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EC number: 241-168-7 | CAS number: 17096-47-8
- 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
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- Nanomaterial crystalline phase
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- Nanomaterial aspect ratio / shape
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- 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
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- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
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- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
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- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
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Eye irritation
Administrative data
- Endpoint:
- eye irritation: in vitro / ex vivo
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 18 February 2020
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 020
- Report date:
- 2020
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 437 (Bovine Corneal Opacity and Permeability Test Method for Identifying i) Chemicals Inducing Serious Eye Damage and ii) Chemicals Not Requiring Classification for Eye Irritation or Serious Eye Damage)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
Test material
- Reference substance name:
- 2-(methylnitroamino)ethyl nitrate
- EC Number:
- 241-168-7
- EC Name:
- 2-(methylnitroamino)ethyl nitrate
- Cas Number:
- 17096-47-8
- Molecular formula:
- C3H7N3O5
- IUPAC Name:
- methyl(nitro)[2-(nitrooxy)ethyl]amine
- Test material form:
- solid
Constituent 1
- Specific details on test material used for the study:
- TREATMENT OF TEST MATERIAL PRIOR TO TESTING
- Treatment of test material prior to testing: The test item was phlegmatized in 15% water for safety reasons during transportation. Thus, the test item was dried under vacuum in the desiccator and weighed. This procedure was repeated until a constant weight was obtained for every replicate used in the test. Content of water obtained:
Replicate 1: 13.5%
Replicate 2: 15.1%
Replicate 3: 14.0%
Test animals / tissue source
- Species:
- cattle
- Strain:
- other: Bos primigenius Taurus
- Details on test animals or tissues and environmental conditions:
- SOURCE OF COLLECTED EYES
- Source: Müller Fleisch GmbH, Industriestraße 42, 75217 Birkenfeld, Germany.
- Number of animals: Not specified. 9 corneas received for the test.
- Characteristics of donor animals (e.g. age, sex, weight): Between 12 and 60 months old.
- Storage, temperature and transport conditions of ocular tissue (e.g. transport time, transport media and temperature, and other conditions): The eyes were transported to the test facility in Hanks’ Balanced Salt Solution with 1% Penicillin-Streptomycin solution (Penicillin 100 U/mL, Streptomycin 100 µg/mL) in a suitable cooled container within 1 hour and 5 minutes.
- Time interval prior to initiating testing: the test was performed on the day of the transport.
- indication of any existing defects or lesions in ocular tissue samples: None of the corneas received showed tissue damage; therefore, all corneas were used.
- Indication of any antibiotics used: Penicillin 100 U/mL, Streptomycin 100 µg/mL.
Test system
- Vehicle:
- unchanged (no vehicle)
- Controls:
- yes, concurrent positive control
- yes, concurrent negative control
- Amount / concentration applied:
- TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 749.2 mg (replicate1), 614.9 mg (replicate2) and 668.1 mg (replicate3).
- Concentration (if solution): undiluted - Duration of treatment / exposure:
- 4 hr
- Duration of post- treatment incubation (in vitro):
- Not performed.
- Number of animals or in vitro replicates:
- 3 replicates.
- Details on study design:
- SELECTION AND PREPARATION OF CORNEAS
After the arrival of the corneas, they were examined and only corneas which were free from damages were used. The corneas were excised with a scalpel and cut from the globe with a 2-3 mm ring of sclera around the outside. Each cornea was transferred to a cornea holder in which pre-warmed cMEM (32 ± 1ºC) without phenol red was filled. The holders were then incubated for 1 hour in the incubation chamber at 32 ± 1ºC.
MEM: Minimum Essential Medium
cMEM (complete MEM): MEM supplemented with sodium bicarbonate, L-glutamine and 1% fetal calf serum
QUALITY CHECK OF THE ISOLATED CORNEAS
Corneas which show any tissue damages or an opacity greater than seven opacity units should be discarded.
NUMBER OF REPLICATES: 3
NEGATIVE CONTROL USED: yes, Hank’s Balanced Salt Solution (HBSS).
POSITIVE CONTROL USED: yes, 20% imidazole solution in HBSS.
APPLICATION DOSE AND EXPOSURE TIME: 615 to 750 mg (test item tested neat) and 750 μL (negative and positive controls) , 4 h exposure.
TREATMENT METHOD:
The open chamber method was used for the test item.
The closed chamber method was used for the controls.
POST-INCUBATION PERIOD: no
REMOVAL OF TEST SUBSTANCE
- Number of washing steps after exposure period: at least three times or until no visual evidence of test chemical was observed.
METHODS FOR MEASURED ENDPOINTS:
- Corneal opacity: Opacitometer BASF OP 3.0.
- Corneal permeability: passage of sodium fluorescein dye (optical density at 492 nm) measured with microtiter plate photometer (Anthos Reader 2010 Flexi).
SCORING SYSTEM: In Vitro Irritancy Score (IVIS)
DECISION CRITERIA: as indicated in the TG (see table below).
Results and discussion
In vitro
Resultsopen allclose all
- Irritation parameter:
- in vitro irritation score
- Run / experiment:
- mean
- Value:
- 3.52
- Vehicle controls validity:
- not applicable
- Negative controls validity:
- valid
- Remarks:
- (0.99)
- Positive controls validity:
- valid
- Remarks:
- (111.39)
- Irritation parameter:
- cornea opacity score
- Run / experiment:
- mean
- Value:
- 3.53
- Vehicle controls validity:
- not applicable
- Negative controls validity:
- valid
- Remarks:
- (0.89)
- Positive controls validity:
- valid
- Remarks:
- (87.20)
- Irritation parameter:
- other: permeability
- Run / experiment:
- mean
- Value:
- -0.001
- Vehicle controls validity:
- not applicable
- Negative controls validity:
- valid
- Remarks:
- (0.0071)
- Positive controls validity:
- valid
- Remarks:
- (1.6128)
- Other effects / acceptance of results:
- OTHER EFFECTS:
- Visible damage on test system: no.
DEMONSTRATION OF TECHNICAL PROFICIENCY: yes
ACCEPTANCE OF RESULTS:
- A test is considered acceptable if: the positive control gives an IVIS that falls within two standard deviations of the current historical mean and negative/solvent controls gives values of opacity and permeability lower than upper limits for background values.
- Acceptance criteria met for negative control: yes, HBSS response resulted in opacity and permeability values that are less than established upper limits for negative control opacity (2.81) and permeability values (0.07)
- Acceptance criteria met for positive control: yes, IVIS score of imidazole 20% was 111.39 which falls between two standard deviations of the historical mean i.e. 75.56 – 145.51.
Any other information on results incl. tables
Table1.1. Illuminance Values (Unit: LUX)
Parameter |
Negative Control |
Test Item |
Positive Control |
||||||
1. Rep. |
2. Rep. |
3. Rep. |
1. Rep. |
2. Rep. |
3. Rep. |
1. Rep. |
2. Rep. |
3. Rep. |
|
(I) Measured values before exposure |
1042 |
1050 |
1053 |
1016 |
1023 |
1027 |
1004 |
1004 |
1016 |
(I) Measured values after exposure |
1020 |
1027 |
1033 |
914 |
932 |
935 |
342 |
324 |
337 |
Table 1.2. Opacity Values Negative Control
Parameter |
Negative Control |
||
1. Rep. |
2. Rep. |
3. Rep. |
|
Opacity before exposure |
2.84 |
2.52 |
2.40 |
Opacity after exposure |
3.75 |
3.46 |
3.21 |
Opacity Difference |
0.91 |
0.94 |
0.81 |
Mean Opacity Difference |
0.89 |
Table 1.3. Opacity Values Test Item and Positive Control
Parameter |
Test Item |
Positive Control |
||||
1. Rep. |
2. Rep. |
3. Rep. |
1. Rep. |
2. Rep. |
3. Rep. |
|
Opacity before exposure |
3.92 |
3.62 |
3.46 |
4.44 |
4.44 |
3.92 |
Opacity |
8.76 |
7.83 |
7.68 |
89.33 |
96.48 |
91.24 |
Opacity |
4.84 |
4.20 |
4.22 |
84.89 |
92.05 |
87.32 |
Opacity |
3.95 |
3.32 |
3.33 |
84.01 |
91.16 |
86.43 |
Mean Opacity |
3.53 |
87.20 |
Table 2.1. Optical density at 492 nm of Blank
Parameter |
cMEM without phenol red |
1. Measurement |
0.038 |
2. Measurement |
0.039 |
3. Measurement |
0.037 |
Mean |
0.038 |
Table 2.2. Optical density at 492 nm of Negative Control, Test Item and Positive Control
Parameter |
Negative Control |
Test Item |
Positive Control |
||||||
1. Rep. |
2. Rep. |
3. Rep. |
1. Rep. |
2. Rep. |
3. Rep. |
1.Rep. |
2.Rep. |
3.Rep. |
|
1. Measurement |
0.050 |
0.045 |
0.041 |
0.047 |
0.045 |
0.039 |
1.705 |
1.787 |
1.469 |
2. Measurement |
0.050 |
0.044 |
0.039 |
0.047 |
0.047 |
0.040 |
1.710 |
1.813 |
1.456 |
3. Measurement |
0.050 |
0.045 |
0.042 |
0.044 |
0.051 |
0.040 |
1.705 |
1.814 |
1.462 |
|
|||||||||
1. Measurement – blank |
0.0120 |
0.0070 |
0.0030 |
0.0090 |
0.0070 |
0.0010 |
1.6670 |
1.7490 |
1.4310 |
2. Measurement – blank |
0.0120 |
0.0060 |
0.0010 |
0.0090 |
0.0090 |
0.0020 |
1.6720 |
1.7750 |
1.4180 |
3. Measurement – blank |
0.0120 |
0.0070 |
0.0040 |
0.0060 |
0.0130 |
0.0020 |
1.6670 |
1.7760 |
1.4240 |
Mean of each replicate |
0.0120 |
0.0067 |
0.0027 |
0.0080 |
0.0097 |
0.0017 |
1.6687 |
1.7667 |
1.4243 |
Mean of the 3 replicates |
0.0071 |
-- |
-- |
||||||
Corrected |
-- |
-- |
-- |
0.0009 |
0.0026 |
-0.0054 |
1.6616 |
1.7596 |
1.4172 |
Corrected mean of the 3 replicates |
-- |
-0.0007 |
1.6128 |
Table 3. IVIS
Test Group |
IVIS |
Mean IVIS |
Relative Standard Deviation IVIS |
Negative Control |
1.09 |
0.99 |
12.81% |
1.04 |
|||
0.85 |
|||
Test Item |
3.96 |
3.52 |
10.93% |
3.35 |
|||
3.25 |
|||
Positive Control |
108.93 |
111.39 |
4.82% |
117.55 |
|||
107.69 |
*IVIS = Mean Opacity value + (15 × Mean Permeability value)
Applicant's summary and conclusion
- Interpretation of results:
- other: No prediction can be made (CLP Regulation EC no. 1272/2008)
- Conclusions:
- The test item cannot be predicted as not classified for eye irritation/serious eye damage or as causing serious eye damage with the BCOP test method.
- Executive summary:
An in vitro Bovine Corneal Opacity and Permeability (BCOP) study was conducted in order to determine the potential severe eye damaging effects of the test item according to the OECD guideline 437 under GLP conditions. Three sets consisting of three corneas each were tested: the first set was the negative control and was treated using the closed chamber method with 750 μL Hank’s Balanced Salt Solution (HBSS); the second set was the positive control and was treated using the closed chamber method with 750 μL of 20% imidazole solution and the third set was treated using the open chamber method with 615 to 750 mg of test item without dilution. The corneas were exposed for 4 hours at 32ºC. After exposure, opacity of the corneas and fluorescein permeability were measured. Negative control showed No category (IVIS score 0.99) and resulted in opacity and permeability values that are less than the established upper limits for the background values. The positive control induced serious eye damage on the cornea (IVIS score 111.39) and was within two standard deviations of the current historical mean. The test item exhibited an IVIS score of 3.52, thus cannot be predicted as not classified for eye irritation/serious eye damage or as causing serious eye damage with the BCOP test method.
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