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Diss Factsheets
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EC number: - | CAS number: -
- 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
![](https://echa.europa.eu/o/diss-blank-theme/images/factsheets/A-REACH/factsheet/print_toxicological-information.png)
Skin irritation / corrosion
Administrative data
- Endpoint:
- skin irritation: in vitro / ex vivo
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- October 20, 2014 - October 27, 2014
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: The study has been performed according to OECD and/or EC guidelines and according to GLP principles.
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 014
- Report date:
- 2014
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- EU Method B.46 (In Vitro Skin Irritation: Reconstructed Human Epidermis Model Test)
- Version / remarks:
- (2012)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 439 (In Vitro Skin Irritation: Reconstructed Human Epidermis Test Method)
- Version / remarks:
- (2013)
- Deviations:
- no
- GLP compliance:
- yes
Test material
- Details on test material:
- - Name of test material (as cited in study report): L 131
- Appearance: Faint light-green powder
Constituent 1
Test animals
- Species:
- human
- Details on test animals or test system and environmental conditions:
- ENVIRONMENTAL CONDITIONS
- All incubations, with the exception of the test substance incubation of 15 minutes at room temperature, were carried out in a controlled environment, in which optimal conditions were a humid atmosphere of 80 - 100% (actual range 77 - 88%), containing 5.0 ± 0.5% CO2 in air in the dark at 37.0 ± 1.0°C (actual range 36.1 – 36.6°C). Temperature and humidity were continuously monitored throughout the experiment. The CO2 percentage was monitored once on each working day.
- Temporary deviations may have occurred and were caused by opening and closing of the incubator door.
Test system
- Vehicle:
- unchanged (no vehicle)
- Amount / concentration applied:
- TEST MATERIAL
- Amounts applied: 13.6 to 16.0 mg
- The test material was spread to match the size of the tissue
NEGATIVE CONTOL:
- Amount applied: 25 µL Phosphate buffered saline
POSITIVE CONTROL
- Amount applied: 25 µL
- Concentration: 5% (aq) Sodium dodecyl sulphate in Phosphate buffered saline - Duration of treatment / exposure:
- 15 minutes
- Details on study design:
- TEST SITE
- EPISKIN Small ModelTM (EPISKIN-SMTM, 0.38 cm2, Batch no.: 14-EKIN-040). This model is a three-dimensional human epidermis model, which consists of adult human-derived epidermal keratinocytes which have been seeded on a dermal substitute consisting of a collagen type I matrix coated with type IV collagen. The keratinocytes were cultured for 13 days, which results in a highly differentiated and stratified epidermis model comprising the main basal, supra basal, spinous and granular layers and a functional stratum corneum.
TEST FOR REDUCTION OF MTT
The substance was checked for possible direct MTT reduction before the study was started. To assess the ability of the test substance to reduce MTT, 14.8 mg of the test substance was added to 2 mL MTT solution (0.3 mg/mL in PBS). The mixture was incubated for 3 hours at 37°C. A negative control, sterile Milli-Q water was tested concurrently.
APPLICATION/TREATMENT
The test was performed on a total of 3 tissues per test substance together with negative and positive controls. The skin was moistened with 15 μL Milli-Q water (Millipore Corp., Bedford, Mass., USA) to ensure close contact of the test substance to the tissue and the solid test substance (13.6 to 16.0 mg; with a small glass weight boat) was added into 12-well plates on top of the skin tissues. Three tissues were treated with 25 μL PBS (negative control) and 3 tissues with 25 μL 5% SDS (positive control) respectively. The positive control was re-spread after 7 minutes contact time.
REMOVAL OF TEST SUBSTANCE
- Washing: phosphate buffered saline
- Time after start of exposure: 15 minutes
POST INCUBATION PERIOD
- 42 hours
SCORING SYSTEM:
- Cytotoxicity is expressed as the reduction of mitochondrial dehydrogenase activity measured by formazan production from MTT at the end of the treatment. Cell viability was calculated for each tissue as a percentage of the mean of the negative control tissues.
Results and discussion
In vitro
Results
- Irritation / corrosion parameter:
- other: other: tissue viability
- Value:
- 97
- Remarks on result:
- other:
- Remarks:
- Basis: other: percentage of control. Time point: 15 minutes. Remarks: Negative control = 100%; Positive control = 27%. (migrated information)
In vivo
- Irritant / corrosive response data:
- Mean tissue viability for the test substance was > 50% (97%), therefore the test substance is considered not to be irritant to the skin.
Any other information on results incl. tables
The test substance was checked for possible direct MTT reduction by adding the test substance to MTT medium. Because no colour change was observed it was concluded that the test substance did not interact with MTT.
Applicant's summary and conclusion
- Interpretation of results:
- not irritating
- Remarks:
- Migrated information Criteria used for interpretation of results: EU
- Conclusions:
- The in vitro skin irritation test was conducted according to OECD 439 guideline and GLP principles. It is concluded that this test is valid and that the test substance is not irritating in the in vitro skin irritation test.
- Executive summary:
In an in vitro skin irritation test using a human skin model (EPISKIN Small Model), conducted according to OECD 439 and GLP principles, the influence of L 131 on the viability of human skin was tested. The test substance was applied directly to 0.38 cm2 cultured skin (13.6 to 16.0 mg, in presence of 15 μL Milli-Q water). After 15 minutes, the substance was removed and cells were cultured for 42 hours. The viability of the cells was tested by reduction of MTT. Survival of unexposed skin was set at 100%, the positive control had a mean cell viability of 27% whereas the test substance showed cell viability of 97%. Since the mean relative tissue viability after exposure to the test substance was above 50%, it is concluded that the test substance is not irritating in the in vitro skin irritation test.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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