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EC number: 203-838-7 | CAS number: 111-14-8
- 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
- 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
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: 1a. OECD guideline 406 followed under GLP procedures
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 1 997
- Report date:
- 1997
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 406 (Skin Sensitisation)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method B.6 (Skin Sensitisation)
- Deviations:
- no
- GLP compliance:
- yes
- Type of study:
- guinea pig maximisation test
- Justification for non-LLNA method:
- study performed before the implementation of reach regulation.
Test material
- Reference substance name:
- Heptanoic acid
- EC Number:
- 203-838-7
- EC Name:
- Heptanoic acid
- Cas Number:
- 111-14-8
- Molecular formula:
- C7H14O2
- IUPAC Name:
- heptanoic acid
- Details on test material:
- - Name of test material (as cited in study report): n-heptanoic acid
- Substance type: carboxylic acid
- Physical state: liquid
- Analytical purity: 99.51 %
- Purity test date: 10 september 1996
- Lot/batch No.: 9604035
- Expiration date of the lot/batch: september 1997
- Storage condition of test material: in dark at room temperature
Constituent 1
In vivo test system
Test animals
- Species:
- guinea pig
- Strain:
- Dunkin-Hartley
- Sex:
- male/female
- Details on test animals and environmental conditions:
- TEST ANIMALS
- Source: Centre d'Elevage Lebeau, 78950 Gambais, France.
- Age at study initiation: approximately three months old
- Weight at study initiation: 323 +/- 13 g for the males and 346 +/- 16 g for the females
- Housing: individually in polycarbonate cages
- Diet : free access to "106 pelleted diet"
- Water : ad libitum
- Acclimation period: at least five days before the beginning of the study
ENVIRONMENTAL CONDITIONS
- Temperature (°C): 21 +/- 2
- Humidity (%): 30 to 70
- Air changes : about 12 cycles/hour of filtered, non-recycled air
- Photoperiod : 12 hrs dark / 12 hrs light
IN-LIFE DATES: From: 21 november 1996 To: 20 december 1996
Study design: in vivo (non-LLNA)
Induction
- Route:
- intradermal and epicutaneous
- Vehicle:
- paraffin oil
- Concentration / amount:
- concentration for induction exposure :
- intradermal injection: n-Heptanoic acid at 1% (w/w) in paraffin oil
- topical application: n-Heptanoic acid undiluted
concentration for challenge exposure:
- topical application: n-Heptanoic acid undiluted
Challenge
- Route:
- epicutaneous, occlusive
- Vehicle:
- paraffin oil
- Concentration / amount:
- concentration for induction exposure :
- intradermal injection: n-Heptanoic acid at 1% (w/w) in paraffin oil
- topical application: n-Heptanoic acid undiluted
concentration for challenge exposure:
- topical application: n-Heptanoic acid undiluted
- No. of animals per dose:
- - Control group (five males and five females)
- Treated group (ten males and ten females) - Details on study design:
- RANGE FINDING TESTS: preliminary tests were conducted on male and female animals in order to determine the concentration to be used in the main study
Preliminary study:
- Administration by intradermal route: Concentrations of 0.1, 1, 5, 10 and 25 % (w/w) were tested. At 5, 10 and 25 % (w/w) necrosis was induced and a slight irritation was induced at 0.1, 1 % (w/w). Concentration chosen for the main study was 1 % (w/w).
-cutaneous route: several concentrations were tested (25 to 100 %) and scoring after 24h and 48h after removal of the dressing. All concentrations were well tolerated systematically and locally by male and female animals. The highest concentration was retained for the two topical application on day 8 and 22 of the definitive test.
MAIN STUDY
A. INDUCTION EXPOSURE
- No. of exposures: 2 (intradermal route on day 1 (3 injections of 0.1ml ) and cutanaous route on day 8)
- Test groups: n-Heptanoic acid in FCA
- Control group: FCA only
- Site: dorsal region between the shoulders
- Duration: day 0 to 8 then day 8 to 22
- Concentrations: intradermal injection 1 % (w/w) and cutaneous application undiluted
B. CHALLENGE EXPOSURE
- No. of exposures: 1
- Day(s) of challenge: day 22
- Exposure period: 24h
- Test groups: n-Heptanoic acid
- Control group: n-Heptanoic acid
- Site: posterior right flank (left flank -vehicule control-)
- Concentrations: undiluted (0.5 ml of the test substance was applied on skin)
- Evaluation: 24 and 48h after challenge
- Challenge controls:
- no challenge control
- Positive control substance(s):
- yes
- Remarks:
- 2,4-dinitro Chlorobenzene (DNCB)
Results and discussion
- Positive control results:
- The sensitivity of the guinea-pigs was checked with a sensitizer: 2,4-Dinitrochlorobenzene (DNCB). During the induction period the reference substance DNCB was applied at the concentration of 0.1% (w/w) (day 1) and 1% (w/w) (day 8). For the challenge application, the DNCB was applied to the right flank at a concentration of 0.5 % (w/w). Under the conditions of this test, DNCB at a concentration of 0.5 % (w/w) induced positive skin sensitization reactions in 50 % of the guinea-pigs.
In vivo (non-LLNA)
Resultsopen allclose all
- Reading:
- 1st reading
- Hours after challenge:
- 24
- Group:
- negative control
- Dose level:
- undiluted
- No. with + reactions:
- 0
- Total no. in group:
- 10
- Clinical observations:
- very slight erythema (grade 1) in 6/10 animals, dryness of the skin in 2/10 animals
- Reading:
- 2nd reading
- Hours after challenge:
- 48
- Group:
- negative control
- Dose level:
- undiluted
- No. with + reactions:
- 0
- Total no. in group:
- 10
- Clinical observations:
- very slight erythema (grade 1) persisted in 5/10 animals and dryness of the skin in all animals
- Reading:
- 1st reading
- Hours after challenge:
- 24
- Group:
- test chemical
- Dose level:
- undiluted
- No. with + reactions:
- 0
- Total no. in group:
- 20
- Clinical observations:
- very slight erythema (grade 1) in 6/10 animals and dryness of the skin in 8/20 animals.A well-defined erythema (grade 2) was also noted in 1/20 animals.
- Reading:
- 2nd reading
- Hours after challenge:
- 48
- Group:
- test chemical
- Dose level:
- undiluted
- No. with + reactions:
- 0
- Total no. in group:
- 20
- Clinical observations:
- very slight erythema (grade 1) in 5/5 animals and dryness of the skin in all animals. Crusts were observed in 1/20 animals.
- Reading:
- other:
- Group:
- positive control
- Remarks on result:
- other: DNB induced positive reactions in 50% of animals.
Applicant's summary and conclusion
- Interpretation of results:
- not sensitising
- Remarks:
- Migrated information
- Conclusions:
- According to the maximization method of Magnusson and Kligman, no cutaneous reactions attributable to the sensitization potential of the test substance n-Heptanoic acid (batch No. 9604035) were observed . Classification: not sensitizing according to EU and GHS classification.
- Executive summary:
In a skin sensitization test (CIT, 1997), the potential of n-Heptanoic acid (batch No. 9604035) to induce delayed contact hypersensitivity was evaluated in guinea pigs according to the maximization method of Magnusson and Kligman OECD 406. Thirty animals were allocated to 2 groups: a control group 1 (5 males/ 5 females) and a treated group 2 (10 males/ 10 females). Skin reactions were evaluated approximatively 24 and 48h after removal of the dressing. At the end of the study animals were killed without examination of internal organs (no necropsy). Skin samples were taken from the posterior left and right flanks of all animals and were preserved in 10 % buffered formalin.
No clinical signs and no deaths were observedduring the study. The body weight gain of the treated animals was normal when compared to that of the control animals.
On day 10, after the cutaneous application of the induction period, signs of irritation were observed at the test site (dorsal region between shoulders) in the control and treated groups. After the cutaneous challenge application, at the 24-hour reading, slight cutaneous reactions (very slight erythema in 6/10 animals, dryness of the skin in 2/10 animals) were noted in the control group. These reactions persisted at the 48-hour reading (very slight erythema in 5/10 animals and dryness of the skin in all animals).
In the treated group, the same cutaneous reactions were observed: very slight erythema in 6/20 animals at the 24-hour reading and in 5/20 animals at the 48-hour reading, dryness of the skin in 8/20 animals at the 24-hour reading and in all animals at the 48-hour reading. A well-defined erythema was also noted in 1/20 animals at the 24-hour reading and crusts were observed in 1/20 animals at the 48-hour reading. After the microscopic examination, the cutaneous reactions observed in both groups were attributed to slight irritant properties of the test substance. The sensitivity of the guinea-pigs was satisfactory since 50% of the animals showed a positive reaction with DNCB.
Under the tested condition and according to the maximization method of Magnusson and Kligman, the test substance n-Heptanoic acid does not induce delayed contact hypersensitivity in guinea-pigs.
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