Everzol Red CDN Crude

Endpoint summary

Description of key information

The SI at 25% and 50% are 7.4 and 6.8 respectively. The EC3 value of Everzol Red CDN Crude was 12.3% (OECD TG429).

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

Study period:

From January 21, 2008 to May 07, 2008

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)

Qualifier:

according to guideline

Guideline:

EU Method B.42 (Skin Sensitisation: Local Lymph Node Assay)

Qualifier:

according to guideline

Guideline:

EPA OPPTS 870.2600 (Skin Sensitisation)

GLP compliance:

yes

Type of study:

mouse local lymph node assay (LLNA)

Species:

mouse

Strain:

CBA

Sex:

female

Details on test animals and environmental conditions:

- Source: Charles River France, L’Arbresle Cedex, France
- Age at study initiation: approx. 10 weeks old
- Housing: Individual in labeled Macrolon cages (MI type; height 12.5 cm)
- Acclimation period: at least 5 days
- Temperature (°C): 21.0 ± 3.0 °C
- Humidity (%): 30-70 %
- Photoperiod: 12-hrs dark / 12-hrs light

Vehicle:

propylene glycol

Concentration:

For preliminary study: 25% and 50%
For main study: 0% (vehicle), 10%, 25% and 50%

No. of animals per dose:

For preliminary study: one per dose
For main study: five per dose

Positive control substance(s):

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

Positive control results:

The EC3 of hexyl cinnamic aldehyde (HCA) was 14.1%.

Parameter:

SI

Value:

2.2

Test group / Remarks:

10% test substance

Parameter:

SI

Value:

7.4

Test group / Remarks:

25% test substance

Parameter:

SI

Value:

6.8

Test group / Remarks:

50% test substance

In preliminary study, the results indicated that no irritation was observed in any of the animals examined.

The results in main study as below:

 

Table 1. Skin reactions, body weights and relative size auricular lymph nodes

group	% test substance^1	an^2	Day1	Day3				Day6
			bw (g)^3	Skin reactions dorsal surface ear				bw (g)^3	Size nodes^4
				left		right			left	right
				erythema	oedema	erythema	oedema
1	0% (vehicle)	1	23	0	0	0	0	21	n	n
		2	23	0	0	0	0	22	n	n
		3	21	0	0	0	0	20	n	n
		4	23	0	0	0	0	22	n	n
		5	20	0	0	0	0	21	n	n
2	10%	6	22	G	0	G	0	22	n	n
		7	21	G	0	G	0	20	n	n
		8	20	G	0	G	0	20	n	n
		9	22	G	0	G	0	22	n	n
		10	24	G	0	G	0	24	n	n
3	25%	11	22	G	0	G	0	21	+	+
		12	21	G	0	G	0	21	+	+
		13	21	G	0	G	0	21	+	+
		14	23	G	0	G	0	21	+	+
		15	20	G	0	G	0	20	+	+
4	50%	16	21	G	0	G	0	22	+	+
		17	21	G	0	G	0	19	+	+
		18	22	G	0	G	0	20	+	+
		19	23	G	0	G	0	21	+	+
		20	23	G	0	G	0	22	n	n

1 Vehicle: Propylene glycol

2 Animal number

3 Body weight (g)

4 Relative size auricular lymph nodes (-, -- or ---: degree of reduction, +, ++ or +++: degree of enlargement, n: considered to be normal)

G No scoring possible due to red staining of the ears

 

Table 2. Radioactivity measurements (individual animals)

group	% test substance^1	animal	DPM / animal
1	0% (vehicle)	1	9^2
		2	286
		3	336
		4	174
		5	112
2	10%	6	47
		7	668
		8	863
		9	863
		10	95
3	25%	11	2093
		12	1341
		13	3214
		14	543
		15	1230
4	50%	16	1240
		17	1411
		18	2669
		19	2074
		20	378

1       Vehicle: Propylene glycol

2       Value rejected and not used for interpretation (outside historical range for commonly used vehicles)

 

Table 3. Disintegrations Per Minute (DPM) and Stimulation Index (SI)

Group	% test substance^1	mean DPM±SEM	SI±SEM
2	10%	507 ± 182	2.2 ± 0.9
3	25%	1684 ± 455	7.4 ± 2.6
4	50%	1554 ± 388	6.8 ± 2.3
1	0% (vehicle)	227 ± 51	1.0 ± 0.3

1 Vehicle: Propylene glycol

Interpretation of results:

Category 1 (skin sensitising) based on GHS criteria

Conclusions:

According to OECD 429 test method, the SI at 25% and 50% are 7.4 and 6.8 respectively. The EC3 value of Everzol Red CDN Crude was 12.3%. Therefore, Everzol Red CDN Crude was category 1 based on GHS criteria.

Executive summary:

This test using the procedures outlined in the NOTOX Study Plan for 487479. The results of this OECD 429 test for Everzol Red CDN Crude show that test reliability criteria was met. Based on the results of preliminary study, a 50% concentration was selected as the highest concentration that could be used in the main study. In the main study, three group of five experimental animals were treated with test substance concentrations of 10%, 25% or 50% on three consecutive days, by open application on the ears. Five vehicle control animals were similarly treated, but with vehicle alone (Propylene glycol). Three days after the last exposure, all animals were injected with H-methyl thymidine and after five hours the draining (auricular) lymph nodes were excised. After precipitating the DNA of the lymph node cells, radioactivity measurements were performed. The activity was expressed as the number of DPM and SI was subsequently calculated for each group.

The results indicated that no skin reactions were observed in any of the animals examined and no scoring for erythema was possible due to red staining by the test substance. Enlarged nodes were found in higher dose groups. Body weights and bodyweight gain of experimental animals remained in the same range as control over the study period. No mortality occurred and no symptoms of systemic toxicity were observed in the animals of the main study. Mean DPM/animal value for the experimental groups treated with concentrations 10, 25 and 50 % Everzol Red CDN Crude were 507, 1684 and 1554 respectively. On the basis of the test results given above, the SI at 25% and 50% are 7.4 and 6.8 respectively. The EC3 value of Everzol Red CDN Crude was 12.3%.

Endpoint conclusion

Endpoint conclusion:

adverse effect observed (sensitising)

Additional information:

Skin sensitization

The results indicated that no skin reactions were observed in any of the animals examined and no scoring for erythema was possible due to red staining by the test substance. Enlarged nodes were found in higher dose groups. Body weights and bodyweight gain of experimental animals remained in the same range as control over the study period. No mortality occurred and no symptoms of systemic toxicity were observed in the animals of the main study. Mean DPM/animal value for the experimental groups treated with concentrations 10, 25 and 50 % Everzol Red CDN Crude were 507, 1684 and 1554 respectively. On the basis of the test results given above, the SI at 25% and 50% are 7.4 and 6.8 respectively. T

he EC3 value of Everzol Red CDN Crude was 12.3%.

Respiratory sensitisation

Endpoint conclusion

Endpoint conclusion:

no study available