Reaction products of acetic acid with formaldehyde and a mixture of 1-, 2-, 3-,octene

Skin irritation / corrosion

Administrative data

Endpoint:

skin corrosion: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

April - June 2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2017

Materials and methods

Test guideline

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 material

Test material information

Constituent 1

Reference substance name:

Tetrahydro-3-pentyl-2H-pyran-4-yl acetate

EC Number:

242-640-5

EC Name:

Tetrahydro-3-pentyl-2H-pyran-4-yl acetate

Cas Number:

18871-14-2

Molecular formula:

C12H22O3

IUPAC Name:

3-O-acetyl-1,5-anhydro-2,4-dideoxy-2-pentylpentitol

Constituent 2

Reference substance name:

3-butyltetrahydro-5-methyl-2H-pyran-4-yl acetate

EC Number:

253-863-2

EC Name:

3-butyltetrahydro-5-methyl-2H-pyran-4-yl acetate

Cas Number:

38285-49-3

Molecular formula:

C12H22O3

IUPAC Name:

3-O-acetyl-1,5-anhydro-2-butyl-2,4-dideoxy-4-methylpentitol

impurity 1

Reference substance name:

3-pentyltetrahydro-2H-pyran-4-ol

Cas Number:

24646-98-8

Molecular formula:

C10H20O2=

IUPAC Name:

3-pentyltetrahydro-2H-pyran-4-ol

impurity 2

Reference substance name:

Likely acetylated constituents, MW 214

Molecular formula:

n/a

IUPAC Name:

Likely acetylated constituents, MW 214

impurity 3

Reference substance name:

Likely acetylated constituents

Molecular formula:

n/a

IUPAC Name:

Likely acetylated constituents

impurity 4

Reference substance name:

Unknown constituent, MW 172

Molecular formula:

n/a

IUPAC Name:

Unknown constituent, MW 172

Test material form:

liquid

Details on test material:

UVCB substance

Specific details on test material used for the study:

Batch no.: PE00138468
Expiry date: 20 February 2018

In vitro test system

Test system:

human skin model

Source species:

human

Cell type:

non-transformed keratinocytes

Justification for test system used:

The test system EPISKIN™is a reconstructed human epidermis (RhE) model, which in its overall design (the use of human derived epidermis keratinocytes as cell source and use of representative tissue and cytoarchitecture) closely mimics the biochemical and physiological properties of the upper parts of the human skin, i.e., the epidermis.
The principle of the RhE test method is based on the premise that chemicals are able to penetrate the stratum corneum and irritant chemicals are cytotoxic to the cells in the underlying layers. Cell viability is measured by dehydrogenase conversion of the vital dye MTT [3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide, Thiazolyl blue; CAS N. 298-93-1] into a blue formazan salt that is quantitatively measured after extraction from tissues. Irritant chemicals are identified by their ability to decrease cell viability below defined threshold levels.

Vehicle:

unchanged (no vehicle)

Details on test system:

Positive control item was 5% (w/v) sodium dodecyl sulphate (SDS) solution, obtained by 1:1 dilution in sterile water (Baxter, batch no. 15G2401) of a sterile commercial 10% (w/v) SDS solution in water (SIGMA, batch no. BCBP9757V).
Negative control item was D-PBS (GIBCO, batch no.1786985).

Amount/concentration applied:

20 µL per well

Duration of treatment / exposure:

An exposure time of 15±0.5 minutes was allowed in a ventilated cabinet at room temperature.

Duration of post-treatment incubation (if applicable):

At the end of the exposure, each tissue was rinsed with approximately 25mL of sterile D-PBS, filling and empting the tissue insert. The excess liquid was carefully removed and the sample transferred in new wells pre-filled with 2mL/well of maintenance medium.
A 42 ± 1 hour recovery period was allowed by incubation at 37°C, 5% CO2 and saturated humidity.

Number of replicates:

3 Negative control
3 Positive control
3 Test item (Jasmonyl LG).

Results and discussion

In vitro

Results

Irritation / corrosion parameter:

% tissue viability

Run / experiment:

Mean

Value:

101

Vehicle controls validity:

valid

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

no indication of irritation

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met

Executive summary:

The potential of the test item JASMONYL LG to be irritant to the skin was investigated through an in vitro skin irritation study, using a commercial reconstructed human epidermis (RhE) model named EPISKIN™.

The blank, negative and positive controls gave acceptable results and the study was accepted as valid.

The mean cell viability of the test item treated tissues, after the blank subtraction, was 101%.

Based on the results obtained, the test item JASMONYL LG is classified as not irritating to the skin (UN GHS No Category).