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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:
25 April 2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2019
Report date:
2019

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
OECD Guideline 439 (In Vitro Skin Irritation: Reconstructed Human Epidermis Test Method)
GLP compliance:
yes (incl. QA statement)

Test material

Constituent 1
Chemical structure
Reference substance name:
α-d-Glucopyranosiduronic acid, (3β,20β)-20-carboxy-11-oxo-30-norolean-12-en-3-yl 2-O-β-d-glucopyranuronosyl-, dipotassium salt
EC Number:
272-296-1
EC Name:
α-d-Glucopyranosiduronic acid, (3β,20β)-20-carboxy-11-oxo-30-norolean-12-en-3-yl 2-O-β-d-glucopyranuronosyl-, dipotassium salt
Cas Number:
68797-35-3
Molecular formula:
C42H62O16.2K
IUPAC Name:
α-d-Glucopyranosiduronic acid, (3β,20β)-20-carboxy-11-oxo-30-norolean-12-en-3-yl 2-O-β-d-glucopyranuronosyl-, dipotassium salt

In vitro test system

Test system:
isolated skin discs
Source species:
human
Cell type:
non-transformed keratinocytes
Cell source:
skin obtained from plastic surgery from multiple donors
Source strain:
other: human
Details on animal used as source of test system:
EPISKINTM (SM) (Manufacturer: SkinEthic, France, Batch No.: 18-EKIN-042, Expiry Date: 22 October 2018) is a three-dimensional human epidermis model. Adult human-derived epidermal keratinocytes are seeded on a dermal substitute consisting of a collagen type I matrix coated with type IV collagen. The origin of cells is human female breast from multiple donors from plastic surgery (usually 2). 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 (Tinois et al., 1994) [7]. Its use for skin irritation testing involves topical application of test materials to the surface of the epidermis, and the subsequent assessment of their effects on cell viability.
Vehicle:
water
Remarks:
10 µL of distilled water were applied to the epidermal surface in order to improve further contact between test item and epidermis and then 10 mg of the test item was applied evenly to the epidermal surface.
Control samples:
yes, concurrent negative control
yes, concurrent positive control
Amount/concentration applied:
10 mg of the test item was applied to the epidermal surface. The test item was spread gently on the skin surface with a pipette tip without damaging the epidermis units. The amount was sufficient to cover the epidermal surface.
Duration of treatment / exposure:
After the 15 minutes incubation time, the EPISKINTM (SM) units were removed and rinsed thoroughly with PBS to remove any remaining material from the epidermal surface as much as possible. The rest of the PBS was removed from the epidermal surface with a pipette (without touching the epidermis).
Duration of post-treatment incubation (if applicable):
After rinsing the units were placed into the plate wells with fresh pre-warmed Maintenance Medium (2 mL/well) below them and then incubated for 42 hours (±1 hour) at 37°C in an incubator with 5% CO2, in a >95% humidified atmosphere.
Number of replicates:
3 for each group (test item, positive and negative controls)

Results and discussion

In vitro

Results
Irritation / corrosion parameter:
% tissue viability
Run / experiment:
mean (%)
Value:
ca. 94.8
Vehicle controls validity:
not applicable
Negative controls validity:
valid
Positive controls validity:
valid
Remarks on result:
no indication of irritation

Applicant's summary and conclusion

Interpretation of results:
GHS criteria not met
Executive summary:

The irritation potential of the test item was evaluated according to the OECD No. 439 guideline;

the results indicate that the test item is non-irritant to skin.