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EC number: 222-423-1 | CAS number: 3467-59-2
- 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
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: well performed GLP and OECD guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 011
- Report date:
- 2011
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
- Type of study:
- mouse local lymph node assay (LLNA)
Test material
- Reference substance name:
- N-(2,5-dimethoxyphenyl)acetamide
- EC Number:
- 222-423-1
- EC Name:
- N-(2,5-dimethoxyphenyl)acetamide
- Cas Number:
- 3467-59-2
- Molecular formula:
- C10H13NO3
- IUPAC Name:
- N-(2,5-dimethoxyphenyl)acetamide
- Details on test material:
- - Name of test material (as cited in study report): Acetchinonbase (2,5-Dimethoxyacetanilid)
Constituent 1
In vivo test system
Test animals
- Species:
- mouse
- Strain:
- other: CBA/CaOlaHsd
- Sex:
- female
- Details on test animals and environmental conditions:
- TEST ANIMALS:
- Source: Harlan Laboratories B.V., Postbus 6174, 5960 AD Horst / The Netherlands
- Age at study initiation: 8 - 9 weeks
- Weight at study initiation: 18.0 - 21.0 g
- Housing: group
- Cage Type: Makrolon Type II / III, with wire mesh top
- Diet: pelleted standard diet (Harlan Laboratories), ad libidum
- Water: tap water, ad libitum
- Acclimation period: At least 5 days prior to the start of dosing under test conditions after health examination.
ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22 + 2
- Humidity (%): 45-65
- Photoperiod (hrs dark / hrs light): 12/12
Study design: in vivo (LLNA)
- Vehicle:
- acetone/olive oil (4:1 v/v)
- Concentration:
- 0, 5, 10 and 25%
- No. of animals per dose:
- 4
- Details on study design:
- RANGE FINDING TESTS:
A solubility experiment was performed according to the recommendations given by OECD 429. The highest test item concentration, which could be technically used was a 25 % (w/v) solution in acetone:olive oil (4+1 v/v). Vortexing and sonicating were used to formulate the test item. At higher concentrations, an applicable formulation of the test item was not achieved, neither by the use of other vehicles nor by using additional methods to formulate the test item (e.g. warming to 37°C or sonicating).
To determine the highest non-irritant test concentration that at the same time did not induce signs of systemic toxicity, a pre-test was performed in two animals and stated in raw data and report. Two mice were treated by (epidermal) topical application to the dorsal surface of each ear with test item concentrations of 10 and 25% once daily each on three consecutive days. Prior to the first application of the test item and before sacrifice the body weight was determined. Clinical signs were recorded at least once daily. Eventual signs of local irritation were documented and a score was used to grade a possible reddening of the ear skin. Furthermore, prior to the first application of the test item (day 1), on day 3 and before sacrifice (day 6) the ear thickness was determined using a micrometer (S0247 Kroeplin, 36381 Schlüchtern, Germany). Additionally, for both animals, the ears were punched after sacrifice (day 6) at the apical area using a biopsy punch (Stiefel, Ø 8 mm corresponding to 0.5 cm2) and were immediately pooled per animal and weighed using an analytical balance.
Eventual ear irritation was considered to be excessive if reddening of the ear skin of a score value ≥3 was observed at any observation time and/or if an increase in ear thickness of ≥25% was recorded on day 3 or day 6. The measured ear weight was also considered in this evaluation.
At the tested concentrations the animals did not show any signs of systemic toxicity. Only on day 5 of the pre-test, an erythema of the ear skin (Score 1 = very slight erythema) and flaky ear skin was observed in both animals.
MAIN STUDY:
TOPICAL APPLICATION:
Each test group of mice was treated by topical (epidermal) application to the dorsal surface of each ear (left and right) with different test item concentrations of 5, 10 and 25% (w/w) in acetone/olive oil (4:1). The application volume, 25 µL was spread over the entire dorsal surface (ø~8 mm) of each ear once daily for three consecutive days. A further group of mice was treated with an equivalent volume of the relevant vehicle alone (control animals).
ADMINISTRATION OF 3H-METHYL THYMIDINE AND DETERMINATION OF INCORPORATED 3H-METHYL THYMIDINE
Five days after the first topical application, all mice were intraveneously injected into a tail vein with radio-labelled thymidine (3HTdR). Approximately five hours after treatment with 3HTdR all mice were sacrificed and the draining lymph nodes were excised and pooled per group. Single cell suspensions of lymph node cells were prepared from pooled lymph nodes, which were subsequently washed with phosphate buffered saline and incubated with trichloroacetíc acid overnight. The proliferative capacity of pooled lymph node cells was determined by the incorporation of 3H-methyl thymidine measured in a ß-scintillation counter.
INTERPRETATION OF RAW DATA
The proliferation response of lymph node cells is expressed as the number of radioactive disintegrations per minute per lymph node (DPM/node) and as the ratio of 3HTdR incorporated into lymph node cells of test lymph nodes relative to that recorded for control lymph nodes (stimulation index). Before DPM/node values were determined, mean scintillation-background DPM was subtracted from test and control raw data. A test item is regarded as a sensitiliser in the LLNA if the following criteria are fulfilled:
-First, that exposure to at least one concentration of the test item resulted in an incorporation of 3HTdR at least 3-fold or greater than that recorded in control mice, as indicated by the stimulation index.
-Second, that the data are compatible with a conventional dose response, although allowance must be made (especially at high topical concentrations) for either local toxicity or immunological suppression.
OBSERVATIONS
In addition to the sensitising reactions the following observations and data were recorded during the test and observation period:
Mortality / Viability At least once daily from experimental start to necropsy.
Body weights In the pre-test prior to the first application and prior to sacrifice. In the main experiment: prior to the first application and prior to treatment with 3HTdR.
Ear thickness: In the pre-test prior to the first application of the test item (day 1), on day 3 and before sacrifice (day 6).
Ear weights: In the pre-test and main test after sacrifice; biopsy punches were taken from each ear.
Clinical signs (local / systemic): Clinical signs (systemic toxicity or local skin irritation) were recorded at least once daily. Especially the treatment sites were observed carefully. - Positive control substance(s):
- hexyl cinnamic aldehyde (CAS No 101-86-0)
- Statistics:
- The mean values and standard deviations were calculated in the body weight tables.
The ANOVA (Dunnett-test) was conducted on the ear weights to assess whether the difference was statistically significant between test item groups and negative control (vehicle) group. For all statistical calculations SigmaStat for Windows (Version 2.0) was used. A One-Way-Analysis-of-Variance was used as statistical method. In case of significant results of the One-Way-ANOVA, multiple comparisons were performed with the Dunnett test. However, both biological and statistical significance were considered together.
Results and discussion
- Positive control results:
- Experiment performed in May 2011 using concentrations of 5, 10, and 25 % alpha-hexyl cinnamic aldehyde in acetone:olive oil (4:1). These concentrations yielded S.I.´s of 1.30, 2.82, and 9.03, respectively.
The EC3 value calculated was 10.4 % (w/v).
The positive control substance alpha-hexyl cinnamic aldehyde was found to be a skin sensitizer under the described conditions, demonstrating the validity of the study.
In vivo (LLNA)
Resultsopen allclose all
- Parameter:
- SI
- Remarks on result:
- other: S.I. at 0 % (w/v): 1.00 S.I. at 5 % (w/v): 1.37 S.I. at 10 % (w/v): 1.25 S.I. at 25 % (w/v): 1.60
- Parameter:
- other: disintegrations per minute (DPM)
- Remarks on result:
- other: 0 % (w/v): 392.1 DPM per lymph node 5 % (w/v): 537.7 DPM per lymph node 10 % (w/v): 488.2 DPM per lymph node 25 % (w/v): 625.8 DPM per lymph node
Any other information on results incl. tables
VIABILITY / MORTALITY
No deaths occurred during the study period.
CLINICAL SIGNS
No symtoms of local toxicity at the ears of the animals and no systemic findings were observed during the study period.
BODY WEIGHTS
The body weight of the animals, recorded prior to the first application and prior to treatment with 3HTdR, was within the range commonly recorded for animals of this strain and age.
EAR WEIGHTS
The measured ear weight of all animals treated was recorded on day 6 after necropsy. A statistically significant increase in ear weight was seen in the high dose group in comparison to the vehicle control group (p < 0.05).
Applicant's summary and conclusion
- Interpretation of results:
- not sensitising
- Remarks:
- Migrated information Criteria used for interpretation of results: expert judgment
- Conclusions:
- The test item Acetchinonbase (2,5-Dimethoxyacetanilid) was not a skin sensitiser under the test conditions of this study.
- Executive summary:
In the study the test item Acetchinonbase (2,5-Dimethoxyacetanilid) dissolved in acetone:olive oil (4+1 v/v) was assessed for its possible contact allergenic potential according to OECD guideline 429.
For this purpose a local lymph node assay was performed using test item concentrations of 5, 10 and 25%. The highest concentration tested was the highest concentration that could be achieved whilst avoiding systemic toxicity and excessive local skin irritation as confirmed by a pre-experiment.
The animals did not show any signs of systemic toxicity or local skin irritation during the course of the study and no cases of mortality were observed.
In this study Stimulation Indices (S.I.) of 1.37, 1.25, and 1.60 were determined with the test item at concentrations of 5, 10, and 25% in acetone:olive oil (4+1 v/v), respectively.
The test item Acetchinonbase (2,5-Dimethoxyacetanilid) was not a skin sensitiser under the test conditions of this study.
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