Tetrasodium 7-[[4-[[4,6-bis[(3-sulfonatopropyl)thio]-1,3,5-triazin-2-yl]amino]-3-methoxyphenyl]azo]naphthalene-1,3-disulfonate

Skin sensitisation

Administrative data

Endpoint:

skin sensitisation: in vivo (non-LLNA)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

19 June 1998 - 13 July 1998

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

Remarks:

Study conducted in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of the relevant results. The study report was conclusive, performed in accordance with valid guidelines and the study was conducted under GLP conditions.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1998

Report date:

1998

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

OECD Guideline 406 (Skin Sensitisation)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

EU Method B.6 (Skin Sensitisation)

Deviations:

no

GLP compliance:

yes

Type of study:

guinea pig maximisation test

Test material

Test material information

Constituent 1

Reference substance name:

Tetrasodium 7-[[4-[[4,6-bis[(3-sulfonatopropyl)thio]-1,3,5-triazin-2-yl]amino]-3-methoxyphenyl]azo]naphthalene-1,3-disulfonate

EC Number:

428-480-0

EC Name:

Tetrasodium 7-[[4-[[4,6-bis[(3-sulfonatopropyl)thio]-1,3,5-triazin-2-yl]amino]-3-methoxyphenyl]azo]naphthalene-1,3-disulfonate

Cas Number:

214559-61-2

Molecular formula:

C26H24N6O13S6Na4

IUPAC Name:

tetrasodium 7-[[4-[[4,6-bis[(3-sulfonatopropyl)thio]-1,3,5-triazin-2-yl]amino]-3-methoxyphenyl]azo]naphthalene-1,3-disulfonate

Test material form:

solid: particulate/powder

Remarks:

migrated information: powder

Details on test material:

- Physical state: solid
- Appearance: orange granulous powder
- Storage condition of test material: at room temperature and protected from light

In vivo test system

Test animals

Species:

guinea pig

Strain:

Dunkin-Hartley

Sex:

male/female

Details on test animals and environmental conditions:

TEST ANIMALS
- Age at study initiation: approximately 3 months
- Weight at study initiation (mean ± standard deviation): 362 ± 17 g (males); 362 ± 18 g (females)
- Housing: individually in polycarbonate cages (48 x 27 x 20 cm)
- Diet: ad libitum
- Water: ad libitum
- Acclimation period: at least 5 days

ENVIRONMENTAL CONDITIONS
- Temperature (°C): 21 ± 2 °C
- Humidity (%): 30 - 70 %
- Photoperiod (hrs dark / hrs light): 12 hours dark / 12 hours light

IN-LIFE DATES: From: 19 June 1998 To: 13 July 1998

Study design: in vivo (non-LLNA)

Induction

Induction 1

Route:

intradermal and epicutaneous

Vehicle:

other: isotonic saline solution (0.9 % NaCl)

Induction 2

Concentration / amount:

INDUCTION
Test group:
- intradermal: Anterior: Freud's Complete Adjuvant (FCA) diluted at 50 % with (v/v) with sterile isotonic saline solution (0.9 % NaCl)
Middle: 20 % (w/w) test substance in sterile isotonic saline solution (0.9 % NaCl)
Posterior: 20 % (w/w) test substance in a mixture of FCA and sterile isotonic saline solution (0.9 % NaCl) 50/50 (v/v)
- topical: applied unchanged (no vehicle)

Control group:
- intradermal: Anterior: Freud's Complete Adjuvant (FCA) diluted at 50 % with (v/v) with sterile isotonic saline solution (0.9 % NaCl)
Middle: vehicle
Posterior: 50 % (w/w) vehicle in a mixture of FCA and sterile isotonic saline solution (0.9 % NaCl) 50/50 (v/v)
- topical: applied unchanged (no vehicle)

CHALLENGE:
- topical: 10 % (w/w) test substance in sterile isotonic saline solution (0.9 % NaCl) for both test and control groups.

Challenge

Challenge 1

Route:

epicutaneous, occlusive

Vehicle:

other: isotonic saline solution (0.9 % NaCl)

Challenge 2

Concentration / amount:

INDUCTION
Test group:
- intradermal: Anterior: Freud's Complete Adjuvant (FCA) diluted at 50 % with (v/v) with sterile isotonic saline solution (0.9 % NaCl)
Middle: 20 % (w/w) test substance in sterile isotonic saline solution (0.9 % NaCl)
Posterior: 20 % (w/w) test substance in a mixture of FCA and sterile isotonic saline solution (0.9 % NaCl) 50/50 (v/v)
- topical: applied unchanged (no vehicle)

Control group:
- intradermal: Anterior: Freud's Complete Adjuvant (FCA) diluted at 50 % with (v/v) with sterile isotonic saline solution (0.9 % NaCl)
Middle: vehicle
Posterior: 50 % (w/w) vehicle in a mixture of FCA and sterile isotonic saline solution (0.9 % NaCl) 50/50 (v/v)
- topical: applied unchanged (no vehicle)

CHALLENGE:
- topical: 10 % (w/w) test substance in sterile isotonic saline solution (0.9 % NaCl) for both test and control groups.

No. of animals per dose:

2 males and 2 females (preliminary test)
5 males and 5 females (control group)
10 males and 10 females (treatment group)

Details on study design:

RANGE FINDING TESTS
A preliminary study was conducted to inform on test concentrations to be used in the main study. The maximal practicable concentration by both the intradermal, and cutaneous route, was 20 % and this was selected for the main study.

MAIN STUDY
On day 1, the dorsal region between the shoulders, was clipped free of fur and intradermal injections of Freund's complete adjuvant mixed with 0.1 mL test material (treatment group) or the vehicle (control group) were prepared and injected. On day 7, the same region received a topical application of 0.5 mL sodium laurylsulphate in vaseline (10 % w/w) in order to induce local irritation.

On day 8, the same test site was treated by topical application of 500 mg of unchanged test material (treatment group) or 0.5 mL vehicle (control group) and was covered by an occlusive dressing, covering 4 cm x 2 cm, for 48 hours. Cutaneous reactions were recorded 1 hour after removal of the occlusive dressing.

After a rest period of 12 days, all animals of the treatment and control groups were challenged by a topical application of the 10 % w/w test material on the right flank. The left flank served as the control and received 0.5 mL vehicle only. Test material and vehicle were maintained under an occlusive dressing for 24 hours. Skin reactions were evaluated approximately 24 and 48 hours later according to the scale outlined in the field "Any other information on materials and methods incl. tables".

The animals were observed twice a day during the study in order to check for clinical signs and mortality. The animals were weighed individually on the day of allocation into the groups, on the first day of the study and again on test days 8, 15 and 25.

At the end of the study, animals were killed. No necropsy was performed and no skin samples were taken from the challenge application sites. No histological examination was performed.

Positive control substance(s):

yes

Remarks:

2,4-dinitro-1-chlorobenzene and mercaptobenzothiazole

Results and discussion

In vivo (non-LLNA)

Results

Results 1

Reading:

1st reading

Hours after challenge:

24

Group:

test chemical

Dose level:

10 %

No. with + reactions:

0

Total no. in group:

20

Remarks on result:

other: Reading: 1st reading. . Hours after challenge: 24.0. Group: test group. Dose level: 10 %. No with. + reactions: 0.0. Total no. in groups: 20.0.

Results 2

Reading:

2nd reading

Hours after challenge:

48

Group:

test chemical

Dose level:

10 %

No. with + reactions:

0

Total no. in group:

20

Remarks on result:

other: Reading: 2nd reading. . Hours after challenge: 48.0. Group: test group. Dose level: 10 %. No with. + reactions: 0.0. Total no. in groups: 20.0.

Results 3

Reading:

1st reading

Hours after challenge:

24

Group:

negative control

Dose level:

10 %

No. with + reactions:

0

Total no. in group:

10

Remarks on result:

other: Reading: 1st reading. . Hours after challenge: 24.0. Group: negative control. Dose level: 10 %. No with. + reactions: 0.0. Total no. in groups: 10.0.

Results 4

Reading:

2nd reading

Hours after challenge:

48

Group:

negative control

Dose level:

10 %

No. with + reactions:

0

Total no. in group:

10

Remarks on result:

other: Reading: 2nd reading. . Hours after challenge: 48.0. Group: negative control. Dose level: 10 %. No with. + reactions: 0.0. Total no. in groups: 10.0.

Any other information on results incl. tables

Clinical examionations - No clinical signs were observed during the study.

-The body weight gain of the treated animals was normal when compared to the controls.

Scoring cutaneous reactions

- On day 10, after the cutaneous application of the induction period, signs of irritation were observed at the interscapular test site in the control group. For the treated group, scoring was masked by the colouration of the skin.

- No cutaneous reactions were observed after the challenge application although an orange colouration of the skin, which could have masked a very slight erythema (grade 1), was noted at the 24 hour reading in almost all the animals.

Applicant's summary and conclusion

Interpretation of results:

not sensitising

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

Under the conditions of the study, no cutaneous reactions, which could be attributable to the sensitisation potential of the test material, were observed. The study is considered to be reliable, relevant and adequate for risk assessment and classification and labelling purposes.

Executive summary:

The skin sensitisation potential of the test material was determined in accordance with standardised guidelines OECD 406 and EU Method B.6 using the Guinea-pig Maximisation Test. The test material was dosed as a 20 % w/w preparation in isotonic saline solution in an intradermal and unchanged in a topical induction phase. The test material was dosed as a 10 % w/w preparation in isotonic saline solution during a challenge application. The positive controls were shown to have the capacity to cause skin sensitisation confirming the validity of the protocol used for this study. Under the conditions of the study, no cutaneous reactions, which could be attributable to the sensitisation potential of the test material, were observed.