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EC number: 242-361-9 | CAS number: 18479-57-7
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data

Skin irritation / corrosion
Administrative data
- Endpoint:
- skin irritation: in vitro / ex vivo
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 4 Jan - 10 Feb 2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 017
- Report date:
- 2017
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 439 (In Vitro Skin Irritation: Reconstructed Human Epidermis Test Method)
- Version / remarks:
- 2015
- Qualifier:
- according to guideline
- Guideline:
- EU Method B.46 (In Vitro Skin Irritation: Reconstructed Human Epidermis Model Test)
- Version / remarks:
- No 761/2009
- Qualifier:
- according to guideline
- Guideline:
- other: UN GHS
- Version / remarks:
- published 2003, last (6th) revision 2015
- GLP compliance:
- yes (incl. QA statement)
Test material
- Reference substance name:
- 2,6-dimethyloctan-2-ol
- EC Number:
- 242-361-9
- EC Name:
- 2,6-dimethyloctan-2-ol
- Cas Number:
- 18479-57-7
- Molecular formula:
- C10H22O
- IUPAC Name:
- 2,6-dimethyloctan-2-ol
- Test material form:
- liquid
1
In vitro test system
- Test system:
- human skin model
- Source species:
- human
- Cell type:
- non-transformed keratinocytes
- Cell source:
- other: SkinEthic Laboratories, Lyon, France
- Source strain:
- other: not applicable
- Justification for test system used:
- According to testing guideline OECD Guideline 439
- Vehicle:
- unchanged (no vehicle)
- Details on test system:
- RECONSTRUCTED HUMAN EPIDERMIS (RHE) TISSUE
- Model used: EPISKIN TM
- Tissue batch number(s): 17-EKIN-006
- Production date/Shipping date: no data
- Delivery date: 07 February 2017
- Date of initiation of testing: 07 February 2017
TEMPERATURE USED FOR TEST SYSTEM
- Temperature used during treatment / exposure/ post-treatment incubation: 37 °C
REMOVAL OF TEST MATERIAL AND CONTROLS
-Tissues were washed with phosphate buffered saline to remove residual test item.
MTT DYE USED TO MEASURE TISSUE VIABILITY AFTER TREATMENT / EXPOSURE
- MTT concentration: 0.3 mg/ml in PBS
- Incubation time: 3 hours at 37 °C
- Spectrophotometer: not specified
- Wavelength: 570 nm
- Filter: no information
NUMBER OF REPLICATE TISSUES: 3
DECISION CRITERIA
- A test substance is considered irritant in the skin irritation test if: The relative mean tissue viability of three individual tissues after 15 minutes of exposure to the test substance and 42 hours of post incubation is ≤ 50% of the mean viability of the negative controls.
- A test substance is considered non-irritant in the in vitro skin irritation test if: The relative mean tissue viability of three individual tissues after 15 minutes of exposure to the test substance and 42 hours of post incubation is > 50% of the mean viability of the negative controls. - Control samples:
- yes, concurrent negative control
- yes, concurrent positive control
- Amount/concentration applied:
- TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 10 μL - Duration of treatment / exposure:
- 15 minutes
- Duration of post-treatment incubation (if applicable):
- 42 hours
- Number of replicates:
- 3
Results and discussion
In vitro
Results
- Irritation / corrosion parameter:
- % tissue viability
- Run / experiment:
- Relative mean tissue viability compared to the negative control tissues (100%)
- Value:
- 13.4
- Vehicle controls validity:
- not applicable
- Negative controls validity:
- valid
- Positive controls validity:
- valid
- Remarks:
- 9.7
- Remarks on result:
- positive indication of irritation
- Other effects / acceptance of results:
- OTHER EFFECTS:
- Direct-MTT reduction: No colour changes observed
- Colour interference with MTT: No colour changes observed
ACCEPTANCE OF RESULTS:
-The relative mean tissue viability for the positive control treated tissues was 9.7% relative to the negative control treated tissues and the standard deviation value of the viability was 13.8%. The positive control
acceptance criteria were therefore satisfied.
-The mean OD570 for the negative control treated tissues was between ≥ 0.6 and ≤ 1.5 and the standard deviation value of the viability was 13.9%. The negative control acceptance criteria were therefore satisfied.
-The standard deviation calculated from individual tissue viabilities of the three identically test item treated tissues was 8.0%. The test item acceptance criterion was therefore satisfied.
Any other information on results incl. tables
Results after treatment with Tetrahydro Myrcenol and controls
Test Group | Mean Absorbance of 3 Tissues | Relative Absorbance [%] Tissue 1, 2 + 3** | Relative Standard Deviation [%] | Rel. Absorbance [% of Negative Control]*** |
Negative Control | 0.888 | 101.0 / 113.4 / 85.6 | 13.9 | 100.0 |
Positive Control | 0.086 | 8.4 / 9.6 / 11.1 | 13.8 | 9.7 |
Test Item | 0.119 | 12.7 / 12.8 / 14.6 | 8.0 | 13.4 |
* Mean of two replicate wells after blank correction
** relative absorbance per tissue [rounded values]
*** relative absorbance per treatment group [rounded values]
Applicant's summary and conclusion
- Interpretation of results:
- other: Skin irritant Category 2
- Remarks:
- according to EU CLP criteria (1272/2008/EC and its updates)
- Conclusions:
- Under the conditions of this test, the relative mean tissue viability for the test item determined to be 13.4%. This value is below the threshold for irritancy of ≤50%.
- Executive summary:
The possible skin irritation potential of Tetrahydro Myrcenol was tested in vitro using a human skin model through topical application for 15 minutes. The study procedures described in this report were according to OECD TG 439 guideline and GLP principles. Skin tissue was treated by topical application of 10 μL undiluted test substance. After 42 hours post-incubation period, determination of the cytotoxic (irritancy) effect was performed. Cytotoxicity is expressed as the reduction of mitochondrial dehydrogenase activity measured by formazan production from (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl-tetrazolium bromide) MTT at the end of treatment. Skin irritation is expressed as the remaining cell viability after exposure to the test substance. Reliable negative and positive controls were included. The positive control had a mean cell viability of 9.7% after 15 minutes exposure. The standard deviation value of the percentage viability of three tissues treated identically was less than 18%, indicating that the test system functioned properly. Under the conditions of this test, the relative mean tissue viability for the test item determined to be 13.4%. This value is below the threshold for irritancy of ≤50%. Based on the results obtained, it can be concluded that Tetrahydromyrcenol is category 2 skin irritant.
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