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EC number: 205-524-5 | CAS number: 142-16-5
- 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
In the absence of significant data with dioctyl maleate itself, a weight of evidence approach was applied. Because of the chemical similarities of dioctyl maleate to n-butyl maleate and dibutyl maleate, the available repeated-dose toxicity data should be sufficient for read-across assessment. Animal studies showed that the main target organs were the kidneys. A 90-day oral study in rats with dibutyl maleate revealed the most severe systemic effects (CPN). Therefore, the LOAEL of 30 mg/kg/day was selected for the derivation of the DNEL for long systemic effects.
Key value for chemical safety assessment
Repeated dose toxicity: via oral route - systemic effects
Endpoint conclusion
- Dose descriptor:
- LOAEL
- 30 mg/kg bw/day
- Study duration:
- subchronic
- Species:
- rat
Additional information
In the absence of significant data with dioctyl maleate itself, a weight of evidence approach was applied to assess the substance for repeated-dose systemic toxicity. N-butyl maleate and dibutyl maleate are close analogues of dioctyl maleate and all are associated to maleic acid. Because of the chemical similarity of these alkyl diesters, the available repeated dose toxicity data should be sufficient for read-across assessment.
The only available study with dioctyl maleate regarding this endpoint was a 28-day combined repeated-dose and toxicity study with reproductive/developmental toxicity screening test which showed low toxicity. The main target organs were the kidneys and liver. The parental NOAEL was 300 mg/kg bw/day and the reproductive/developmental NOAEL was 1000 mg/kg/day.
For the purpose of the read cross assessment, a two-week study with n-butyl maleate was evaluated. This study was conducted to evaluate the potential renal toxicity of n-butyl maleate due to its association to maleic acid which is known to induce nephrotoxicity in the rat. Based on the results, n-butyl maleate showed mild renal toxicity. The NOAEL was determined to be 30 mg/kg/day.
In addition, a 90-day oral subchronic toxicity study with dibutyl maleate was evaluated. This study showed increased kidney weights in males and females at 300 mg/kg/day on Day 91 and was persisted in the males at 300 mg/kg/day on Day 105 (recovery). These increased kidney weights correlated histologically to chronic progressive nephropathy (CPN) as well as tubular basophilia within the renal cortex. The renal lesions included CPN, mineralization at the corticomedullary junction and/or medulla, tubular basophilia within the cortex, and tubular ectasia in the cortex and/or medulla. Overall, oral administration of DBM to rats for 90 days was associated with persistent kidney findings at all doses during the recovery phase. Due to these persistent findings, the LOAEL was established at 30 mg/kg/day.
Collectively, the 90-day study in rats with dibutyl maleate revealed the most severe systemic effects (CPN). Therefore, the LOAEL of 30 mg/kg/day was selected for the derivation of the DNEL for long systemic effects.
Justification for classification or non-classification
According to Regulation (EC) No 1272/2008 and based on the read across assessment with dibutyl maleate which exhibited chronic progressive nephropathy (CPN) and mineralization in the kidneys in the 90-day oral subchronic toxicity study in rats, dioctyl maleate is classified category 2 for STOT-RE.
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