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

Skin sensitisation

Administrative data

Endpoint:

skin sensitisation: in vivo (LLNA)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

January - March 2008

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2008

Report date:

2008

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 429 (Skin Sensitisation: Local Lymph Node Assay)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of study:

mouse local lymph node assay (LLNA)

Test material

Test material information

Constituent 1

Reference substance name:

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

EC Number:

226-109-5

EC Name:

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

Cas Number:

5281-04-9

Molecular formula:

C18H14N2O6S.Ca

IUPAC Name:

calcium 3-hydroxy-4-[(1E)-2-(4-methyl-2-sulfonatophenyl)diazen-1-yl]naphthalene-2-carboxylate

Test material form:

solid: nanoform

Details on test material:

- Name of test material (as cited in study report): Graphtol-Rubine 6BP
- Substance type: pigment
- Physical state: red solid
- Expiration date of the lot/batch: October 31, 2017
- Stability under test conditions: stable
- Storage condition of test material: room temperature
- Other: stability > 72 hours in DMSO and 1,2 - propylene glycol at room temperature
- Analytical purity: 84.34/ (w/w)
- Composition: 7.73 % Pigment Red 63:1
- Lot/batch No.: KRON 792014

Test materials used in this dossier are all considered to fall under the definition of nano-materials according to the European Commission Recommendation 2011/696/EU as the synthesis and manufacturing of this pigment always yields particulate material with a fine particle size distribution.

Specific details on test material used for the study:

- Name of test material (as cited in study report): Graphtol-Rubine 6BP
- Substance type: pigment
- Physical state: red solid
- Expiration date of the lot/batch: October 31, 2017
- Stability under test conditions: stable
- Storage condition of test material: room temperature
- Other: stability > 72 hours in DMSO and 1,2 - propylene glycol at room temperature
- Analytical purity: 84.34/ (w/w)
- Composition: 7.73 % Pigment Red 63:1
- Lot/batch No.: KRON 792014

In vivo test system

Test animals

Species:

mouse

Strain:

CBA

Sex:

female

Details on test animals and environmental conditions:

TEST ANIMALS
- Source: Harlan Netherlands
- Age at study initiation: 8 - 10 weeks
- Housing: single caging
- Diet (e.g. ad libitum): pelleted standard diet, ad libitum
- Water (e.g. ad libitum): ad libitum
- Acclimation period: 5 days


ENVIRONMENTAL CONDITIONS
- Temperature (°C): 22 + 3°C
- Humidity (%): 30-70%
- Photoperiod (hrs dark / hrs light): 12h/12h

Study design: in vivo (LLNA)

Vehicle:

dimethyl sulphoxide

Concentration:

2.5, 5, and 10 %

No. of animals per dose:

4

Details on study design:

For determination of the highest non-irritant and technically applicable test item concentration, a non-GLP pretest was performed on two mice with concentrations of 1.25, 2.5, 5, and 10 % (w/v). The top dose of the test item is the highest technically achievable concentration whilst avoiding systemic toxicity and excessive local irritation. Four female mice were treated with different concentrations of the test item and vehicle alone by topical application at the dorsum of each ear lobe (left and right) on three consecutive days. Five days after the first topical application, the mice were intravenously injected into a tail vein with radio-labelled thymidine (3H-methyl thymidine). Five hours after intravenous injection, the mice were sacrificed and the draining auricular lymph nodes excised and pooled per group. Single cell suspensions of lymph node cells were prepared from pooled lymph nodes which were subsequently washed and incubated with trichloroacetic acid overnight. The proliferative capacity of pooled lymph node cells was determined by the incorporation of 3H-methyl thymidine measured in a ß-scintillation counter.

Positive control substance(s):

hexyl cinnamic aldehyde (CAS No 101-86-0)

Results and discussion

Positive control results:

Performed in October 2007: 25% in acetone/olive oil (4+1) gave an SI of 6.32 and 10% gave an SI of 3.03.

In vivo (LLNA)

Results

Results 1

Parameter:

SI

Value:

2

Test group / Remarks:

25%

Results 2

Parameter:

SI

Value:

2.06

Test group / Remarks:

10%

Results 3

Parameter:

SI

Value:

1.68

Test group / Remarks:

5%

Results 4

Parameter:

SI

Value:

1

Test group / Remarks:

vehicle

Any other information on results incl. tables

Disintegrations per minute

DPM minus background control: 10594 (25%) 10939 (10%) 8907 (5%) 5298 (vehicle control)

Other information

No deaths occurred during the study period. Due to the intense red colour of the test item local irritation reactions such as ear redness could not be detected.

The body weights of the animals, recorded prior to the 1st application and prior to necropsy was within the range commonly recorded for animals of this strain and age.

Applicant's summary and conclusion

Interpretation of results:

GHS criteria not met