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EC number: 800-696-3 | CAS number: 78605-96-6
- 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
Dermal absorption
Administrative data
- Endpoint:
- dermal absorption in vitro / ex vivo
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- weight of evidence
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: The study follows some principles of the OECD Guideline 428 (skin absorption : in vitro method), but the total recovery did not meet the criteria in the OECD guideline.
Data source
Reference
- Reference Type:
- publication
- Title:
- Human Skin Absorption and Metabolism of the Contact Allergens, Cinnamic Aldehyde, and Cinnamic Alcohol
- Author:
- Smith CK, Moore CA, Elahi EN, Smart ATS and Hotchkiss SAM
- Year:
- 2 000
- Bibliographic source:
- Toxicology and Applied Pharmacology 168, 189-199
Materials and methods
Test guideline
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- The study follows some principles of the OECD Guideline 428 (skin absorption : in vitro method)
- GLP compliance:
- no
Test material
- Reference substance name:
- Heptanal, 2-(phenylmethylene)-, (2E)-
- EC Number:
- 800-696-3
- Cas Number:
- 78605-96-6
- Molecular formula:
- C14 H18 O
- IUPAC Name:
- Heptanal, 2-(phenylmethylene)-, (2E)-
- Details on test material:
- The test material typically contains >94% of the trans (E) isomer and 4-5% of the cis (Z) isomer.
Constituent 1
- Radiolabelling:
- no
Test animals
- Species:
- human
- Sex:
- female
- Details on test animals or test system and environmental conditions:
- The skin samples were obtained from six female individuals (n = 4 females, two abdomen and two breast skin samples, age range 26 -64 years) who underwent surgery at St. Mary's Hospital, London or were donors to the Stephen Kirby Skin Bank, Roehampton.
Within 1 h following excision, the tissue was washed in ice-cold 0.9% saline solution. Skin (~100 cm2) was cleaned manually of all fat and consecutive tissue using dissection scissors. Circles of skin (1.7 cm diameter) were cut using a circular sharpened steel cutter and placed in a petri dish on ice. The weights (~0.2 -0.3 g per circle) of each full-thickness skin sample were determined.
Administration / exposure
- Type of coverage:
- open
- Vehicle:
- unchanged (no vehicle)
- Duration of exposure:
- 24 or 2 hours
- Doses:
- 10 µL of cinnamaldehyde (up to 78 µM) was used
- No. of animals per group:
- Not applicable
- Control animals:
- no
- Details on study design:
- The skin samples were obtained from six female individuals (n = 4 females, two abdomen and two breast skin samples, age range 26 -64 years) who underwent surgery at St. Mary's Hospital, London or were donors to the Stephen Kirby Skin Bank, Roehampton.
Within 1 h following excision, the tissue was washed in ice-cold 0.9% saline solution. Skin (~100 cm2) was cleaned manually of all fat and consecutive tissue using dissection scissors. Circles of skin (1.7 cm diameter) were cut using a circular sharpened steel cutter and placed in a petri dish on ice. The weights (~0.2 -0.3 g per circle) of each full-thickness skin sample were determined. - Details on in vitro test system (if applicable):
- SKIN PREPARATION
- Source of skin: reduction mammoplasty (breast) or apronectomy (abdomen) operation
- Ethical approval if human skin: all skin samples were obtained with ethical approval from the Local Research Ethics Committees of St. Mary's Hospital and Stephen Kirby Skin Bank, respectively.
- Type of skin: breast or abdomen
- Preparative technique: operation
- Thickness of skin (in mm): no information
- Membrane integrity check: no information
- Storage conditions:
- Justification of species, anatomical site and preparative technique:
PRINCIPLES OF ASSAY
- Diffusion cell: yes
- Receptor fluid: 0.025 M Hepes, Hank's balanced salts solution (9.8g/l), 4 mM sodium bicarbonate, 50 mg/l gentamycin, pH7.4; degassed; and filtered using a 65-um PEFE filter (Whatman, UK) prior to use
- Solubility of test substance in receptor fluid:
- Static system: no information
- Flow-through system: yes (flowing at 2 mL/h)
- Test temperature: no information
- Humidity: no information
- Occlusion: all samples were occluded throughout the experiment
- Reference substance(s):
- Other: During 24-h experiments, each fraction was collected over 2 h; for 2-h experiments each fraction was collected over 15 min.
Results and discussion
- Signs and symptoms of toxicity:
- not specified
- Dermal irritation:
- not specified
- Absorption in different matrices:
- No data
- Total recovery:
- The total recovery of cinnamic compounds (adding together the percentage levels found to penetrate, evaporate, remain unabsorbed, or reside free within the skin) following application of 78 micro mol cinnamic aldehyde was 82.9%. The majority of the initial dose was recovered as cinnamaldehyde (62.2%); 2.8% was reduced to cinnamic alcohol and a total of 17.9% had been oxidatively metabolized to cinnamic acid.
- Conversion factor human vs. animal skin:
- Not applicable - human skin samples used in assay
Any other information on results incl. tables
During 24 h absorption of neat cinnamaldehyde, parent cinnamaldehyde was detected at low levels (80 -150 nmol/cm2skin/h) in receptor fluid in the first three 2 -h fractions and began to penetrate the skin at an increasing rate after an approximate lag time of 6 h. Levels of cinnamaldehyde-derived cinnamic alcohol (321.4 +/- 250.3 nmol/cm2skin/h) and cinnamic acid (238.0 +/- 164.0 nmol/cm2skin/h) metabolites were higher than parent cinnamaldehyde (132.9 +/- 24.6 nmol/cm2skin/h) in the first 2 -h receptor fluid fraction and maximal penetration for the two metabolites occurred between 4 and 8 h. After 8 h, the rates of penetration for cinnamic alcohol and cinnamic acid continually fell and cinnamic alcohol approached undetectable levels (limit of detection < 0.1 nmol) in the 22- to 24 -h fraction. After 12 h, the level of penetrated cinnamaldehyde became greater than the level of cinnamic alcohol metabolite and, after 18 h, parent cinnamaldehyde became the predominant cinnamic compound present in receptor fluid.
Applicant's summary and conclusion
- Conclusions:
- The skin penetration of cinnamic aldehyde in this study was 16%.
- Executive summary:
The in vitro percutaneous absorption and metabolism of cinnamaldehyde and cinnamic acid (78 micromol dose) has been examined using freshly excised, metabolically viable, full-thickness breast and abdomen skin from six female donors. Penetration rates and total recoveries of cinnamic compounds that were present in receptor fluid, extracted from within the skin, evaporated from the skin surface, or remained unabsorbed on the skin surface after 24 h were quantified by reversed-phase high-performance liquid chromatography. At the end of the 24 -h experiment for neat cinnamaldehyde application to human skin, a total of 9.4% of the initial applied dose of cinmamaldehyde had penetrated the skin as cinnamaldehyde, cinnamic alcohol, or cinnamic acid. Only cinnamaldehyde (1.0% of the initial dose) was seen to evaporate onto the occlusion cell cap after 24 h. The majority of parent cinnamaldehyde (~55%) had remained on the skin surface at the end of the experiment; ~10.6% of the initial dose had been converted to cinnamic acid and had remained on the skin surface; no cinnamic alcohol was found to be unabsorbed. Within the skin, a total of 6.6% of the initial cinnamaldehyde dose was found as either cinnamaldehyde (2.9%), cinnamic alcohol (0.4%), or cinnamic acid (3.3%). Therefore, the skin penetration of cinnamaldehyde in this study was 16% (9.4% + 6.6%).
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