Low chlorinated copper, [29H,31Hphthalocyaninato(2-)-N29,N30,N31,N32]-, wherein the number of chlorines is more than or equal to 0 and less than or equal to 7

Endpoint summary

Description of key information

The substance was found to be non sensistizing in a GLP and OECD guideline 429 compliant study. The substance was tested as a formulation in sesame oil. The highest tested doses were the technically achievable ones. The substance is an insoluble solid that needs to be formed into a paste for application.

Key value for chemical safety assessment

Skin sensitisation

Link to relevant study records

Reference

Endpoint:

skin sensitisation: in vivo (LLNA)

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

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)

Specific details on test material used for the study:

- Substance type: blue solid
- Analytical purity: no data given
- Lot/batch No.: KRON 200106
- Purity> 85%
- Expiration date of the lot/batch: 31-Mar-2006
- Stability under test conditions: stable under storage conditions
- Storage condition of test material: in the original container at room temperature (20 °C +- 3 °C), away from direct sunlight

Species:

mouse

Strain:

CBA

Sex:

female

Details on test animals and environmental conditions:

TEST ANIMALS
- Source: Harlan Netherlands
- Age at study initiation: 8 - 12 weeks
- Weight at study initiation: 16 g - 24 g (ordered)
- Housing: individually in Makrolon type-2 cages with standard softwood bedding
- Diet: Pelleted Standard Kliba 3433, batch no. 78/03 mouse maintainance diet (Provimi Kliba AG, Kaiseraugst, Switzerland), ad libitum
- Water: tap water, ad libitum
- Acclimation period: under test conditions after haelth examination; only animals without any visible signs of illness were used for the study

ENVIRONMENTAL CONDITIONS
- Temperature: 22 +- 3 °C
- Humidity: 30 - 70 %
- Air changes per hr: 10 - 15
- Photoperiod: 12 hrs dark / 12 hrs light

Vehicle:

dimethyl sulphoxide

Concentration:

2.5, 5 and 10 %

No. of animals per dose:

4 animals per dose

Details on study design:

RANGE FINDING TESTS:
To determine the highest non-irritant and technically applicable test item concentration, a non-GLP test was conducted in 2 mice with concentrations of 1, 2.5, 5 and 10 %. In the main study 3 consecutive concentrations were assayed. The top dose was the highest achievable concentration whilst avoiding systemic toxicity and excessive local irritation. No severe irritant effects were tolerated choosing the test concentrations.

MAIN STUDY:
Each test group was treated by topical application to the dorsal surface of each ear lobe (left and right) with different test item concentrations. The application volume, 25 µl, was spread over the entire dorsal surface (ca. 8 mm diameter) of each ear lobe once daily for 3 consecutive days. A further group of mice was treated with an equivalent volume of the relevant vehicle alone (control animals). A hair dryer was passed briefly over the ear´s surface to prevent the loss of any of the test item applied.
Five days after the first topical application, all mice were administered with 250 µl of 79.6 µCi/ml 3HTdR (equal to 19.9 µCi 3HTdR) by intravenous injection via a tailvein.
Approx. 5 h after treatment with 3HTdR all mice were euthanized with dry ice (CO2). The draining lymph nodes were rapidly excised and pooled for each experimental group (8nodes/group). Single cell suspensions of pooled lymph node cells were prepared. Cells were resuspended in 5 % trichloroacetic acid ans incubated at 4 °C for at least 18 h to precipitate the macromolecules. The precipitates were resuspended in 5 % trichloroacetic acid and transferred to glass scintillation vialscontaining 10 ml scintillation liquid and thoroughly mixed.
The level of 3HTdR incorporation was thenmeasured on a ß-scintillation counter. Similarly, background 3HTdR levels were also measured. The ß-scintillation counter expresses 3HTdR incorporation as the number of radioactive disintegrations per minute (DPM).
The proliferative response of lymph node cells is expressed as the number of radioactive disintegrations per minute per lymph node (DPM/node) and as the ratio of 3HTdR incorporated into lymph node cells of test group relative to the recorded control group (Stimulation Index S.I.). Before values were determined, mean scintillation background DPM was subtracted from data obtained.
In addition, mortality/viability (twice daily), body weights (priot to first application and prior to necropsy) and clinical signs (local/systemic, daily with particular attention to the treatment sites) were determined.

TREATMENT PREPARATION AND ADMINISTRATION:
The test item was placed into a volumetric flask on a tared Mettler balance and the vehicle was quantitatively added. The w/v dilutionswere prepared individually using a magnetic stirrer as homogenizer.
Test item solutions were made freshly before each dosing occasion and no more than 4 h prior to application.
Homogeneity was maintainedduring treatment with the magnetic stirrer.

Positive control substance(s):

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

Statistics:

A test item was considered as sensitizer if the following criteria were fulfilled:
- Exposure to at least one concentration resulted in an incorporation of 3HTdR of at least 3-fold or greater than in controls as indicated by S.I.
- Data were compatible with a conventional dose-response, although allowance must be for either local toxicity or immunological suppression.

For statistical analysis, the mean values and standard deviations were calculated in the body weight tables.

Parameter:

SI

Value:

0.8

Test group / Remarks:

2.5%

Parameter:

SI

Value:

1.1

Test group / Remarks:

5%

Parameter:

SI

Value:

1

Test group / Remarks:

10%

Cellular proliferation data / Observations:

The background DPM was measured twice and was 3 or 10, respectively. The dpm, determined for the control group, was 4593, for the 2.5 % group it was 3672, for the 5.0 % group it was 5122 and for the 10.0 % group it was 4488.

No deaths occured during the study period.

No symptoms of local toxicity at the ears of the animals and no systemic findings were observed during the study period.

The body weight of the aninals was within the normal range recorded for animals of this strain and age. One animal of the 10 % test item concentration group lost weight during the study, but this was considered to be incidental.

Test item concentration % (w/v)		dpm measurement	dpm - background	number of lymph nodes	dpm per lymph node	S.I.
	background	10
	background	3
	control group	4593	4586	8	573
2.5	test group	3679	3672	8	459	0.8
5.0	test group	5129	5122	8	640	1.1
10.0	test group	4495	4488	8	561	1.0

The positive control, alpha-hexylcinnamaldehyde, was tested in concentrations of 5.0, 10.0 and 25.0 % and produced S.I.s of 1.5, 2.3 and 8.4, respectively.

Interpretation of results:

GHS criteria not met

Conclusions:

In this study stimulation indices of 0.8, 1.1 and 1.0 were determined with the test material at concentrations of 2.5, 5 and 10 % (w/v), respectively in DMSO.
Under the experimental conditions chosen, the test material was not found to be a sensitizer when tested at up to the highest achievable concentration of 10 % (w/v) in DMSO.

Endpoint conclusion

Endpoint conclusion:

no adverse effect observed (not sensitising)

Respiratory sensitisation

Endpoint conclusion

Endpoint conclusion:

no study available

Additional information:

Local Lymph Node Assay

In a GLP-compliant study according to OECD TG 429, the test substance was applied up to the highest technically achievable concentration. No deaths occured during the study period. No symptoms of local toxicity at the ears of the animals and no systemic findings were observed during the study period. The body weight of the aninals was within the normal range recorded for animals of this strain and age. One animal of the 10 % test item concentration group lost weight during the study, but this was considered to be incidental. The positive control, alpha-hexylcinnamaldehyde, was tested in concentrations of 5.0, 10.0 and 25.0 % and produced S.I.s of 1.5, 2.3 and 8.4, respectively. In this study stimulation indices of 0.8, 1.1 and 1.0 were determined with the test material at concentrations of 2.5, 5 and 10 % (w/v), respectively in DMSO. Under the experimental conditions chosen, the test material was not found to be a sensitizer when tested at up to the highest achievable concentration of 10 % (w/v) in DMSO.

 

Justification for classification or non-classification

Classification, Labelling, and Packaging Regulation (EC) No. 1272/2008

The available experimental test data are reliable and suitable for classification purposes under Regulation 1272/2008. The stimulation indices in the LLNA (OECD 429) did not show a dose dependent increase. No EC3 could be established. As a result the substance is not considered to be classified for skin sensitization under Regulation (EC) No. 1272/2008, as amended for the fourteenth time in Regulation (EC) No. 2020/217.