2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt

Endpoint summary

Description of key information

Skin irritation

The dermal irritation potential of target chemical 2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt (CAS No: 93941-74-3) was assessedin various experimental studies which were conducted on rabbits for target chemical2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt (CAS No: 93941-74-3)  and its structurally similar read across substancesTetra sodium 1-acetamido-2-hydroxy-3-(4-((4-sulphonatophenylazo)-7-sulphonato-1-naphthylazo))naphthalene-4,6-disulphonate[CAS:2519 -30 -4]andaluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex {CAS No: 15790-07-5}. The predicted data usingQSAR toolbox and Danish QSAR databasehas also been compared with the experimental data.Based on the available data for the target and read across substances and applying the weight of evidence approach, it can be concluded that chemical 2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt (CAS No: 93941-74-3)  is unable to cause skin irritation and thus considered as not irritating. Comparing the above annotations with the criteria of CLP regulation, it can be classified under the category “Not Classified”.

 

Eye irritation

An ocular irritation potential of target chemical 2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt (CAS No: 93941-74-3)  was assessedin various experimental studies which were conducted on rabbits for target chemical2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt (CAS No: 93941-74-3)  and its structurally similar read across substancealuminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex (CAS No: 15790-07-5) andfunctionally similar read across substancesDisodium 3-[(2,4-dimethyl-5-sulphonatophenyl)azo]-4-hydroxynaphthalene-1-sulphonate [CAS: 4548-53-2] and 1,3 -Naphthalenedisulfonic acid, 7-hydroxy-8-((4-sulfo-1-naphthalenyl)azo)-, trisodium salt (Acid Red 18) [2611-82-7]. The predicted data usingQSAR toolboxhas also been compared with the experimental data.Based on the available data for the target and read across substances and applying the weight of evidence approach, it can be concluded that chemical 2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt (CAS No: 93941-74-3)  is unable to cause eye damage and thus can be considered as not irritating. Comparing the above annotations with the criteria of CLP regulation, it can be classified under the category “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:

weight of evidence

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Justification for type of information:

data is from experimental reports

Qualifier:

according to guideline

Guideline:

OECD Guideline 404 (Acute Dermal Irritation / Corrosion)

Principles of method if other than guideline:

The test compound Aluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex (CAS No: 15790-07-5) was tested for its dermal irritation potential in New Zealand White Rabbits according to OECD guideline 404 Guidelines

GLP compliance:

no

Specific details on test material used for the study:

- Name of test material (IUPAC name): aluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex
- Molecular formula: C16H9AlN2O7S2
- Molecular weight: 432.368 g/mol
- Smiles notation: c12c(cc(S(=O)(=O)[O-])cc2)ccc(c1\N=N\c1ccc(S(=O)(=O)[O-])cc1)[O-].[Al+3]
- InChl: 1S/C16H12N2O7S2.Al/c19-15-8-1-10-9-13(27(23,24)25)6-7-14(10)16(15)18-17-11-2-4-12(5-3-11)26(20,21)22;/h1-9,19H,(H,20,21,22)(H,23,24,25);/q;+3/p-3/b18-17+;
- Substance type: Organic
- Physical state: Solid

Species:

rabbit

Strain:

New Zealand White

Details on test animals or test system and environmental conditions:

Details on test animals
Age: 10 to 12 weeks
Sex:Female
Body weight range: 2.0kg±200g
Identification : By cage tag and corresponding colour body marking
Housing:Animals were housed individually in stainless steel cages provided with stainless steel mesh bottom and facilities for food and water bottle.
Diet:Pelleted feed supplied by Pranav agro Industries Ltd., B7/6 Ramesh Nagar, Delhi
Water:Community tap water passed through ‘Aqua Guard on line water filter’, was kept in glass bottles, ad libitum
Acclimatization: The healthy rabbits selected for study was acclimatized to standard laboratory condition for one week in experimental room under Veterinary examination.
Randomization: After acclimatization and Veterinary examination three females were randomly selected.

Details on environmental conditions:
- Temperature (°C): temperature between 22-25 deg C
- Humidity (%): relative humidity 40-60%
- Air changes (per hr): Air conditioned rooms with 10-15 air changes per hour,
- Photoperiod (hrs dark / hrs light): illumination cycle set to 12 hours artificial fluorescent light and 12 hours dark.

HUSBANDRY
Environmental conditions :Air conditioned rooms with 10-15 air changes per hour, temperature between 19-25 0C, relative humidity 30-60% and illumination cycle set to 12 hours artificial fluorescent light and 12 hours dark.
Accommodation Animals were housed individually in stainless steel cages provided with stainless steel mesh bottom and facilities for food and water bottle.
Diet : Pelleted feed supplied by Pranav agro Industries Ltd., B7/6 Ramesh Nagar, Delhi, India
Water : Community tap water passed through ‘Aqua Guard on line water filter’, was kept in glass bottles,mad-libitum

Type of coverage:

occlusive

Preparation of test site:

clipped

Remarks:

intact skin

Vehicle:

unchanged (no vehicle)

Controls:

not specified

Amount / concentration applied:

500 mg (0.5g)

Duration of treatment / exposure:

4 hours

Observation period:

60 min., 24, 48 and 72 hours after application.

Number of animals:

3 female rabbits

Details on study design:

TEST SITE
- Area of exposure: dorsal area of trunk
- % coverage: small area (approximately 6 cm2)
- Type of wrap if used: impervious dressing which was secured in position with adhesive tape

REMOVAL OF TEST SUBSTANCE
- Washing (if done): yes
- Time after start of exposure:after patch removal the test site was washed with lukewarm water

OBSERVATION TIME POINTS
(indicate if minutes, hours or days) : The intact skin site of application of each animal was observed for signs of erythema and oedema at 60 min., 24, 48 and 72 hours after application.

SCORING SYSTEM:
- Method of calculation:The intact skin site of application of each animal was observed for signs of erythema and oedema and the responses were scored following Draize’s method

Other effects / acceptance of results:

no data available

Irritation parameter:

primary dermal irritation index (PDII)

Basis:

mean

Time point:

14 d

Score:

0

Reversibility:

not specified

Remarks on result:

no indication of irritation

Irritant / corrosive response data:

The test compound applied at the dose level of 500mg on shaven back skin of rabbit did not produced any irritation to skin during period of observation.

Other effects:

The test compound applied on the shaven back skin of rabbit did not produce pain and any clinical signs of toxicity throughout the examination period of 14 days.

TABLE - 1

INDIVIDUAL ANIMAL DERMAL IRRITATION SCORES

Rabbit No.	Sex	INTACT SKIN
		3 Min.		4 Hours		24 Hours		48 Hours		72 Hours		14 days
		Erythema	Oedema	Erythema	Oedema	Erythema	Oedema	Erythema	Oedema	Erythema	Oedema	Erythema	Oedema
01	F	0	0	0	0	0	0	0	0	0	0	0	0
02	F	-	-	0	0	0	0	0	0	0	0	0	0
03	F	-	-	0	0	0	0	0	0	0	0	0	0
Total		0	0	0	0	0	0	0	0	0	0	0	0
Mean		0	0	0	0	0	0	0	0	0	0	0	0
Grand Total		0.00

Dermal Irritation Index: 0.0/4 = 0.0

Interpretation of results:

other: not irritating

Conclusions:

The Primary Irritation Index (PII) for aluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex {CAS No: 15790-07-5} after 14 days of observation was 0.0.
Also aluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex {CAS No: 15790-07-5} did not produce pain and any clinical signs of toxicity throughout the examination period of 14 days.
Hence, under the test conditions, aluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex {CAS No: 15790-07-5} can be concluded to be not irritating to New Zealand White rabbit skin.

Executive summary:

A dermal irritation study was conducted on New Zealand white rabbits in accordance with OECD 404 to assess the irritation parameter ofaluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex {CAS No: 15790-07-5} 3 female New Zealand White rabbits were used for the study. The animals were prepared 24 hours prior to application of test product. The furs from the dorsal area of trunk of animals were removed with electric clippers exposing an area measuring approximately 6 cm2 of body surface area of animal. The care was taken such that abrasion penetrated the Stratum corneum only and not dermis. 500gm (0.5g) of test compound was applied on a small area (approximately 6 cm2) of intact skin site. Each site of application was covered with impervious dressing which was secured in position with adhesive tape. The intact skin site of application of each animal was observed for signs of erythema and oedema at 60 min., 24, 48 and 72 hours after application and the responses were scored according to Draize method.

The Primary Irritation Index (PII) foraluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex {CAS No: 15790-07-5}after 14 days of observation was 0.0.Alsoaluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex {CAS No: 15790-07-5}did not produce pain and any clinical signs of toxicity throughout the examination period of 14 days.

Hence, under the test conditions,aluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex {CAS No: 15790-07-5}can be concluded to be not irritating to New Zealand White rabbit skin.

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:

experimental study

Adequacy of study:

weight of evidence

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Justification for type of information:

data is from experimental reports

Qualifier:

according to guideline

Guideline:

OECD Guideline 405 (Acute Eye Irritation / Corrosion)

Principles of method if other than guideline:

The acute eye irritation study of Aluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex (CAS No: 15790-07-5) was conducted in New Zealand White Rabbits as per the OECD- 405 Guideline

GLP compliance:

no

Specific details on test material used for the study:

- Name of test material (IUPAC name): aluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex
- Molecular formula: C16H9AlN2O7S2
- Molecular weight: 432.368 g/mol
- Smiles notation: c12c(cc(S(=O)(=O)[O-])cc2)ccc(c1\N=N\c1ccc(S(=O)(=O)[O-])cc1)[O-].[Al+3]
- InChl: 1S/C16H12N2O7S2.Al/c19-15-8-1-10-9-13(27(23,24)25)6-7-14(10)16(15)18-17-11-2-4-12(5-3-11)26(20,21)22;/h1-9,19H,(H,20,21,22)(H,23,24,25);/q;+3/p-3/b18-17+;
- Substance type: Organic
- Physical state: Solid

Species:

rabbit

Strain:

New Zealand White

Details on test animals or tissues and environmental conditions:

Details on test animals:
- Age: 10 to 12 weeks
- Sex: Female
- Body weight range: 2.0kg ±200g
- Housing: Rabbit was housed in stainless steel cages provided with stainless steel mesh bottom and facilities for food and water bottle.
- Diet:Pelleted feed supplied by Pranav agro Industries Ltd., B7/6 Ramesh Nagar, Delhi, India
- Water:Community tap water passed through ‘Aqua Guard on line water filter’ was kept in bottles, ad libitum.
- Acclimatization: The rabbit was acclimatized to standard laboratory condition for 24 hours in experimental room before study.

ENVIRONMENTAL CONDITIONS
- Temperature:temperature between 22-250C
- Humidity (%):relative humidity 40-60%
- Air changes (per hr):Air conditioned room with 10-15 air changes per hour
- Photoperiod (hrs dark / hrs light):illumination cycle set to 12 hours artificial fluorescent light and 12 hours dark.


HUSBANDRY
Environmental conditions :Air conditioned rooms with 10-15 air changes per hour, temperature between 19-25 0C, relative humidity 30-60% and illumination cycle set to 12 hours artificial fluorescent light and 12 hours dark.
Accommodation Animals were housed individually in stainless steel cages provided with stainless steel mesh bottom and facilities for food and water bottle.
Diet : Pelleted feed supplied by Pranav agro Industries Ltd., B7/6 Ramesh Nagar, Delhi, India
Water : Community tap water passed through ‘Aqua Guard on line water filter’, was kept in glass bottles,mad-libitum

Vehicle:

unchanged (no vehicle)

Controls:

yes

Amount / concentration applied:

100mg (0.1g)

Duration of treatment / exposure:

24 hours

Observation period (in vivo):

The eyes were examined at 1, 24, 48 and 72 hours after test substance application

Duration of post- treatment incubation (in vitro):

no data available

Number of animals or in vitro replicates:

3 female rabbits

Details on study design:

REMOVAL OF TEST SUBSTANCE
- Washing (if done): not washed
SCORING SYSTEM:Scale of weighted scores for grading the severity of ocular lesions developed by Draize et al
TOOL USED TO ASSESS SCORE: hand-slit lamp / biomicroscope / fluorescein: hand-slit lamp
Examination of reactions was facilitated by use of biomicroscope and hand slit lamp. After recording the observations at 24 hours, the eyes were further examined with the aid of fluorescein.

Other effects / acceptance of results:

no data available

Irritation parameter:

overall irritation score

Basis:

mean

Time point:

72 h

Score:

0

Reversibility:

not specified

Remarks on result:

no indication of irritation

Irritant / corrosive response data:

The test compound when applied to the eye of New Zealand white rabbit at the dose level of 0.1gm did not produce any lesions such as pannus, staining throughout the observation period of 72 hours.

Other effects:

The test compound applied in conjunctival sac of rabbits did not show any observable clinical signs of eye irritation throughout the observation period of 21 days.

TABLE- 1     GRADING OF OCULAR LESIONS

 

S.NO/ SEX		OBSERVATION	Score				Total	Total Score
1/F			1 hr	24hrs	48 hrs	72 hrs
	Cornea	A.       Opacity-Degree of Density	0	0	0	0	0	0×0×5=0
		B.       Area of Cornea Involved	0	0	0	0	0
	Iris	A.       Values	0	0	0	0	0	0
	Conjunctivae	A.       Redness	1	0	0	0	1	0+0+0×5=5
		B.       Chemosis	0	0	0	0	0
		C.       Discharge	0	0	0	0	0
2/F	Cornea	A.       Opacity-Degree of Density	0	0	0	0	0	0×0×5=0
		B.       Area of Cornea Involved	0	0	0	0	0
	Iris	A.       Values	0	0	0	0	0	0
	Conjunctivae	A.       Redness	1	0	0	0	1	0+0+0×5=5
		B.       Chemosis	0	0	0	0	0
		C.       Discharge	0	0	0	0	0
3/F	Cornea	A.       Opacity-Degree of Density	0	0	0	0	0	0×0×5=0
		B.       Area of Cornea Involved	0	0	0	0	0
	Iris	A.       Values	0	0	0	0	0	0
	Conjunctivae	A.       Redness	1	0	0	0	1	0+0+0×5=5
		B.       Chemosis	0	0	0	0	0
		C.       Discharge	0	0	0	0	0
Grand total								0.00
Mean								0.00
Eye Irritation Scoring index								0.00

Interpretation of results:

other: not irritating

Conclusions:

The overall irritation index of aluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex (CAS No: 15790-07-5) was 0.0 after 72 hours. Also aluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex (CAS No: 15790-07-5) did not produce any clinical signs of toxicity throughout the examination period of 21 days.
Hence, under the test conditions, aluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex (CAS No: 15790-07-5)can be concluded to be not irritating to New Zealand White rabbit eyes.

Executive summary:

An ocular irritation study was conducted on New Zealand white rabbits in accordance with OECD 405 to assess the irritation parameter of aluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex (CAS No: 15790-07-5) 3 female New Zealand White rabbits were used for the study. 0.1g of the undiluted test chemical was instilled in the conjunctival sac of rabbits after gently pulling the lower lid away from the eyeball. The other eye which remained untreated served as a control. The ocular lesions were evaluated at 1, 24, 48 and 72 hours after the treatment. The grades of ocular reactions (conjunctiva, cornea and iris) were recorded at each observation. To determine the reversibility of the effect the animals were observed normally for 21 days. Any other lesions in the eye viz pannus, staining were observed and scored accordingly. Examination of reactions was facilitated by use of biomicroscope and hand slit lamp. Individual animal weights before and during the study was observed.

The overall irritation index of aluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex (CAS No: 15790-07-5) was 0.0 after 72 hours.

Also aluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex (CAS No: 15790-07-5) did not produce any clinical signs of toxicity throughout the examination period of 21 days.

Hence, under the test conditions, aluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex (CAS No: 15790-07-5)can be concluded  to be not irritating to New Zealand White rabbit eyes.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not irritating)

Respiratory irritation

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information

Skin irritation:

Various studieshas been investigated for the test chemical2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt (CAS No: 93941-74-3)   to observe the potential for dermal irritation to a greater or lesser extent. The studies are based on in vivo experiments in rabbits and rats for target chemical2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt (CAS No: 93941-74-3)   and its structurally similar read across substancesTetra sodium 1-acetamido-2-hydroxy-3-(4-((4-sulphonatophenylazo)-7-sulphonato-1-naphthylazo))naphthalene-4,6-disulphonate[CAS:2519 -30 -4]andaluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex {CAS No: 15790-07-5} .The predicted data using the OECD QSAR toolbox andDanish QSAR databasehas also been compared with the experimental data and summarized as below;

 

In a prediction done by SSS (2017) using the OECD QSAR toolbox with log kow as the primary descriptor, the skin irritation potential was estimated for test chemical2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt (CAS No: 93941-74-3) . The chemical 2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt (CAS No: 93941-74-3)   is estimated to be not irritating to skin of New Zealand White rabbits.

 

According to Danish QSAR database , the skin irritation effects were estimated by using four different models i.e, Battery, Leadscope, SciQSAR and CASE Ultra for 2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt (CAS No: 93941-74-3) . Based on estimation, no skin irritation reactions were observed in rabbits. Therefore, 2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt (CAS No: 93941-74-3)  was considered to be not irritating.

 

A study was designed and conducted by Sustainability Support Services (Europe) AB, 2017 to determine the dermal reaction profile of read across substance Tetra sodium 1-acetamido-2-hydroxy-3-(4-((4-sulphonatophenylazo)-7-sulphonato-1-naphthylazo))naphthalene-4,6-disulphonate[CAS:2519 -30 -4] 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 test item Tetra sodium 1-acetamido-2-hydroxy-3-(4-((4-sulphonatophenylazo)-7-sulphonato-1-naphthylazo))naphthalene-4,6-disulphonate 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. 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.  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 Tetra sodium 1-acetamido-2-hydroxy-3-(4-((4-sulphonatophenylazo)-7-sulphonato-1-naphthylazo))naphthalene-4,6-disulphonate was Non-Irritating to the skin of Sprague Dawley rats under the experimental conditions tested.

 

The above results were further supported by another dermal irritation study conducted by Sustainability Support Services (Europe) AB, 2017 on three New Zealand white rabbits in accordance with OECD 404 to assess the irritation parameter of read across chemical aluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex {CAS No: 15790-07-5} that supported the above mentioned results. The animals were prepared 24 hours prior to application of test product. The furs from the dorsal area of trunk of animals were removed with electric clippers exposing an area measuring approximately 6 cm2 of body surface area of animal. The care was taken such that abrasion penetrated the Stratum corneum only and not dermis. 500gm (0.5g) of test compound was applied on a small area (approximately 6 cm2) of intact skin site. Each site of application was covered with impervious dressing which was secured in position with adhesive tape. The intact skin site of application of each animal was observed for signs of erythema and oedema at 60 min., 24, 48 and 72 hours after application and the responses were scored according to Draize method. The Primary Irritation Index (PII) foraluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex {CAS No: 15790-07-5}after 14 days of observation was 0.0.Alsoaluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex {CAS No: 15790-07-5}Bdid not produce pain and any clinical signs of toxicity throughout the examination period of 14 days. Hence, under the test conditions, aluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex {CAS No: 15790-07-5}can be concluded to be not irritating to New Zealand White rabbit skin.

 

Based on the available data for the target and read across substances and applying the weight of evidence approach, it can be concluded that chemical 2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt (CAS No: 93941-74-3)  is unable to cause skin irritation and considered as not irritating. Comparing the above annotations with the criteria of CLP regulation, it can be classified under the category “Not Classified”.

 

Eye irritation:

In different studies,the test chemical2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt (CAS No: 93941-74-3)   has been investigated for potential for ocular irritationto a greater or lesser extent. The studies are based on in vivo experiments in rabbits for target chemical2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt (CAS No: 93941-74-3)   andits structurally similar read across substancealuminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex (CAS No: 15790-07-5) andfunctionally similar read across substancesDisodium 3-[(2,4-dimethyl-5-sulphonatophenyl)azo]-4-hydroxynaphthalene-1-sulphonate [CAS: 4548-53-2] and 1,3 -Naphthalenedisulfonic acid, 7-hydroxy-8-((4-sulfo-1-naphthalenyl)azo)-, trisodium salt (Acid Red 18) [2611-82-7].The predicted data using the OECD QSAR toolbox has also been compared with the experimental data and summarized as below;

 

In a prediction done by SSS (2017) using the OECD QSAR toolbox with log kow as the primary descriptor, the eye irritation potential was estimated for test chemical2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt (CAS No: 93941-74-3) . The chemical 2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt (CAS No: 93941-74-3)   is estimated to be not irritating to eye of New Zealand White rabbits.

 

An ocular irritation study was conducted by Sustainability Support Services (Europe) AB, 2017 on three New Zealand white rabbits in accordance with OECD 405 to assess the irritation parameter of read across chemical aluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex (CAS No: 15790-07-5). About 0.1g of the undiluted test chemical was instilled in the conjunctival sac of rabbits after gently pulling the lower lid away from the eyeball. The other eye which remained untreated served as a control. The ocular lesions were evaluated at 1, 24, 48 and 72 hours after the treatment. The grades of ocular reactions (conjunctiva, cornea and iris) were recorded at each observation. To determine the reversibility of the effect the animals were observed normally for 21 days. Any other lesions in the eye viz pannus, staining were observed and scored accordingly. Examination of reactions was facilitated by use of biomicroscope and hand slit lamp. Individual animal weights before and during the study was observed. The overall irritation index of aluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex (CAS No: 15790-07-5) was 0.0 after 72 hours. Also aluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex (CAS No: 15790-07-5) did not produce any clinical signs of toxicity throughout the examination period of 21 days. Hence, under the test conditions, aluminium, 6-hydroxy-5-[(4-sulfophenyl)azo]-2-naphthalenesulfonic acid complex (CAS No: 15790-07-5)can be concluded  to be not irritating to New Zealand White rabbit eyes.

 

These results were supported by the experimental study summarized in Scientific Committee on Cosmetology (seventh series), 1988; for the structurally similar read across substance, Disodium 3-[(2,4-dimethyl-5-sulphonatophenyl)azo]-4-hydroxynaphthalene-1-sulphonate [CAS: 4548-53-2]. Ponceau SX 5% in formulation was instilled into the eyes of rabbits and observed for signs of irritation (duration not mentioned). Ponceau SX 5% in formulation did not cause any irritation to rabbit eyes. Hence, Ponceau SX can be considered not irritating to rabbit eyes.

 

The above results were further supported by the experimental study summarized in THE SCIENTIFIC COMMITTEE ON COSMETIC PRODUCTS AND NON-FOOD PRODUCTS (SCCNFP), last updated 23 April 2004; for the structurally similar read across substance, 1,3 -Naphthalenedisulfonic acid, 7-hydroxy-8-((4-sulfo-1-naphthalenyl)azo)-, trisodium salt (Acid Red 18) [2611-82-7]. The ocular irritation was assessed by determining the Cytotoxicity in the neutral red uptake assay (NRU) on human keratinocytes with the modification that human keratinocytes of the HaCaT cell line were used. The treatment was performed in serum-free culture medium. Doses from 681 – 10000 μg/ml [1% in water] were applied together with appropriate controls. Two independent NRU assays with identical doses were performed. No NRU-50 value could be determined from the cytotoxicity curves as the viability was still 61% in the first assay and 70% in the second, so the NRU-50 was reported to be > 10000 μg/ml. Hence, Acid red 18 can be considered not irritating to Human Keratinocytes in the neutral red uptake assay.

 

 

Based on the available data for the target and read across substances and applying the weight of evidence approach, it can be concluded that chemical 2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt (CAS No: 93941-74-3)  is unable to cause eye irritation and considered as not irritating. Comparing the above annotations with the criteria of CLP regulation, it can be classified under the category “Not Classified”.

Justification for classification or non-classification

The skin and eye irritation potential of test chemical 2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt (CAS No: 93941-74-3)   and its structurally and functionally similar read across substanceswere observed in various studies. The results obtained from these studies indicate that the chemical 2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt (CAS No: 93941-74-3)  is unlikely to cause skin and eye irritation. Hence 2-[[4-[[4-[[6-anilino-1-hydroxy-3-sulpho-2-naphthyl]azo]-1-naphthyl]azo]-6-sulpho-1-naphthyl]azo]benzene-1,4-disulphonic acid, magnesium sodium salt (CAS No: 93941-74-3)   can be classified under the category “Not Classified” for skin and eye as per CLP.