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Toxicological information

Skin irritation / corrosion

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Administrative data

Endpoint:
skin irritation: in vitro / ex vivo
Type of information:
experimental study
Adequacy of study:
key study
Study period:
July 11- 16, 2012
Reliability:
1 (reliable without restriction)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2012
Report Date:
2012

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
OECD Guideline 439 (In Vitro Skin Irritation: Reconstructed Human Epidermis Test Method)
Qualifier:
according to
Guideline:
EU Method B.46 (In Vitro Skin Irritation: Reconstructed Human Epidermis Model Test)
Qualifier:
according to
Guideline:
other: L’Oréal Standard Operating Procedure: “EpiSkin™ Skin Irritation Test Method“; - ECVAM Skin Irritation Validation Study - Validation of the EpiSkin™ Test Method15 min - 42 hours for the Prediction of Acute Skin Irritation of Chemicals. Version 1.8, 02-2009
Qualifier:
according to
Guideline:
other: ECVAM Performance Standards for in vitro Skin Irritation Test Methods based on Reconstructed human Epidermis (RhE). Updated Version 24-Aug-2009
Qualifier:
according to
Guideline:
other: ISO 10993-10, Annex D: 2010, “Biological evaluation of medical devices - Part 10: Tests for irritation and skin sensitization”
GLP compliance:
yes (incl. certificate)

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
other: liquid
Details on test material:
Name: Formaldehyde, reaction product with ethylenediamine
CAS No.: 84066-92-2
Batch No.: PK280-61
Colour: colourless to yellow
Purity: 100%

In vitro test system

Test system:
human skin model
Source species:
human
Cell type:
non-transformed keratinocytes
Details on animal used as source of test system:
The test will be carried out with the reconstituted three-dimensional human skin model EPISKIN-SM™ (SkinEthic). This skin model consists of normal (non-cancerous), adult human-derived epidermal keratinocytes (NHEK) which have been cultured to form a multilayered, highly differentiated model of the human epidermis. The NHEK are cultured on chemically modified, collagen-coated cell culture inserts. A highly differentiated and stratified epidermis model is obtained after 13-day culture period comprising the main basal, supra basal, spinous and granular layers and a functional stratum corneum

Test animals

Species:
other: human skin model

Results and discussion

In vitro

Results
Irritation / corrosion parameter:
% tissue viability
Value:
ca. 92
Vehicle controls validity:
valid
Negative controls validity:
not specified

Any other information on results incl. tables

The potential of the test item to induce skin irritation was analysed by using the three-dimensional human skin model EPISKIN-SM™ (SkinEthic) comprising a reconstructed epidermis with a functional stratum corneum.

In the present study Formaldehyde, reaction product with ethylenediamine was applied topically to the EPISKIN-SM™ tissue for 15 min followed by a 42 h post incubation period and immediate determination of cytotoxic effects via MTT reduction assay.

Irritant potential of the test item was predicted from the relative mean tissue viabilities obtained compared to the corresponding negative control tissues concurrently treated with PBS.

The test item showed no irritant effects. The mean relative tissue viability (% negative control) was > 50% (92%) after 15 min treatment and 42 h post incubation.

The controls confirmed the validity of the study. The mean OD550 of the six blank values was < 0.1 (92%) after 15 min treatment and 42 h post incubation. The controls confirmed the validity of the study. The mean OD550 of the six blank values was < 0.1. The mean absolute OD550 of the three negative control tissues was ≥ 0.6 and ≤ 1.5. The mean relative tissue viability (% negative control) of the positive control was ≤ 40% (7%). The maximum standard deviation of viability of replicate tissues of all dose groups was < 18% (3.4% - 9.8%)

Applicant's summary and conclusion

Interpretation of results:
not irritating
Remarks:
Migrated information
Conclusions:
In this study under the given conditions the test item showed no irritant effects. The test item is therefore classified as “non-irritant” in accordance
with UN GHS and EU CLP “No Category”.