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EC number: 816-856-0 | CAS number: 5205-01-6
- 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
Skin sensitisation
Administrative data
- Endpoint:
- skin sensitisation: in vivo (LLNA)
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2015-11-11 to 2016-05-31
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 016
- Report date:
- 2016
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 429 (Skin Sensitisation: Local Lymph Node Assay)
- Version / remarks:
- 2010
- GLP compliance:
- yes (incl. QA statement)
- Type of study:
- mouse local lymph node assay (LLNA)
Test material
- Reference substance name:
- 3-methyl-1,3-butanediol-1-ethylate
- EC Number:
- 816-856-0
- Cas Number:
- 5205-01-6
- Molecular formula:
- C7H14O3
- IUPAC Name:
- 3-methyl-1,3-butanediol-1-ethylate
Constituent 1
- Specific details on test material used for the study:
- Batch number: IPDAC-63313
Purity: 96.0%
Expiry date: 30 March 2016
Storage conditions: Room temperature in the dark, under nitrogen
In vivo test system
Test animals
- Species:
- mouse
- Strain:
- CBA/Ca
- Sex:
- female
- Details on test animals and environmental conditions:
- Acclimatisation period: 5 days
Weight at start of study: 15-23 g
Age at start of study: 8-12 weeks
Temperature: 19-25°C
Relative humidity: 30-70%
Air exchanges: 15 changes/hour
Photoperiod: 12 hour light/dark cycle
Food: 2014C Teklad Global Rodent diet; ad libitum
Water: Mains tap water; ad libitum
Caging: Suspended solid floor polypropylene cage
Study design: in vivo (LLNA)
- Vehicle:
- acetone/olive oil (4:1 v/v)
- Concentration:
- Undiluted (100%), 50% or 25%
- No. of animals per dose:
- Four
- Details on study design:
- PRE-SCREEN TESTS:
One mouse was treated by daily application of 25 µL of undiluted test item to the dorsal surface of each ear for three consecutive days (Days 1, 2 and 3). Local skin irritation was recorded daily on Days 1 to 6. The ear thickness was measured pre-dose on Day 1, post dose on Day 3 and again on Day 6.Change in ear thickness was determined and a change of =>25% was considered to be excessive irritation.
MAIN STUDY
Groups of four mice were treated with undiluted test item, 50% or 25% concentrations in acetone:olive oil (4:1), or the vehicle alone. The mice were treated with by daily application of 25 µL of test substance or control to the dorsal surface of each ear for three consecutive days (Days 1, 2 and 3). The substance was administered by micropipette and spread over the dorsal surface of the ear using the tip of the pipette.
Five days following the first topical application (Day 6), mice were injected via the tail vein with 250 µL phosphate buffered saline contained 3H-methyl thymidine (3HTdR; 80 µCi/mL; specific activity 2.0 Ci/mmol) giving each mouse a total of 20 µCi.
Clinical observations were made twice daily on Days 1 to 3 and daily on Days 4 to 6. The body weight was recorded on Day 1 prior to dosing and on Day 6 prior to termination.
Five hours after administration of 3HTdR, the animals were euthanised. The draining auricular lymph node from the mice were excised and pooled for each group. Phosphate buffered saline (PBS) (1 mL) was added to each pooled sample. A single cell suspension was prepared by mechanical disaggregation through a 200-mesh gauze. The cells were rinsed through the gauze with 4 mL of PBS into a petri dish. The lymph nodes were transferred to a centrifuge tube and the petri dish rinsed with 5 mL of PBS which was added to the tube. The cells were centrifuged at 190 g for 10 minutes and resuspended in 10 mL of PBS and repelleted in 3 mL of 5% trichloroacetic acid.
After approximately 18 hours incubation at approximately 4°C, the precipitates were recovered by centrifugation at 450 g for 10 minutes, resuspended in 1 mL of TCA and transferred to 10 mL of scintillation fluid. The incorporation of 3HTdR was measured by ß-scintillation counting. After approximately 20 minutes in the dark, the samples were shaken and the number of radioactive disintegrations per minutes were measured.
DATA EVALUATION:
The proliferation of the lymph nodes was expressed as the number of radioactive disintegrations per minutes per lymph node (disintegrations per minutes/node) and as the ratio of 3HTdR incorporations into lymph node cells of test nodes relative to that recorded for the control nodes (Stimulation Index).
A test substance is considered to be sensitising if at least one concentration has a threefold or greater increase in 3HTdR incorporation compared to control values.
A test substance is considered to be not sensitising if there is no threefold or greater increase in 3HTdR incorporation compared to control values. - Positive control substance(s):
- not specified
- Statistics:
- None
Results and discussion
- Positive control results:
- Positive control, a-hexylcinnamaldehyde was tested previously in a separate study with the same vehicle and shown to be a sensitisier in the assay system (SI was 6.08).
In vivo (LLNA)
Resultsopen allclose all
- Parameter:
- SI
- Value:
- 1.44
- Test group / Remarks:
- 25%
- Remarks on result:
- other: No indication of skin sensitisation
- Parameter:
- SI
- Value:
- 1.6
- Test group / Remarks:
- 50%
- Remarks on result:
- other: No indication of skin sensitisation
- Parameter:
- SI
- Value:
- 1.02
- Test group / Remarks:
- 100%
- Remarks on result:
- other: No indication of skin sensitisation
Any other information on results incl. tables
Disintegrations per minute, disintegrations per minute/node and Stimulation Index
Concentration (%v/v) in acetone:olive oil (4:1) |
Disintegrations per minute |
Disintegrations per minute/node |
Stimulation Index |
Result |
Vehicle control |
2513.87 |
314.23 |
N/A |
N/A |
25 |
3628.08 |
453.51 |
1.44 |
Negative |
50 |
4013.47 |
501.68 |
1.60 |
Negative |
100 |
2561.86 |
320.23 |
1.02 |
Negative |
Applicant's summary and conclusion
- Interpretation of results:
- GHS criteria not met
- Conclusions:
- IPD-AC is considered not to be a skin sensitisier under the conditions of this study.
- Executive summary:
A skin sensitisation study has been conducted in mice using the local lymph node assay in accordance with OCED test guideline 429 and in compliance with GLP. Groups of four mice were each treated with 50 µL (25 µL per ear) of 25%, 50% or 100% of IPD-AC. A control group of four mice were also tested with the vehicle control, acetone:olive oil at 4:1. The Stimulation Index (SI) was expressed as the mean radioactive incorporation for each treatment group divided by the mean radioactive incorporation of the vehicle control. The SI values for all the treatment groups were less than 3, indicating that the test substance is not sensitising to skin under the conditions of this study.
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