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EC number: 218-301-2 | CAS number: 2110-78-3
- 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
Endpoint summary
Administrative data
Description of key information
Skin irritation/corrosion
in vitro EpiDerm skin irritation assay (OECD Guideline 439): non irritant
Eye irritation: A weight of evidence approach was used to address the endpoint of eye irritation
read-across (OECD QSAR Toolbox v4.1): The substance is predicted 'highly irritative to the eye'. It lies within the applicability domain of this model and is based on consistent data.
QSAR prediction (QSAR model 'Eye irritation/corrosion by BfR'): The substance is predicted to be 'irritating or corrosive to the eye'.
Key value for chemical safety assessment
Skin irritation / corrosion
Endpoint conclusion
- Endpoint conclusion:
- no adverse effect observed (not irritating)
Eye irritation
Endpoint conclusion
- Endpoint conclusion:
- adverse effect observed (irritating)
Respiratory irritation
Endpoint conclusion
- Endpoint conclusion:
- no study available
Additional information
Skin irritation/corrosion
In the key in vitro study (KS_RHE EpiDerm skin irritation assay_in vitro_2017) methyl 2-hydroxyisobutyrate was evaluated for skin irritation potential in an non-GLP in vitro EpiDerm skin irritation assay (MatTek Corporation; Ashland, MA) according to OECD Guideline 439. The EpiDerm tissue model consists of normal, human-derived epidermal keratinocytes that are cultured to form a multilayered, differentiated model of human epidermis. In this assay, methyl 2-hydroxyisobutyrate was topically applied to the EpiDerm tissue for 60 minutes, followed by a 42-hour post-exposure recovery. Following recovery, the cell viability was measured in treated and control tissues using MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide) assay and the data reported as a percentage of the mean of negative control. A test chemical was considered to possess skin irritation potential (Cat. 1 or 2) if the relative cell viability was less than or equal to 50%. In this study, Dulbecco’s Phosphate Buffered Saline (DPBS) and 1% TRITON™ X-100 served as the negative and positive controls, respectively.
The mean relative cell viability of methyl 2-hydroxyisobutyrate- and positive control-treated tissues were 98.1% and 3.2% (i.e. ≤ 50%), respectively, therefore, methyl 2-hydroxyisobutyrate was interpreted as a non-irritant (Cat. NC) in the EpiDerm irritation assay.
In a supporting in vivo primary skin irritation study (SS_Skin irritation study_in ivo_rabbit_1993) methyl 2-hydroxyisobutyrate was assessed in accordance with the OECD Guideline 404 (1981).
Briefly, methyl 2-hydroxyisobutyrate was topically applied to the back skin (circular area of about 6 cm2) of 3 Japanese white rabbits for 4 hrs, and the skin was macroscopically examined over time after completion of exposure. No evidence of skin irritation was observed in any of the 3 rabbits in the initial examination 30-60 min after completion of the exposure to methyl 2 -hydroxyisobutyrate and in the subsequent examination period completed 168 hrs later.
The primary irritation index (P.I.I.) was determined to be 0.0 based on findings obtained 30-60 min, 24 hrs, and 72 hrs after termination of exposure to methyl 2-hydroxyisobutyrate, indicating that it causes no primary skin irritation.
Eye irritation
Read-across on eye irritation potential of methyl 2-hydroxyisobutyrate was performed using the OECD QSAR Toolbox (version 4.1). The substance is predicted 'highly irritative to the eye'. It lies within the applicability domain of this model and is based on consistent data. Three of the analogues ( Propyl L-lactate CAS 53651-69-7, Polysolvan O CAS 7397-62-8 and 3-Hydroxy-2,2-dimethylpropyl 3-hydroxy-2,2-dimethylpropanoate CAS 1115-20 -4) used for the prediction induced irreversible effects to the eye in rabbits or in the ex vivo Enucleated Eye Test with chicken eyes (CEET).
In addition eye irritation potential of methyl 2-hydroxyisobutyrate was predicted with the QSAR model 'Eye irritation/corrosion by BfR'. It is predicted to be 'irritating or corrosive to the eye'.
Justification for classification or non-classification
Skin irritation/corrosion
The substance methyl 2-hydroxyisobutyrate was assessed in the in vitro EpiDerm skin irritation assay as non irritating. This finding is supported by an skin irritation study according to OECD Guideline 404. Therefore, methyl 2 -hydroxyisobutyrate is not classified as skin irritant in accordance to Regulation (EC) No 1272/2008 (CLP Regulation).
Eye irritation
In a weight of evidence QSAR approach the substance was predicted to to be 'highly eye irritating'. Therefore it is concluded that the test item does meet the criteria for classification as eye irritant Cat. 1 (Eye Dam. 1, H318: Causes serious eye damage) according to Regulation (EC) No 1272/2008 (CLP Regulation).
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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