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EC number: 953-046-7 | CAS number: -
- 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 vitro
- Type of information:
- (Q)SAR
- Adequacy of study:
- key study
- Study period:
- 2021
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification
- Justification for type of information:
- 1. SOFTWARE
Various tools, inter alia CASE Ultra, DEREK Nexus, OECD Toolbox, ToxRead, Toxtree, VEGA
2. MODEL (incl. version number)
Model Version Approach
CASE Ultra 1.8.0.2 Statistical/Expert
DEREK Nexus 6.0.1 Expert
OECD (Q)SAR Toolbox 4.4.1 Expert/Read-across
ToxRead 0.23beta Read-across
Toxtree 3.1.0 Expert
VEGA 1.1.5_b36 Hybrid
3. SMILES OR OTHER IDENTIFIERS USED AS INPUT FOR THE MODEL
Main components of the substance:
1) CCCCCCCC(=O)OCC(C)O
2) CCCCCCCC(=O)OC(C)CO
3) CCCCCCCC(=O)OCC(C)OC(=O)CCCCCCC
Impurities (=educts) of the substance
4) CC(O)CO
5) OCCCO
6) CCCCCCCC(=O)O
4. SCIENTIFIC VALIDITY OF THE (Q)SAR MODEL
See attached QMRF/ QPRF Report
5. APPLICABILITY DOMAIN
See attached QMRF/ QPRF Report
6. ADEQUACY OF THE RESULT
See attached QMRF/ QPRF Report
Cross-reference
- Reason / purpose for cross-reference:
- reference to same study
Reference
- Endpoint:
- skin irritation / corrosion, other
- Remarks:
- QSAR
- Type of information:
- (Q)SAR
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification
- Justification for type of information:
- 1. SOFTWARE
Various tools, inter alia CASE Ultra, DEREK Nexus, OECD Toolbox, ToxRead, Toxtree, VEGA
2. MODEL (incl. version number)
Model Version Approach
CASE Ultra 1.8.0.2 Statistical/Expert
DEREK Nexus 6.0.1 Expert
OECD (Q)SAR Toolbox 4.4.1 Expert/Read-across
ToxRead 0.23beta Read-across
Toxtree 3.1.0 Expert
VEGA 1.1.5_b36 Hybrid
3. SMILES OR OTHER IDENTIFIERS USED AS INPUT FOR THE MODEL
Main components of the substance:
1) CCCCCCCC(=O)OCC(C)O
2) CCCCCCCC(=O)OC(C)CO
3) CCCCCCCC(=O)OCC(C)OC(=O)CCCCCCC
Impurities (=educts) of the substance
4) CC(O)CO
5) OCCCO
6) CCCCCCCC(=O)O
4. SCIENTIFIC VALIDITY OF THE (Q)SAR MODEL
See attached QMRF/ QPRF Report
5. APPLICABILITY DOMAIN
See attached QMRF/ QPRF Report
6. ADEQUACY OF THE RESULT
See attached QMRF/ QPRF Report - Principles of method if other than guideline:
- - Principle of test, short description of test conditions and Parameters analysed / observed
CASE Ultra Statistical/Expert
DEREK Nexus Expert
OECD (Q)SAR Toolbox Expert/Read-across
Toxtree Expert - GLP compliance:
- no
- Test system:
- other: QSAR prediction
- Remarks on result:
- no indication of irritation
- Remarks:
- QSAR prediction
- Interpretation of results:
- study cannot be used for classification
- Conclusions:
- PGMC is finally concluded to be NON SKIN IRRITANT and NOT SKIN CORROSIVE.
- Executive summary:
Irritation and Corrosion
None of the query structures have an alert for skin and eye irritation from the rule-based expert system DEREK.
OECD Toolbox contains profiler for skin/eye irritation based on the exclusion/inclusion rules by BfR. The exclusion rules for eye/skin irritation/corrosion are based on physico-chemical cut-off values to identify chemicals that do not exhibit eye/skin irritation or corrosion potential. The parameters used for defining skin/eye irritation rules are: lipid solubility, surface tension (only skin), octanol water partition coefficient, aqueous solubility, melting point and molecular weight. Since none of the query structures met all the cut-off values Toolbox concluded the results to be undefined. The profiler with inclusion rules by BfR contains structural alerts which can be used for positive classification of chemicals causing irritation/corrosion. However, none of the query structures has such an alert or passed the exclusion rules. Additional read-across with OECD Toolbox failed because no structural similar chemicals with study results on irritation and corrosion could be obtained from the Toolbox database.
Almost the same physicochemical property limits and structural rules are used by the rule-based expert system Toxtree for estimating skin/eye irritation/corrosion (see,Table7). All query structures belong to Toxtree Group C (only molecules with CxHyOz) and have obviously not passed any the physicochemical limit values for being excluded from skin corrosion or skin irritation and are then considered to potentially cause skin corrosion or skin irritation (see,Table8)[1]. It has however to be noted that if any of the physicochemical parameter is missing, Toxtree will skip the physicochemical rules and only the structural alerts will be applied, which may result in a low quality prediction. This is in contrast to the inclusion and exclusion rules in OECD Toolbox, which consider physicochemical parameter and structural alert separately. Since no information were available for the query structures while all others were estimated using EpiSuite and US EPA Test software (see, appendix), the predictions by Toxtree are considered to be of low confidence. Moreover, the structural alerts between the OECD profiler and the structural classes of Toxtree are also different and therefore explaining the different results. 2-hydroxypropyl octanoate and propylene glycol 2-caprylate belong to the structural Toxtree class of C10–C20aliphatic alcohols which are considered potential skin irritants. This class is however not included in the inclusion rules of the OECD profiler. The Draft OECD SIDS Initial Assessment Report C6-22 primary aliphatic alcohols concludes that linear aliphatic alcohols in the range C6 – C11 are mild irritants, not anticipated to be corrosive. Aliphatic alcohols in the range C12 – C16 have a low degree of skin irritation potential; alcohols with chain lengths of C18 and above are non-irritant to skin. For the essentially linear alcohols, a differentiation in the irritation similar to that of the linear alcohols can be identified. For the alcohols in the C6- C11 range the skin irritation potential can be categorised as mild - irritant. The skin irritation potential for the higher members of the essentially linear alcohols in the range C12 – C16 is mild - essentially non-irritant. In addition, human data indicate that the irritation responses for the category of the linear alcohols are of a lower order than those observed in rabbits[12]. Therefore, the prediction by Toxtree does not validate well. Taking into account the absence of the structural class of aliphatic alcohols in the inclusion rules of the OECD Toolbox profiler, suggests no confidence in the prediction by Toxtree and the prediction are therefore dismissed. Taking into account the negative prediction by CASE Ultra for propylene glycol 2-caprylate and an inconclusive result for 2-hydroxypropyl octanoate (see,Table9), there no supporting evidence that skin irritation can be excluded, although the assessments in the OECD SIDS report suggests aliphatic alcohols to be only mild irritants.
Therefore, the outcome of the predictions for SKIN IRRITATIONof 2-hydroxypropyl octanoate and propylene glycol 2-caprylate can only be considered INCONCLUSIVE.
Toxtree assigned propylene-1,2-dioctanoate, 1,2 propanediol and 1,3 propanediol and caprylic acid to the structural class ethylene glycol ethers which are considered potential skin irritants. None of these structures is however a glycol ether. While an explanation including SMARTS definition could be obtained from the OECD Toolbox profiler (see,Figure8), the mapping in Toxtree indicates the structural alert not properly defined (see,Figure9). Overall, the structural alert of Toxtree is out of context and the predictions can therefore be dismissed.
However, the report conclusions for the educt substances 1,2/ 1,3-propanediol are clear negative and the for the caprylic acid clear positive. The latter is considered to be based on the short C-chain length and the pka of 4,89.
Taken into account the very low water solubility, the natural pH of the skin and the good metabolization of the substance PGMC, the substance is finally concluded to be NON SKIN IRRITANT and NOT SKIN CORROSIVE.
Compound |
Method |
Final Conclusion*** |
|||
|
Statistical / CASE Ultra |
Rule-based |
|
||
|
Irritation |
Corrosion |
Toxtree |
OECD Toolbox |
|
2-hydroxypropyl octanoate |
Inconclusive |
Inconclusive |
Irritating* |
No alerts |
Inconclusive |
Propylene glycol 2-caprylate |
Negative |
Negative |
Irritating* |
No alerts |
Inconclusive |
Propylene-1,2-dioctanoate |
Negative |
Negative |
Irritating* |
No alerts |
Inconclusive |
1,2 propanediol |
Inconclusive** |
Inconclusive |
Irritating* |
No alerts |
Negative |
1,3 propanediol |
Positive** |
Inconclusive |
Irritating* |
No alerts |
Negative |
Caprylic acid |
Positive |
Positive |
Irritating* |
No alerts |
Positive Corrosive |
* Dismissed due to alerts
out of context
** Negative study results in database
*** Expert opinion based on structures only, and not taking into account educt or other substance properties
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 021
- Report date:
- 2021
Materials and methods
- Principles of method if other than guideline:
- - Principle of test:, Short description of test conditions, Parameters analysed / observed:
CASE Ultra LLNA
CASE Ultra Non- LLNA
CAESAR
IRFMN/JRC
Consensus score for being sensitizer and non-sensitizer - GLP compliance:
- no
- Justification for non-LLNA method:
- QSAR study
Test material
- Reference substance name:
- Octanoic acid, monoester with 1,2-propanediol
- EC Number:
- 953-046-7
- Cas Number:
- 31565-12-5
- Molecular formula:
- not applicable to MCS
- IUPAC Name:
- Octanoic acid, monoester with 1,2-propanediol
- Test material form:
- liquid: viscous
Constituent 1
In vitro test system
- Details of test system:
- other: QSAR modelling
- Details on the study design:
- - Prediction model used:
CASE Ultra LLNA
CASE Ultra Non- LLNA
CAESAR
IRFMN/JRC
Results and discussion
In vitro / in chemico
Results
- Remarks on result:
- no indication of skin sensitisation
- Remarks:
- QSAR prediction
- Outcome of the prediction model:
- negative [in vitro/in chemico]
Any other information on results incl. tables
Consensus results for skin sensitisation from statistical-based models with reliability score s+/-and weighted reliability score s+/-·w (see, appendix) and available study results from training sets of models
Model |
Pred result (+/-) |
s+/- |
Exp result (+/-) |
s+/-·w |
Pred result (+/-) |
s+/- |
Exp result (+/-) |
s+/-·w |
2-hydroxypropyl octanoate |
1,2 propanediol |
|||||||
CASE Ultra LLNA |
- |
3 |
2.7 |
- |
3 |
- |
3 |
|
CASE Ultra Non- LLNA |
- |
2 |
1.2 |
- |
2 |
- |
3 |
|
CAESAR |
+ |
2 |
1.2 |
- |
3 |
- |
3 |
|
IRFMN/JRC |
- |
2 |
1.2 |
- |
3 |
- |
3 |
|
Consensus score Sensitiser |
0.10 |
|
|
|
0.00 |
|||
Consensus score Non-Sensitiser |
0.43 |
|
|
|
1.00 |
|||
Propylene glycol 2-caprylate |
1,3 propanediol |
|||||||
CASE Ultra LLNA |
- |
3 |
2.7 |
- |
1 |
|
0.2 |
|
CASE Ultra Non- LLNA |
Inconclusive |
- |
2 |
|
1.2 |
|||
CAESAR |
+ |
2 |
1.2 |
- |
3 |
|
2.7 |
|
IRFMN/JRC |
- |
2 |
1.2 |
+ |
1 |
|
0.2 |
|
Consensus score Sensitiser |
0.13 |
|
|
|
0.02 |
|||
Consensus score Non-Sensitiser |
0.43 |
|
|
|
0.34 |
|||
Propylene-1,2-dioctanoate |
Caprylic acid |
|||||||
CASE Ultra LLNA |
- |
2 |
1.2 |
Inconclusive |
|
|
|
|
CASE Ultra Non- LLNA |
- |
1 |
0.2 |
- |
2 |
- |
3 |
|
CAESAR |
+ |
3 |
2.7 |
- |
3 |
- |
3 |
|
IRFMN/JRC |
+ |
3 |
2.7 |
- |
3 |
- |
3 |
|
Consensus score Sensitiser |
0.45 |
|
|
|
0.00 |
|||
Consensus score Non-Sensitiser |
0.12 |
|
|
|
1.00 |
Applicant's summary and conclusion
- Interpretation of results:
- GHS criteria not met
- Conclusions:
- All three main consitutents of PGMC, namely 2-hydroxypropyl octanoate, propylene glycol 2-caprylate, propylene-1,2-dioctanoate, 1,2 propanediol, 1,3 propanediol and caprylic acid are considered NON-SENSITISER. Also all impurities are considered NON-SENSITISER.
- Executive summary:
Skin Sensitisation
No alert for skin sensitisation was identified for the six query compounds with DEREK and the expert system concluded skin sensitisation in mammal is NON-SENSITISER (Table2). Moreover, no misclassified or unclassified features were detected which indicates confidence in the predictions.
None of the six query compounds triggered an alert from the protein binding profiler for skin sensitisation in OECD Toolbox. Negative study results for skin sensitisation of 1,2 propanediol, 1,3 propanediol and caprylic acid were included in the OECD Toolbox database. Read-across was performed for 2-hydroxypropyl octanoate, propylene glycol 2-caprylate and propylene-1,2-dioctanoate. According to the profiling result, 2-hydroxypropyl octanoate may act as prohapten with one metabolite triggering a structural alert for ketones which could interact with proteins via nucleophilic addition (see,Figure3). The profiler refers to a 3rd party expert stating that simple ketones are usually too weakly reactive to sensitise unless log Kowis very high and which was taken into account in the TIMES SS model by defining a threshold of log Kow> 4 for weak skin sensitizers. This is substantiated by the category members used for read-across. All four analogues are likely to be subject of biotic transformation to simple ketones and have a log Kow< 4, except 2-undecanol which is reported to be a weak sensitiser, while another study result indicates the substance to be not sensitising. This indicates that the log Kowof 2-hydroxypropyl octanoate and its ketone metabolite respectively, is too low to sensitise.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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