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Diss Factsheets
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EC number: 201-070-7 | CAS number: 77-93-0
- 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)
Basic toxicokinetics
Administrative data
- Endpoint:
- basic toxicokinetics in vitro / ex vivo
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: acceptable publication which meets basic scientific principles
Data source
Reference
- Reference Type:
- publication
- Title:
- Kurze Wissenschaftliche Mitteilung zum Stoffwechsel von Triäthylcitrat und Acetyltriäthylcitrat
- Author:
- Bruns, F.H. and Werners, H.P.
- Year:
- 1 962
- Bibliographic source:
- Klinische Wochenschrift, Jg 40, Heft 22, 15.November 1962
Materials and methods
- Objective of study:
- metabolism
Test guideline
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- It was investigated, whether triethyl citrate and triethyl-O-acetylcitrate are hydrolysed by a) liver homogenates and b) blood serum.
- GLP compliance:
- no
Test material
- Reference substance name:
- Triethyl citrate
- EC Number:
- 201-070-7
- EC Name:
- Triethyl citrate
- Cas Number:
- 77-93-0
- Molecular formula:
- C12H20O7
- IUPAC Name:
- triethyl citrate
- Reference substance name:
- trietyl-O-acetylcitrate
- IUPAC Name:
- trietyl-O-acetylcitrate
- Reference substance name:
- Triethyl O-acetylcitrate
- EC Number:
- 201-066-5
- EC Name:
- Triethyl O-acetylcitrate
- Cas Number:
- 77-89-4
- Molecular formula:
- C14H22O8
- IUPAC Name:
- triethyl 2-acetoxypropane-1,2,3-tricarboxylate
- Test material form:
- other: liquid
- Details on test material:
- - Name of test material (as cited in study report): triäthylcitrat, acetyltriäthylcitrat
- Substance type: organic / tricarbocylic ester
- Physical state: liquid
Constituent 1
Constituent 2
Constituent 3
- Radiolabelling:
- no
Test animals
- Species:
- other: not applicable as in vitro test was performed - human serum and human, rat and mouse liver homogenates
- Strain:
- other: not applicable
- Details on test animals or test system and environmental conditions:
- not applicable
Administration / exposure
- Route of administration:
- other:
- Vehicle:
- not specified
- Details on exposure:
- The enzymatic hydrolysis was measured as the enzymatic turnover of the reaction product of ethanol with alcohol dehydrogenase (ADH) and Diphosphopyridinnucleotid (DPN) photo-optically. In addition, the formation of acid valences was monitored by measuring the hydrogen ion concentration with the glass electrode. As enzyme solution, aqueous solutions of liver homogenates and blood serum were used.
- Duration and frequency of treatment / exposure:
- not applicable
Doses / concentrations
- Remarks:
- Doses / Concentrations:
not applicable
- No. of animals per sex per dose / concentration:
- not applicable
- Control animals:
- other: not applicable
- Positive control reference chemical:
- not applicable
- Details on study design:
- not applicable
- Details on dosing and sampling:
- not applicable
- Statistics:
- no data
Results and discussion
- Preliminary studies:
- no data
Main ADME resultsopen allclose all
- Type:
- metabolism
- Results:
- The esters triethyl citrate and triethyl-O-acetyl-citrate are hydrolysed by liver homogenate of human, rat and mouse origin, and by blood serum.
- Type:
- metabolism
- Results:
- Per mole of triethyl citrate 1 mol of citric acid and 3 moles of ethanol are formed during complete hydrolysis.
- Type:
- metabolism
- Results:
- Per mole of triethyl-O-acetylcitrate 1 mol of citric acid, 3 moles of ethanol and 1 mol off acetic acid are formed during complete hydrolysis.
Toxicokinetic / pharmacokinetic studies
- Details on absorption:
- not applicable
- Details on distribution in tissues:
- not applicable
- Details on excretion:
- not applicable
Metabolite characterisation studies
- Metabolites identified:
- yes
- Details on metabolites:
- Per mole of triethyl citrate 1 mol if citric acid and 3 moles of ethanol are formed during complete hydrolysis. In case of triethyl-O-acetylcitrate a further 1 mol of acetic acid is build. These three metabolites are known to appear in intermediary metabolism, where they are oxidised in well-defined paths in the organism to CO2 and H20.
Any other information on results incl. tables
triethyl citrate concentration | relative activity - human Serum |
3* 10E-2 | 1 |
2* 10E-2 | 0,66 |
1* 10E-2 | 0,5 |
5* 10E-3 | 0,38 |
The affinity of triethyl-O-acetyl to the
enzyme is lower than that of triethyl citrate. The hydrolysis curve
shows an exponential course and the reaction rate is accelerated by the
extent that the acetyl group is cleaved.
The question which of the known esterases catalyses the enzymatic
hydrolysis of triethyl citrate and triethyl-O-acetyl is not easy to
answer. The liver esterase, which is also present in the blood serum,
seems not to be responsible for this. The pH optimum of the hydrolysis
is 9.0, a property that characterizes the pancreatic lipase. Also the
fact that chinine inhibits the hydrolysis of triethyl citrate at a
concentration of 1 *10E-3m to 15% and twice the concentration inhibits
to 30%, while atoxyl is without influence, speaks for the preference of
triethyl citrate and triethyl-O-acetyl to the lipase. A decision of this
question is possible only on the basis of studies on homogeneous enzyme
preparations.
Applicant's summary and conclusion
- Conclusions:
- Interpretation of results (migrated information): bioaccumulation potential cannot be judged based on study results
This publication on the hydrolysis potential of triethyl citrate and triethyl-O-acetylcitrate was conducted using an in in vitro approach with liver homogenates and blood serum. Therefore no guideline has to be / was followed. The validity of the experiments is judged to be given. The esters triethyl citrate and triethyl-O-acetyl-citrate, used as plasticizers, are hydrolysed by liver homogenate of human, rat and mouse origin, and by blood serum to citric acid and ethanol or acetic acid, citric acid and ethanol, respectively. - Executive summary:
The substance of interest triethyl citrate (TEC) and additionally triethyl-O-acetylcitrate (ATEC) were subject to an investigation of their potential to hydrolyse in vitro (Bruns and Werners, 1959). It was investigated, whether triethyl citrate and triethyl-O-acetylcitrate are hydrolysed by a) liver homogenates and b) blood serum. The esters triethyl citrate and triethyl-O-acetyl-citrate, used as plasticizers, are hydrolysed by liver homogenate of human, rat and mouse origin, and by blood serum to citric acid and ethanol or acetic acid, citric acid and ethanol, respectively. Per mole of triethyl citrate 1 mol if citric acid and 3 moles of ethanol are formed during complete hydrolysis. In case of triethyl-O-acetylcitrate a further 1 mol of acetic acid is build. These three metabolites are known to appear in intermediary metabolism, where they are oxidized in well-defined paths in the organism to CO2 and H20.
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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