Barium 3-hydroxy-4-[(4-methyl-2-sulphonatophenyl)azo]-2-naphthoate

Endpoint summary

Description of key information

Skin Irritation:

Based on the available data for the structurally similar read across substances and applying the weight of evidence approach, it can be concluded that barium 3-hydroxy-4-[(4-methyl-2-sulfonatophenyl)diazenyl]-2-naphthoate will also tend to behave in a similar that of the read across substances. Therefore the target chemical was estimated to be not irritating to skin and it can be further classified under the category “Not Classified” as per CLP regulation.

Eye Irritation:

Based on the available data for the structurally similar read across substances and applying the weight of evidence approach, it can be concluded that barium 3-hydroxy-4-[(4-methyl-2 -sulfonatophenyl)diazenyl]-2-naphthoate will also tend to behave in a similar that of the read across substances. Therefore the target chemical was estimated to be not irritating to eyes and it can be further classified under the category “Not Classified” as per CLP regulation.

Key value for chemical safety assessment

Skin irritation / corrosion

Link to relevant study records

Reference

Endpoint:

skin irritation: in vivo

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Weight of evidence approach based on structurally similar chemicals

Justification for type of information:

Weight of evidence approach based on structurally similar chemicals

Reason / purpose for cross-reference:

read-across: supporting information

Reason / purpose for cross-reference:

read-across: supporting information

Qualifier:

according to guideline

Guideline:

other: Weight of evidence approach based on structurally similar chemicals

Principles of method if other than guideline:

The weight of evidence report has been prepared based on the read across substances identified based on structural and functional similarity to assess the dermal irritation potential of barium 3-hydroxy-4-[(4-methyl-2-sulfonatophenyl)diazenyl]-2-naphthoate

GLP compliance:

not specified

Specific details on test material used for the study:

- Name of test material: barium 3-hydroxy-4-[(4-methyl-2-sulfonatophenyl)diazenyl]-2-naphthoate- Molecular formula: C18H14N2O6S.Ba- Molecular weight: 521.697 g/mol- Smiles notation: [Ba+2].c1c(c(c(c2ccccc12)\N=N\c1c(cc(cc1)C)S(=O)(=O)[O-])O)C(=O)[O-]- InChl: 1S/C18H14N2O6S.Ba/c1-10-6-7-14(15(8-10)27(24,25)26)19-20-16-12-5-3-2-4-11(12)9-13(17(16)21)18(22)23;/h2-9,21H,1H3,(H,22,23)(H,24,25,26);/q;+2/p-2/b20-19+;- Substance type: Organic- Physical State: Solid

Species:

other: rabbits, rats

Strain:

not specified

Type of coverage:

occlusive

Preparation of test site:

clipped

Vehicle:

other: unchanged, propylene glycol

Controls:

not specified

Amount / concentration applied:

1. 2000 mg/kg2. 1ml of 10% concentration in propylene glycol

Duration of treatment / exposure:

1. 24 hours2. once daily for 5 days per week for 2 weeks

Observation period:

14 days

Number of animals:

1. 32. colony of rabbits

Details on study design:

The study is based on weight of evidence approach from the read across values

Irritation parameter:

overall irritation score

Basis:

mean

Time point:

14 d

Reversibility:

not specified

Remarks on result:

no indication of irritation

Irritant / corrosive response data:

No signs of irritation observed

Interpretation of results:

other: not irritating

Conclusions:

Based on the available data for the structurally similar read across substances and applying the weight of evidence approach, it can be concluded that barium 3-hydroxy-4-[(4-methyl-2-sulfonatophenyl)diazenyl]-2-naphthoate will also tend to behave in a similar that of the read across substances. Therefore the target chemical was estimated to be not irritating to skin and it can be further classified under the category “Not Classified” as per CLP regulation.

Executive summary:

Based on the available studies for the structurally similar read across chemicals, weight of evidence approach was applied to assess the dermal irritation potential of barium 3-hydroxy-4-[(4-methyl-2-sulfonatophenyl)diazenyl]-2-naphthoate .

A study was designed and conducted to determine the dermal reaction profile of the structurally similar read across 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 applied directly 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 chemical 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. Also, the erythema and edema score of rats was calculated as 0. Administration of the test item did not result in any signs of toxicity and mortality during the study period of 14 days. Animals exhibited normal body weight gain through the study period of 14 days. Gross pathological examination did not reveal any abnormalities attributable to the treatment.

Thus it can be concluded that the test chemical can be considered to be not irritating to skin and classified under "Not Classified" category.

This result is supported by a study performed to determine the Comedogenicity and irritancy potential of the test chemical. The dyes were mixed in propylene glycol at a 9 to 1 dilution for testing unless otherwise indicated (10% concentration). A colony of New Zealand albino rabbits that have genetically good ears and free from mites were used. Three rabbits, weighing two to three kilograms, were used for each assay. Animals were housed singly in suspended cages and fed Purina Rabbit Chow and water ad libitum. Animals were maintained on a 12-hour light and 12-hour dark cycle. A dose of 1 ml of the test material was applied and spread once daily to the entire inner surface of once for five days per week for two weeks. The opposite untreated ear of each animal served as an untreated control. The irritancy produced by repeated application of the chemical on the surface epidermis in the rabbit ear is evaluated on a scale of 0 to 5. The grades are summarized as follows:

0 = No irritation; 1 = few scales, no Erythema; 2 = diffuse scaling, no Erythema; 3 = Generalized scaling with Erythema; 4 = Scaling, Erythema and Edema; 5 = Epidermal necrosis and slough.

The test chemical falls under Grade 0 (no irritation observed).Hence it can be concluded that the test chemical was not irritating to rabbit ears.

Based on the available data for the structurally similar read across substances and applying the weight of evidence approach, it can be concluded that barium 3-hydroxy-4-[(4-methyl-2-sulfonatophenyl)diazenyl]-2-naphthoate will also tend to behave in a similar that of the read across substances. Therefore the target chemical was estimated to be not irritating to skin and it can be further classified under the category “Not Classified” as per CLP regulation.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Eye irritation

Link to relevant study records

Reference

Endpoint:

eye irritation: in vivo

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Weight of evidence approach based on structurally similar chemicals

Justification for type of information:

Weight of evidence approach based on structurally similar chemicals

Reason / purpose for cross-reference:

read-across: supporting information

Reason / purpose for cross-reference:

read-across: supporting information

Qualifier:

according to guideline

Guideline:

other: Weight of evidence approach based on similar chemicals

Principles of method if other than guideline:

The weight of evidence report has been prepared based on the read across substances identified based on structural and functional similarity to assess the ocular irritation potential of barium 3-hydroxy-4-[(4-methyl-2-sulfonatophenyl)diazenyl]-2-naphthoate

GLP compliance:

not specified

Specific details on test material used for the study:

- Name of test material: barium 3-hydroxy-4-[(4-methyl-2-sulfonatophenyl)diazenyl]-2-naphthoate- Molecular formula: C18H14N2O6S.Ba- Molecular weight: 521.697 g/mol- Smiles notation: [Ba+2].c1c(c(c(c2ccccc12)\N=N\c1c(cc(cc1)C)S(=O)(=O)[O-])O)C(=O)[O-]- InChl: 1S/C18H14N2O6S.Ba/c1-10-6-7-14(15(8-10)27(24,25)26)19-20-16-12-5-3-2-4-11(12)9-13(17(16)21)18(22)23;/h2-9,21H,1H3,(H,22,23)(H,24,25,26);/q;+2/p-2/b20-19+;- Substance type: Organic- Physical State: Solid

Species:

rabbit

Strain:

not specified

Vehicle:

unchanged (no vehicle)

Controls:

not specified

Amount / concentration applied:

1. 0.2 ml of a 10% aqueous suspension 2. 0.2 ml of a 10% aqueous solution (20 mg)

Duration of treatment / exposure:

5 times per week for 4 weeks

Observation period (in vivo):

4 weeks

Duration of post- treatment incubation (in vitro):

no data available

Number of animals or in vitro replicates:

no data available

Details on study design:

The study is based on weight of evidence approach from the read across values

Irritation parameter:

overall irritation score

Basis:

mean

Time point:

other: 4 weeks

Reversibility:

not specified

Remarks on result:

no indication of irritation

Irritant / corrosive response data:

No signs of irritation observed

Interpretation of results:

other: not irritating

Conclusions:

Based on the available data for the structurally similar read across substances and applying the weight of evidence approach, it can be concluded that barium 3-hydroxy-4-[(4-methyl-2-sulfonatophenyl)diazenyl]-2-naphthoate will also tend to behave in a similar that of the read across substances. Therefore the target chemical was estimated to be not irritating to eyes and it can be further classified under the category “Not Classified” as per CLP regulation.

Executive summary:

Based on the available studies for the structurally similar read across chemicals, weight of evidence approach was applied to assess the ocular irritation potential of barium 3-hydroxy-4-[(4-methyl-2-sulfonatophenyl)diazenyl]-2-naphthoate .

The local eye irritative potential of the structurally similar read across chemical was investigated in rabbits’ eye to assess the degree of eye irritancy caused by the chemical.

Each rabbit received 2 installations of 0.2 ml of a 10% aqueous suspension of the test chemical into the conjunctival sac of rabbits 5 times per week for 4 weeks. The chemical produced only minimal irritative effects after 2 hours which could not confirmed the irritation potential. Hence, on the basis of findings, the test chemical can be considered as not irritating to the rabbits’ eye.

The above result is supported by a study conducted to determine the irritation potential of another structurally similar read across chemical on rabbit eyes.

0.2 ml of a 10% aqueous solution (20 mg) or suspension of the test material was applied twice daily, five times weekly, for four weeks to the conjunctival sac of one eye of each of a group of six or more albino rabbits (40 applications). One hour after each application, the eyes were examined for evidence of staining and the irritation was scored according to Draize.

The overall irritation score after 20 days of observation was 0.0. Hence, the test chemical was considered to be not irritating to rabbit eyes.

Based on the available data for the structurally similar read across substances and applying the weight of evidence approach, it can be concluded that barium 3-hydroxy-4-[(4-methyl-2-sulfonatophenyl)diazenyl]-2-naphthoate will also tend to behave in a similar that of the read across substances. Therefore the target chemical was estimated to be not irritating to eyes and it can be further classified under the category “Not Classified” as per CLP regulation.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Respiratory irritation

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

Skin Irritation:

Based on the available studies for the structurally similar read across chemicals, weight of evidence approach was applied to assess the dermal irritation potential of barium 3-hydroxy-4 -[(4-methyl-2-sulfonatophenyl)diazenyl]-2-naphthoate .

A study was designed and conducted to determine the dermal reaction profile of the structurally similar read across 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 applied directly 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 chemical 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. Also, the erythema and edema score of rats was calculated as 0. Administration of the test item did not result in any signs of toxicity and mortality during the study period of 14 days. Animals exhibited normal body weight gain through the study period of 14 days. Gross pathological examination did not reveal any abnormalities attributable to the treatment.

Thus it can be concluded that the test chemical can be considered to be not irritating to skin and classified under "Not Classified" category.

This result is supported by a study performed to determine the Comedogenicity and irritancy potential of the test chemical. The dyes were mixed in propylene glycol at a 9 to 1 dilution for testing unless otherwise indicated (10% concentration). A colony of New Zealand albino rabbits that have genetically good ears and free from mites were used. Three rabbits, weighing two to three kilograms, were used for each assay. Animals were housed singly in suspended cages and fed Purina Rabbit Chow and water ad libitum. Animals were maintained on a 12 -hour light and 12-hour dark cycle. A dose of 1 ml of the test material was applied and spread once daily to the entire inner surface of once for five days per week for two weeks. The opposite untreated ear of each animal served as an untreated control. The irritancy produced by repeated application of the chemical on the surface epidermis in the rabbit ear is evaluated on a scale of 0 to 5. The grades are summarized as follows:

0 = No irritation; 1 = few scales, no Erythema; 2 = diffuse scaling, no Erythema; 3 = Generalized scaling with Erythema; 4 = Scaling, Erythema and Edema; 5 = Epidermal necrosis and slough.

The test chemical falls under Grade 0 (no irritation observed).Hence it can be concluded that the test chemical was not irritating to rabbit ears.

Based on the available data for the structurally similar read across substances and applying the weight of evidence approach, it can be concluded that barium 3-hydroxy-4-[(4-methyl-2 -sulfonatophenyl)diazenyl]-2-naphthoate will also tend to behave in a similar that of the read across substances. Therefore the target chemical was estimated to be not irritating to skin and it can be further classified under the category “Not Classified” as per CLP regulation.

Eye Irritation:

Based on the available studies for the structurally similar read across chemicals, weight of evidence approach was applied to assess the ocular irritation potential of barium 3-hydroxy-4 -[(4-methyl-2-sulfonatophenyl)diazenyl]-2-naphthoate .

The local eye irritative potential of the structurally similar read across chemical was investigated in rabbits’ eye to assess the degree of eye irritancy caused by the chemical.

Each rabbit received 2 installations of 0.2 ml of a 10% aqueous suspension of the test chemical into the conjunctival sac of rabbits 5 times per week for 4 weeks. The chemical produced only minimal irritative effects after 2 hours which could not confirmed the irritation potential. Hence, on the basis of findings, the test chemical can be considered as not irritating to the rabbits’ eye.

The above result is supported by a study conducted to determine the irritation potential of another structurally similar read across chemical on rabbit eyes.

0.2 ml of a 10% aqueous solution (20 mg) or suspension of the test material was applied twice daily, five times weekly, for four weeks to the conjunctival sac of one eye of each of a group of six or more albino rabbits (40 applications). One hour after each application, the eyes were examined for evidence of staining and the irritation was scored according to Draize.

The overall irritation score after 20 days of observation was 0.0. Hence, the test chemical was considered to be not irritating to rabbit eyes.

Based on the available data for the structurally similar read across substances and applying the weight of evidence approach, it can be concluded that barium 3-hydroxy-4-[(4-methyl-2 -sulfonatophenyl)diazenyl]-2-naphthoate will also tend to behave in a similar that of the read across substances. Therefore the target chemical was estimated to be not irritating to eyes and it can be further classified under the category “Not Classified” as per CLP regulation.

Justification for classification or non-classification

The results of the experimental studies from the structurally similar read across substances indicate a possibility that barium 3-hydroxy-4-[(4-methyl-2-sulfonatophenyl)diazenyl]-2-naphthoate can be not irritating to skin and eyes.

Hence by applying the weight of evidence approach, barium 3-hydroxy-4-[(4-methyl-2-sulfonatophenyl)diazenyl]-2-naphthoate can be considered to be not irritating to skin and eyes. It can be classified under the category “Not Classified” as per CLP regulation.