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EC number: 944-968-0 | 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
Endpoint summary
Administrative data
Description of key information
Acute Toxicity
Acute oral toxicity (rat): LD50> 2000 mg/kg bw (C10) (Cognis 1997; M. Hoyer)
Acute dermal toxicity (rat): LD50>5000 mg/kg bw (C10) (Cognis 1997; M. Hoyer)
Acute inhalative toxicity (rat): LC50 mixture of dimethylamides (mainly C8/C10): >3551 mg/m3 (Bayer 1991; J. Pauluhn)
It may be predicted from this that (analogue read-across) Ninol CAA would share a similar toxicity profile having similar LD50 or LC50 values
Key value for chemical safety assessment
Acute toxicity: via oral route
Link to relevant study records
- Endpoint:
- acute toxicity: oral
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 1997
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Study according OECD guideline, GLP, well documented
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 420 (Acute Oral Toxicity - Fixed Dose Method)
- GLP compliance:
- yes
- Test type:
- fixed dose procedure
- Limit test:
- yes
- Species:
- rat
- Strain:
- Wistar
- Sex:
- male/female
- Details on test animals or test system and environmental conditions:
- TEST ANIMALS
- Source: Tierzucht Schönwalde GmbH, Schönwalde, Germany
- Weight at study initiation: main study mean 212g male, 168g female
- Fasting period before study: 18h prior admin
- Housing: animal room 4, filtered air, transparent polycarbonate cages (macrolonge type III), two or three rats per cage
- Diet (e.g. ad libitum): Altromin 1314 (Altromin, Lage, Germany) ad libitum
- Water (e.g. ad libitum): ad libitum (acified pH=2.5 with HCl)
- Acclimation period: 15 days
ENVIRONMENTAL CONDITIONS
- Temperature (°C): 21±3°C
- Humidity (%): 55±15%
- Air changes (per hr): 10 times/h
- Photoperiod (hrs dark / hrs light): 12h each - Route of administration:
- oral: gavage
- Vehicle:
- water
- Details on oral exposure:
- VEHICLE: sterile distilled water
- Concentration in vehicle: 2g/10ml
- Amount of vehicle (if gavage): ca. 8ml
- Justification for choice of vehicle: common vehicle
- Purity: 100 %
MAXIMUM DOSE VOLUME APPLIED: 10ml/kg b.wt
CLASS METHOD (if applicable)
- Rationale for the selection of the starting dose: Sighting study show dead in the 5000mg/kg b.wt. group whereas only signs of toxicity were observerd in the 2000 mg/kg b.wt. sighting study. - Doses:
- sighting study: 5000mg/kg b.wt. (one rat), 2000mg/kg b.wt. (one rat)
main study: 2000 mg/kg b.wt. - No. of animals per sex per dose:
- main study: 5 rats per sex per dose
- Control animals:
- no
- Details on study design:
- Rats were observed 1, 3 and 6 h after administration and daily for 14 days
Body weight were recorded on day 0, 7, 14 - Statistics:
- no statistics
- Preliminary study:
- Preliminary study with one rat each for dosages of 5000mg/kg b.wt. and 2000 mg/kg b.wt. were performed.
Deads occured within the 5000mg dosing whereas signs of toxicity could be observed for the 2000mg dosing. Therefore it was decided to performe a limit test with 2000mg/kg b.wt. - Key result
- Sex:
- male/female
- Dose descriptor:
- LD50
- Effect level:
- > 2 000 mg/kg bw
- Mortality:
- Sighting study: 5000mg/kg b.wt. the animal died
2000mg/kg b.wt. the animal survived
Main study: 2000mg/kg b.wt. no increased mortality - Clinical signs:
- other: Sighting study: 5000mg/kg b.wt. pinched abdomen, piloerection, ataxia, comatose 2000mg/kg b.wt. pinched abdomen, piloerection Main study: 2000mg/kg b.wt. pinched abdomen, piloerection
- Gross pathology:
- Main study: gross necropsy revealed a gas filled intestine (three animals), distended vessel of testes in one animal, light margin of liver in two animals
- Other findings:
- not stated
- Interpretation of results:
- not classified
- Remarks:
- Migrated information Criteria used for interpretation of results: other: EU GHS EC 1272/2008
- Conclusions:
- The oral LD50 of N,N-Dimethyldecan-1-amide in rats was found to be above 2000 mg/kg b.wt.
- Executive summary:
The acute oral toxicity in rats was determined according to the method recommended in the OECD Guideline No. 420, "Acute Oral Toxicity - Fixed Dose Method", July 1992 and the corresponding EEC GuidelineB.l bis "Acute Toxicity (Oral)", 29.12.1992.
The study was initiated with a sighting study, in which one female rat was given SAT 970 419 (N,N-Dimethyldecan-1 -amide) in a 2000 mg/kg b.wt. dose. Slight signs of toxicity were observed in this rat. Another female rat was given SAT 970 419 (N,N-Dimethyldecan-1-amide) in a 5000 mg/kg b.wt. dose. This animal died under severe signs of toxicity on day 2.
On the basis of the results from the sighting study it was decided to carry out the main study with one group consisting of five male and five female rats given a dose of 2000 mg/kg b.wt.
All animals in the main study survived the treatment and showed slight signs of toxicity (clinical signs: pinched abdomen, piloerection). Gross necropsy revealed a gas filled intestine for three animals, distended vessel of testes in one animal, light margin of liver in two animals.
Under the experimental conditions described in this report, the oral LD50 of SAT 970 419 (N,N-Dimethyldecan-1-amide) in rats was found to be above 2000 mg/kg b.wt.
- Endpoint:
- acute toxicity: oral
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Justification for type of information:
- 1. HYPOTHESIS FOR THE ANALOGUE APPROACH
The read-across hypothesis proposed is that the organism is not exposed to common compounds but rather, as a result of structural similarity, that different compounds have similar toxicological and fate properties. In this case the ECHA Read-Across Assessment Framework (RAAF) Scenario 2 is used.
2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
Source: N,N-Dimethyldecanamide [ EC 238-405-1; CAS 14433-76-2]
Target: Reaction Mass of N,N-Dimethyldodecanamide and N,N-Dimethyltetradecanamide [EC not assigned; CAS not assigned]
3. ANALOGUE APPROACH JUSTIFICATION
It may be concluded that both the registered substance (target) and the source molecules can be regarded as close structural analogues having both similar physical chemical and toxicological properties. It follows that where endpoints for the registered substance may not have experimental evidence, particularly those involving animal studies, that these can be addressed by read across grouping using an analogue approach. It is therefore proposed that, after careful assessment, experimental data from the source molecules may be used as surrogate evidence for read across to the registered substance. Please refer to attached document for information on the data available to support the read-across.
4. DATA MATRIX
Please refer to attached document - Reason / purpose for cross-reference:
- read-across source
- Key result
- Sex:
- male/female
- Dose descriptor:
- LD50
- Effect level:
- 2 000 mg/kg bw
- Based on:
- test mat.
Referenceopen allclose all
Endpoint conclusion
- Endpoint conclusion:
- no adverse effect observed
- Dose descriptor:
- LD50
- Value:
- 2 000 mg/kg bw
- Quality of whole database:
- Reliability 1
Acute toxicity: via inhalation route
Link to relevant study records
- Endpoint:
- acute toxicity: inhalation
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 1991
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Study according to OECD guideline with GLP
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 403 (Acute Inhalation Toxicity)
- Deviations:
- no
- GLP compliance:
- yes
- Test type:
- standard acute method
- Limit test:
- no
- Species:
- rat
- Strain:
- Wistar
- Sex:
- male/female
- Details on test animals or test system and environmental conditions:
- TEST ANIMALS
- Source: Winkelmann/ Borchen 7 District of Paderborn / Germany
- Age at study initiation: between 2-3 months old
- Weight at study initiation: The rats had a mean starting weight of approx. 170 to 210 g.
- Fasting period before study:
- Housing: Makrolon® cages type III, 5 animals per cage
- Diet (e.g. ad libitum): ad libitum ;"Altromin" 1324 Diet for Rats and Mice
- Water (e.g. ad libitum): ad libitum; tap water
- Acclimation period: at least 4 days until the start of the treatment
ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22° ± 2 °C
- Humidity (%): approx. 50 %
- Air changes (per hr): approx. 10 times per hour
- Photoperiod (hrs dark / hrs light): 12-hour artificial lighting from 06.00 to 18.00 hrs GET - Route of administration:
- inhalation: aerosol
- Type of inhalation exposure:
- nose/head only
- Vehicle:
- other: unchanged for high concentration; mixture with polyethylene glycol 400 - ethanol for low concentrations
- Details on inhalation exposure:
- GENERATION OF TEST ATMOSPHERE / CHAMBER DESCRIPTION
- Exposure apparatus: The aerosol was sprayed under dynamic conditions into a cylindrical inhalation chamber with baffle
- Exposure chamber volume: The PVC inhalation chamber had the following dimensions: diameter = 30 cm, height = 28 cm (volume: approx. 20 liters)
- Source and rate of air/Method of conditioning air: The compressed air was produced with two in-parallel Boge compressors type SB 270/15/350D. The air was fully conditioned automatically by an in-line VIA compressed air dryer type A 110, i.e. water, dust and oil were removed.
- System of generating aerosols:The aerosol was generated by means of a nozzle (combination nozzle, Rhema Labortechnik Co.) and conditioned compressed air. A nominal 200 pi spray solution/10 liters air per min (dispersion pressure approx. 600 kPa) was nebulized under dynamic conditions into the baffle of the inhalation chamber.
- Method of particle size determination: Particle analysis was performed with an aerodynamic particle sizer with laser velocimeter (TSI-APS 3300)
- Treatment of exhaust air: outlet air was purified via a cotton wool filter
- Temperature, humidity, pressure in air chamber: temperature approx. 22 °C; relative air humidity approx. 30%
TEST ATMOSPHERE
- Brief description of analytical method used: Concentration in the test atmosphere was determined by gas chromatography (WL detector).
- Samples taken from breathing zone: yes
VEHICLE
- Composition of vehicle (if applicable):polyethylene glycol 400 (= PE) - ethanol mixture (mixing ration 1:1) for low concentrations
- Concentration of test material in vehicle (if applicable): approx. 10000 µL PE/m3 as an aerosol, approx. 10000 µL ethanol/m3 as a vapor)
TEST ATMOSPHERE (if not tabulated)
- Particle size distribution/MMAD (Mass median aerodynamic diameter) / GSD (Geometric st. dev.): see any other information - Analytical verification of test atmosphere concentrations:
- yes
- Remarks:
- Concentration in the test atmosphere was determined by gas chromatography (WL detector)
- Duration of exposure:
- >= 4 h
- Concentrations:
- nominal: 1000; 5000; 20000; 50000 mg/m3
analytical: 118.5; 586.4; 2007.6; 3550.7 mg/m3 - No. of animals per sex per dose:
- 5
- Control animals:
- yes
- Details on study design:
- - Duration of observation period following administration: 2 weeks post-treatment observation period
- Frequency of observations and weighing: Clinical signs - several times on day of exposure
- twice daily (mornig evening)
Rectal temperature - directly after exposure was completed
Body weights - before exposure; day 3 and 7
- Necropsy of survivors performed: yes
- Other examinations performed: clinical signs, body weight,organ weights, rectal temperature, necropsy - Statistics:
- yes, different methods (Fisher's Pairwise Test, Box Test, ANOVA method etc)
- Key result
- Sex:
- male/female
- Dose descriptor:
- LC50
- Effect level:
- > 3 550.7 mg/m³ air (analytical)
- Exp. duration:
- 4 h
- Mortality:
- No animals died up to and including a concentration of 20000 mg/m3 (nominal)
One male animal died on day 0 at a concentration of 50000 mg/m3 (nominal) all other animals survived the postobservation period - Clinical signs:
- other: - 0mg/m3 and 1000mg/m3: All rats tolerated the treatment without clinical signs. - 5000mg/m3 Nose reddened, reduced motility, piloerection. All animals without signs from day 1 of the post-treatment observationperiod - 20000mg/m3 Rhinarium swollen, nose r
- Body weight:
- A toxicologically significant influence on body weights occurred during the post-treatment observation period from 20000 mg/m3 onwards.
- Gross pathology:
- Rats which died intercurrently; Lung distended, liver-like and edematous; hydrothorax; nose and rhinarium reddened and swollen; spleen pale; kidneys marbled; contents of duodenum slimy-yellow.
Rats sacrificed at the end of the post-treatment observation period; Gross pathological examination revealed no evidence of specific organ changes. In 50000µL/m3 "distended lung" tended to be more prevalent amongst the animals. - Other findings:
- A toxicologically significant hypothermia was determined at the end of exposure from group 3 (5000 mg/m3 air)
- Interpretation of results:
- not classified
- Remarks:
- Migrated information Acute inhaltion toxicity tested up to max attainable conc. Criteria used for interpretation of results: other: EU GHS EC 1272/2008
- Conclusions:
- LC50 inhalation (aerosol) Rat (exposure: 4 h) > 3551 mg/m3 air
- Executive summary:
A study for acute inhalation toxicity was conducted with "confidential substance name" in accordance with OECD Guideline No. 403.
Therefore 5 SPF-bred Wistar rats were exposed (head/nose only) to 118.5; 586.4; 2007.6 and 3550.7 mg/m3 (analytical determined).
Rats subjected to a concentration of 119 mg/m3 air tolerated the exposure without signs occurring. Rats exposed to 586 mg/m3 air exhibited a transient reddening of the nose on the day of exposure and reduced motility. Rats subjected to the max. tested concentration (3551 mg/m3 air; nebulization of the undiluted test article) exhibited persistent signs causally linked to an irritation of the respiratory tract (slower breathing, serous nasal discharge, dyspnea, stridor, hypothermia). 3551 mg/m3 air was the range at which mortality started for male rats (1 of 5 died). The results of this study show that the respirable test article aerosol had a relatively low acute inhalative toxic effect on the rat. The acute potential hazard of the respiratory tract is attributed to the potency of the test substance aerosol to act as a mucosa irritant. LC50 inhalation (aerosol) Rat (exposure: 4 h) > 3551 mg/m3 air
- Endpoint:
- acute toxicity: inhalation
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Justification for type of information:
- 1. HYPOTHESIS FOR THE ANALOGUE APPROACH
The read-across hypothesis proposed is that the organism is not exposed to common compounds but rather, as a result of structural similarity, that different compounds have similar toxicological and fate properties. In this case the ECHA Read-Across Assessment Framework (RAAF) Scenario 2 is used.
2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
Source: N,N-Dimethyldecan-1-amide, mixture with N,N-Dimethyloctan-1-amide [CAS 67359-57-3]
Target: Reaction Mass of N,N-Dimethyldodecanamide and N,N-Dimethyltetradecanamide [EC not assigned; CAS not assigned]
3. ANALOGUE APPROACH JUSTIFICATION
It may be concluded that both the registered substance (target) and the source molecules can be regarded as close structural analogues having both similar physical chemical and toxicological properties. It follows that where endpoints for the registered substance may not have experimental evidence, particularly those involving animal studies, that these can be addressed by read across grouping using an analogue approach. It is therefore proposed that, after careful assessment, experimental data from the source molecules may be used as surrogate evidence for read across to the registered substance. Please refer to attached document for information on the data available to support the read-across.
4. DATA MATRIX
Please refer to attached document - Reason / purpose for cross-reference:
- read-across source
- Key result
- Sex:
- male/female
- Dose descriptor:
- LC50
- Effect level:
- 3 550.7 mg/m³ air (analytical)
- Exp. duration:
- 4 h
Referenceopen allclose all
ASSESSMENT AND DISCUSSION:
The test substance as an aerosol proved to have a relatively low acute inhalative toxicity in the rat up to the maximum tested concentration of 3551 mg/m3 air.
A single 4-hour exposure to 3551 mg/m3 air resulted in relatively persistent respiratory disorders considered to be causally related to a primary irritant effect on the respiratory tract. The hypothermia determined from 586.4 mg/m3 air is considered to be causally related to the aerosol's local irritant potential.
Endpoint conclusion
- Endpoint conclusion:
- no adverse effect observed
- Dose descriptor:
- LC50
- Value:
- 3 551 mg/m³ air
- Quality of whole database:
- Reliability 1
Acute toxicity: via dermal route
Link to relevant study records
- Endpoint:
- acute toxicity: dermal
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 1997
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Study according OECD guideline, GLP, well documented
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 402 (Acute Dermal Toxicity)
- Qualifier:
- according to guideline
- Guideline:
- EU Method B.3 (Acute Toxicity (Dermal))
- GLP compliance:
- yes
- Test type:
- standard acute method
- Limit test:
- yes
- Species:
- rat
- Strain:
- Wistar
- Sex:
- male/female
- Details on test animals or test system and environmental conditions:
- TEST ANIMALS
- Source: Tierzucht Schönwalde GmbH, Schönwalde, Germany
- Weight at study initiation: weight on dosing day 192-252g
- Fasting period before study: not fasted prior dosing
- Housing: animal room 4, filtered air, transparent polycarbonate cages (macrolonge type III), two or three rats per cage
- Diet (e.g. ad libitum): Altromin 1314 (Altromin, Lage, Germany) ad libitum
- Water (e.g. ad libitum): ad libitum (acified pH=2.5 with HCl)
- Acclimation period: 36 days (female), 8 days (male)
ENVIRONMENTAL CONDITIONS
- Temperature (°C): 21±3°C
- Humidity (%): 55±15%
- Air changes (per hr): 10 times/h
- Photoperiod (hrs dark / hrs light): 12h each - Type of coverage:
- semiocclusive
- Vehicle:
- water
- Details on dermal exposure:
- TEST SITE
- Area of exposure: 5*6cm
- coverage: 4-layer gauze
- Type of wrap if used: Micropore tape wounded around the trunk
REMOVAL OF TEST SUBSTANCE
- Washing (if done): sponged with lukewarm water
- Time after start of exposure: 24h
TEST MATERIAL
- Constant volume or concentration used: constant dose of 5000mg/kg b.wt.
- Duration of exposure:
- 24h
- Doses:
- Pilot study: 2000 and 5000 mg/kg b.wt.
Main study: 5000 mg/kg b.wt. - No. of animals per sex per dose:
- 5
- Control animals:
- not specified
- Details on study design:
- according to guideline
- Statistics:
- no
- Preliminary study:
- Pilot study: no abnormalities observed at the animal dosed with 2000 mg/kg b.wt.
piloerection were observed at the animal dosed with 5000 mg/kg b.wt.
Therefore main study was accomplished with 5000 mg/kg b.wt. - Key result
- Sex:
- male/female
- Dose descriptor:
- LD50
- Effect level:
- > 5 000 mg/kg bw
- Mortality:
- Pilot study: no deaths observed
Main study: no deaths observed - Clinical signs:
- other: Pilot study: only piloerections (one male) Main study: piloerection 1 and 3 hours after application (all animals)
- Gross pathology:
- Pilot study: post mortem inspection revealed no abnormalities
Main study: post mortem inspection revealed no abnormalities - Other findings:
- not stated
- Interpretation of results:
- not classified
- Remarks:
- Migrated information Criteria used for interpretation of results: other: EU GHS EC 1272/2008
- Conclusions:
- Under the experimental conditions the dermal LD50 of N,N-Dimethyldecan-1-amide in rats was found to be above 5000mg/kg b.wt.
- Executive summary:
The acute dermal toxicity of N,N-Dimethyldecan-1-amide in rats was determined according to the method recommended in the OECD Guideline No. 402 "Acute Dermal Toxicity", Feb. 1987, and the corresponding EEC GuidelineB.3 "Acute Toxicity (Dermal)", 29.12.92.
The study was performed as a limit test with 10 Wistar rats (five males and five females). The rats were exposed to a single dermal dose of 5000 mg/kg b.wt. for 24 hours followed by an observation period of 14 days. During the study clinical signs of reaction to the treatment were recorded daily. Body weight was recorded once a week. After the two week observation period the animals were killed and subjected to a gross necropsy examination.
All animals in the main study survived the treatment and showed very slight signs of toxicity.
Under the experimental conditions described in this report, the dermal LD50 of SAT 970 419 in rats was found to be above 5000 mg/kg b.wt.
- Endpoint:
- acute toxicity: dermal
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Justification for type of information:
- 1. HYPOTHESIS FOR THE ANALOGUE APPROACH
The read-across hypothesis proposed is that the organism is not exposed to common compounds but rather, as a result of structural similarity, that different compounds have similar toxicological and fate properties. In this case the ECHA Read-Across Assessment Framework (RAAF) Scenario 2 is used.
2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
Source: N,N-Dimethyldecanamide [ EC 238-405-1; CAS 14433-76-2]
Target: Reaction Mass of N,N-Dimethyldodecanamide and N,N-Dimethyltetradecanamide [EC not assigned; CAS not assigned]
3. ANALOGUE APPROACH JUSTIFICATION
It may be concluded that both the registered substance (target) and the source molecules can be regarded as close structural analogues having both similar physical chemical and toxicological properties. It follows that where endpoints for the registered substance may not have experimental evidence, particularly those involving animal studies, that these can be addressed by read across grouping using an analogue approach. It is therefore proposed that, after careful assessment, experimental data from the source molecules may be used as surrogate evidence for read across to the registered substance. Please refer to attached document for information on the data available to support the read-across.
4. DATA MATRIX
Please refer to attached document - Reason / purpose for cross-reference:
- read-across source
- Key result
- Sex:
- male/female
- Dose descriptor:
- LD50
- Effect level:
- > 5 000 mg/kg bw
Referenceopen allclose all
Endpoint conclusion
- Endpoint conclusion:
- no adverse effect observed
- Dose descriptor:
- LD50
- Value:
- 5 000 mg/kg bw
- Quality of whole database:
- Reliability 1
Additional information
No acute toxicity data are available for the registered substance, Reaction mass of N,N-dimethyldodecanamide and N,N-dimethyltetradecanamide.
Valid data are available for the assessment of acute oral and acute dermal toxicity of N,N-Dimethyldecanamide. Acute inhalation toxicity was tested with a mixture of N,N-dimethyldecanamide and N,N-dimethyloctanamide (with traces of N,N-dimethyldodecanamide and N,N-dimethylhexanamide). These data are read across to the registered substance as its toxicological behaviour is assumed to be similar to these analogues.
Acute oral toxicity (N,N-dimethyldecanamide):
The acute oral toxicity in rats was determined according to OECD TG 420 (Cognis 1997; M. Hoyer).The study was initiated with a sighting study, in which one female rat was given N,N-Dimethyldecan-1 -amide in a 2000 mg/kg bw dose. Slight signs of toxicity were observed in this rat, therefore another female rat was given N,N-Dimethyldecan-1-amide in a 5000 mg/kg bw dose. This animal died under severe signs of toxicity on day 2.On the basis of the results from the sighting study it was decided to carry out the main study with one group consisting of five male and five female rats given a dose of 2000 mg/kg bw.All animals in the main study survived the treatment and showed slight signs of toxicity (clinical signs: pinched abdomen, piloerection). Gross necropsy revealed a gas filled intestine for three animals, distended vessel of testes in one animal, light margin of liver in two animals.
The oral LD50 of N,N-Dimethyldecan-1-amide in rats was found to be above 2000 mg/kg bw.
Acute dermal toxicity (N,N-dimethyldecanamide):
The acute dermal toxicity of N,N-dimethyldecanamid in rats was determined according OECD TG 402.The study was performed as a limit test with 10 Wistar rats (five males and five females). The rats were exposed to a single dermal dose of 5000 mg/kg bw for 24 hours followed by an observation period of 14 days. During the study clinical signs of reaction to the treatment were recorded daily. Body weight was recorded once a week. After the two week observation period the animals were killed and subjected to a gross necropsy examination. All animals in the main study survived the treatment and showed very slight signs of toxicity. Some females show stagnation in body weight increase all other rats had normal body weight gain. Clinical signs were only piloerections and post mortem inspection revealed no abnormalities. The dermal LD50 of N,N-dimethyldecanamide in rats was found to be above 5000 mg/kg bw.
Acute inhalation toxicity (mixture of dimethylamides):
A study for acute inhalation toxicity was conducted with the test substance in accordance with OECD TG 403 (Bayer 1991; J. Pauluhn). Therefore 5 SPF-bred Wistar rats were exposed (head/nose only) to 118.5; 586.4; 2007.6 and 3550.7 mg/m3 (analytical determined).Rats subjected to a concentration of 119 mg/m3 air tolerated the exposure without signs occurring. Rats exposed to 586 mg/m3 air exhibited a transient reddening of the nose on the day of exposure and reduced motility. Rats subjected to the max. tested concentration (3551 mg/m3 air; nebulisation of the undiluted test article) exhibited persistent signs causally linked to an irritation of the respiratory tract (slower breathing, serous nasal discharge, dyspnea, stridor, hypothermia). 3551 mg/m3 air was the range at which mortality started for male rats (1 of 5 died). The results of this study show that the respirable test article aerosol had a relatively low acute inhalation toxicity in the rat. The acute potential hazard of the respiratory tract is attributed to the potency of the test substance aerosol to act as a mucosa irritant. LC50 inhalation (aerosol) Rat (exposure: 4 h) > 3551 mg/m3 air.
It must also be noted that such a high concentration of 3551 mg/m3 (analytically determined) is created by a nominal concentration of 50000 mg/m3
Justification for classification or non-classification
The available study indicate an oral LD50 (rat) > 2000 mg/kg bw (Cognis 1997; M. Hoyer) for male and female rats. Therefore classification for acute oral toxicity according to CLP is not required.
As the LD50 (rat) for acute dermal toxicity was >5000 mg/kg bw (Cognis 1997; M. Hoyer) and no death occurred, classification for acute dermal toxicity according to CLP is not required.
As an acute inhalation toxicity test with a mixture of dimethylamides (main components N,N-dimethyloctanamide, N,N-dimethyldecanamide) reveals only one death in the highest administered concentration of 3551 mg/m3 air, which reflexes the maximum attainable concentration (due to physical properties; nominal concentration 50000 mg/m3), classification for acute inhalation toxicity is not required according to CLP.
Based on read-across to the available data on its analogues, it is concluded that the registered substance, Reaction mass of N,N-dimethyldodecanamide and N,N-dimethyltetradecanamide is not classified for acute toxicity via the oral, dermal or inhalation routes.
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