3-{2-[2-(3-azaniumylpropoxy)ethoxy]ethoxy}propan-1-aminium di[(2Z)-3-carboxyprop-2-enoate]

Endpoint summary

Description of key information

Skin irritation

Skin irritation, Key Study, in-vitro, Charles River (2018); OECD 439

The test item is considered to be non-irritant.

Eye irritation

Eye irritation, Key Study, in-vitro, Charles River (2018): OECD 437

Bis-Aminopropyl Diglycol Dimaleate induced ocular irritation through one endpoint (permeability), resulting in a mean in vitro irritancy score of 4.8 after 10 minutes of treatment. In conclusion, since Bis-Aminopropyl Diglycol Dimaleate induced an IVIS > 3 ≤ 55, no prediction on the classification can be made.

Eye irritation, Key Study, in-vitro, Charles River (2018); OECD 492

Bis-Aminopropyl Diglycol Dimaleate, the test substance, was found to be non-irritant in the EpiOcular™ test under the experimental conditions described in this report (OECD 492).

Key value for chemical safety assessment

Skin irritation / corrosion

Link to relevant study records

Reference

Endpoint:

skin irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

02 November 2017 to 27 November 2017

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)

GLP compliance:

yes

Specific details on test material used for the study:

Identification: Bis-Aminopropyl Diglycol Dimaleate
Appearance: Clear to transparent yellow liquid
Test item storage: At room temperature
Purity/Composition correction factor: Contains 74% water
Stability at higher temperatures Yes, maximum temperature: 40°C, maximum duration: 60 minutes
Chemical name (IUPAC), synonym or trade name: Bis-Aminopropyl Diglycol Dimaleate
CAS Number: 1629579-82-3

Test system:

human skin model

Source species:

human

Cell type:

non-transformed keratinocytes

Cell source:

other: SkinEthic Laboratories

Vehicle:

unchanged (no vehicle)

Control samples:

not required

Amount/concentration applied:

The liquid test item was applied undiluted (25 µl) directly on top of the tissue.

Duration of treatment / exposure:

15 mins

Number of replicates:

3

Irritation / corrosion parameter:

% tissue viability

Value:

> 50

Vehicle controls validity:

valid

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

no indication of irritation

Interpretation of results:

GHS criteria not met

Remarks:

In conclusion, Bis-Aminopropyl Diglycol Dimaleate is non-irritant in the in vitro skin irritation test under the experimental conditions described in this report and should not be classified.

Conclusions:

Bis-Aminopropyl Diglycol Dimaleate was checked for color interference in aqueous conditions and possible direct MTT reduction by adding the test item to MTT medium. Because no color changes were observed 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 98%. 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 16%. The absolute mean OD570of 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 ≤ 8%, indicating that the test system functioned properly.

The mean relative tissue viability for the test item was above 50% the test item is considered to be non-irritant.

Executive summary:

The objective of this study was to evaluate Bis-Aminopropyl Diglycol Dimaleate 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 11_13_17_1 of the test item was a clear to transparent 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-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 tissues was 98%. 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 had a mean cell viability of 16% 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 ≤ 8%, indicating that the test system functioned properly.

 

In conclusion, Bis-Aminopropyl Diglycol Dimaleate 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.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Eye irritation

Link to relevant study records

Reference

Reference 1

Endpoint:

eye irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

23 October 2017 to 01 February 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 437 (Bovine Corneal Opacity and Permeability Test Method for Identifying i) Chemicals Inducing Serious Eye Damage and ii) Chemicals Not Requiring Classification for Eye Irritation or Serious Eye Damage)

Deviations:

no

GLP compliance:

yes

Specific details on test material used for the study:

Identification: Bis-Aminopropyl Diglycol Dimaleate
Appearance: Clear colourless to pale yellow liquid (determined by Charles River Den Bosch)
Purity/Composition: Not indicated
Test item storage: At room temperature
Stable under storage conditions until: 31 November 2019 (expiry date)

Species:

cattle

Details on test animals or tissues and environmental conditions:

- Test System: Bovine eyes were used as soon as possible after slaughter.
- Rationale: In the interest of sound science and animal welfare, a sequential testing strategy is recommended to minimize the need of in vivo testing (1-6). As a consequence a validated and accepted in vitro test for eye irritation should be performed before in vivo tests are conducted. One of the proposed validated in vitro eye irritation tests is the Bovine Corneal Opacity and Permeability (BCOP) test.
- Source: Bovine eyes from young cattle were obtained from the slaughterhouse (Vitelco, 's Hertogenbosch, The Netherlands), where the eyes were excised by a slaughterhouse employee as soon as possible after slaughter.
- Transport: Eyes were collected and transported in physiological saline in a suitable container under cooled conditions.

Vehicle:

unchanged (no vehicle)

Controls:

yes

Amount / concentration applied:

750 µl

Duration of treatment / exposure:

Corneas were incubated in a horizontal position for 10 ± 1 minutes

Duration of post- treatment incubation (in vitro):

120 ± 10 minutes

Number of animals or in vitro replicates:

3

Details on study design:

Preparation of Corneas
The eyes were checked for unacceptable defects, such as opacity, scratches, pigmentation and neovascularization by removing them from the physiological saline and holding them in the light. Those exhibiting defects were discarded. The isolated corneas were stored in a petri dish with cMEM (Earle’s Minimum Essential Medium (Life Technologies, Bleiswijk, The Netherlands) containing 1% (v/v) L-glutamine (Life Technologies) and 1% (v/v) Foetal Bovine Serum (Life Technologies)). The isolated corneas were mounted in a corneal holder (one cornea per holder) of BASF (Ludwigshafen, Germany) with the endothelial side against the O-ring of the posterior half of the holder. The anterior half of the holder was positioned on top of the cornea and tightened with screws. The compartments of the corneal holder were filled with cMEM of 32 ± 1 °C. The corneas were incubated for the minimum of 1 hour at 32 ± 1 °C.

Cornea Selection and Opacity Reading
After the incubation period, the medium was removed from both compartments and replaced with fresh cMEM. Opacity determinations were performed on each of the corneas using an opacitometer (BASF-OP3.0, BASF, Ludwigshafen, Germany). The opacity of each cornea was read against a cMEM filled chamber, and the initial opacity reading thus determined was recorded. Corneas that had an initial opacity reading higher than 7 were not used. Three corneas were selected at random for each treatment group.

Test Item Preparation
No correction was made for the purity/composition of the test item. The test item was tested neat.

Treatment of Corneas and Opacity Measurements
The medium from the anterior compartment was removed and 750 µl of either the negative control, positive control (Ethanol) or test item was introduced onto the epithelium of the cornea. The holders were slightly rotated, with the corneas maintained in a horizontal position, to ensure uniform distribution of the control or the test item over the entire cornea. Corneas were incubated in a horizontal position for 10 ± 1 minutes at 32 ± 1 °C. After the incubation the solutions were removed and the epithelium was washed with MEM with phenol red (Earle’s Minimum Essential Medium, Life Technologies) and thereafter with cMEM. Possible pH effects of the test item on the corneas were recorded. The medium in the posterior compartment was removed and both compartments were refilled with fresh cMEM. Subsequently the corneas were incubated for 120 ± 10 minutes at 32 ± 1 °C. After the completion of the incubation period opacity determination was performed. Each cornea was inspected visually for dissimilar opacity patterns. Initially an experiment was performed in which the acceptability criteria were not met. The experiment was rejected and a repeat experiment was performed.

Opacity Measurement
The opacity of a cornea was measured by the diminution of light passing through the cornea. The light was measured as illuminance (I = luminous flux per area, unit: lux) by a light meter.
The opacity value (measured with the device OP-KIT) was calculated according to:

𝑂𝑝𝑎𝑐𝑖𝑡𝑦 = 𝐼0 / 𝐼 − 0.9894 / 0.0251

With I0 the empirically determined illuminance through a cornea holder but with windows and medium, and I the measured illuminance through a holder with cornea. The change in opacity for each individual cornea (including the negative control) was calculated by subtracting the initial opacity reading from the final post-treatment reading. The corrected opacity for each treated cornea with the test item or positive control was calculated by subtracting the average change in opacity of the negative control corneas from the change in opacity of each test item or positive control treated cornea. The mean opacity value of each treatment group was calculated by averaging the corrected opacity values of the treated corneas for each treatment group.

Application of Sodium Fluorescein
Following the final opacity measurement, permeability of the cornea to Na-fluorescein (Sigma-Aldrich, Germany) was evaluated. The medium of both compartments (anterior compartment first) was removed. The posterior compartment was refilled with fresh cMEM. The anterior compartment was filled with 1 ml of 4 mg Na-fluorescein (Sigma-Aldrich Chemie GmbH, Germany)/ml cMEM solution. The holders were slightly rotated, with the corneas maintained in a horizontal position, to ensure uniform distribution of the sodium-fluorescein solution over the entire cornea. Corneas were incubated in a horizontal position for 90 ± 5 minutes at 32 ± 1 °C.

Permeability Determinations
After the incubation period, the medium in the posterior compartment of each holder was removed and placed into a sampling tube labelled according to holder number. 360 µl of the medium from each sampling tube was transferred to a 96-well plate. The optical density at 490 nm (OD490) of each sampling tube was measured in triplicate using a microplate reader (TECAN Infinite® M200 Pro Plate Reader). Any OD490 that was 1.500 or higher was diluted to bring the OD490 into the acceptable range (linearity up to OD490 of 1.500 was verified before the start of the experiment). OD490 values of less than 1.500 were used in the permeability calculation. The mean OD490 for each treatment was calculated using cMEM corrected OD490 values. If a dilution has been performed, the OD490 of each reading of the positive control and the test item was corrected for the mean negative control OD490 before the dilution factor was applied to the reading.

Irritation parameter:

in vitro irritation score

Value:

4.8

Vehicle controls validity:

valid

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

no indication of irritation

The corneas treated with Bis-Aminopropyl Diglycol Dimaleate showed opacity values ranging from 1.6 to 4.1 and permeability values ranging from 0.129 to 0.140.

The corneas were translucent after the 10 minutes of treatment with Bis-Aminopropyl Diglycol Dimaleate.

A pH effect of the test item was observed on the rinsing medium, the corneas were rinsed until no color change of the medium was observed. Hence, the in vitro irritancy scores ranged from 3.7 to 6.2 after 10 minutes of treatment with Bis-Aminopropyl Diglycol Dimaleate.

Interpretation of results:

GHS criteria not met

Remarks:

no prediction on the classification can be made.

Conclusions:

Bis-Aminopropyl Diglycol Dimaleate induced ocular irritation through one endpoint (permeability), resulting in a mean in vitro irritancy score of 4.8 after 10 minutes of treatment.
In conclusion, since Bis-Aminopropyl Diglycol Dimaleate induced an IVIS > 3 ≤ 55, no prediction on the classification can be made.

Executive summary:

The objective of this study was to evaluate the eye hazard potential of Bis-Aminopropyl Diglycol Dimaleate as measured by its ability to induce opacity and increase permeability in  an isolated bovine cornea using the Bovine Corneal Opacity and Permeability test (BCOP test).

This report describes the potency of chemicals to induce serious eye damage using isolated bovine corneas. The eye damage of Bis-Aminopropyl Diglycol Dimaleate was tested through topical application for 10 minutes. The study procedures described in this report were based on the most recent OECD guideline. Batch 11_13_17_1 of Bis-Aminopropyl Diglycol Dimaleate was a clear colourless to pale yellow liquid liquid.

The test item was applied as it is (750 µl) directly on top of the corneas. The negative control responses for opacity and permeability were less than the upper limits of the laboratory historical range indicating that the negative control did not induce irritancy on the corneas. The mean in vitro irritancy score of the positive control (Ethanol) was 51 and was within two standard deviations of the current historical positive control mean. It was

therefore concluded that the test conditions were adequate and that the test system functioned properly.

Bis-Aminopropyl Diglycol Dimaleate induced ocular irritation through one endpoint (permeability), resulting in a mean in vitro irritancy score of 4.8 after 10 minutes of treatment. In conclusion, since Bis-Aminopropyl Diglycol Dimaleate induced an IVIS > 3 ≤ 55, no prediction on the classification can be made.

Reference 2

Endpoint:

eye irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

17 January 2018 to 16 Mar 2018

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:

Adopted 28 July 2015

GLP compliance:

yes (incl. QA statement)

Specific details on test material used for the study:

Identification: Bis-Aminopropyl Diglycol Dimaleate
Appearance: Clear to transparent yellow liquid
Purity/Composition: Not indicated
Test item storage: At room temperature
Stable under storage conditions until: 13 November 2019 (expiry date)

Additional information
Test Facility test item number: 207396/C
Purity/Composition correction factor: Contains 74% water
Test item handling: No specific handling conditions required
Stability at higher temperatures: Yes, maximum temperature: 40°C, maximum duration: 60 minutes
Chemical name (IUPAC, synonym or trade name: Bis-Aminopropyl Diglycol Dimaleate
CAS number: 11629579-82-3
Molecular formula: C18H32N2O11
Molecular weight: 452.46

Species:

human

Vehicle:

unchanged (no vehicle)

Controls:

yes, concurrent positive control

yes, concurrent negative control

Amount / concentration applied:

The liquid test item was applied undiluted (50 µL) directly on top of the tissue.
Two tissues were treated with 50 µL Milli-Q water (negative control) and 2 tissues with 50 µL Methyl Acetate (positive control) respectively.

Duration of treatment / exposure:

30 minutes ± 2 minutes at 37.0 ± 1.0 °C

Duration of post- treatment incubation (in vitro):

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 pre-labeled 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.

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:

Test System
EpiOcular™ (OCL-200-EIT MatTek Corporation, Lot: 27420, kit A and B, Appendix 4).
The EpiOcular tissue construct is a non-keratinized epithelium (0.6 cm^2) 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.
Rationale
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 eye irritation tests is the EpiOcular test, which is recommended in international guidelines and scientific publications (e.g. OECD).

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
Bis-Aminopropyl Diglycol Dimaleate 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 Bis-Aminopropyl Diglycol Dimaleate 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 Bis-Aminopropyl Diglycol Dimaleate 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 absorbance of the solutions was determined spectrophotometrically at 570 nm in duplicate with the TECAN Infinite® M200 Pro Plate Reader. Centrifugation was not considered necessary. 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
Bis-Aminopropyl Diglycol Dimaleate 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 Bis-Aminopropyl Diglycol Dimaleate 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. Only test items which bind to the tissue after rinsing can interact with MTT in the main assay.

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.
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.

Environmental conditions
All incubations, were carried out in a controlled environment, in which optimal conditions were a humid atmosphere of 80 to 100% (actual range 78 to 86%), containing 5.0 ± 0.5% CO2 in air in the dark at 37.0 ± 1.0 °C (actual range 36.8 to 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 (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-DPBS. The tissues were incubated at standard culture conditions for 30 ± 2 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 Bis-Aminopropyl Diglycol Dimaleate (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 pre-labeled 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 isopropanol 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.

ACCEPTABILITY CRITERIA
The in vitro eye irritation test is considered acceptable if it meets the following criteria:
a) The absolute mean OD570 of the two tissues of the negative control should reasonably be > 0.8 and < 2.5.
b) The mean relative tissue viability of the positive control should be <50% relative to the negative control.
c) The difference between the % tissue viabilities of the two identically treated replicates should be <20.
All results presented in the tables of the report are calculated using values as per the raw data rounding procedure and may not be exactly reproduced from the individual data presented.

INTERPRETATION
The test chemical is identified as not requiring classification and labelling according to UN GHS (No Category) if the mean percent tissue viability after exposure and post-exposure incubation is more than (>) 60%. In this case no further testing in other test methods is required.
The test chemical is identified as potentially requiring classification and labelling according to UN GHS (Category 2 or Category 1) if the mean percent tissue viability after exposure and postexposure incubation is less than or equal (≤) to 60%.

ANALYSIS
Calculation of Cell Viability
Optical Density readings were transferred into Microsoft Excel to allow further calculations to be performed.
The corrected OD (ODc) for each sample or control was calculated by subtracting the value of the blank mean (ODbl) from each reading (ODraw).

ODc = ODraw – ODbl

The OD value representing 100% cell viability is the average OD of the negative controls (ODlt_u+MTT).
The %Viability for each sample and positive control is calculated as follows:
%Viability = (ODc/mean ODlt_u+MTT) * 100

Irritation parameter:

other: Optical density score

Run / experiment:

OD570

Value:

ca. 1.308

Vehicle controls validity:

not applicable

Negative controls validity:

valid

Positive controls validity:

valid

Other effects / acceptance of results:

RESULTS

Interference of the Test Item with the MTT Endpoint
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 -0.0012 and 0.0005, 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 Bis-Aminopropyl Diglycol Dimaleate did not interact with the MTT endpoint.

Main Assay
The mean absorption at 570 nm measured after treatment with the test item and controls are presented in "Any other information" section.
The individual OD570 measurements are presented in "Any other information" section.
The mean tissue viability obtained ("Any other information" section) after 30 ± 2 minutes treatment with the test item compared to the negative control tissues. 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 the test item compared to the negative control tissues was 81%. Since the mean relative tissue viability for the test item was above 60% Bis-Aminopropyl Diglycol Dimaleate is considered to be non-irritant.
The positive control had a mean cell viability after 30 ± 2 minutes exposure of 33%. The absolute mean OD570 of the negative control tissues was within the laboratory historical control data range ("Any other information" section). The difference between the percentages of viability of two tissues treated identically was less than 8%, indicating that the test system functioned properly.

Table1          
Mean Absorption in the EpiOcular™ Test with Bis-Aminopropyl Diglycol Dimaleate

	A (OD570)	B (OD570)	Mean (OD570)		SD
Negative control	1.674	1.552	1.613	±	0.086
Bis-Aminopropyl Diglycol Dimaleate	1.285	1.331	1.308	±	0.033
Positive control	0.594	0.483	0.539	±	0.078

OD = optical density

SD = Standard deviation

Duplicate exposures are indicated by A and B.

In this table the values are corrected for background absorption (0.041). Isopropanol was used to measure the background absorption.

 

Table2          
Mean Tissue Viability in the EpiOcular™ Test with Bis-Aminopropyl Diglycol Dimaleate

	Mean tissue viability (percentage of control)	Difference between two tissues  (percentage)
Negative control	100	7.6
Bis-Aminopropyl Diglycol Dimaleate	81	2.9
Positive control	33	0.5

  Individual OD Measurements at 570 Nm

	A (OD570)	B (OD570)
Negative control
OD570 measurement 1	1.6411	1.5925
OD570 measurement 2	1.7893	1.5936
Bis-Aminopropyl Diglycol Dimaleate
OD570 measurement 1	1.2703	1.3803
OD570 measurement 2	1.3820	1.3645
Positive control
OD570 measurement 1	0.6109	0.5155
OD570 measurement 2	0.6595	0.5338

OD = Optical density

Duplicate exposures are indicated by A and B.

 

Historical Control Data for EpiOcular™ Studies

Liquids

	Negative control (absorption; OD570)	Positive control (absorption; OD570)	Positive control (viability; %)
Range	1.077 – 1.805	0.029 – 0.793	2.11 – 48.25
Mean	1.52	0.42	26.86
SD	0.21	0.23	14.11
n	16	16	16

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 January 2013 to May 2017.

Interpretation of results:

GHS criteria not met

Remarks:

non-irritant

Conclusions:

Bis-Aminopropyl Diglycol Dimaleate, the test substance, was found to be non-irritant in the EpiOcular™ test under the experimental conditions described in this report (OECD 492).

Executive summary:

The objective of this study was to evaluate the eye hazard potential of Bis-Aminopropyl Diglycol Dimaleate. For this purpose Bis-Aminopropyl Diglycol Dimaleate was topically applied on the Reconstructed Human EpiOcular™ Model.

The possible eye hazard potential of Bis-Aminopropyl Diglycol Dimaleate was tested through topical application for 30 minutes.

The study procedures described in this report were based on the most recent OECD guideline.

The test item was a clear to transparent 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 33% after 30 ± 2 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 difference between the percentages of viability of two tissues treated identically was less than 8%, 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 81%. 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, Bis-Aminopropyl Diglycol Dimaleate is non-irritant in the EpiOcular™ test under the experimental conditions described in this report.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Respiratory irritation

Endpoint conclusion

Endpoint conclusion:

no study available