Reaction mass of: N,N'-[1,3-Phenylenebis(methylene)bis[12-hydroxyoctadecanamide], N,N'-hexane-1,6-diylbis(12-hydroxyoctadecanamide) and N,N'-ethane-1,2-diylbis(12-hydroxyoctadecan-1-amide)

Endpoint summary

Description of key information

The substance consists of three structurally similar bisamides: N,N'-ethane-1,2-diylbis(12-hydroxyoctadecanamide), N,N'-hexane-1,6-diylbis(12-hydroxyoctadecanamide) and N,N'-[1,3-phenylenebis(methylene)]bis(12-hydroxyoctadecanamide). Experimental data on this substance are not available. The individual constituents and mixtures of them and similar amides are considered suitable read-across substances. In guideline studies on three read-across substances, 12-hydroxyoctadecanoic acid, reaction products with 1,3-benzenedimethanamine and hexamethylenediamine, N,N'-ethane-1,2-diylbis(12-hydroxyoctadecanamide) and 1,3-bis[12-hydroxy-octadecamide-N-methylene]-benzene, no skin or eye irritation/corrosion was observed. Due to the high structural similarity of the three-constituent substance to these read-across substances comparable behaviour is expected. Predictions on eye and skin irritation/corrosion of the individual constituents by the (Q)SAR software tool ChemProp 6.7 yielded negative results.

Key value for chemical safety assessment

Skin irritation / corrosion

Link to relevant study records

Reference

Reference 1

Endpoint:

skin irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 439 (In Vitro Skin Irritation: Reconstructed Human Epidermis Test Method)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test system:

human skin model

Source species:

human

Cell type:

other: epidermal keratinocytes which have been cultured to form a multi-layered, highly differentiated model of the human epidermis

Vehicle:

unchanged (no vehicle)

Details on test system:

The test system is a commercially available EpiDermTM-Kit, procured by MatTek. The EpiDermTM tissue consists of human-derived epidermal keratinocytes which have been cultured to form a multi-layered, highly differentiated model of the human epidermis. It consists of organized basal, spinous and granular layers, and a multi-layered stratum corneum containing intercellular lamellar lipid layers representing main lipid classes analogous to those found in vivo. The EpiDermTM tissues are cultured on specially prepared cell culture inserts.
Origin .
EpiDermTM tissues were procured from MatTek In Vitro Life Science Laboratories, Bratislava.
Designation of the kit: EPI-200-SIT
Day of delivery: 15. Jan. 2019
Batch no.: 28679

Control samples:

yes, concurrent negative control

yes, concurrent positive control

Amount/concentration applied:

1: 24.9 mg
2: 26.0 mg
3: 25.3 mg

Duration of treatment / exposure:

1 hour

Duration of post-treatment incubation (if applicable):

23 hours and 30 minutes

Number of replicates:

3 replicates

Irritation / corrosion parameter:

% tissue viability

Run / experiment:

1

Value:

86.7

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

no indication of irritation

Irritation / corrosion parameter:

% tissue viability

Run / experiment:

2

Value:

93.1

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

no indication of irritation

Irritation / corrosion parameter:

% tissue viability

Run / experiment:

3

Value:

97.9

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

no indication of irritation

Other effects / acceptance of results:

All validity criteria are met. Positive and negative controls are within the range of historical data of the test facility. Therefore, the experiment is considered valid.

Interpretation of results:

GHS criteria not met

Conclusions:

All validity criteria are fulfilled. The study can be considered valid. Under the conditions of the test, Bisamid is considered non-irritant to skin.

Executive summary:

One valid experiment was performed. Three tissues of the human skin model EpiDermTM were treated with the test item for 60 minutes. The test item was applied directly to each tissue and spread to match the tissue size (0.63 cm2; as indicated by the supplier). DPBS-buffer was used as negative control and 5% SDS solution was used as positive control. After treatment with the negative control, the mean absorbance value was within the required acceptability criterion of 0.8 ≤ mean OD ≤ 2.8, OD was 1.6. The positive control showed clear irritating effects. The mean value of relative tissue viability was reduced to 2.6% (required: ≤ 20%). The variation within the tissue replicates of negative control, positive control and test item was acceptable (required: ≤ 18%). After the treatment with the test item, the mean value of relative tissue viability was reduced to 92.6%. This value is above the threshold for skin irritation potential (50%). Test items that induce values above the threshold of 50% are considered non-irritant to skin. Therefore, the test item Bisamid is considered non-irritant to skin in the Reconstructed human Epidermis (RhE) Test Method.

Reference 2

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

92/69/EEC, B4

GLP compliance:

yes

Species:

rabbit

Strain:

not specified

Type of coverage:

semiocclusive

Vehicle:

other: distilled water

Amount / concentration applied:

500 mg

Duration of treatment / exposure:

4 h

Number of animals:

3

Irritation parameter:

erythema score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0

Irritation parameter:

erythema score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Irritation parameter:

erythema score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0

Irritation parameter:

erythema score

Max. score:

0

Remarks on result:

other: other: Max. duration: d; Max. value at end of observation period: 0 (related to all animals)

Irritation parameter:

edema score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0

Irritation parameter:

edema score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Irritation parameter:

edema score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0

Irritation parameter:

edema score

Max. score:

0

Remarks on result:

other: other: Max. duration: d; Max. value at end of observation period: 0 (related to all animals)

Other effects:

None.

Interpretation of results:

GHS criteria not met

Conclusions:

1,3-bis[12-hydroxy-octadecamide-N-methylene]-benzene is shown not to be irritating/corrosive to the skin of rabbits.

Executive summary:

The guideline study on skin irritation/corrosion of 1,3-bis[12-hydroxy-octadecamide-N-methylene]-benzene was conducted according to EU Method B.4 using rabbits. The study reports that the application of 500 mg of the test substance (semiocclusive coverage) with a residence time of 4 h does not result in edema and erythema. Consequently, the GHS classification criteria for skin irritation/corrosion are not met.

Reference 3

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

other: Annex V

GLP compliance:

yes

Species:

rabbit

Strain:

New Zealand White

Type of coverage:

semiocclusive

Vehicle:

other: Administered as supplied

Amount / concentration applied:

500 mg

Duration of treatment / exposure:

4 h

Number of animals:

3

Irritation parameter:

erythema score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0

Irritation parameter:

erythema score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Irritation parameter:

erythema score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0.33

Irritation parameter:

erythema score

Max. score:

2

Remarks on result:

other: Max. duration: 48 d; Max. value at end of observation period: 0 (related to all animals)

Irritation parameter:

edema score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0

Irritation parameter:

edema score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Irritation parameter:

edema score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0

Irritation parameter:

edema score

Max. score:

1

Remarks on result:

other: Max. duration: 24 d; Max. value at end of observation period: 0 (related to all animals)

Irritant / corrosive response data:

Reversibility of any observed effect: Changes fully reversible within 2 days

Other effects:

No signs of toxicity or ill health were observed in any test animal.

Interpretation of results:

GHS criteria not met

Conclusions:

12-hydroxyoctadecanoic acid, reaction products with 1,3-benzenedimethanamine and hexamethylenediamine is shown not to be irritating/corrosive to the skin of New Zealand White rabbits.

Executive summary:

The guideline study on skin irritation/corrosion of 12-hydroxyoctadecanoic acid, reaction products with 1,3-benzenedimethanamine and hexamethyl enediamine was conducted according to Annex V using New Zealand White rabbits. The study reports that the application of 500 mg of the test substance (semiocclusive coverage) with a residence time of 4 h does not result in edema. For one test animal an erythema score of 0.33 is reported. For the remaining test animals, the application does not result in erythema. Conclusively, the GHS classification criteria for skin irritation/corrosion are not met.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Eye irritation

Link to relevant study records

Reference

Reference 1

Endpoint:

eye irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

11 . Jan. 2019 - 21. Feb. 2019

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 492 (Reconstructed Human Cornea-like Epithelium (RhCE) Test Method for Identifying Chemicals Not Requiring Classification and Labelling for Eye Irritation or Serious Eye Damage)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Vehicle:

unchanged (no vehicle)

Controls:

yes, concurrent positive control

yes, concurrent negative control

Amount / concentration applied:

Tissue 1: 52.8 mg
Tissue 2: 50.0 mg

Duration of treatment / exposure:

6 hours

Duration of post- treatment incubation (in vitro):

18 hours and 15 minutes

Number of animals or in vitro replicates:

2 replicates

Details on study design:

On the day of the start of the experiment, the MTT concentrate was thawed. The MTT concentrate was diluted with assay medium directly before use. The assay medium was warmed in the water bath to 37 ± 1°C. 6-well-plates were labelled with test item, negative control and positive control and filled with 1 mL assay medium in the appropriate wells. All inserts were inspected for viability and the presence of air bubbles between agarose gel and insert. Viable tissues were transferred in the prepared 6-well-plate and incubated at 37 ± 1 °C, 5 ± 1 % CO2 and ≥ 95% relative humidity for 1 hour. After the pre-incubation, the medium was replaced and the wells were filled with 1 mL fresh assay medium. All 6-well-plates were incubated at 37 ± 1 °C, 5 ± 1 % CO2 and ≥ 95% relative humidity for 16 hours and 29 minutes. 7.2.2 Exposure and Post-Treatment After overnight incubation, the tissues were pre-wetted with 20 μL DPBS buffer and the tissues were incubated at 37 ± 1 °C, 5 ± 1 % CO2 and ≥ 95% relative humidity for 29 minutes. After that, 50 μL of the controls and a defined amount of the test item were applied in duplicate in one- minute- intervals. At the beginning of each experiment (application of negative controls), a stop watch was started. After dosing the last tissue, all plates were transferred into the incubator for 6 hours at 37 ± 1 °C, 5 ± 1 % CO2 and ≥ 95% relative humidity. At the end of exposure time, the inserts were removed from the plates in one-minute-intervals using sterile forceps and rinsed immediately. The inserts were thoroughly rinsed with DPBS. Then, the tissues were immediately transferred into 5 mL of assay medium in pre-labelled 12-well plate for 24 minutes post soak at room temperature. After that, each insert was blotted on absorbent material and transferred into a pre-labelled 6-well plate, containing 1 mL assay medium. For post-treatment incubation, the tissues were incubated for 18 hours and 15 minutes at 37 ± 1 °C, 5 ± 1 % CO2 and ≥ 95% relative humidity. After the post-treatment incubation, the MTT assay was performed.

Irritation parameter:

other: Tissue Viability

Remarks:

in % of the negative control

Run / experiment:

1

Value:

104.9

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

no indication of irritation

Irritation parameter:

other: Tissue Viability

Remarks:

in % of the negative control

Run / experiment:

2

Value:

105

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

no indication of irritation

Other effects / acceptance of results:

All validity criteria are met. Positive and negative controls are within the range of historical data of the test facility. Therefore, the experiment is considered valid.

Interpretation of results:

GHS criteria not met

Conclusions:

All validity criteria are fulfilled. The study can be considered valid. Under the conditions of the test, Bisamid is considered non-eye irritant in the EpiOcularTM Eye Irritation Test.

Executive summary:

One valid experiment was performed. The test item Bisamid was applied to a three-dimensional human cornea tissue model in duplicate for an exposure time of 6 hours. After treatment, the respective substance was rinsed from the tissue; then, cell viability of the tissues was evaluated by addition of MTT, which can be reduced to formazan. The formazan production was evaluated by measuring the optical density (OD) of the resulting solution. Demineralised water was used as negative control and methyl acetate was used as positive control. The controls showed the following results: After treatment with the negative control, the absorbance values were within the required acceptability criterion of mean OD > 0.8 and < 2.5, OD was 1.7. The positive control showed clear eye irritating effects, the mean value of the relative tissue viability was 30.1% (< 50%). The variation within tissue replicates of the controls and the test item was acceptable (< 20%). After treatment with the test item, the mean value of relative tissue viability was 104.9 %. This value is well above the threshold for eye irritation potential (≤ 60%). Test items that induce values above the threshold are considered non-eye irritant. Under the conditions of the test, Bisamid is considered non-eye irritant in the Epi-OcularTM Eye Irritation Test.

Reference 2

Endpoint:

eye irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method B.5 (Acute Toxicity: Eye Irritation / Corrosion)

Version / remarks:

EEC Directive 92/32/EEC, B5

GLP compliance:

yes

Specific details on test material used for the study:

Nature of substance: powder

Species:

rabbit

Strain:

not specified

Vehicle:

not specified

Amount / concentration applied:

45 mg

Number of animals or in vitro replicates:

3

Irritation parameter:

conjunctivae score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0

Irritation parameter:

conjunctivae score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Irritation parameter:

conjunctivae score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0

Irritation parameter:

conjunctivae score

Basis:

animal: related to all animals

Time point:

24/48/72 h

Max. score:

1

Remarks on result:

other: Max. duration: 1 h; Max. value at end of observation period: 0 (related to all animals)

Irritation parameter:

chemosis score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0

Irritation parameter:

chemosis score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Irritation parameter:

chemosis score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0

Irritation parameter:

chemosis score

Basis:

animal: related to all animals

Time point:

24/48/72 h

Max. score:

0

Remarks on result:

other: Max. duration: h; Max. value at end of observation period: 0 (related to all animals)

Irritation parameter:

cornea opacity score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0

Irritation parameter:

cornea opacity score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Irritation parameter:

cornea opacity score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0

Irritation parameter:

cornea opacity score

Basis:

animal: related to all animals

Time point:

24/48/72 h

Max. score:

0

Remarks on result:

other: Max. duration: h; Max. value at end of observation period: 0 (related to all animals)

Irritation parameter:

iris score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0

Irritation parameter:

iris score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Irritation parameter:

iris score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0

Irritation parameter:

iris score

Basis:

animal: related to all animals

Time point:

24/48/72 h

Max. score:

0

Remarks on result:

other: Max. duration: h; Max. value at end of observation period: 0 (related to all animals)

Irritant / corrosive response data:

Reversibility of any observed effect: Changes fully reversible within 1 day

Other effects:

None.

Interpretation of results:

GHS criteria not met

Conclusions:

1,3-bis[12-hydroxy-octadecamide-N-methylene]-benzene is shown not to be irritating/corrosive to the eye of rabbits.

Executive summary:

The guideline study on eye irritation/corrosion of 1,3-bis[12-hydroxy-octadecamide-N-methylene]-benzene was conducted according to EU Method B.5 using rabbits. The study reports that the application of 45 mg of the test substance does not result in any permanent changes. Any observed effect is fully reversible within one day. Consequently, the GHS classification criteria for eye irritation/corrosion are not met.

Reference 3

Endpoint:

eye irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

other: Annex V

GLP compliance:

yes

Specific details on test material used for the study:

Nature of substance: Powder

Species:

rabbit

Strain:

New Zealand White

Amount / concentration applied:

33 mg (equivalent to 0.1 ml).

Number of animals or in vitro replicates:

3

Irritation parameter:

conjunctivae score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0

Irritation parameter:

conjunctivae score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Irritation parameter:

conjunctivae score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0

Irritation parameter:

conjunctivae score

Max. score:

2

Remarks on result:

other: Max. duration: 24 h; Max. value at end of observation period: 0 (related to all animals)

Irritation parameter:

chemosis score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0

Irritation parameter:

chemosis score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Irritation parameter:

chemosis score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0

Irritation parameter:

chemosis score

Max. score:

0

Remarks on result:

other: Max. duration: 0 h; Max. value at end of observation period: 0 (related to all animals)

Irritation parameter:

cornea opacity score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0

Irritation parameter:

cornea opacity score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Irritation parameter:

cornea opacity score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0

Irritation parameter:

cornea opacity score

Max. score:

0

Remarks on result:

other: Max. duration: 0 h; Max. value at end of observation period: 0 (related to all animals)

Irritation parameter:

iris score

Basis:

animal #1

Time point:

24/48/72 h

Score:

0

Irritation parameter:

iris score

Basis:

animal #2

Time point:

24/48/72 h

Score:

0

Irritation parameter:

iris score

Basis:

animal #3

Time point:

24/48/72 h

Score:

0

Irritation parameter:

iris score

Max. score:

0

Remarks on result:

other: Max. duration: 0 h; Max. value at end of observation period: 0 (related to all animals)

Irritant / corrosive response data:

Reversibility of any observed effect: Changes fully reversible within 1 day.

Other effects:

No signs of toxicity or ill health were observed in any test animal.

Interpretation of results:

GHS criteria not met

Conclusions:

12-hydroxyoctadecanoic acid, reaction products with 1,3-benzenedimethanamine and hexamethylenediamine is shown not to be irritating/corrosive to the eye of New Zealand White rabbits.

Executive summary:

The guideline study on eye irritation/corrosion of 12-hydroxyoctadecanoic acid, reaction products with 1,3-benzenedimethanamine and hexamethylenediamine was conducted according to Annex V using New Zealand White rabbits. The study reports that the application of 33 mg of the test substance does not result in any permanent changes. Any observed effect is fully reversible within one day. Furthermore, no signs of toxicity or ill health were observed in any test animal. Conclusively, the GHS classification criteria for eye irritation/corrosion are not met.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Respiratory irritation

Endpoint conclusion

Endpoint conclusion:

no study available

Justification for classification or non-classification

Based on the experimental results on the read-across substances and the (Q)SAR predictions on the individual constituents the substances is considered non-irritant and non-corrosive. Testing of the substance is not considered necessary and the substance is not classified according to CLP criteria.