2,2'-(vinylenedi-p-phenylene)bisbenzoxazole

Endpoint summary

Description of key information

Skin Irritation:

The overall irritation score of the substance was determined to be 0 and no erythema and edema (skin irritation) were found at the end of 14 days observation period after patch removal.

Hence, it was concluded that the test chemical was Non-Irritating to the skin of Sprague Dawley rats under the experimental conditions tested and classified as “Category- Not Classified” as per CLP Classification.

Eye Irritation:

The mean % tissue viability of test chemical was determined to be 95.1%. Hence, under the experimental test conditions it was concluded that test chemical was considered to be not irritating to the MatTek EpiOcular Tissue Model OCL-200 and being classified as “Not classified’’.

Key value for chemical safety assessment

Skin irritation / corrosion

Link to relevant study records

Reference

Endpoint:

skin irritation: in vivo

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Justification for type of information:

Data is from experimental study report.

Qualifier:

according to guideline

Guideline:

other: OECD Guideline 402 (Acute Dermal Toxicity)

Principles of method if other than guideline:

To determine the dermal reaction profile of the test chemical in Sprague Dawley rats.

GLP compliance:

yes

Specific details on test material used for the study:

- Name of test material: 2,2'-(ethene-1,2-diyldi-4,1-phenylene)bis(1,3-benzoxazole)
- Molecular formula: C28H18N2O2
- Molecular weight: 414.462 g/mol
- Smiles notation: n1c2ccccc2oc1c1ccc(\C=C\c2ccc(c3oc4ccccc4n3)cc2)cc1
- InChl: 1S/C28H18N2O2/c1-3-7-25-23(5-1)29-27(31-25)21-15-11-19(12-16-21)9-10-20-13-17-22(18-14-20)28-30-24-6-2-4-8-26(24)32-28/h1-18H/b10-9+
- Substance type: Organic
- Physical state: Solid

SOURCE OF TEST MATERIAL
- Test Item: 2,2’-(vinylenedi-p-phenylene)bisbenzoxazole (CAS No. 1533-45-5)
- Source of test material: Sustainability Support Services (Europe) AB
- Batch No.of test material: OBA201405A
- Manufacturing Date: October 2016
- Expiration date of the lot/batch: October 2019
- Purity test date: No data available
- Consistency: Solid, crystalline powder

RADIOLABELLING INFORMATION (Not applicable)
- Radiochemical purity: N/A
- Specific activity: N/A
- Locations of the label: N/A
- Expiration date of radiochemical substance: N/A

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: Ambient Temperature
- Stability under test conditions: No data available
- Solubility and stability of the test substance in the solvent/vehicle: No data available
- Reactivity of the test substance with the solvent/vehicle of the cell culture medium: No data available

TREATMENT OF TEST MATERIAL PRIOR TO TESTING
- Treatment of test material prior to testing: Test item was grounded to fine powder prior to application. The particulates were moistened with distilled water before application.
- Preliminary purification step (if any):No data available
- Final dilution of a dissolved solid, stock liquid or gel: No data available
- Final preparation of a solid: No data available

FORM AS APPLIED IN THE TEST: Paste

OTHER SPECIFICS:
Safety Precautions : Safety precautions included use of protective clothing, gloves, masks and eye protection (glasses).

Species:

rat

Strain:

Sprague-Dawley

Details on test animals or test system and environmental conditions:

TEST ANIMALS
- Source: National Institute of Biosciences, Pune.
- Females nulliparous and non-pregnant: No data available
- Age at study initiation: Young adult male and female rats aged between 8 – 12 weeks were used.
- Weight at study initiation: The weight range of approximately 223.3 to 258.7 grams at initiation of dosing.
Body weights at the start :
Male
Mean : 256.06 g (= 100 %)
Minimum : 252.7 g (- 1.31 %)
Maximum : 258.7 g (+ 1.03 %)
Total No. of animals : 5
Female
Mean : 227.60 g (= 100 %)
Minimum : 223.3 g (- 1.89 %)
Maximum : 231.4 g (+ 1.67 %)
Total No. of animals : 5
- Identification: Each rat was individually identified by the cage number.
- Fasting period before study: No data available
- Housing: The rats were individually housed in polycarbonate cages with paddy husk as bedding.
- Diet (e.g. ad libitum): Rodent feed supplied by the Nutrivet Life Sciences, Pune, was provided ad libitum from individual feeders.
- Water (e.g. ad libitum): Water was provided ad libitum from individual bottles attached to the cages. All water was from a local source and passed through the reverse osmosis membrane before use.
- Acclimation period: 5 days.

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 20.1 to 22.5 degree centigrade.
- Humidity (%): 56.3% to 58.8%
- Air changes (per hr): Ten to fifteen air changes per hour.
- Photoperiod (hrs dark / hrs light): An artificial light and dark cycle of 12 hours each was provided to the room.

IN-LIFE DATES: 08-06-2017 to 23-06-2017

Type of coverage:

semiocclusive

Preparation of test site:

clipped

Vehicle:

water

Remarks:

(Distilled water)

Controls:

not specified

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 2000 mg/kg bw
- Concentration (if solution): No data available

VEHICLE
- Amount(s) applied (volume or weight with unit): No data available
- Concentration (if solution): No data available
- Lot/batch no. (if required): No data available
- Purity: No data available

NEGATIVE CONTROL
- Amount(s) applied (volume or weight): No data available
- Concentration (if solution): No data available

POSITIVE CONTROL
- Amount(s) applied (volume or weight): No data available
- Concentration (if solution): No data available

Duration of treatment / exposure:

24 hours

Observation period:

14 days

Number of animals:

10 (5/sex)

Details on study design:

TEST SITE
- Area of exposure: Trunk (dorsal surface and sides from scapular to pelvic area)
- % coverage: Approximately 10% of the body surface area.
- Type of wrap if used: Porous gauze dressing and non-irritating tape.

REMOVAL OF TEST SUBSTANCE
- Washing (if done): Distilled water was used to remove residual test item.

OBSERVATION TIME POINTS
(indicate if minutes, hours or days) : Dermal reaction was observed daily for study period of 14 days.

SCORING SYSTEM: Draize Method.

OTHER OBSERVATIONS
Type and Frequency of Tests, Analyses and Measurements

Viability: Twice daily.

Clinical Observations and General Appearance:
Animals were observed for clinical signs, mortality, until sacrifice.
Onset, duration and severity of any sign were recorded. The clinical signs and mortality observations were conducted at 10, 30, 60 minutes, 2, 4 and 6 hours on the day of dosing and once daily thereafter for 14 day. Daily observation was done as far as possible at the same time.

The observations were included general clinical signs, observations of eyes, mucous membranes, respiratory, circulatory system and behavior pattern.

Body weights:
Individual animal body weights were recorded pre-test (prior to administration of the test item), day 7 and at termination on day 14.

Gross Pathology:
Necropsy was performed on animals surviving at the end of the study. Macroscopic examination of all the orifices, cavities and tissues were made and the findings were recorded. All animals surviving the study period were sacrificed by the carbon dioxide asphyxiation technique (day 15).

Histopathology:
No gross abnormalities were observed in animals sacrificed terminally hence, no histopathology was performed.

Irritation parameter:

erythema score

Basis:

mean

Time point:

14 d

Score:

0

Max. score:

4

Reversibility:

not specified

Remarks on result:

no indication of irritation

Irritation parameter:

edema score

Basis:

mean

Time point:

14 d

Score:

0

Max. score:

4

Reversibility:

not specified

Remarks on result:

no indication of irritation

Irritant / corrosive response data:

Overall result:
Sex : Male
Group I -
Animal treated at the dose level of 2000 mg/kg body weight did not result in any skin reaction during the study period of 14 days.

Sex : Female
Group I -
Animal treated at the dose level of 2000 mg/kg body weight did not result in any skin reaction during the study period of 14 days.

Other effects:

Other effects:
Clinical Signs of Toxicity and Mortality
Sex : Male
Group I -
Animal treated at the dose level of 2000 mg/kg body weight did not result in any signs of toxicity during the study period of 14 days. All animals survived through the study period of 14 days.

Sex : Female
Group I -
Animal treated at the dose level of 2000 mg/kg body weight did not result in any signs of toxicity during the study period of 14 days. All animals survived through the study period of 14 days.

Body Weight
Sex : Male
Group I (2000 mg/kg) - Percent body weight gain after 7 days and 14 days was found to be 10.03% and 18.99% respectively.

Sex : Female
Group I (2000 mg/kg) - Percent body weight gain after 7 days and 14 days was found to be 6.51% and 11.11% respectively.

Gross Pathological Findings
Gross pathological examination did not reveal any abnormalities in animals from 2000 mg/kg dose group.

Individual Animal - Evaluation of Dermal Reaction

Test System : Sprague Dawley Rat

Sex : Male  

Group : I

Dose  : 2000 mg/kg body weight

Animal	Dermal	D A Y S
No.	Reaction	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14
1	Erythema	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
2	Erythema	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
3	Erythema	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
4	Erythema	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
5	Erythema	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

 

 Sex : Female  

Group : I

Dose  : 2000 mg/kg body weight

Animal	Dermal	D A Y S
No.	Reaction	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14
6	Erythema	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
7	Erythema	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
8	Erythema	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
9	Erythema	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
10	Erythema	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
	Oedema	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

 

Table No. I

Summary of Clinical Signs of Toxicity and Mortality

Test System : Sprague Dawley Rat

Sex : Male

Group  No.	Dose mg/kg	Observed Signs	Total Number of Animals	Animal Nos.	Period of signs in days  From - to	Mortality
I	2000	No clinical signs observed	5	1 - 5	Day 0 - Day 14	0/5

 

Sex : Female

Group  No.	Dose mg/kg	Observed Signs	Total Number of Animals	Animal Nos.	Period of signs in days  From - to	Mortality
I	2000	No clinical signs observed	5	6 - 10	Day 0 - Day 14	0/5

 

Table No. II

Summary of Evaluation of Dermal Reaction

Test System : Sprague Dawley Rat

Sex : Male 

Group  No.	Dose mg/kg	Dermal Reaction	Total Number of Animals	Animal Nos.	Period of signs in days  From - to	Mortality
I	2000	No dermal reaction observed	5	1 - 5	Day 0 - Day 14	0/5

 

Sex : Female

Group  No.	Dose mg/kg	Dermal Reaction	Total Number of Animals	Animal Nos.	Period of signs in days  From - to	Mortality
I	2000	No dermal reaction observed	5	6 - 10	Day 0 - Day 14	0/5

 

 

Table No.III

Mean Body Weight and Percent Body Weight Gain (g)

Test System : Sprague Dawley Rat

Sex : Male

Group No.	Dose (mg/kg body weight)		Body weight Day 0	Body weight Day 7	% body weight gain day 0-7	Body weight Day 14	% body weight gain day 7- 14	% body weight gain day 0- 14
I	2000	Mean	256.06	281.76	10.03	304.72	8.15	18.99
		± SD	2.43	5.81	1.52	6.93	0.31	1.84

 

Sex : Female

Group No.	Dose (mg/kg body weight)		Body weight Day 0	Body weight Day 7	% body weight gain day 0-7	Body weight Day 14	% body weight gain day 7- 14	% body weight gain day 0- 14
I	2000	Mean	227.60	242.46	6.51	252.94	4.31	11.11
		± SD	3.24	7.12	1.67	8.70	1.01	2.30

 

 

Table No.IV

Summary of Gross Pathological Findings

Test System : Sprague Dawley Rat

Sex : Male

Group No.	Dose mg/kg	Animal Numbers	Animal Fate	Gross Pathological Findings
I	2000	1 - 5	TS	No abnormality detected

 

Sex : Female

Group No.	Dose mg/kg	Animal Numbers	Animal Fate	Gross Pathological Findings
I	2000	6 - 10	TS	No abnormality detected

TS = Terminal Sacrifice

Interpretation of results:

other: Not irritating

Conclusions:

The overall irritation score of the substance was determined to be 0 and no erythema and edema (skin irritation) were found at the end of 14 days observation period after patch removal.
Hence, it was concluded that the test chemical was Non-Irritating to the skin of Sprague Dawley rats under the experimental conditions tested and classified as “Category- Not Classified” as per CLP Classification.

Executive summary:

A study was designed and conducted to determine the dermal reaction profile of the test chemical in Sprague Dawley rats. The study was performed as per OECD Guidelines 402 and complying to the GLP procedures. Ten rats (5 male and 5 female) were used for conducting dermal irritation /corrosion study.

The animals were kept in their cages for at least 5 days prior to administration for acclimatization to the laboratory condition and after acclimatization period, animals were randomly selected. Approximately 24 hours before application, the hair of each rat was closely clipped from the trunk (dorsal surface and sides from scapular to pelvic area) with an electric clipper, so as to expose at least 10% of the body surface area. The test item was moistened with distilled water. The test item was applied onto the exposed skin of the animal, taking care to spread the test item evenly over the entire area of approximately 10% of the total body surface area or as much of the area as can reasonably be covered. The test item was held in contact with the skin using a porous gauze dressing and non irritating tape around the animal to cover the exposure site for first 24 hours exposure period. Elizabethan collar was placed on each animal for first 24 hours after application of the test item. These collars prevent ingestion of test item. Following 24 hours of exposure, the wrapping was removed and the test site wiped free of excess test item. Distilled water was used to remove residual test item.

 

The test item was applied to shorn skin of 5 male and 5 female animals at 2000 mg/kg body weight. Administration of the test item at 2000 mg/kg did not result in any skin reaction at the site of application during the study period of 14 days. Administration of the test item did not result in any signs of toxicity and mortality during the study period of 14 days.

The overall irritation score of the substance was determined to be 0 and no erythema and edema (skin irritation) were found at the end of 14 days observation period after patch removal.

Hence, it was concluded that the test chemical was Non-Irritating to the skin of Sprague Dawley rats under the experimental conditions tested and classified as “Category- Not Classified” as per CLP Classification.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Eye irritation

Link to relevant study records

Reference

Endpoint:

eye irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

December 06, 2017 to March 24, 2018

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Justification for type of information:

Data is from experimental study report.

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)

Principles of method if other than guideline:

The purpose of this study is to provide classification of chemicals concerning their eye irritation potential using an alternative to the Draize Rabbit Eye Test, according to the OECD Test Guideline No. 492, “Reconstructed Human Cornea-like Epithelium (RhCE) Test Method for Identifying Chemicals Not Requiring Classification and Labelling for Eye Irritation or Serious Eye Damage”. The EpiOcular™ EIT is intended to differentiate those materials that are UN GHS No Category (i.e., do not meet the requirements for UN GHS classification) from those that would require labeling as either UN GHS Category 1 or 2. This assay is not intended to differentiate between UN GHS Category 1 / Hazard
Code 318 and UN GHS Category 2 / Hazard Codes 319 and 320.

GLP compliance:

yes

Specific details on test material used for the study:

- Name of test material: 2,2'-(ethene-1,2-diyldi-4,1-phenylene)bis(1,3-benzoxazole)
- Molecular formula: C28H18N2O2
- Molecular weight: 414.462 g/mol
- Smiles notation: n1c2ccccc2oc1c1ccc(\C=C\c2ccc(c3oc4ccccc4n3)cc2)cc1
- InChl: 1S/C28H18N2O2/c1-3-7-25-23(5-1)29-27(31-25)21-15-11-19(12-16-21)9-10-20-13-17-22(18-14-20)28-30-24-6-2-4-8-26(24)32-28/h1-18H/b10-9+
- Substance type: Organic
- Physical state: Solid

SOURCE OF TEST MATERIAL
- Test Item: 2,2’-(vinylenedi-p-phenylene)bisbenzoxazole (CAS No. 1533-45-5)
- Source of test material: Sustainability Support Services (Europe) AB
- Batch No.of test material: OBA201405A
- Manufacturing Date: October 2016
- Expiration date of the lot/batch: October 2019
- Purity test date: No data available
- Consistency: Solid, crystalline powder

RADIOLABELLING INFORMATION (Not applicable)
- Radiochemical purity: N/A
- Specific activity: N/A
- Locations of the label: N/A
- Expiration date of radiochemical substance: N/A

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: Ambient Temperature
- Stability under test conditions: No data available
- Solubility and stability of the test substance in the solvent/vehicle: No data available
- Reactivity of the test substance with the solvent/vehicle of the cell culture medium: No data available

TREATMENT OF TEST MATERIAL PRIOR TO TESTING
- Treatment of test material prior to testing: Test item was grounded to fine powder prior to application. The particulates were moistened with distilled water before application.
- Preliminary purification step (if any):No data available
- Final dilution of a dissolved solid, stock liquid or gel: No data available
- Final preparation of a solid: No data available

FORM AS APPLIED IN THE TEST: Paste

OTHER SPECIFICS:
Safety Precautions : Safety precautions included use of protective clothing, gloves, masks and eye protection (glasses).


RADIOLABELLING INFORMATION (Not applicable)
- Radiochemical purity: N/A
- Specific activity: N/A
- Locations of the label: N/A
- Expiration date of radiochemical substance: N/A

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: Room temperature / Fridge storage
- Stability under test conditions: No data available
- Solubility and stability of the test substance in the solvent/vehicle: No data available
- Reactivity of the test substance with the solvent/vehicle of the cell culture medium: No data available

TREATMENT OF TEST MATERIAL PRIOR TO TESTING
- Treatment of test material prior to testing: The test article tested as provided neat (undiluted).
- Preliminary purification step (if any): No data available
- Final dilution of a dissolved solid, stock liquid or gel: No data available
- Final preparation of a solid: No data available

FORM AS APPLIED IN THE TEST: Solid

OTHER SPECIFICS: No data available

Species:

other: MatTek EpiOcular Tisssue Model OCL-200

Strain:

other: Not applicable

Details on test animals or tissues and environmental conditions:

-Test System: MatTek EpiOcular™ Tissue Model OCL-200

Storage:EpiOcular™ tissues and assay medium will be refrigerated at approximately 2-8°C upon arrival and until use.

Supplier:MatTek Corporation, Ashland, MA

- Justification of the test method and considerations regarding applicability
The EpiOcular™ Tissue Model closely parallels human ocular tissue, thus providing a useful in vitro means to assess ocular irritancy and toxicology

Vehicle:

unchanged (no vehicle)

Controls:

yes, concurrent positive control

yes, concurrent negative control

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 50 mg

VEHICLE (no vehicle)
- Amount(s) applied (volume or weight with unit): none
- Concentration (if solution): none
- Lot/batch no. (if required): none
- Purity: none

NEGATIVE CONTROL
- Amount(s) applied (volume or weight): 50 µL
- Concentration (if solution): neat

POSITIVE CONTROL
- Amount(s) applied (volume or weight): 50 µL
- Concentration (if solution): neat

Duration of treatment / exposure:

Tissues will be topically exposed to the test article and control articles for 6 hours ± 15 minutes.

Observation period (in vivo):

Not applicable

Duration of post- treatment incubation (in vitro):

Following the post soak,Tissues will be incubated in 1 ml fresh assay medium in a humidified 37±1°C, 5±1% CO2 incubator.

Number of animals or in vitro replicates:

2 tissues were used for test compound and control.

Details on study design:

-Plate Reader Linearity Check:
The linearity of the plate reader or spectrophotometer used for optical density (OD) determination will be verified prior to its use the same week the EIT assay is being
performed.
A dilution series of trypan blue or thiazolyl blue tetrazolium bromide (MTT) formazan will be prepared and 200 μl aliquots will be pipetted into a 96-well plate.
The optical density of the plate wells will be measured at a wavelength of 570 nm (OD570), with no reference wavelength.
A regression line and an R-squared value will be generated using Microsoft Excel®. Verification will be considered acceptable if the R-squared value is >0.999.

Assessment of Direct MTTReduction:No assessment of the direct MTT (methyl thiazole tetrazolium) reduction potential of each test article will be made.

-Assessment of Coloring or Staining Materials:
No assessment of each test article’s ability to absorb light at the wavelength (570 nm) used for MTT determination will be made.

- Pre-Incubation:
EpiOcular™ tissues will be placed in six-well plates containing warmed assay media and will be equilibrated in a humidified 37±1°C, 5 ±1% CO2 incubator for at least one hour. The media will then be changed and the tissues incubated overnight (16-24 hours).
Any tissues not being incubated the same day will be allowed to re-equilibrate at 37±1°C, 5±1% CO2 and will be stored at approximately 2-8°C..

-Pre-Treatment:After the overnight incubation, the tissues will be moistened with 20 μl of phosphatebuffered saline (PBS) and incubated at 37±1°C, 5±1% CO2 for 30±2 minutes.

-Dosing:Whenever possible, solids should be ground to a fine powder before application. 50 mg of a solid test article will be applied topically to duplicate tissues
and incubated at 37±1°C, 5±1% CO2 for 6 hours ± 15 minutes.
After dosing and incubation, the tissues will be thoroughly rinsed with PBS and soaked in 5 ml of room-temperature assay medium in a 12-well plate for the appropriate amount of time.
Tissues will be soaked for 25±2 minutes.

-MTT Extraction:
Following the three-hour MTT incubation period, each tissue will be removed individually and gently rinsed with PBS to remove any residual MTT solution.
The extraction plate will be covered and sealed to reduce evaporation of extractant.
For solid, colored, or staining test articles, 2.0 ml of extractant solution will be used in a six-well plate, allowing extraction to occur through the bottom of the insert.
 
Extraction Conditions:The extraction will be allowed to proceed overnight at room temperature in the dark.
Alternatively, the extraction can proceed for at least two hours, with shaking, at room temperature.

-Decant Extractant:
Tissues immersed in extractant solution in a 24-well plate: After the extraction period is complete, the liquid within each tissue insert will be decanted back into the well
from which it was taken, i.e., the solution will be mixed with the extractant in the well.
The tissue inserts will then be discarded.

-Transferring to 96-Well Plate:Two 200 μl aliquots from each well of the extraction plate(s) will be pipetted into a 96- well microtiter plate.

-Measuring Optical Density:The optical density of the extracted samples will be determined at a single wavelength of 570 nm and using eight 200 μl aliquots of the Extractant as blanks.

Calculating Percent Viability:
The percent viability of the test tissues will be determined using the following formula:
% Viability = 100 x (ODsample / ODNegative Control)

Quality Controls:
Negative Controls: The assay meets the acceptance criterion if the OD570 of the Negative Control is greater than 0.8 and less than 2.5.
Positive Controls: The assay meets the acceptance criterion if the mean relative viability of the positive control is below 50% of negative control viability.
Tissue Variability: The difference in viability between identically treated tissues must be less than 20%. This applies to tissues treated with the same test article as well as living and killed controls.

Ocular Irritation Potential:
An irritant is predicted if the mean relative tissue viability of two individual tissues exposed to the test substance is less than or equal to 60% of the mean viability of the
negative control-treated tissue viability.

In Vitro Result In Vivo Prediction (GHS3)
Mean tissue viability ≤ 60% Category 1 / Hazard Code 318, or
Category 2 / Hazard Codes 319 and 320
Mean tissue viability > 60% No Category (Non-Irritating)

Borderline Results:
If the test article-treated tissue viability is 60±5%, a second EIT should be performed. If the results of the second test disagree with the first, then a third test should be performed. The conclusion will be based on the agreement of two of the three tests.

Duration:The duration of the EpiOcularTM Eye Irritation Test is approximately five days.

Irritation parameter:

other: mean % tissue viability

Run / experiment:

Run 1

Value:

95.1

Vehicle controls validity:

valid

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

no indication of irritation

Other effects / acceptance of results:

Negative Controls: The assay meets the acceptance criterion if the OD570 of the Negative Control is greater than 0.8 and less than 2.5.
Positive Controls: The assay meets the acceptance criterion if the mean relative viability of the positive control is below 50% of negative control viability.
Tissue Variability: The difference in viability between identically treated tissues must be less than 20%.

Tissue Viability		Irritancy Classification	GHS Category
Mean	SD
95.1	6.45	Non-Irritant	Not Classified

Test and control article identity	Tissue no.	Raw data		Blank corrected data		Mean of aliquots	% viability	OD		Viabilities (%)
								MEAN	SD	Mean	SD
		Aliq 1	Aliq 2	Aliq 1	Aliq 2
1533-45-5	1	1.533	1.482	1.486	1.435	1.461	91.9	1.512	0.103	95.1	6.45
	2	1.609	1.611	1.562	1.564	1.563	98.4

Interpretation of results:

other: not irritating

Conclusions:

The ocular irritation potential of test article was determined according to the OECD 492 test guideline. The mean % tissue viability of test substance was determined to be 95.1%. Thus, test chemical was considered to be not irritating to MatTek EpiOcular Tisssue Model OCL-200.

Executive summary:

The ocular irritation potential of test article was determined according to the OECD 492 test guideline. The MatTek EpiOcular™ model was used to assess the potential ocular irritation of the test article by determining the viability of the tissues following exposure to the test article via MTT. The objective of this study was to assess the ocular irritation potential of test article. Tissues were exposed to test article and controls for ~6 hours, followed by a ~25 minute post-soak and approximately 18 hour recovery after the post-soak. The viability of each tissue was determined by MTT assay. 

The mean OD570 of the negative control tissues was 1.665 and 1.589, which met the acceptance criteria of greater than 0.8 and less than 2.5. The mean relative viability of the positive control tissues was 45.2 and 36.5, which met the acceptance criterion of less than 50%. The differences in viability between identically treated tissues were 0.03 to 5.60, which met the acceptance criterion of less than 50%. All controls passed the acceptance criteria for a valid study.

The mean % tissue viability of test chemical was determined to be 95.1%. Hence, under the experimental test conditions it was concluded that test chemical was considered to be not irritating to the MatTek EpiOcular Tissue Model OCL-200 and being classified as “Not classified’’.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Respiratory irritation

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

Skin Irritation

In different studies,the test chemical has been investigated for its potential to cause dermal irritation to a greater or lesser extent. The studies are based on in vivo experiments in rabbits along with in vitro experiments for the test chemicals. The results of the in vivo experiment have also been compared with estimated data for the target chemical.

 

A study was designed and conducted to determine the dermal reaction profile of the test chemical in Sprague Dawley rats. The study was performed as per OECD Guidelines 402 and complying to the GLP procedures. Ten rats (5 male and 5 female) were used for conducting dermal irritation /corrosion study.

The animals were kept in their cages for at least 5 days prior to administration for acclimatization to the laboratory condition and after acclimatization period, animals were randomly selected. Approximately 24 hours before application, the hair of each rat was closely clipped from the trunk (dorsal surface and sides from scapular to pelvic area) with an electric clipper, so as to expose at least 10% of the body surface area. The test item was moistened with distilled water. The test item was applied onto the exposed skin of the animal, taking care to spread the test item evenly over the entire area of approximately 10% of the total body surface area or as much of the area as can reasonably be covered. The test item was held in contact with the skin using a porous gauze dressing and non irritating tape around the animal to cover the exposure site for first 24 hours exposure period. Elizabethan collar was placed on each animal for first 24 hours after application of the test item. These collars prevent ingestion of test item. Following 24 hours of exposure, the wrapping was removed and the test site wiped free of excess test item. Distilled water was used to remove residual test item.  

The test item was applied to shorn skin of 5 male and 5 female animals at 2000 mg/kg body weight. Administration of the test item at 2000 mg/kg did not result in any skin reaction at the site of application during the study period of 14 days. Administration of the test item did not result in any signs of toxicity and mortality during the study period of 14 days.

The overall irritation score of the substance was determined to be 0 and no erythema and edema (skin irritation) were found at the end of 14 days observation period after patch removal.

Hence, it was concluded that the test chemical was Non-Irritating to the skin of Sprague Dawley rats under the experimental conditions tested and classified as “Category- Not Classified” as per CLP Classification.

This is supported by the results of an invitro study performed according to the OECD 439 In Vitro Skin Irritation: Reconstructed Human Epidermis Test Method” to determine the irritation potential of the test chemical. The MatTek EpiDerm™ model was used to assess the potential dermal irritation of the test article by determining the viability of the tissues following exposure to the test article via MTT. The objective of this study was to assess the dermal irritation potential of test article Tissues were exposed to test article and controls for ~one hour, followed by a 42 hour post-exposure recovery period. The viability of each tissue was determined by MTT assay. 

The MTT data shows that the assay quality controls were met. The mean tissue viabilities for the Positive control, Methyl acetate were 6.5%, 10.7% respectively in the first and second run, whereas the tissue viabilities of the negative control, Tissue culture water remained at 100% in the both the runs.

The Mean % tissue viability compared to negative control (n=3) of the test chemical was determined to be 98.1%.

Hence, under the experimental test conditions it was concluded that the test chemical was considered to be not irritating to the human skin and being classified as “Not Classified'' as per CLP Regulation.

The above results are also supported by the study conducted to assess the dermal irritation potential of the test chemical in rabbits. The test chemical was applied to the skin of rabbits and observed for signs of irritation (dose, duration and observation period not specified).No signs of irritation were observed in rabbits. Hence, the test chemical can be considered to be not irritating to rabbit skin.

Skin irritation effects were also estimated by four different models i.e, Battery, Leadscope, SciQSAR and CASE Ultra used within Danish QSAR database for the test chemical. Based on estimation, no severe skin irritation effects were known when the test chemical was exposed to rabbit skin.

The experimental and estimated data for the test chemical are in mutual agreement with each other, indicating a very strong possibility of the test chemical being not irritating to skin.

The above studies are further supported by the experimental study for the test chemicalconducted as per OECD 404 Guidelines. 3 young adult male New Zealand White rabbits weighing 2.2 to 2.3 kg were used for the study. They were housed individually in metal cages, were kept at a constant room temperature of 20±3 °C, at a relative humidity of 30-70%, and on a 12 hours light cycle day. The animals received ad libitum standard pelleted rabbit food (Nafag No. 814; Gossau, Switzerland) and water. Prior to treatment they were acclimatized for a minimum of 5 days. The test article was applied as a liquid formulation containing 21.3% FWA-5 in water.

About 24-hours before treatment an area of about 6 sq. cm was shaved on both flanks of each rabbit. Gauze patch of 2.5 x 2.5 cm covered with 0.5 mL of the test material was applied to one flank and a control patch to the contralateral flank. The patches were covered with an impermeable material and were fastened to the body of the rabbit with adhesive tape. The duration of treatment was four hours. The scoring of skin reaction was performed 1, 24, 48 and 72 hours after removal of the dressing. These scores were used in calculating the respective mean values for each type of lesion.

At one hour, erythema was observed in each animal (one with grade 2; two with grade 1) as was grade 1 edema. At 24-hours, no signs of erythema or edema were observed. The calculated primary irritation index was 0.00 (max.8.0).The test chemical did not cause any staining to skin. Also, no signs of corrosion were observed through out the study.

Based on the scores and observations, the test chemical can be considered to be not irritating to skin.

Available studies fortest chemicalindicate that it lacks the potential to cause any dermal reaction to the skin. Hence, it can be considered to be not irritating to skin. Comparing the above annotations with the criteria of the CLP regulation, the test chemical can be classified under the category “Not Classified”.

Eye Irritation:

Various studies have been summarized to determine the extent of ocular damage caused by the test chemical in living organisms. The studies are based on in vivo experiments in rabbits along with in vitro data for test chemical.

The ocular irritation potential of test article was determined according to the OECD 492 test guideline. The MatTek EpiOcular™ model was used to assess the potential ocular irritation of the test article by determining the viability of the tissues following exposure to the test article via MTT. The objective of this study was to assess the ocular irritation potential of test article. Tissues were exposed to test article and controls for ~6 hours, followed by a ~25 minute post-soak and approximately 18 hour recovery after the post-soak. The viability of each tissue was determined by MTT assay. 

The mean OD570 of the negative control tissues was 1.665 and 1.589, which met the acceptance criteria of greater than 0.8 and less than 2.5. The mean relative viability of the positive control tissues was 45.2 and 36.5, which met the acceptance criterion of less than 50%. The differences in viability between identically treated tissues were 0.03 to 5.60, which met the acceptance criterion of less than 50%. All controls passed the acceptance criteria for a valid study.

The mean % tissue viability of test chemical was determined to be 95.1%. Hence, under the experimental test conditions it was concluded that test chemical was considered to be not irritating to the MatTek EpiOcular Tissue Model OCL-200 and being classified as “Not classified’’.

This in vitro result is supported by a study performed in rabbits to assess the irritation potential of the test chemical. 100 µl of undiluted test chemical was instilled in the eyes of rabbits and observed for signs of irritation(duration of exposure not mentioned).No signs of irritation were observed. Hence, the test chemical can be considered to be not irritating to rabbit eyes.

The above results are further supported an eye irritation study conducted on New Zealand rabbits to observe the irritation effects caused by the test chemical. 0.1ml of 30% aqueous solution was instilled into conjunctival sac of left eye of 3 male New Zealand rabbits while the other untreated right eye served as control. The treated eyes were observed till 7 days for signs of irritation. No abnormalities were recorded over the 7 day observation period. Hence, the chemical was considered to be not irritating to the eyes of New Zealand rabbits.

Available studies fortest chemical indicate that it lacks the potential to cause any irritation to the eyes. Hence, it can be considered to be not irritating to eyes. Comparing the above annotations with the criteria of the CLP regulation, the test chemical can be classified under the category “Not Classified”.

Justification for classification or non-classification

Available studies for the test chemical indicate that it is not likely to cause any irritation to skin and eyes.

Hence, the test chemical can be classified under the category “Not Classified” as per CLP regulation.