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EC number: 230-386-8 | CAS number: 7085-19-0
- 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 (non-LLNA)
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 17 August 1983 to 15 September 1983
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study with acceptable restrictions
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 984
- Report date:
- 1984
Materials and methods
Test guideline
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 406 (Skin Sensitisation)
- GLP compliance:
- yes (incl. QA statement)
- Type of study:
- guinea pig maximisation test
- Justification for non-LLNA method:
- The study pre-dates the introduction of the LLNA method.
Test material
- Reference substance name:
- Mecoprop
- EC Number:
- 230-386-8
- EC Name:
- Mecoprop
- Cas Number:
- 7085-19-0
- Molecular formula:
- C10H11ClO3
- IUPAC Name:
- 2-(4-chloro-2-methylphenoxy)propanoic acid
- Test material form:
- solid
- Details on test material:
- - Physical appearance: Yellowish-brown
Constituent 1
- Specific details on test material used for the study:
- TREATMENT OF TEST MATERIAL PRIOR TO TESTING
- Preparation of the test material formulations: Immediately before test material application with Ultraturrax or with a magnetic stirrer. Formulations of the test material were prepared gravimetrically. The test material was prepared in at appropriate concentrations in distilled water (aqua dest.), distilled water and paraffin oil or distilled water and Freund's adjuvant (FCA).
In vivo test system
Test animals
- Species:
- guinea pig
- Strain:
- Dunkin-Hartley
- Sex:
- female
- Details on test animals and environmental conditions:
- TEST ANIMALS
- Females nulliparous and non-pregnant: Not specified
- Weight at study initiation: 264 - 329 g
- Housing: Macrolon, type IV cages. 5 animals per cage.
- Diet: Ad libitum
- Water : Ad libitum, tap water; about 2 g of ascorbic acid per 10 L water was added to the drinking water twice a week.
- Acclimation period: At least 7 Days
ENVIRONMENTAL CONDITIONS
- Temperature: 20 - 24 °C
- Humidity: 30 - 70 %
- Photoperiod: 12 hours light (6.00 - 18.00 hours) / 12 hours darkness (18.00 - 6.00 hours)
Study design: in vivo (non-LLNA)
Inductionopen allclose all
- Route:
- intradermal
- Vehicle:
- water
- Concentration / amount:
- 10 % w/w in paraffin oil/aqua dest. (1:1), FCA/ aqua dest (1:1)
- Day(s)/duration:
- Treatment on Day 1
- Adequacy of induction:
- highest concentration used causing mild-to-moderate skin irritation and well-tolerated systemically
- Route:
- other: Percutaneous, occlusive
- Vehicle:
- water
- Concentration / amount:
- 50 % w/w (about 0.3 g)
- Day(s)/duration:
- Treatment 7 Days after indradermal induction for 48 hours
- Adequacy of induction:
- highest concentration used causing mild-to-moderate skin irritation and well-tolerated systemically
Challengeopen allclose all
- No.:
- #1
- Route:
- other: percutaneous, occlusive
- Vehicle:
- water
- Concentration / amount:
- 10 % w/w
- Day(s)/duration:
- Treatment 14 days after percutaneous application
- Adequacy of challenge:
- highest non-irritant concentration
- No.:
- #2
- Route:
- other: percutaneous, occlusive
- Vehicle:
- water
- Concentration / amount:
- 10 % w/w
- Day(s)/duration:
- One week after first challenge
- Adequacy of challenge:
- highest non-irritant concentration
- No. of animals per dose:
- 20 animals per test group, 10 animals per control group
- Details on study design:
- PRETESTS:
2 x 2 cm filter paper strips were applied to the skin of the flanks under an occlusive dressing. In the case of liquids the test filter paper strip is soaked in the test material formulation; in the case of solid substances the paper strip is coated with an approx. 0.5 mm thick layer of the test material formulation; thus, the animals were exposed to about 0.15 g of the test material formulation. Exposure period was 24 Hours, there were four test animals per concentration and there were readings 24, 48 and 72 hours after the beginning of application.
In the pretest, with percutaneous occlusive application, a 25 % aqueous formulation of the test material was found to be the minimum irritant concentration and a 25 % aqueous test substance formulation the maximum non-irritant concentration. Since in an initial test with a challenge with 25 % aqueous test material concentration, unclear test results were obtained (skin reactions in control and test animals), the concentration of the challenge was reduced to 10 % in the present investigation.
MAIN STUDY
A. INDUCTION EXPOSURE
- Intradermal induction: 6 intradermal injections in groups of two per animal
- Exposure period: 48 Hours
- Test groups: (A) Front row: 2 injections each of 0.1 mL Freund's adjuvant without test material emulsified with water in a ratio of 1:1. (B) Middle row: 2 injections each of 0.1 mL of the test material formulation. (C) Back row: 2 injections each of 0.1 mL Freund's adjuvant / water (1:1) with test material
- Control group: The animals were given the same injections but without the test material, only with the formulating agent
- Site: Shoulder
- Readings: 24 hours after the beginning of application
- Percutaneous induction: 0.3 g of test material formulation was applied by means of 2 x 4 cm filter strip to the skin of the shoulder under an occlusive dressing.
- Exposure period: 48 hours
- Control groups: Control animals were not treated since the distilled water used as a formulating agent was not expected to influence the result of the study
- Site: Shoulder
- Readings: 48 hours after the beginning of application
B. CHALLENGE EXPOSURE
- Challenge 1: 0.15 g of test material formulation was applied by means of 2 x 2 cm filter strip to the skin of the flank under an occlusive dressing. Test group and control group one received treatment with test material formulation (control without test material), control group remained untreated.
- Challenge 2: Amount applied and method of application was the same as challenge one. Test group and both control groups one and two received test material formulation (controls without test material)
- Days of challenge: Challenge 1 was 19 days after intradermal induction, challenge 2 began 26 days after intradermal induction.
- Exposure period: 24 Hours
- Site: intact clipped flanks
- Concentrations: 10 % (w/w) of test material in aqua dest.
- Readings: 24, 48 and 72 hours after the beginning of application
OTHER:
- Preparation of animals: Clipping of the test animals, if required, was completed 3 to 5 hours before each reading and before each test material application at the appropriate application sites.
- Clinical examinations: No detailed examinations; a check for sick animals and for those showing deteriorated general state each workday.
- Bodyweight: Animals were weighed before each test material application and before the end of the study
- Scoring:
Erythema and eschar formation:
No erythema = 0
Very slight erythema (barely perceptible) = 1
Well-defined erythema = 2
Moderate to severe erythema = 3
Severe erythema (beet redness) to slight eschar formation (injuries in depth) = 4
Oedema formation
No oedema = 0
Very slight oedema (barely perceptible) = 1
Slight oedema (edges of area well defined by definite raising) = 2
Moderate oedema (raised approximately 1 mm) = 3
Severe oedema (raised more than 1 mm and extending beyond the area of exposure) = 4 - Challenge controls:
- A formulating agent was used that was not expected to influence the result of the test.
- Positive control substance(s):
- no
Results and discussion
In vivo (non-LLNA)
Resultsopen allclose all
- Reading:
- 1st reading
- Hours after challenge:
- 48
- Group:
- negative control
- Dose level:
- 10 % w/w in aqua dest.
- No. with + reactions:
- 0
- Total no. in group:
- 10
- Remarks on result:
- no indication of skin sensitisation
- Key result
- Reading:
- 1st reading
- Hours after challenge:
- 48
- Group:
- test chemical
- Dose level:
- 10 % w/w in aqua dest.
- No. with + reactions:
- 3
- Total no. in group:
- 19
- Clinical observations:
- Very slight erythema, and very slight edema
- Remarks on result:
- positive indication of skin sensitisation
- Reading:
- 2nd reading
- Hours after challenge:
- 72
- Group:
- negative control
- Dose level:
- 10 % in aqua dest
- No. with + reactions:
- 8
- Total no. in group:
- 10
- Clinical observations:
- Very slight erythema, thin scab-like layers
- Remarks on result:
- positive indication of skin sensitisation
- Key result
- Reading:
- 2nd reading
- Hours after challenge:
- 72
- Group:
- test chemical
- Dose level:
- 10 % w/w in aqua dest.
- No. with + reactions:
- 15
- Total no. in group:
- 19
- Clinical observations:
- Very slight erythema, thin scab-like layers
- Remarks on result:
- positive indication of skin sensitisation
- Reading:
- rechallenge
- Hours after challenge:
- 48
- Group:
- negative control
- Dose level:
- 10 % in aqua dest.
- No. with + reactions:
- 3
- Total no. in group:
- 20
- Clinical observations:
- Very slight erythema
- Remarks on result:
- positive indication of skin sensitisation
- Key result
- Reading:
- rechallenge
- Hours after challenge:
- 48
- Group:
- test chemical
- Dose level:
- 10 % w/w in aqua dest.
- No. with + reactions:
- 14
- Total no. in group:
- 19
- Clinical observations:
- Very slight erythema, and very slight edema
- Remarks on result:
- positive indication of skin sensitisation
- Reading:
- rechallenge
- Hours after challenge:
- 72
- Group:
- negative control
- Dose level:
- 10 % w/w aqua dest
- No. with + reactions:
- 13
- Total no. in group:
- 20
- Clinical observations:
- Very slight erythema, thin scab-like layers
- Remarks on result:
- positive indication of skin sensitisation
- Key result
- Reading:
- rechallenge
- Hours after challenge:
- 72
- Group:
- test chemical
- Dose level:
- 10 % w/w aqua dest
- No. with + reactions:
- 17
- Total no. in group:
- 19
- Clinical observations:
- Very slight erythema, and very slight edema, thin scab-like layers
- Remarks on result:
- positive indication of skin sensitisation
Any other information on results incl. tables
The Number of Animals with Skin Findings in Challenge Trials
1st challenge | 2nd challenge | |||
10 % in aqua dest. | ||||
48 h after application | 72 h after application | 48 h after application | 72 h after application | |
Control group 1 | 0/10 | 8/10 | 3/10 | 6/10 |
Control group 2 | untreated | 0/10 | 7/10 | |
Test group* | 3/19 | 15/19 | 14/19 | 17/19 |
x/y: Number of skin changes/number of guinea pigs tested
*1/20 animals died from pneumonia 20 days after the intradermal injection
Applicant's summary and conclusion
- Interpretation of results:
- other: Not classified according to EU criteria
- Conclusions:
- Under the conditions of this study, the skin sensitising potential of the test material is inconclusive due to the high percentage of control animals that exhibit the same reactions as the test animals.
- Executive summary:
The sensitising potential of the test material was investigated similar to OECD Test Guideline 406 and in accordance with GLP.
20 female guinea pigs were initially subjected to an intradermal induction, where they each received 6 injections in groups of two into the shoulder. Two injections contained 0.1 mL FCA without test material emulsified with water in a ratio 1:1, two injections contained 1 mL of the test material formulation (10 % (w/w) in distilled water), and finally two injections contained 0.1 mL FCA in water (1:1) with test material. After intradermal induction, distinct erythema and oedema were observed at the injection sites of the test animals and also in the case of the control animals that only received Freund's adjuvant or paraffin oil and aqua dest. (1:1) without test material; 11 test animals had necrotic skin changes. Percutaneous induction was carried out a week later, where 50 % w/w test material in distilled water was added to the same area of skin via a filter paper strip. The site was exposed for 48 hours. Percutaneous induction was only carried out in the case of the guinea pigs of the experiment group, incrustation being observed in addition to distinct erythema and oedema. No application was made to the control animals, since, with aqua dest., a vehicle was used that was not expected to influence the result of the test.
Two challenges were then undertaken, with the first beginning 19 days after the intradermal induction. The test material was applied to the clipped flank of the animals by percutaneous application (conc. 10 % w/w in aqua dest.), for 24 hours. In contrast to the percutaneous induction, the skin findings observed in the two challenges are almost without exception merely very slight, scarcely perceptible reactions: erythema and thin scab-like layers and in the 2nd challenge also isolated cases of oedema were observed.
At the readings after 48 hours the number of animals with skin findings in the test group is appreciably higher than that in control group 1. However, as a result of evidently delayed reactions, the ratio of guinea pigs with skin changes to the number of animals used is in the same range in the control groups as in the test group at the readings after 72 hours.
Under the conditions of this study, the skin sensitising potential of the test material is inconclusive due to the high percentage of control animals that exhibit the same reactions as the test animals.
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