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EC number: 283-393-3 | CAS number: 84608-82-2
- 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
Toxicity to aquatic algae and cyanobacteria
Administrative data
- Endpoint:
- toxicity to aquatic algae and cyanobacteria
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 03 - 06 Dec 2018
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- guideline study without detailed documentation
- Remarks:
- Considerable deficiencies in test medium preparation and analytical method.
Data source
Referenceopen allclose all
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 018
- Report date:
- 2018
- Reference Type:
- study report
- Title:
- Unnamed
- Report date:
- 2018
Materials and methods
Test guidelineopen allclose all
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 201 (Freshwater Alga and Cyanobacteria, Growth Inhibition Test)
- Version / remarks:
- Adopted 23 Mar 2006
Corrected 28 Jul 2006 - Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method C.3 (Algal Inhibition test)
- Version / remarks:
- Adopted 07 Dec 2015
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- other: Guidance Document on Aquatic Toxicity Testing of Difficult Substances And Mixtures
- Version / remarks:
- Adopted 14 Dec 2000
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- Landesamt für Umwelt, Rheinland Pfalz, Germany (15.05.2018)
Test material
- Reference substance name:
- 2-hydroxy-3-(oleoyloxy)propyl 5-oxo-L-prolinate
- EC Number:
- 283-393-3
- EC Name:
- 2-hydroxy-3-(oleoyloxy)propyl 5-oxo-L-prolinate
- Cas Number:
- 84608-82-2
- Molecular formula:
- C26H45NO6
- IUPAC Name:
- 2-hydroxy-3-(oleoyloxy)propyl 5-oxo-L-prolinate
Constituent 1
Sampling and analysis
- Analytical monitoring:
- yes
- Remarks:
- LC-MS-MS
- Details on sampling:
- - Concentrations: All concentrations, at test start (0 h) and every 24 h
- Sampling method: At test start, samples for the analytical determination were taken before the addition of the algal inoculum. Then, samples were taken every 24 h until test end (72 h). Algal cells were eliminated from the samples by centrifugation before analytical determination.
Test solutions
- Vehicle:
- no
- Details on test solutions:
- PREPARATION AND APPLICATION OF TEST SOLUTION
- Method: A water-accommodated fraction (WAF) was prepared by weighing the test item with the help of a cover glass into a corresponding amount of algal medium (demineralised water enriched with minerals) to obtain a stock WAF with a nominal concentration of 100.2 mg/L, which was then shaken at 100 rpm for 3 d on an orbital shaker. The test item was applied in thin layer to achieve a large surface for contact with aqueous medium. The resulting solution was centrifuged because the solution was turbid (deviation from study plan). The lower test item concentrations were prepared by dilution of this stock WAF with algal medium. The WAFs were prepared individually and not by serial dilution of the stock WAF (see "Any other information on materials and methods incl. tables").
- Differential loading: No
- Controls: Algal medium without test item
Test organisms
- Test organisms (species):
- Desmodesmus subspicatus (previous name: Scenedesmus subspicatus)
- Details on test organisms:
- TEST ORGANISM
- Common name: Unicellular freshwater green alga
- Strain: 86.81 (SAG number)
- Source: MBM Sciencebridge GmbH (Institut für Pflanzenphysiologie of University of Göttingen, Germany), Jan 2016
- Method of cultivation: The algae are kept as stock culture on solid agar at 2 - 8 °C. From this stock culture, a permanent culture was prepared. The pre-culture for this test was prepared from an aliquot of the permanent culture.
- Age of inoculum at test start: 4 d.
Study design
- Test type:
- static
- Water media type:
- freshwater
- Limit test:
- no
- Total exposure duration:
- 72 h
Test conditions
- Test temperature:
- 21.3 - 22.8 °C
- pH:
- Control: 7.6 (0 h) and 8.4 (72 h)
Treatments: 7.1 - 7.6 (0 h) and 7.6 - 8.1 (72 h) - Nominal and measured concentrations:
- Control, 1.0, 3.2, 10, 32 and 100 mg/L (nominal loading rate WAF)
Control, 0.002, 0.006, 0.018, 0.058 and 0.183 µg/L (concentratins calculated based on geometric mean of the highest treatment)
Comment: After 24 and 48 h, the test item was only detectable in the highest concentration and at the end of the test, no test item was detected in any treatment. The measured concentration in the highest concentration at 48 h was slightly below the LOQ but was still used for the calculation of the geometric mean due to the clarity of its peak. The lower concentrations were derived from the geometric mean of the measured concentration in the highest treatment and the respective dilution factors. For details, refer to "Any other information on results incl. tables". - Details on test conditions:
- TEST SYSTEM
- Test vessel: 65 mL glass flasks were filled with 45 ± 1 mL test medium and covered with perforated plastic foil.
- Initial cell density: 2620
- Control end cell density: Mean = 339203, S.D. = 24513
- No. of vessels per concentration (replicates): 3
- No. of vessels per control (replicates): 6
GROWTH MEDIUM
- Standard medium used: Yes, the algal medium used corresponded to the OECD TG 201 medium.
TEST MEDIUM / WATER PARAMETERS
- Source/preparation of dilution water: The algal medium was prepared with deionised water.
- Culture medium different from test medium: Culture medium same as test medium.
- Intervals of water quality measurement: 0 and 72 h
OTHER TEST CONDITIONS
- Photoperiod: Continuous
- Light intensity: 5000 lux (0 - 72 h)
EFFECT PARAMETERS MEASURED:
- Determination of cell concentrations: Electronic particle counter
- Measurement interval: 0, 24, 48 and 72 h
- Microscopical observations: The appearance of the cells was visually assessed at the end of the test (72 h).
TEST CONCENTRATIONS
- Spacing factor for test concentrations: 3.2
- Range finding study: Yes, non-GLP.
- Results used to determine the conditions for the definitive study: Yes, the test concentrations of the definitive test were based on the results of the non-GLP pre-test. Slight but statistically significant inhibition was observed at the loading rate of 1 mg/L. - Reference substance (positive control):
- yes
- Remarks:
- Potassium dichromate (K2 Cr2 O7, CAS 7778-50-9)
Results and discussion
Effect concentrations
- Duration:
- 72 h
- Dose descriptor:
- EL50
- Effect conc.:
- > 100 mg/L
- Nominal / measured:
- nominal
- Conc. based on:
- test mat.
- Remarks:
- Water Accommodated Fraction
- Basis for effect:
- growth rate
- Details on results:
- - Exponential growth in the control: Yes
- Observation of abnormalities: Normal and healthy appearance in all treatments. No cells were observed at the highest loading rate (100 mg/L).
- Effect concentrations exceeding solubility of substance in test medium: No - Results with reference substance (positive control):
- - Results with reference substance valid? Yes
- ErC50 (72 h) for K2Cr2O7: 0.79 mg/L, 95% confidence interval: 0.79 - 0.79 mg/L
- Other: The EC50 (72 h) for potassium dichromate was determined in a separate reference test performed in January 2018 (GLP). - Reported statistics and error estimates:
- Statistical analyses were conducted with ToxRat® Professional, v.3.2.1.
The following tests were applied: Shapiro-Wilk's Test on Normal Distribution, Levene's Test on Variance Homogeneity (with residuals), Trend analysis by Contrasts (Monotonicity of Concentration/Response), Williams Multiple Sequential t-test Procedure, Analysis of Variance and Test for Lack of Fit for the 3-param. normal CDF
Any other information on results incl. tables
VALIDITY CRITERIA
The study fulfilled the validity criteria laid down by the guideline (Table 1).
Table 1: Validity criteria for OECD 201.
Criterion from the guideline |
Outcome |
Validity criterion fulfilled |
The biomass in the control cultures should have increased exponentially by a factor of at least 16 within the 72-hour test period. |
Observed factor: 129 |
Yes |
The mean coefficient of variation for section-by-section specific growth rates (days 0-1, 1-2 and 2-3, for 72-hour tests) in the control cultures must not exceed 35% |
Observed value: 30% |
Yes |
The coefficient of variation of average specific growth rates during the whole test period in replicate control cultures must not exceed 7% in tests with Pseudokirchneriella subcapitata and Desmodesmus subspicatus. For other less frequently tested species, the value should not exceed 10%. |
Observed value: 2% |
Yes |
ANALYTICAL RESULTS
At the start and after every 24 h, the test item concentrations were measured in the test media by LC-MS. However, in the present study a different LC-MS was used for the actual measurement than was used for the validation due to equipment failure.
MEASURED CONCENTRATIONS
At the beginning of the test (0 h), the test item could be analytically determined in samples from the 10 – 100 mg/L (nominal) treatments. Due to the very poor solubility, the test item was not detected in lower concentrations. After 24 and 48 h, the test item was only detectable in the highest concentration. At the end of the test, no test item was detectable in any treatment (Table 2).
CALCULATION OF THE GEOMETRIC MEAN MEASURED CONCENTRATIONS
The geometric mean was calculated by multiplication of the n concentrations and taking the nthroot thereof. According to the report, the measured concentration in the highest treatment at 48 h (0.15 µg/L) was slightly below the LOQ (0.2 µg/L) but because the measured peak of the test item was clear, it was still used for the calculation of the geometric mean of the highest concentration (Table 3). For the calculation of the geometric mean value of the highest test concentration, the test facility used half the LOQ (= 0.1 µg/L) for the 72 h – value. The geometric mean measured values for the lower concentrations were then derived from this calculated geometric mean of the highest test concentration (nominal 100 mg/L) using the respective dilution factors. The test facility justified this procedure with the preparation method of the lower concentration treatments, which were prepared by dilution of the stock WAF (100 mg/L nominal).
Due to considerable deficiencies in the preparation of test media and in the analytical method, only the results for the highest test concentration were considered in the present dossier.
Table 2. Measured test item concentrations.
Nominal test item concentration [mg/L] |
Measured test item concentrations [µg/L] |
|||
0 h |
24 h |
48 h |
72 h |
|
Blank control |
< LOQ |
< LOQ |
< LOQ |
< LOQ |
1.0 |
< LOQ |
< LOQ |
< LOQ |
< LOQ |
3.2 |
< LOQ |
< LOQ |
< LOQ |
< LOQ |
10 |
0.38 |
< LOQ |
< LOQ |
< LOQ |
32 |
0.23 |
< LOQ |
< LOQ |
< LOQ |
100 |
0.42 |
0.18* |
0.15* |
< LOQ |
LOQ = 0.2 µL
* Value slightly below the LOQ but nonetheless used for evaluation due to the clarity of the measured peak.
Table 3. Geometric mean and calculated concentrations.
Nominal test item concentration |
Geometric mean |
Calculated concentration based on geometric mean |
[mg/L] |
[µg/L] |
[µg/L] |
Blank control |
-- |
-- |
1.0 |
-- |
0.002 |
3.2 |
-- |
0.006 |
10 |
-- |
0.018 |
32 |
-- |
0.058 |
100 |
0.183 |
0.183 |
BIOLOGICAL RESULTS
Significant inhibition of algal growth was observed at 32 – 100 mg/L (nominal) (Table 4). Since the test item is not soluble, the EC50 value for growth rate inhibition is reported as a range instead of the exact value extrapolated by the software (Table 5 and 6).
Due to considerable deficiencies in the preparation of test media and in the analytical method, only the nominal EC50 (72 h) was considered as effect value in the present dossier.
Table 4. Inhibition Values at the end of the test (72 h)
Nominal test item concentration [mg/L] |
Replicate |
Inhibition of Growth Rate µ (72 h) |
Inhibition of Yield (72 h) |
Blank control |
1 |
-0.65 |
-3.01 |
2 |
-1.47 |
-7.25 |
|
3 |
-1.49 |
-7.33 |
|
4 |
1.86 |
8.93 |
|
5 |
0.01 |
0.27 |
|
6 |
1.74 |
8.37 |
|
Mean |
0 |
0 |
|
SD |
1.50 |
7.28 |
|
1.0 |
1 |
3.24 |
14.88 |
2 |
-2.36 |
-11.99 |
|
3 |
2.68 |
12.53 |
|
Mean |
1.19 |
5.14 |
|
SD |
3.08 |
14.88 |
|
3.2 |
1 |
-2.27 |
-11.50 |
2 |
1.11 |
5.50 |
|
3 |
-2.02 |
-10.17 |
|
Mean |
-1.06 |
-5.39 |
|
SD |
1.88 |
9.45 |
|
10 |
1 |
3.95 |
17.80 |
2 |
0.43 |
2.30 |
|
3 |
-0.66 |
-3.05 |
|
Mean |
1.24 |
5.68 |
|
SD |
2.41 |
10.83 |
|
32 |
1 |
1.18 |
5.84 |
2 |
4.63 |
20.47 |
|
3 |
6.08 |
25.96 |
|
Mean |
3.96 |
17.43 |
|
SD |
2.52 |
10.40 |
|
100 |
1 |
43.36 |
88.56 |
2 |
47.63 |
90.85 |
|
3 |
52.66 |
93.01 |
|
Mean |
47.88 |
90.81 |
|
SD |
4.66 |
2.22 |
SD = standard deviation
Table 5. Summary of effect values (based on nominal values).
Parameter |
Value |
95% confidence interval |
NOEC (72 h) – growth rate |
10 mg/L |
-- |
NOEC (72 h) – yield |
10 mg/L |
-- |
LOEC (72 h) – growth rate |
32 mg/L |
-- |
LOEC (72 h) – yield |
32 mg/L |
-- |
ErC10 (72 h) |
44.57 mg/L |
36.57 – 54.30 mg/L |
EyC10 (72 h) |
27.41 mg/L |
20.48 – 36.67 mg/L |
ErC50 (72 h) |
> 100 mg/L |
-- |
EyC50 (72 h) |
51.85 mg/L |
36.94 – 72.22 mg/L |
Table 6. Summary of effect values (based on measured values).
Parameter |
Value |
95% confidence interval |
NOEC (72 h) – growth rate |
0.018 µg/L |
-- |
NOEC (72 h) – yield |
0.018 µg/L |
-- |
LOEC (72 h) – growth rate |
0.058 µg/L |
-- |
LOEC (72 h) – yield |
0.058 µg/L |
-- |
ErC10 (72 h) |
0.08 µg/L |
0.07 – 0.10 µg/L |
EyC10 (72 h) |
0.05 µg/L |
0.03 – 0.06 µg/L |
ErC50 (72 h) |
> 0.183 µg/L |
-- |
EyC50 (72 h) |
0.09 µg/L |
0.08 – 0.12 µg/L |
Applicant's summary and conclusion
- Validity criteria fulfilled:
- yes
- Remarks:
- For further details please refer to “Any other information on results incl. tables”.
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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