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EC number: 270-470-1 | CAS number: 68441-66-7
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Endpoint summary
Administrative data
Description of key information
Skin irritation - in vitro
Decanoic acid, mixed esters with dipentaerythritol, octanoic acid and valeric acid is non-irritant in the in vitro skin irritation test.
Eye irritation-In vitro
Decanoic acid, mixed esters with dipentaerythritol, octanoic acid and valeric acid is non-irritant in the EpiOcular™ test.
Key value for chemical safety assessment
Skin irritation / corrosion
Link to relevant study records
- Endpoint:
- skin irritation: in vitro / ex vivo
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 01 Feb 2021 to 08 Feb 2021
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 439 (In Vitro Skin Irritation: Reconstructed Human Epidermis Test Method)
- Version / remarks:
- OECD Guideline 439. In vitro Skin Irritation: Reconstructed Human Epidermis Test Method, (corrected 26 June 2020).
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method B.46 (In Vitro Skin Irritation: Reconstructed Human Epidermis Model Test)
- Version / remarks:
- EC Guideline No. 440/2008. Part B: Methods for the Determination of Toxicity and other health effects, Guideline B.46 “In vitro Skin Irritation: Reconstructed Human Epidermis Model Test ". Official Journal of the European Union No. L142; Amended by EC No. 2019/1390 OJ No. L247, 26 September 2019.
- Deviations:
- no
- GLP compliance:
- yes
- Specific details on test material used for the study:
- No further details specified in the study report.
- Test system:
- human skin model
- Source species:
- human
- Cell type:
- non-transformed keratinocytes
- Cell source:
- other: three-dimensional human epidermis model
- Source strain:
- not specified
- Details on animal used as source of test system:
- Test System
EPISKIN Small ModelTM (EPISKIN-SMTM), 0.38 cm2.
This model is a three-dimensional human epidermis model, which consists of adult human derived epidermal keratinocytes which have been seeded on a dermal substitute consisting of a collagen type I matrix coated with type IV collagen. The keratinocytes are cultured for 13-days, which results in a highly differentiated and stratified epidermis model comprising the main basal, supra basal, spinous and granular layers and a functional stratum corneum.
Source
SkinEthic Laboratories, Lyon, France. - Justification for test system used:
- In the interest of sound science and animal welfare, a sequential testing strategy is recommended to minimize the need of in vivo testing. One of the validated in vitro skin irritation tests is the EPISKIN test, which is recommended in international guidelines (e.g. OECD and EC).
- Vehicle:
- unchanged (no vehicle)
- Details on test system:
- Experimental Design
Test for the Interference of the Test Item with the MTT Endpoint
A test item may interfere with the MTT endpoint if it is colored and/or it is able to directly reduce MTT. The cell viability measurement is affected only if the test item is present on the tissues when the MTT viability test is performed.
Test for Color Interference by the Test Item
The test item was checked for possible color interference before the study was started. Some non-colored test items may change into colored items in aqueous conditions and thus stain the tissues during the exposure. To assess the color interference, 50 μL of the test item or 50 μL sterile Milli-Q water as a negative control was added to 1.0 mL Milli-Q water. The mixture was incubated for at least 1 hour at 37.0 ± 1.0°C in the dark. Furthermore, 50 μL of the test item or 50 μL sterile Milli-Q water as a negative control was added to 2.0 mL isopropanol.
The mixture was incubated for 2 - 3 hours at room temperature with gentle shaking.
At the end of the exposure time, the mixtures were centrifuged for 30 seconds at 16000 g if needed and the absorbance of the solutions was determined spectrophotometrically at 570 nm in duplicate with the TECAN Infinite® M200 Pro Plate Reader.
If after subtraction of the negative control, the OD for the test item solution is >0.08, the test item is considered as possibly interacting with the MTT measurement.
Test for Reduction of MTT by the Test Item
The test item was checked for possible direct MTT reduction before the study was started. To assess the ability of the test item to reduce MTT, 50 μL of the test item was added to 1 mL MTT solution (1 mg/mL MTT in phosphate buffered saline). The mixture was incubated for approximately 3 hours at 37.0 ± 1.0°C in the dark. A negative control, 50 μL sterile Milli-Q water was tested concurrently. If the MTT solution color turned blue / purple or if a blue /purple precipitate was observed the test item interacts with MTT.
Test System Set Up
On the day of receipt the tissues were transferred to 12-well plates and pre-incubated with pre-warmed Maintenance Medium for approximately 22.5 hours at 37°C.
Maintenance medium and Assay medium were supplied by Skinethic Laboratories, Lyon, France.
MTT medium
MTT concentrate (Sigma Aldrich, Zwijndrecht, The Netherlands; 1 mg/mL in PBS) diluted (3x) in Assay medium (final concentration 0.3 mg/mL).
Environmental conditions
All incubations, with the exception of the test item incubation of 15 minutes at room temperature, were carried out in a controlled environment, in which optimal conditions were a humid atmosphere of 80 - 100% (actual range 68 - 93%), containing 5.0 ± 0.5% CO2 in air in the dark at 37.0 ± 1.0°C (actual range 35.6 - 37.0°C). Temperature and humidity were continuously monitored throughout the experiment. The CO2 percentage was monitored once on each working day. Temporary deviations from the temperature, humidity and CO2 percentage may occur due to opening and closing of the incubator door. Based on laboratory historical data these deviations are considered not to affect the study integrity.
Test Item Preparation
No correction was made for the purity/composition of the test item.
The liquid test item was applied undiluted (25 μL) directly on top of the tissue.
Application/Treatment of the Test Item
The test was performed on a total of 3 tissues per test item together with negative and positive controls. Twenty five μL of the undiluted test item was added into 12-well plates on top of the skin tissues. Three tissues were treated with 25 μL PBS (negative control) and 3 tissues with 25 μL 5% SDS (positive control) respectively. The positive control was re-spread after 7 minutes contact time. Negative and positive controls were shared with parallel studies. All information pertaining to shared tissues are archived in the raw data.
After the exposure period of 15 ± 0.5 minutes at room temperature, the tissues were washed with phosphate buffered saline to remove residual test item. After rinsing, the cell culture inserts were each dried carefully and moved to a new well on 2 mL pre-warmed maintenance medium until all tissues were dosed and rinsed. Subsequently the skin tissues were incubated for 42 ± 1 hours at 37°C.
Cell Viability Measurement
After incubation, cell culture inserts were dried carefully to remove excess medium and were transferred into a 12-wells plate prefilled with 2 mL MTT-solution (0.3 mg/mL in PBS). The tissues were incubated for 3 hours at 37°C. After incubation the tissues were placed on blotting paper to dry the tissues. Total biopsy was made by using a biopsy punch. Epidermis was separated from the collagen matrix and both parts were placed in pre-labeled microtubes and extracted with 500 μL isopropanol (Merck, Darmstadt, Germany). Tubes were stored refrigerated and protected from light for approximately 68 hours. The amount of extracted formazan was determined spectrophotometrically at 570 nm in duplicate with the TECAN Infinite® M200 Pro Plate Reader. - Control samples:
- yes, concurrent negative control
- yes, concurrent positive control
- yes, concurrent MTT non-specific colour control
- Amount/concentration applied:
- Twenty five μL of the undiluted test item was added into 12-well plates on top of the skin tissues. Three tissues were treated with 25 μL PBS (negative control) and 3 tissues with 25 μL 5% SDS (positive control) respectively.
- Duration of treatment / exposure:
- 15 ± 0.5 minutes at room temperature
- Duration of post-treatment incubation (if applicable):
- 42 ± 1 hours at 37°C
- Number of replicates:
- The test is performed on a total of 3 tissues per test item together with a negative control and positive control.
- Irritation / corrosion parameter:
- % tissue viability
- Run / experiment:
- Mean - Test item
- Value:
- 101
- Vehicle controls validity:
- not examined
- Negative controls validity:
- valid
- Positive controls validity:
- valid
- Irritation / corrosion parameter:
- other: Optical density
- Run / experiment:
- Mean - Test item
- Value:
- 1.254
- Vehicle controls validity:
- not examined
- Negative controls validity:
- valid
- Positive controls validity:
- valid
- Other effects / acceptance of results:
- The test item was checked for color interference in aqueous conditions. Addition of the test item to Milli-Q and isopropanol resulted after subtraction of the blank in an OD of -0.0006 and -0.0011, respectively. Therefore it was concluded that the test item did not induce color interference.
In addition, because no color change was observed in the presence of MTT it was concluded that the test item did not interact with the MTT endpoint.
Skin irritation is expressed as the remaining cell viability after exposure to the test item. The relative mean tissue viability obtained after 15 ± 0.5 minutes treatment with the test item compared to the negative control tissues was 101%. Since the mean relative tissue viability for the test item was above 50% the test item is considered to be non-irritant.
The positive control had a mean cell viability after 15 ± 0.5 minutes exposure of 6.6%. The absolute mean OD570 of the negative control tissues was within the laboratory historical control data range. The standard deviation value of the percentage viability of three tissues treated identically was ≤ 7.4%, indicating that the test system functioned properly. - Interpretation of results:
- GHS criteria not met
- Conclusions:
- In conclusion, Decanoic acid, mixed esters with dipentaerythritol, octanoic acid and valeric acid is non-irritant in the in vitro skin irritation test under the experimental conditions described in this report and should not be classified according to the Globally Harmonized System of Classification and Labeling of Chemicals (GHS) of the United Nations.
- Executive summary:
The objective of this study was to evaluate Decanoic acid, mixed esters with dipentaerythritol, octanoic acid and valeric acid for its ability to induce skin irritation on a human three-dimensional epidermal model (EPISKIN Small model (EPISKIN-SMTM)). The possible skin irritation potential of the test item was tested through topical application for 15 minutes.
The study procedures described in this report were based on the most recent OECD and EC guidelines.
Batch 2019194336 of the test item was a clear light yellow liquid. The test item was applied undiluted (25 μL), directly on top of the skin tissue for 15 ± 0.5 minutes. After a 42 ± 1 hour post-incubation period, determination of the cytotoxic (irritancy) effect was performed.
Cytotoxicity is expressed as the reduction of mitochondrial dehydrogenase activity measured by formazan production from MTT at the end of the treatment.
Skin irritation is expressed as the remaining cell viability after exposure to the test item. The relative mean tissue viability obtained after 15 ± 0.5 minutes treatment with the test item compared to the negative control (phosphate buffered saline) tissues was 101%. Since the mean relative tissue viability for the test item was above 50% after 15 ± 0.5 minutes treatment the test item is considered to be non-irritant.
The positive control (5% sodium dodecyl sulfate) had a mean cell viability of 6.6% after 15 ± 0.5 minutes exposure. The absolute mean OD570 (optical density at 570 nm) of the negative control tissues was within the laboratory historical control data range. The standard deviation value of the percentage viability of three tissues treated identically was ≤ 7.4%, indicating that the test system functioned properly.
In conclusion, Decanoic acid, mixed esters with dipentaerythritol, octanoic acid and valeric acid is non-irritant in the in vitro skin irritation test under the experimental conditions described in this report and should not be classified according to the Globally Harmonized System of Classification and Labelling of Chemicals (GHS) of the United Nations.
Reference
Mean Adsorption in the In Vitro Skin irritation Test with Decanoic acid, mixed esters with dipentaerythritol, octanoic acid and valeric acid
|
A (OD570) |
B (OD570) |
C (OD570) |
Mean (OD570) |
|
SD |
Negative control |
1.134 |
1.295 |
1.289 |
1.239 |
± |
0.092 |
Test item |
1.323 |
1.224 |
1.216 |
1.254 |
± |
0.059 |
Positive control |
0.033 |
0.056 |
0.157 |
0.082 |
± |
0.066 |
OD = optical density
SD = Standard deviation
Triplicate exposures are indicated by A, B and C.
In this table the values are corrected for background adsorption (0.042). Isopropanol was used to measure the background adsorption.
Mean Tissue Viability in the In Vitro Skin irritation Test with Decanoic acid, mixed esters with dipentaerythritol, octanoic acid and valeric acid
|
Mean tissue viability (percentage of control) |
Standard deviation (percentage) |
Negative control |
100 |
7.4 |
Test item |
101 |
4.8 |
Positive control |
6.6 |
5.3 |
Individual OD (ODraw) Measurements at 570 nm
|
A (OD570) |
B (OD570) |
C (OD570) |
Negative control OD570measurement 1 OD570measurement 2 |
1.1993 1.1523 |
1.2600 1.4152 |
1.3479 1.3144 |
Test item OD570measurement 1 OD570measurement 2 |
1.3476 1.3822 |
1.2272 1.3053 |
1.2457 1.2702 |
Positive control OD570measurement 1 OD570measurement 2 |
0.0733 0.0777 |
0.0900 0.1062 |
0.1938 0.2048 |
OD = Optical density
Triplicate exposure are indicated by A, B and C.
Historical Control Data for In Vitro Skin Irritation Studies
|
Negative control (adsorption; OD570) |
Positive control (adsorption; OD570) |
Range |
0.507 – 1.426 |
0.026 – 0.549 |
Mean |
1.020 |
0.108 |
SD |
0.155 |
0.087 |
n |
147 |
147 |
SD = Standard deviation
n = Number of observations
The above mentioned historical control data range of the controls were obtained by collecting all data over the period of November 2017 to November 2020.
Endpoint conclusion
- Endpoint conclusion:
- no adverse effect observed (not irritating)
Eye irritation
Link to relevant study records
- Endpoint:
- eye irritation: in vitro / ex vivo
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 19 Feb 2021 to 21 Feb 2021
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 492 (Reconstructed Human Cornea-like Epithelium (RhCE) Test Method for Identifying Chemicals Not Requiring Classification and Labelling for Eye Irritation or Serious Eye Damage)
- Version / remarks:
- OECD Guideline 492: Reconstructed Human Cornea-like Epithelium (RhCE) Test Method for Identifying Chemicals Not Requiring Classification and Labelling for Eye Irritation or Serious Eye Damage, (Adopted June 18, 2019).
- Deviations:
- no
- GLP compliance:
- yes
- Specific details on test material used for the study:
- No further details specified in the study report.
- Species:
- human
- Strain:
- other: Not applicable
- Details on test animals or tissues and environmental conditions:
- Test System
EpiOcular™ (OCL-200-EIT MatTek Corporation, Lot: 31775, Kit E.
The EpiOcular tissue construct is a non-keratinized epithelium (0.6 cm2) prepared from normal human keratinocytes (MatTek). It models the cornea epithelium with progressively stratified, but not cornified cells. These cells are not transformed or transfected with genes to induce an extended life span in culture. The “tissue” is prepared in inserts with a porous membrane through which the nutrients pass to the cells. A cell suspension is seeded into the insert in specialized medium. After an initial period of submerged culture, the medium is removed from the top of the tissue so that the epithelial surface is in direct contact with the air. This allows the test material to be directly applied to the epithelial surface in a fashion similar to how the corneal epithelium would be exposed in vivo.
Environmental conditions
All incubations, were carried out in a controlled environment, in which optimal conditions were a humid atmosphere of 80 - 100% (actual range 49 - 93%), containing 5.0 ± 0.5% CO2 in air in the dark at 37.0 ± 1.0 °C (actual range 35.7 - 36.9 °C). Temperature and humidity were continuously monitored throughout the experiment. The CO2 percentage was monitored once on each working day. Temporary deviations from the temperature, humidity and CO2 percentage may occur due to opening and closing of the incubator door. Based on laboratory historical data these deviations are considered not to affect the study integrity. - Vehicle:
- unchanged (no vehicle)
- Controls:
- yes, concurrent positive control
- yes, concurrent negative control
- Amount / concentration applied:
- Two tissues were treated with 50 μL Milli-Q water (negative control) and 2 tissues with 50 μL Methyl Acetate (positive control) respectively.
Fifty μL of the undiluted test item was added into the 6-well plates on top of the tissues. - Duration of treatment / exposure:
- 30 ± 2 minutes at 37.0 ± 1.0 °C
- Duration of post- treatment incubation (in vitro):
- 12 ± 2 minute immersion incubation at room temperature (Post- Soak).
After the Post-Soak period cell culture inserts were each dried carefully and transferred to the 6-well plate containing 1.0 mL of warm Assay Medium and were incubated for 120 ± 15 minutes at 37 °C. - Number of animals or in vitro replicates:
- The test was performed on a total of 2 tissues per test item together with a negative control and positive control.
- Details on study design:
- Experimental Design
Test for the Interference of the Test Item with the MTT Endpoint
A test item may interfere with the MTT endpoint if it is colored and/or it is able to directly reduce MTT. The cell viability measurement is affected only if the test item is present on the tissues when the MTT viability test is performed. The test item has been tested previously for possible direct MTT reduction and color interference in the Skin irritation test using EpiSkinTM as a skin model (Test Facility Study No. 20285127).
The solutions were not turned blue / purple nor a blue / purple precipitate was observed in the presence of MTT, therefore it was concluded that the test item did not interfere with the MTT endpoint.
The Optical Density (OD) for the test item solution was ≤0.08, therefore it was concluded that the test item did not interact with the MTT measurement.
Test System Set Up
On the day of receipt the tissues were equilibrated (in its 24-well shipping container) to room temperature. Subsequently, tissues were transferred to 6-well plates and incubated for 20 ± 4 hours at 37 °C in 1.0 mL fresh pre-warmed Assay Medium. Assay Medium was supplied by MatTek Corporation, Ashland, USA.
DMEM (Dulbecco’s Modified Eagle’s Medium) Supplemented DMEM medium, serum-free supplied by MatTek Corporation.
MTT medium
MTT concentrate (5 mg/mL) diluted (1:5) with MTT diluent.
Test Item Preparation
No correction was made for the purity/composition of the test item.
The liquid test item was applied undiluted (50 μL) directly on top of the tissue.
Any residual volumes were discarded.
Application/Treatment of the Test Item
The test was performed on a total of 2 tissues per test item together with a negative control and positive control.
Before the assay was started the entire tissues were pre-wetted with 20 μL of Ca2+Mg2+-Free-D-PBS. The tissues were incubated at standard culture conditions for a minimum of 30 minutes.
Two tissues were treated with 50 μL Milli-Q water (negative control) and 2 tissues with 50 μL Methyl Acetate (positive control) respectively.
Fifty μL of the undiluted test item was added into the 6-well plates on top of the tissues.
After the exposure period with the test item (30 ± 2 minutes at 37.0 ± 1.0 °C), the tissues were thoroughly rinsed with Ca2+Mg2+-free D-PBS (brought to room temperature) to remove residual test item.
After rinsing the cell culture inserts were each dried carefully and immediately transferred to and immersed in 5 mL of previously warmed Assay Medium (room temperature) in a prelabeled 12-well plate for a 12 ± 2 minute immersion incubation at room temperature (Post- Soak). After the Post-Soak period cell culture inserts were each dried carefully and transferred to the 6-well plate containing 1.0 mL of warm Assay Medium and were incubated for 120 ± 15 minutes at 37 °C.
Cell Viability Measurement
After incubation, cell culture inserts were dried carefully to remove excess medium. The cell culture inserts were transferred into a 24-wells plate prefilled with 0.3 mL MTT-medium (1.0 mg/mL). The tissues were incubated for 180 ± 10 minutes at 37 °C.
After incubation with MTT-medium the tissues were placed on blotting paper to dry the tissues and then transferred to a pre-labelled 24-well plate containing 2.0 mL of isopropanol in each designated well so that isopropanol is flowing into the insert on the tissue surface.
Formazan was extracted with 2 mL of isopropanol and refrigerated for 18 ± 2 hours in the dark. At the end of the extraction period, the liquid within each insert was decanted/pipetted into the well from which it was taken.
The amount of extracted formazan was determined spectrophotometrically at 570 nm in duplicate with the TECAN Infinite® M200 Pro Plate Reader.
Cell viability was calculated for each tissue as a percentage of the mean of the negative control tissues. Eye hazard potential of the test item was classified according to remaining cell viability following exposure of the test item. - Irritation parameter:
- other: Optical Density
- Run / experiment:
- Mean-Test Item
- Value:
- 1.199
- Vehicle controls validity:
- not examined
- Negative controls validity:
- valid
- Positive controls validity:
- valid
- Irritation parameter:
- other: Tissue Viability
- Run / experiment:
- mean - Test Item
- Value:
- 127
- Vehicle controls validity:
- not examined
- Negative controls validity:
- valid
- Positive controls validity:
- valid
- Other effects / acceptance of results:
- Interference of the Test Item with the MTT Endpoint
The test item was checked for possible direct MTT reduction and color interference in the Skin irritation test using EpiSkinTM as a skin model (Test Facility Study No. 20285127).
Because the solutions did not turn blue / purple nor a blue / purple precipitate was observed and the OD for the test item solution was ≤0.08, it was concluded that the test item did not interfere with the MTT endpoint.
Main Assay
Eye hazard potential is expressed as the remaining cell viability after exposure to the test item. The relative mean tissue viability obtained after 30 ± 2 minutes treatment with the test item compared to the negative control tissues was 127%. Since the mean relative tissue viability for the test item was above 60% the test item is considered to be non-irritant.
The positive control had a mean cell viability after 30 ± 2 minutes exposure of 44%. The difference between the percentage of viability of two negative control tissues was ≤ 40%, which is above the maximum of 20%. The individual values of the negative control tissues (viabilities of 120% and 80%) were in the same category and were well above 60%. The absolute mean OD570 (optical density at 570 nm) of the negative control tissues was within the acceptance limits of OECD 492 (lower acceptance limit ≥0.8 and upper acceptance limit ≤2.5), therefore this does not affect the study integrity. The difference between the percentage of viability of two tissues treated identically with the test item was ≤ 14%, indicating that the test system functioned properly. - Interpretation of results:
- GHS criteria not met
- Conclusions:
- In conclusion, Decanoic acid, mixed esters with dipentaerythritol, octanoic acid and valeric acid is non-irritant in the EpiOcular™ test under the experimental conditions described in this report.
- Executive summary:
The objective of this study was to evaluate the eye hazard potential of Decanoic acid, mixed esters with dipentaerythritol, octanoic acid and valeric acid. For this purpose Decanoic acid, mixed esters with dipentaerythritol, octanoic acid and valeric acid was topically applied on the Reconstructed Human EpiOcular™ Model.
The possible eye hazard potential of the test item was tested through topical application for 30 minutes.
The study procedures described in this report were based on the most recent OECD guideline.
Batch 2019194336 of the test item was a clear light yellow liquid. The test item was applied undiluted (50 μL) directly on top of the tissue for 30 ± 2 minutes.
After exposure the cornea epithelial construct was thoroughly rinsed to remove the test item and transferred to fresh medium for an immersion incubation. Afterwards, the tissues were transferred to fresh medium and incubated for 2 hours at standard culture conditions, prior to determination of the cytotoxic (irritancy) effect.
The positive control had a mean cell viability of 44% after 30 ± 2 minutes exposure. The absolute mean OD570 (optical density at 570 nm) of the negative control tissues was within the acceptance limits of OECD 492 (lower acceptance limit ≥0.8 and upper acceptance limit < 2.5). The difference between the percentage of viability of two tissues treated with test item was ≤14%, indicating that the test system functioned properly.
Eye hazard potential is expressed as the remaining cell viability after exposure to the test item. The relative mean tissue viability obtained after 30 ± 2 minutes treatment with the test item compared to the negative control tissues was 127%. Since the mean relative tissue viability for the test item was above 60% after 30 ± 2 minutes treatment the test item is considered to be non-irritant.
In conclusion, Decanoic acid, mixed esters with dipentaerythritol, octanoic acid and valeric acid is non-irritant in the EpiOcular™ test under the experimental conditions described in this report.
Reference
Mean Adsorption in the EpiOcular™ Test with Decanoic acid, mixed esters with dipentaerythritol, octanoic acid and valeric acid
|
A (OD570) |
B (OD570) |
Mean (OD570) |
|
SD |
Negative control |
1.132 |
0.753 |
0.942 |
± |
0.268 |
Test item |
1.132 |
1.267 |
1.199 |
± |
0.096 |
Positive control |
0.414 |
0.418 |
0.416 |
± |
0.003 |
OD = optical density
SD = Standard deviation
Duplicate exposures are indicated by A and B.
In this table the values are corrected for background adsorption (0.0424), Isopropanol was used to measure the background adsorption.
Mean Tissue Viability in the EpiOcular™ Test with Decanoic acid, mixed esters with dipentaerythritol, octanoic acid and valeric acid
|
Mean tissue viability (percentage of control) |
Difference between two tissues (percentage) |
Negative control |
100 |
40 |
Test item |
127 |
14 |
Positive control |
44 |
0.5 |
Individual OD Measurements at 570 nm
|
A (OD570) |
B (OD570) |
Negative control OD570 measurement 1 OD570 measurement 2 |
1.1713 1.1771 |
0.7982 0.7924 |
Test item OD570 measurement 1 OD570 measurement 2 |
1.1757 1.1729 |
1.3128 1.3063 |
Positive control OD570 measurement 1 OD570 measurement 2 |
0.4559 0.4561 |
0.4623 0.4591 |
OD = optical density
Duplicate exposures are indicated by A and B
Historical Control Data for EpiOcular™ Studies
|
Negative control (adsorption; OD570) |
Positive control (adsorption; OD570) |
Positive control (viability; %) |
Range |
1.077 – 2.070 |
0.029 – 0.823 |
2.11 – 45.20 |
Mean |
1.731 |
0.416 |
23.88 |
SD |
0.225 |
0.209 |
11.49 |
n |
54 |
54 |
54 |
SD = Standard deviation
n = Number of observations
The above mention historical control data range of the controls were obtained by collecting all data over the period of December 2016 to November 2020.
Endpoint conclusion
- Endpoint conclusion:
- no adverse effect observed (not irritating)
Respiratory irritation
Endpoint conclusion
- Endpoint conclusion:
- no study available
Additional information
Skin irritation - in vitro
The objective of this study was to evaluate Decanoic acid, mixed esters with dipentaerythritol, octanoic acid and valeric acid for its ability to induce skin irritation on a human three-dimensional epidermal model (EPISKIN Small model (EPISKIN-SMTM)). The possible skin irritation potential of the test item was tested through topical application for 15 minutes.
The test item was applied undiluted (25 μL), directly on top of the skin tissue for 15 ± 0.5 minutes. After a 42 ± 1 hour post-incubation period, determination of the cytotoxic (irritancy) effect was performed.
The relative mean tissue viability obtained after 15 ± 0.5 minutes treatment with the test item compared to the negative control (phosphate buffered saline) tissues was 101%. Since the mean relative tissue viability for the test item was above 50% after 15 ± 0.5 minutes treatment the test item is considered to be non-irritant.
Eye irritation-in vitro
Decanoic acid, mixed esters with dipentaerythritol, octanoic acid and valeric acid was topically applied on the Reconstructed Human EpiOcular™ Model.
The possible eye hazard potential of the test item was tested through topical application for 30 minutes.The test item was applied undiluted (50 μL) directly on top of the tissue for 30 ± 2 minutes.
After exposure the cornea epithelial construct was thoroughly rinsed to remove the test item and transferred to fresh medium for an immersion incubation. Afterwards, the tissues were transferred to fresh medium and incubated for 2 hours at standard culture conditions, prior to determination of the cytotoxic (irritancy) effect.
Eye hazard potential is expressed as the remaining cell viability after exposure to the test item. The relative mean tissue viability obtained after 30 ± 2 minutes treatment with the test item compared to the negative control tissues was 127%. Since the mean relative tissue viability for the test item was above 60% after 30 ± 2 minutes treatment the test item is considered to be non-irritant.
Justification for classification or non-classification
Skin irritation
Decanoic acid, mixed esters with dipentaerythritol, octanoic acid and valeric acid is non-irritant in the in vitro skin irritation test and should not be classified according to the Globally Harmonized System of Classification and Labelling of Chemicals (GHS) of the United Nations.
Eye irritation
Decanoic acid, mixed esters with dipentaerythritol, octanoic acid and valeric acid is non-irritant in the in vitro eye irritation test and should not be classified according to the Globally Harmonized System of Classification and Labelling of Chemicals (GHS) of the United Nations.
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