Reaction mass of 2-dodecylhexadecyl methacrylate and 2-Tetradecyloctadecyl methacrylate

Skin sensitisation

Administrative data

Endpoint:

skin sensitisation: in vitro

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2019

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2019

Report date:

2019

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 442C (In Chemico Skin Sensitisation: Direct Peptide Reactivity Assay (DPRA))

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of study:

direct peptide reactivity assay (DPRA)

Test material

Test material information

impurity 1

Reference substance name:

Unknown Impurities

IUPAC Name:

Unknown Impurities

impurity 2

Reference substance name:

13-Methylheptacosane

Molecular formula:

C28H58

IUPAC Name:

13-Methylheptacosane

impurity 3

Reference substance name:

Hexadecyl methacrylate

EC Number:

219-672-3

EC Name:

Hexadecyl methacrylate

Cas Number:

2495-27-4

Molecular formula:

C20H38O2

IUPAC Name:

hexadecyl methacrylate

impurity 4

Reference substance name:

Tridecyl methacrylate

EC Number:

219-671-8

EC Name:

Tridecyl methacrylate

Cas Number:

2495-25-2

Molecular formula:

C17H32O2

IUPAC Name:

tridecyl methacrylate

impurity 5

Reference substance name:

Pentadecyl methacrylate

EC Number:

228-126-3

EC Name:

Pentadecyl methacrylate

Cas Number:

6140-74-5

Molecular formula:

C19H36O2

IUPAC Name:

pentadecyl methacrylate

impurity 6

Reference substance name:

Tetradecyl methacrylate

EC Number:

219-835-9

EC Name:

Tetradecyl methacrylate

Cas Number:

2549-53-3

Molecular formula:

C18H34O2

IUPAC Name:

tetradecyl methacrylate

impurity 7

Reference substance name:

Dodecyl methacrylate

EC Number:

205-570-6

EC Name:

Dodecyl methacrylate

Cas Number:

142-90-5

Molecular formula:

C16H30O2

IUPAC Name:

dodecyl methacrylate

impurity 8

Reference substance name:

2-Decyltetradecyl methacrylate

Molecular formula:

C28H54O2

IUPAC Name:

2-Decyltetradecyl methacrylate

Constituent 1

Reference substance name:

2-Tetradecyloctadecyl methacrylate

Cas Number:

1046154-63-5

Molecular formula:

C36H70O2

IUPAC Name:

2-Tetradecyloctadecyl methacrylate

Constituent 2

Reference substance name:

2-Dodecylhexadecyl methacrylate

Cas Number:

536972-42-6

Molecular formula:

C32H62O2

IUPAC Name:

2-Dodecylhexadecyl methacrylate

Test material form:

liquid

In vitro test system

Details on the study design:

The DPRA is proposed to address the molecular initiating event of the skin sensitisation Adverse Outcome Pathway (AOP), namely protein reactivity, by quantifying the reactivity of test and reference items towards model synthetic peptides containing either Lysine or Cysteine. Cysteine and Lysine percent peptide depletion values are then used to categorise a substance in one of four classes of reactivity for supporting the discrimination between skin sensitisers and non-sensitisers.

Results and discussion

In vitro / in chemico

Results

Key result

Run / experiment:

other: final mean % peptide depletion

Parameter:

other: % peptide depletion

Value:

2.983

Vehicle controls validity:

valid

Negative controls validity:

not examined

Positive controls validity:

valid

Remarks on result:

no indication of skin sensitisation

Other effects / acceptance of results:

OTHER EFFECTS:
- Visible damage on test system: None reported

ACCEPTANCE OF RESULTS:
- Acceptance criteria met for negative control: YES
- Acceptance criteria met for positive control: YES
- Acceptance criteria met for variability between replicate measurements: YES

Any other information on results incl. tables

Prior to the main test, the test item was assessed for solubility and was found to be soluble in Isopropanol at 100mM.

Name	Test Item ID	% Cysteine Peptide Depletion	% Lysine Peptide Depletion	Mean % Peptide Depletion (Cys + Lys)	DPRA Prediction based on Cysteine 1 :10 prediction model	DPRA Reactivity Class
Reaction mass of 2-Propenoic acid, 2-methyl-, 2-dodecylhexadecyl ester and 2-Propenoic acid, 2-methyl-, 2-tetradecyloctadecyl ester (EC 946-978-0)	TA1	2.983	Acceptance criteria not met, not included in the analysis	Not applicable	Negative	No or minimal reactivity

Applicant's summary and conclusion

Interpretation of results:

other: Negative with No or minimal reactivity

Conclusions:

Reaction mass of 2-Propenoic acid, 2-methyl-, 2-dodecylhexadecyl ester and 2-Propenoic acid, 2-methyl-, 2-tetradecyloctadecyl ester (EC 946-978-0) was classified as Negative with No or minimal reactivity as per the prediction model for skin sensitisation.

Executive summary:

The skin sensitisation potential of Reaction mass of 2-Propenoic acid, 2-methyl-, 2-dodecylhexadecyl ester and 2-Propenoic acid, 2-methyl-, 2-tetradecyloctadecyl ester (EC 946-978-0) was assessed using the In Chemico Direct Peptide Reactivity Assay (DPRA) method according to OECD Test Guideline 442C. After a 24h incubation with both Cysteine and Lysine containing peptides, the percent peptide depletion was measured by High Performance Liquid Chromatography (HPLC).

For assessment of Reaction mass of 2-Propenoic acid, 2-methyl-, 2-dodecylhexadecyl ester and 2-Propenoic acid, 2-methyl-, 2-tetradecyloctadecyl ester (EC 946-978-0) the Cysteine peptide 1:10 prediction model was used. The final mean % peptide depletion observed using this model was 2.983%.

Therefore, Reaction mass of 2-Propenoic acid, 2-methyl-, 2-dodecylhexadecyl ester and 2-Propenoic acid, 2-methyl-, 2-tetradecyloctadecyl ester (EC 946-978-0) was classified as Negative with No or minimal reactivity as per the prediction model.