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EC number: 286-061-6 | CAS number: 85186-76-1
- 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
Link to relevant study record(s)
Description of key information
The fatty acids linked with 2-ethylhexyl esters have a common metabolic fate in organisms as glycolytic and fatty acid pathways after first hydrolysis step which led in breakdown products. The common toxicokinetic properties and behavior are expected due to the constant pattern (ethylhexyl esters and the fatty acid chain). Based on the category approach and the physico-chemical properties of the source substances, the target substance is expected to have no bioaccumulation potential.
Key value for chemical safety assessment
- Bioaccumulation potential:
- no bioaccumulation potential
Additional information
The fatty acid esters of the LCAE C8-C18 category are considered to undergo hydrolysis in the gastrointestinal (GI) tract by ubiquitous expressed GI enzymes (Lehninger, 1970; Mattson and Volpenhein, 1972). The breakdown products of ester hydrolysis are free alcohols (2-ethylhexanol) and the respective free fatty acids with carbon chain length from C8-C18, mainly satured but also unsatured. Due to their physical-chemical properties, the main route of exposure of the fatty acid esters of the category is via the oral route.
Absorption
The absorbed esters undergo stepwise chemical changes in the gastrointestinal fluids as a result of enzymatic hydrolysis. The respective alcohols as well as the fatty acid are formed (Mattson and Volpenhein, 1972). For both cleavage products absorption will occur in the gastrointestinal tract: The highly lipophilic fatty acid is absorbed by micellar solubilization (Ramirez et al. 2001), soluble alcohol are dissolved in pancreatic juice and the ester can be distributed.
Dermal absorption:
According to the current literature, esterase enzymes were present into the skin of different mammalian species (as human, rodents or minpigs). These enzymes, as carboxylesterase, hydrolyzed different substrates as xenobiotic or different ester as fatty acids esters (C. Jewell, 2007; J.J. Prusakiewicz, 2006). Based on this principle, when applied on skin, the source and the target substances are expected to be substrates of these carboxylesterase. They are hydrolyzed into fatty acids and alcohols. In the case that the products of hydrolysis could across the dermal barrier to reach systemic system, they have the same behavior as oral ingestion. The potential toxicity should be brought by these hydrolyzed products.
Distribution
The alcohol components have low molecular weights (131.02 g/mol) and high to moderate water solubility (In water, 880 mg/L at 25°C) and will therefore be widely distributed within the body (ECHA, 2008; HSDB, 2011; Amidon GL, 1974 citated in HSDB).
The high log Pow value of the category members implies that they have the potential to accumulate in adipose tissue. However, as they undergo esterase-catalysed hydrolysis, the accumulation of the cleavage products has to be considered. Substances with high water solubility, like the alcohols, do not have the potential to accumulate in adipose tissue due to their low log Pow. In contrast, accumulation of the fatty acids in triglycerides in adipose tissue or the incorporation into cell membranes is possible. Overall, the available information that they were required as energy source, indicates that no significant bioaccumulation in adipose tissue is anticipated.
Metabolisation
Esters of fatty acids are hydrolysed to the corresponding alcohol and fatty acid by esterases (Fukami and Yokpo, 2012). Depending on the route of exposure, esterase-catalysed hydrolysis takes place in different places in the organism: after oral ingestion, esters of alcohol and fatty acids undergo enzymatic hydrolysis already in GI fluids. In contract, substances that are absorbed through the pulmonary alveolar membrane or through the skin enter the systemic circulation directly before joining the liver where hydrolysis basically takes place. The first cleavage product, the alcohol, is oxidized in several steps by the nonspecific alcohol dehydrogenase and the aldehyde dehydrogenase to the corresponding aldehyde and alcohol. Glucuronidation will also take place at all steps to facilitate urinary excretion (HSDB, 2011). The second cleavage product, the fatty acid, is stepwise degraded by beta-oxydation based on enzymatic removal of C2 units in the matrix of mitochondria in most vertebrate tissues. The C2 units are cleaved as acyl-CoA, the entry molecular of citric acid cycle. The omega- and alpha-oxydation, alternative pathways for oxidation can be found in the liver and the brain, respectively.
Based on the metabolism described, the fatty acids esters and the breakdown products will be metabolised in the body in high extent. The fatty acid components will be metabolized for energy generation or stored as lipid in adipose tissue or used for further physiological properties as incorporation in lipid cell membranes (Lehninger 1970; Stryer 1994).
Excretion
The fatty acid component are not expected to be excreted to a significant degree via urine or faeces but excreted via exhaled air as CO2 or stored. The second route of excretion is expected to be by biliary excretion within the faeces. For the alcohol, the main route is renal excretion via the urine due to the low molecular weight and the high water solubility (HSDB, 2011)
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