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EC number: 905-964-4 | 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
Basic toxicokinetics
Administrative data
- Endpoint:
- basic toxicokinetics in vivo
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Acceptable, well documented publication which meets basic scientific principles.
Data source
Reference
- Reference Type:
- publication
- Title:
- Metabolism of triacetin-derived acetate in dogs
- Author:
- Bleiberg, B.
- Year:
- 1 993
- Bibliographic source:
- Am J Clin Nutr 58:908-11.
Materials and methods
- Objective of study:
- toxicokinetics
- Principles of method if other than guideline:
- Triacetin was administered intravenously to ten mongrel dogs 2 weeks after surgical placement of blood-sampling catheters in the aorta and in the portal, hepatic, renal, and femoral veins. [1-14C] Acetate was infused to allow quantification of organ uptake of acetate as well as systemic turnover and oxidation.
- GLP compliance:
- no
Test material
- Reference substance name:
- Triacetin
- EC Number:
- 203-051-9
- EC Name:
- Triacetin
- Cas Number:
- 102-76-1
- Molecular formula:
- C9H14O6
- IUPAC Name:
- propane-1,2,3-triyl triacetate
- Details on test material:
- - Name of test material (as cited in study report): Triacetin
- Analytical purity: no data
Constituent 1
- Radiolabelling:
- yes
- Remarks:
- [1-14C] Acetate
Test animals
- Species:
- dog
- Strain:
- other: Mongrel
- Sex:
- not specified
- Details on test animals or test system and environmental conditions:
- TEST ANIMALS
- Weight at study initiation: 23.4 ± 0.3 kg
Administration / exposure
- Route of administration:
- infusion
- Vehicle:
- water
- Details on exposure:
- Triacetin was administered intravenously to mongrel dogs (n=10) 2 weeks after surgical placement of blood-sampling catheters
in the aorta and in the portal, hepatic, renal, and femoral veins. A 18-gauge infusion catheter was inserted in the postcava via a lateral saphenous vein for subsequent tracer infusion. A tracer was diluted in 150 mmol NaCl/L containing 2 mmol NaHCO/L before infusion. After 3 h of tracer infusion, a 5% (v/v) aqueous solution of triacetin was infused at a rate of 47 µmol/kg/min and continued for an additional 4 h. [1-14C] acetate was infused to alow quantification of organ uptake of acetate as well as systemic turnover and oxidation. - Duration and frequency of treatment / exposure:
- 3 h tracer infusion
4 h infusion of aqueous triacetin solution at 47 µmol/kg bw/min
Doses / concentrations
- Remarks:
- Doses / Concentrations:
47 µmol/kg bw/min
- No. of animals per sex per dose / concentration:
- 10
- Control animals:
- no
- Details on study design:
- Plasma acetate concentration and specific activity were determined by HPLC with [3H] acetate used as an internal standard.
The same procedure was used to determine the specific activity of D-beta-hydroxybutyrate.
The 14CO2 excretion rate was measured by using an ethanolamine trap.
Hematocrit values were obtained on all animals. - Details on dosing and sampling:
- PHARMACOKINETIC STUDY (Absorption, distribution, excretion)
- Tissues and body fluids sampled: blood, plasma, breath
- Time and frequency of sampling: Blood samples were obtained from all five catheters at 15-min intervals over the last 30 min of the Triacetin infusion for measurement of plasma acetate concentration and specific activity. Breath samples were obtained at the same time points for determination of 14CO2 excretion rate.
- Statistics:
- Average values for plasma acetate concentration and specific activity, mean values for 14CO2 excretion rate for breath samples were evaluated.
Systemic acetate turnover and oxidation were determined by using steady-state formulas.
Results and discussion
Toxicokinetic / pharmacokinetic studies
- Details on distribution in tissues:
- Significant acetate uptake was demonstrated in all tissues (liver, 559 ± 68; intestine, 342 ± 23; hindlimb, 89 ± 7; and kidney, 330 ± 37 µmol/min).
- Details on excretion:
- Acetate clearance during Triacetin infusion 2.0 L/min.
Metabolite characterisation studies
- Metabolites identified:
- yes
- Details on metabolites:
- During intravenous administration in dogs, the majority of infused Triacetin undergoes intravascular hydrolysis, and the majority of the resulting acetate is oxidized. Systemic acetate turnover accounted for approximately 70% of (equivalent to 2214±95 µmol/min) Triacetin-derived acetate, assuming complete hydrolysis of the triglyceride. Approximately 80% of systemic acetate uptake was rapidly oxidized. It is apparent that the majority (85% equivalent to 1876±132 µmol/min) of acetate entering the system is directly oxidized. This is consistent with the generally accepted view that medium- and short-chain fatty acids undergo near quantitative oxidation rather than re-esterification or elongation.
Any other information on results incl. tables
Table 1. Average organ acetate uptake in dogs, postabsorptively.
|
Uptake μmol/min |
Hindlimb |
89 |
Total skeletal muscle* |
445 |
Intestine |
342 |
Liver |
559 |
Kidney |
330 |
* Assumption: 20% of whole-body skeletal muscle is represented in the hindlimb.
Table 2.
Plasma acetate concentration after steady-state conditions were achieved
(µmol/L):
Plasma acetate concentration |
[µmol/L] |
Aorta |
1180 |
Renal vein |
935 |
Portal vein |
817 |
Femoral vein |
752 |
Hepatic vein |
473 |
Applicant's summary and conclusion
- Conclusions:
- Interpretation of results (migrated information): low bioaccumulation potential based on study results
During intravenous administration in dogs, the majority of infused triacetin undergoes intravascular hydrolysis.
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