1  3  2  4  1  0  2  1  5  1  1  2  2  6  0  1  2  2  After 72 hours 1 0  0  1  1  2 1 0 1 1  3  1  1  2  2  4  0  0  2  1  5  1  0  2  1  6  0  0  1  0  After 7 days 1 0  0  0  0  2  0  0  1  0  3  1  1  2  1  4  0  0  0  0  5 0 0 1  0  6  0 0 0 0

 

Interpretation of results:

GHS criteria not met

Conclusions:

According to the FDA-standards, undiluted Trigustral is considered to be an eye irritant.

Executive summary:

In a primary eye irritation study (V81.203), 0.1 mL of undiluted Trigustral was instilled into the eye lid of one eye of a New Zealand White albino rabbit (6 animals). The eye was not washed after instillation of the test article. Animals then were observed for 24 hr, 48 hr, 72 hr and 7 days after dosing. Irritation was scored using the system noted in Table 1.

 

The test substance caused slight corneal opacity in 5/6 rabbits, generally involving 50 -75% of the cornea, slight iritis also in 5/6 rabbits and moderate to severe redness and/or swelling of the conjunctivae in all animals. In addition five rabbits (no.1 through 5) showed moderate discharge of eye fluid. In the course of the seven-day observation period recovery of these lesions was observed but at the 7 -day reading one animal still showed slight corneal opacity, slight iritis and moderate conjunctivitis while two other animals showed slight redness of the conjunctivae.

 

In this study, Trigustral is an eye irritant based on the results of this test study according to FDA standards.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Respiratory irritation

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

Skin irritation/corrosion

A skin irritation study, a skin sensitization study and a dermal toxicity study were applied as weight of evidence. 

 

In a skin irritation study, 4 rabbits were dermally exposed (semi-occlusive) to 0.5 mL of undiluted Trigustral for 4 hrs. Animals were observed for 1hr, 24hr, 48hr, 72hr and 7 days after patch removal. The test substance caused well defined erythema in all treated animals (mean score: 2 – 2.2), slight oedema (mean score:1 - 2 ) in 3/4 rabbits and very slight oedema (mean score: 0 - 1) in 1/4 rabbit. The odema in 1 rabbit was fully reversible on Day 7 while 3/4 animals had very slight oedema remaining (max score:0.5) at Day 7. All animals had erythema still present by Day 7 (max score:2). Desquamation from the skin was observed in 2/4 animals at the 7 day time point.

 

In a skin sensitization study (OECD 406, GLP), Trigustral (25% and 50% v/v in ethanol/diethylphthalate 1:1) was applied to flanks of female albino Dunkin Hartley guinea pigs (occlusive exposure) for 24hr (after intradermal induction and topical induction (14 days). The degree of erythema and odema was evaluated after 24 and 48 hrs. The test substance led to mild to moderate skin irritation (mean score: 1 - 2) in most animals. Some treated animals had adverse reactions that prevented accurate evaluation of erythema and oedema at the 48 hr observation period. The control animals did not have skin irritation during the observation period.

 

In a dermal toxicity study, a 5000 mg/kg bw dose of Trigustral was applied to the skin of 10 rabbits. On Day 1, two animals died. Irritation was assessed according to the following irritation parameters: skin redness, skin oedema, skin sloughing of exposure area and skin (hard/thickness). The number of rabbits showing skin irritation was: 1/8 moderate redness, 7/8 severe redness; 4/8 moderate oedema, 4/8 severe oedema. The following observations were noted during necropsy of all animals: skin sloughing of exposure area, 1/10; skin oedema, 7/8, skin redness, 9/10, and skin hard/thickness, 6/10. The LD 50 was > 5000 mg/kg bw.

 

Taking into account all of these studies as weight of evidence, Trigustral is a skin irritant. The results from this study are acceptable to use in the human health risk assessment.

 

Serious eye damage/eye irritation

An in vitro eye irritation study was not required as an in vivo study was available.

 

In a primary eye irritation study, 0.1 mL of undiluted Trigustral was instilled into the eye lid of one eye of a New Zealand White albino rabbit (6 animals). The eye was not washed after instillation of the test article. Animals then were observed for 24 hr, 48 hr, 72 hr and 7 days after dosing..

The test substance caused slight corneal opacity in 5/6 rabbits, generally involving 50 -75% of the cornea, slight iritis also in 5/6 rabbits and moderate to severe redness and/or swelling of the conjunctivae in all animals. In addition five rabbits (no.1 through 5) showed moderate discharge of eye fluid. In the course of the seven-day observation period recovery of these lesions was observed but at the 7 -day reading one animal still showed slight corneal opacity, slight iritis and moderate conjunctivitis while two other animals showed slight redness of the conjunctivae.

 

The following mean values, based on the results from the 24, 48 and 72 hour readings,were calculated:

 cornea opacity: 3/6 animals 1; 2/6 animals 0.67; 1/6 animal 0

iris lesion: 1/6 animal 1; 1/6 animal 0.67; 3/6 animals 0.33; 1/6 animal 0.

conjunctival redness: 1/6 animal 2.33; 2/6 animals 2; 3/6 animals 1.67;

conjunctival oedema (chemosis): 1/6 animal 2.33; 1/6 animal 2; 3/6 animals 1.67; 1/6 animal 1.33.

 

In the study, Trigustral is an eye irritant, according to FDA standards. As this study was conducted according to an older test method and six rabbits were used, the CLP regulation does not provide criteria for the evaluation of such studies. The current UNSCEGHS Guidance (adopted in June 2011) were considered as indicated in ‘Guidance on the application of the CLP criteria’, version 5.0, 2017:
.

Classification as serious eye damage – Category 1 if at least in one animal effects on the cornea, iris or conjunctiva that are not expected to reverse or have not fully reversed within an observation period of normally 21 days; and/or at least 4 out of 6 rabbits show a mean score of:

≥ 3 for the cornea and/or

≥1.5 for the iris;

Classification as eye irritation – Category 2 if at least 4 out of 6 rabbits show a mean score of:

≥1 for the cornea and/or

≥1 for the iris and/or

≥2 conjunctival erythema and/or

≥2 conjunctival swelling.

 

 Based on these criteria, Trigustral is not an eye irritant. The results from this study are acceptable to use in the human health risk assessment.

Justification for classification or non-classification

Based on the available information in the dossier, the substance Trigustral (EC No. 943-728-2) is classified as a skin irritant (Category 2) and does not need to be classified for serious eye damage/eye irritation when considering the criteria outlined in Annex I of 1272/2008/EC.