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Diss Factsheets
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EC number: 941-064-8 | 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
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Skin irritation / corrosion
Administrative data
- Endpoint:
- skin corrosion: in vitro / ex vivo
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2010-09-30 to 2010-10-04
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 010
- Report date:
- 2010
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 431 (In Vitro Skin Corrosion: Human Skin Model Test)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- signed 2009-03-30
Test material
- Reference substance name:
- Cobalt(2+) propionate
- EC Number:
- 216-333-1
- EC Name:
- Cobalt(2+) propionate
- Cas Number:
- 1560-69-6
- Molecular formula:
- C3H6O2.1/2Co
- IUPAC Name:
- cobalt(2+) dipropanoate
- Details on test material:
- - Name of test material (as cited in study report): cobalt propionate
- Physical state: Solid
- Storage condition of test material: At room temperature
No further information on the test material was stated.
Constituent 1
Test animals
- Details on test animals or test system and environmental conditions:
- Not applicable - Since this is an in vitro study there is no information on test animals.
Test system
- Vehicle:
- water
- Amount / concentration applied:
- The test material was not crushed or ground in a mortar and a pestle since this did not improve the consistency.
TEST MATERIAL
- Amount(s) applied (volume or weight with unit): About 25 mg of the test material were applied to the tissues and wetted with 25 μL deionised water. The test item was spread to cover the surface of the tissue.
No further information on the amount/concentration applied was stated. - Duration of treatment / exposure:
- Exposure periods of 3 and 60 minutes
- Observation period:
- not applicable
- Number of animals:
- not applicable
- Details on study design:
- CELL CULTURE:
EST-1000™ kits (Lot No.: EST 100329-001) were purchased from CellSystems® Biotechnologievertrieb GmbH (53562 St. Katharinen; Germany). The EST-1000™ tissue consisted of normal, human-derived epidermal keratinocytes which have been cultured to form a multilayered, highly differentiated model of the human epidermis. It consisted of organized basal, spinous and granular layers, and a multi-layered stratum corneum containing intercellular lamellar lipid layers arranged in patterns analogous to those found in vivo. The EST-1000™ tissues (surface 0.6 cm²) were cultured on specially prepared cell culture inserts (MILLICELLs®, 10 mm ∅).
EST-1000™ kits were shipped at 4 °C on medium-supplemented agarose gels in a 24-well plate. On day of receipt EST-1000™ tissues were kept in the refrigerator at 2 - 8 °C in the refrigerator.
The Human Skin Model supplier ensured and demonstrated that each batch of the Human Skin Model used met defined production release criteria, e.g. viability, barrier function, no bacterial and mycoplasma contamination and morphology.
PRE-WARMING OF EST 1000TM TISSUES:
At least one hour before dosing the EST-1000™ tissues were removed from the refrigerator. Under sterile conditions using sterile forceps, the inserts were transferred into 6-well plates containing the pre-warmed maintenance medium. Two 24-well plates were prepared as holding plates, each well containing 300 μL maintenance medium per well. The holding plates were pre-warmed in an incubator (37 ± 1.5 °C, 5 ± 0.5% CO2) until use.
EXPOSURE:
Duplicate EST-1000™ tissues were exposed to the test item, positive control (potassium hydroxide as 8.0 N ready-made solution (Cat. No. 17-8, Sigma 82024 Taufkirchen, Lot No.096K6091); Volume 50 µL) or negative control (deionised water (Lot no. 23.3.10, produced in-house); Volume 50 µL) for each of two different exposure periods.
After the pre-incubation of the EST-1000™ tissues was completed (1 hour 30 minutes for the 1 hour exposure and about 2 hours 25 minutes for the 3 minutes exposure) the medium in each well was replaced by 1.0 mL fresh maintenance medium per well. The negative control was added to the surface of duplicate EST-1000™ tissues. Subsequently, the remaining tissues were exposed to the test item and the positive control in the same manner. The 6-well plates were then placed into an incubator (37 ± 1.5 °C, 5 ± 0.5% CO2).
At the end of the exposure period the tissues were removed from the 6-well plate and gently rinsed using a wash bottle containing PBS to remove any residual test material. Excess PBS was removed by gently shaking the tissue insert and blotting the lower surface with blotting paper.
MTT ASSAY:
After the exposure procedure was completed for all tissues of each time point, the cell culture inserts were transferred from the holding plates to the plates containing 300 µL of MTT solution (MTT solution with a final concentration of 1 mg/ml). After a 3 hour incubation period (37 ± 1.5 °C, 5 ± 0.5% CO2) the MTT solution was aspirated from the wells and the wells were rinsed three times with PBS. The inserts were transferred into new 24-well plates. The inserts were immersed in extractant solution by gently pipetting 2 mL of extractant solution (isopropanol) into each insert ensuring that the tissue was completely covered. The 24-well plate was sealed to minimise isopropanol evaporation. The formazan salt was extracted for about 18.5 hours while shaking at room temperature.
After the extraction period the inserts were pierced with an injection needle to allow the extract to run into the well from which the insert was taken, and the insert was discarded. 24-well plates were then placed on a shaker for approx. 15 minutes until the solution was homogeneous in colour.
3 × 200 μL aliquots of the blue formazan solution were transferred from each tissue into a 96-well flat bottom microtiter plate. The optical density (OD) was read in a microplate reader (Versamax® Molecular Devices, 85737 Ismaning, Germany) at 570 nm (OD570) without reference filter. The mean values were calculated for each set of 3 wells per tissue insert.
TEST FOR DIRECT MTT REDUCTION BY TEST ITEM:
To check MTT reducing capability of the test item, a solution of MTT in DMEM (1.0 mg/mL) was prepared and each about 50mg of the test item were added to 1 mL MTT medium. If the mixture turned blue/purple after about 1 hour at room temperature, the test material would have been presumed to have reduced the MTT.
INTERPRETATION OF RESULTS:
The mean OD value obtained for the duplicate tissues per test item were used to calculate the percent viability relative to the negative control, which was arbitrarily set at 100%.
According to EU CLP Cat.1 and DSD (67/548/EEC):
The test item is considered to be corrosive to skin:
(1) if the viability after 3 minutes exposure is less than 50%, or
(2) if the viability after 3 minutes exposure is greater than or equal to 50% and the viability after 1 hour exposure is less than 15%.
The test item is considered to be non-corrosive to skin:
(1) if the viability after 3 minutes exposure is greater than or equal to 50% and the viability after 1 hour exposure is greater than or equal to 15%.
ACCEPTABILITY OF THE ASSAY:
The absolute OD570 of the negative control tissues in the MTT-test is an indicator of tissue viability obtained in the testing laboratory after the shipping and storing procedure and under specific conditions of the assay. Tissue viability met the acceptance criterion if the mean OD570 of the two tissues in both treatment intervals was ≥ 0.8.
The assay met the acceptance criterion if mean relative tissue viability of the positive control was ≤ 30%.
No further information on the study design was stated.
Results and discussion
In vitro
Resultsopen allclose all
- Irritation / corrosion parameter:
- % tissue viability
- Run / experiment:
- after 3 minute treatment
- Value:
- 84.4
- Vehicle controls validity:
- not examined
- Negative controls validity:
- valid
- Positive controls validity:
- valid
- Irritation / corrosion parameter:
- % tissue viability
- Run / experiment:
- after 1 hour treatment
- Value:
- 57.9
- Vehicle controls validity:
- not examined
- Negative controls validity:
- valid
- Positive controls validity:
- valid
- Other effects / acceptance of results:
- After exposure to the test item cobalt oxyhydroxide the relative absorbance values were reduced to 84.4% after 3 minutes. After the 1 hour exposure relative absorbance values were reduced to 57.9%. Both values did not exceed the threshold for corrosivity of 50% for the 3 minutes exposure and 15% for the 1 hour exposure. Therefore, the test item was not considered to be corrosive.
- After exposure to the negative control the absorbance values exceeded the required acceptability criterion of mean OD570 ≥ 0.8 for the two tissues in both treatment intervals thereby confirming the acceptable quality of the tissues.
- Exposure to the positive control decreased the relative absorbance as compared to the negative
control for the 3 minutes exposure period and for the 1 hour exposure period thus confirming the validity of the test system.
Applicant's summary and conclusion
- Interpretation of results:
- GHS criteria not met
- Conclusions:
- The test item cobalt propionate was non corrosive to skin according to Regulation (EC) No. 1272/2008.
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.
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