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EC number: 662-772-0 | CAS number: 25601-41-6
- 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:
- 10 January 2012 to 24 January 2012
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: GLP guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 012
- Report date:
- 2012
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 429 (Skin Sensitisation: Local Lymph Node Assay)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method B.42 (Skin Sensitisation: Local Lymph Node Assay)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of study:
- mouse local lymph node assay (LLNA)
Test material
- Reference substance name:
- methyl dec-9-enoate
- EC Number:
- 662-772-0
- Cas Number:
- 25601-41-6
- Molecular formula:
- C11H20O2
- IUPAC Name:
- methyl dec-9-enoate
- Details on test material:
- - Name of test material (as cited in study report): 9-decenoic acid, methyl ester (9DAME)
- Physical state: Clear colourless liquid
- Analytical purity: 99%
- Lot/batch No.: 184-109
- Date received: 2011-04-01
- Storage conditions: room temperature in the dark under nitrogen
Constituent 1
In vivo test system
Test animals
- Species:
- mouse
- Strain:
- other: CBA/Ca
- Sex:
- female
- Details on test animals and environmental conditions:
- TEST ANIMALS
- Source: Harlan Laboratories UK Ltd., Oxon, UK
- Age at study initiation: 8 - 12 weeks
- Weight at study initiation: 15 - 23 g
- Housing: The animals were individually housed in suspended solid-floor polypropylene cages furnished with softwood woodflakes.
- Diet: 2014C Teklad Global Rodent diet available ad libitum
- Water: Tap water available ad libitum
- Acclimation period: at least 5 days
ENVIRONMENTAL CONDITIONS
- Temperature: 19 - 25 °C
- Humidity: 30 - 70%
- Air changes: 15 changes per hour
- Photoperiod: 12 hrs dark / 12 hrs light
Study design: in vivo (LLNA)
- Vehicle:
- acetone/olive oil (4:1 v/v)
- Remarks:
- This vehicle was chosen as it produced the most suitable formulation at the required concentration.
- Concentration:
- 25%, 50% and 100% v/v in acetone/olive oil 4:1.
- No. of animals per dose:
- 4 animals per dose
- Details on study design:
- RANGE FINDING TESTS:
- A preliminary screening test was performed using one mouse. The mouse was treated by daily application of 25 μL of the undiluted test item to the dorsal surface of each ear for three consecutive days.
- Irritation: Very slight erythema was noted on both ears on Days 2 and 3. No signs of systemic toxicity or irritation indicated by an equal to or greater than 25% increase in mean ear thickness were noted.
MAIN STUDY
ANIMAL ASSIGNMENT AND TREATMENT
- Criteria used to consider a positive response: The proliferation response of lymph node cells was expressed as the number of radioactive disintegrations per minute per lymph node (disintegrations per minute/node) and as the ratio of 3HTdR incorporation into lymph node cells of test nodes relative to that recorded for the control nodes (Stimulation Index).
The test item will be regarded as a sensitiser if at least one concentration of the test item results in a threefold or greater increase in 3HTdR incorporation compared to control values. Any test item failing to produce a threefold or greater increase in 3HTdR incorporation will be classified as a "non-sensitiser".
TREATMENT PREPARATION AND ADMINISTRATION:
- The mice were treated by daily application of 25 μL of the appropriate concentration of the test item to the dorsal surface of each ear for three consecutive days (Days 1, 2, 3). The test item formulation was administered using an automatic micropipette and spread over the dorsal surface of the ear using the tip of the pipette.
- A further group of four mice received the vehicle alone in the same manner.
- Five days following the first topical application of the test item or vehicle (Day 6) all mice were injected via the tail vein with 250 μL of phosphate buffered saline (PBS) containing 3H-methyl thymidine (3HTdR: 80 μCi/mL, specific activity 2.0 Ci/mmol) giving a total of 20 μCi to each mouse.
- Clinical Observations: All animals were observed twice daily on Days 1, 2 and 3 and on a daily basis on Days 4, 5 and 6. Any signs of toxicity or signs of ill health during the test were recorded.
- Bodyweights: The bodyweight of each mouse was recorded on Day 1 (prior to dosing) and Day 6 (prior to termination). - Positive control substance(s):
- hexyl cinnamic aldehyde (CAS No 101-86-0)
Results and discussion
- Positive control results:
- The stimulation index was 4.05. Therefore, α-Hexylcinnamaldehyde, tech., 85% was considered to be a sensitiser under the conditions of the test.
In vivo (LLNA)
Resultsopen allclose all
- Parameter:
- SI
- Value:
- 1.61
- Test group / Remarks:
- 25% v/v in vehicle
- Parameter:
- SI
- Value:
- 3.02
- Test group / Remarks:
- 50% v/v in vehicle
- Parameter:
- SI
- Value:
- 2.42
- Test group / Remarks:
- 100%
Any other information on results incl. tables
An expert review of these study results was provided by Dr. David Basketter. Dr. Basketter's expert rerpot is attached.
CLINICAL OBSERVATIONS AND MORTALITY DATA
Mild redness on the ears and neck was noted, post Days 2 and 3, in animals treated with the undiluted test item at a concentration 50 % v/v in acetone/olive oil 4:1. There were no deaths. No signs of systemic toxicity were noted in the test or control animals during the test.
BODYWEIGHT
Bodyweight changes of the test animals between Day 1 and Day 6 were comparable to those observed in the corresponding control group animals over the same period.
Table 1: Disintegrations per Minute, Disintegrations per Minute/Node and Stimulation Index
Concentration (% v/v) in acetone/olive oil 4:1 |
dpm |
Dpm/ Nodea |
Stimulation Indexb |
Vehicle |
12665.97 |
1583.25 |
n/a |
25 |
20382.35 |
2547.79 |
1.61 |
50 |
38258.42 |
4782.30 |
3.02 |
100 |
30617.01 |
3827.13 |
2.42 |
dpm = Disintegrations per minute
a= Disintegrations per minute/node obtained by dividing the disintegrations per minute value by 8
(total number of lymph nodes)
b= Stimulation Index of 3.0 or greater indicates a positive result
na = Not applicable
Applicant's summary and conclusion
- Interpretation of results:
- other: not-sensitising
- Conclusions:
- The test item returned a borderline response under the conditions of the test. An expert review of these study results (Basketter, 2012) indicated that 9-decenoic acid, methyl ester (9DAME) does not contain any structural alerts for reactivity associated with skin sensitisation and is a long chain unsaturated fatty acid. Published work has indicated that unsaturated fatty acids have the potential to generate false positive results in the LLNA. Several long chain unsaturated fatty acids, such as oleic acid, have proven to be positive in the LLNA but were clear negatives in guinea pig maximisation test conducted in parallel, an outcome which was consistent with their absence of skin sensitising effects in humans.
Based upon the above considerations, the very borderline nature of the single positive result and the absence of a dose response in this test it is feasible that a false positive result may have been obtained and hence 9-decenoic acid, methyl ester (9DAME) is not considered to be a skin sensitiser.
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