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EC number: 203-079-1 | CAS number: 103-09-3
- 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
Basic toxicokinetics
Administrative data
- Endpoint:
- basic toxicokinetics in vivo
- Type of information:
- migrated information: read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Comparable to guideline study; hydrolysis product of 2-ethylhexyl acetate
Data source
Reference
- Reference Type:
- publication
- Title:
- Unnamed
- Year:
- 1 975
Materials and methods
- Objective of study:
- other: ADME
- Principles of method if other than guideline:
- Oral rat ADME studies using [14]C-2-EH
- GLP compliance:
- no
Test material
- Reference substance name:
- 2-ethylhexan-1-ol
- EC Number:
- 203-234-3
- EC Name:
- 2-ethylhexan-1-ol
- Cas Number:
- 104-76-7
- Molecular formula:
- C8H18O
- IUPAC Name:
- 2-ethylhexan-1-ol
- Details on test material:
- - Analytical purity: not speciifed
- Specific activity (if radiolabelling): not speciifed
- Locations of the label: 2-ethyl[1-14C]hexan-1-ol
Constituent 1
- Radiolabelling:
- yes
- Remarks:
- [14]C
Test animals
- Species:
- rat
- Sex:
- male
- Details on test animals or test system and environmental conditions:
- TEST ANIMALS
- Weight at study initiation: 300 g
- Individual metabolism cages: not speciifed
- Diet: ad libitum
- Water: ad libitum
Administration / exposure
- Route of administration:
- oral: gavage
- Vehicle:
- other: cottonseed oil, 0.4 mL
- Details on exposure:
- PREPARATION OF DOSING SOLUTIONS:
Low dose: 1µCi, 8.8 µg of labelled [14C]-2-EH dissolved in 0.4 mL cottonoil seed
High dose: 1µCi, 8.8 µg of labelled [14C]-2-EH dissolved in 0.4 mL cottonoil seed, additionally 0.1 ml (83.3 mg) of unlabeled 2-EH.
VEHICLE
- Amount of vehicle (if gavage): 0.4 mL
- Duration and frequency of treatment / exposure:
- Single dose
Doses / concentrations
- Remarks:
- Doses / Concentrations:
Low dose: 29 µg/kg bw labeleld 2-EH
High dose: 278 mg/kg bw unlabelled 2-EH
- No. of animals per sex per dose / concentration:
- 2 male rats per dose level
- Control animals:
- no
Results and discussion
Toxicokinetic / pharmacokinetic studies
- Details on excretion:
- 1) there were no differences between the low dose (27 µg/kg bw) and the high dose ( 278 mg/kg bw) regarding absorption, metabolism, and excretion
2) excreta
CO2: radioactivity reached a peak in less than 2 hours, logarithmic decrease witzh t1/2= 3.5 hrs
Faeces: nearl ycomplete within 20 hrs; a total of 8.6% of the administered dose eliminated by this route.
Urine: 25% were excreted within 8 to 10 hrs, approx. 80% after 28 hrs
Total: 96.1% were excreted after 28 hrs. Cage wash accounted for 2.7%. Only 1.4% was found in the carcasses.
Metabolite characterisation studies
- Metabolites identified:
- yes
- Details on metabolites:
- Identiifed metabolites:
2- heptanone, 4-heptanone, CO2.
2-ethyl5-hydroxyhexanoic acid, 2-ethyl-5-keto-hexanoic acid, 2-ethyl-1,6-hexanedioic acid.
unchanged 2-ethylhexanol approx. 3%
Any other information on results incl. tables
(1) 2-Ethylhexanol was efficiently absorbed following oral
administration to rats. 14C associated with
2-ethyl[1-14C]-hexanol was rapidly excreted in respiratory
CO2 (6-7%), faeces (8-9%) and urine (80-82%), with
essentially complete elimination by 28 h after
administration.
(2) The amount of label recovered in CO2 matched the amount of
unlabelled 2-heptanone plus 4-heptanone recovered from
urine, suggesting that both types of metabolites may have
been derived from the major urinary metabolite,
2-ethylhexanoix acid, by decarboxylation following partial
beta-oxidation. The 14CO2 appeared not to be derived from
acetate or by reductive decarboxylation.
Excretion of [14-C] within 28 hrs after oral administration to rats (% of dose) |
|
CO2 |
6-7 |
Urine |
80-82 |
Faeces |
8-9 |
Total excreted |
96.1 |
Cage wash |
2.7 |
Carcass |
1.4 |
(3) Other identified metabolites were 2-ethyl-5-hydroxyhexanoic
acid, 2-ethyl-5-ketohexanoic acid, and 2-ethyl-1,6-hexene-
dioic acid. Only about 3% of the ethylhexanol was excreted
unchanged.
(4) Ethylhexanol was a competitive inhibitor of yeast alcohol
dehydrogenase, but a good substrate for the mammalian horse alcohol
dehydrogenase.
(5) Metabolic pathways were suggested as follows:
(i) first step: oxidation of 2-ethyl-hexanol via alcohol dehydrogenase and aldehyde dehydrogenase to 2-ethyl-hexanoic acid (2-EHA)
(iia) omega-oxidation of 2-EHA, leading to the di-acid
(iib) omega-1 -oxidation of 2-EHA, leading to 5-hydroxy and 5-keto-2-ethylhexanoic acid
(iic) ß-oxidation, leading to the 2-keto- and 4-keto-pentanones and CO2.
Applicant's summary and conclusion
- Conclusions:
- 2-EH was rapidly absorbed, metabolised, and excreted mainly via urine within 28 hours after oral administartion to rats. Accumulation of 2-EH or its metabolites is unlikely to occur.
- Executive summary:
2-Ethylhexanol was efficiently absorbed following oral administration to rats. 14C associated with 2-ethyl[1-14C]-hexanol was rapidly excreted in respiratory CO2 (6-7%), faeces (8-9%) and urine (80-82%), with essentially complete elimination by 28 h after administration. There was no difference between the low or high dose (9 µg/kg bw and 278 mg/kg bw, resp.). The major metabolite is 2-ethylhexanoic acid, which appears in urine; alternatively it may also be further metabolised by either ß-oxidation or omega and omega-1 oxidation. Only 3% of the 2-ethylhexanol are excreted unchanged.
Overall, 2-EH was rapidly absorbed, metabolised, and excreted mainly via urine within 28 hours following the oral administration to rats. Accumulation of 2-EH or its metabolites is unlikely to occur (Albro, 1975).
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