Hydrogenated rosin, zinc salt

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

04-Jan-2016 to 11-Jan-2016

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: The study has been performed according to OECD and/or EC guidelines and according to GLP principles.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2016

Report date:

2016

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

other: EU method B.46 (In Vitro Skin Irritation: Reconstructed Human Epidermis Model Test)

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

other: OECD Guideline no. 439: In Vitro Skin Irritation: Reconstructed Human Epidermis Test Method

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Test material

Test material information

Constituent 1

Reference substance name:

bis((7-isopropyl-1,4a-dimethyl-1,2,3,4.4a.5.6.7.8.9.10.10a-dodecahydrophenanthrene-1-carbonyl)oxy)zinc

EC Number:

810-810-3

Cas Number:

68425-02-5

Molecular formula:

The substance is a UVCB, of which a major component can be represented by the following: [C20H33O2]2Zn

IUPAC Name:

bis((7-isopropyl-1,4a-dimethyl-1,2,3,4.4a.5.6.7.8.9.10.10a-dodecahydrophenanthrene-1-carbonyl)oxy)zinc

Test material form:

solid

Details on test material:

- Name of test material (as cited in study report): Resin acids and Rosin acids, hydrogenated, zinc salts
- Substance type: Brown coloured, brittle solid
- Storage condition of test material: At room temperature

In vitro test system

Vehicle:

unchanged (no vehicle)

Test system

Amount / concentration applied:

TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 20.2 to 24.0 mg, moistened with 5 µl water

NEGATIVE CONTOL:
- Amount(s) applied (volume or weight with unit): 25 µl Phosphate buffered saline

POSITIVE CONTROL
- Amount(s) applied (volume or weight with unit): 25 µl
- Concentration (if solution): 5% (aq) Sodium dodecyl sulphate

Duration of treatment / exposure:

Exposure:15 minutes
Post incubation period: 42 hours

Details on study design:

TEST SITE
- Area of exposure: human epidermis model
- % coverage: 0.38 cm2

REMOVAL OF TEST SUBSTANCE
- Washing (if done): phosphate buffered saline
- Time after start of exposure: 15 minutes

POST INCUBATION PERIOD
- 42 hours

SCORING SYSTEM:
- After a 42 hour incubation period, determination of the cytotoxic (irritancy) effect was performed. Cytotoxicity is expressed as the reduction of mitochondrial dehydrogenase activity measured by formazan production from MTT at the end of the treatment. Cell viability was calculated for each tissue as a percentage of the mean of the negative control tissues.

Results and discussion

In vitro

Results

Irritation / corrosion parameter:

other: other: percentage viability

Value:

93

Negative controls validity:

valid

Positive controls validity:

valid

Remarks on result:

other: non-irritatant

Remarks:

Basis: other: percentage of control. Time point: 15 minutes. (migrated information)

Applicant's summary and conclusion

Conclusions:

The in vitro skin irritation test was conducted according to OECD 439 guideline and GLP principles.

It is concluded that this test is valid and that Resin acids and Rosin acids, hydrogenated, zinc salts is non-irritant in the in vitro skin irritation test.

Executive summary:

Skin irritation is expressed as the remaining cell viability after exposure to the test item. The relative mean tissue viability obtained after 15±0.5 minutes treatment with Resin acids and Rosin acids, hydrogenated, zinc salts compared to the negative control tissues was 93%. Since the mean relative tissue viability for Resin acids and Rosin acids, hydrogenated, zinc salts was above 50% Resin acids and Rosin acids, hydrogenated, zinc salts is considered to be non-irritant.

The positive control had a mean cell viability after 15±0.5 minutes exposure of 7%. The absolute mean OD₅₇₀of the negative control tissues was within the laboratory historical control data range. The standard deviation value of the percentage viability of three tissues treated identically was less than 8%, indicating that the test system functioned properly.