Manganese bis(dihydrogen phosphate)

Skin irritation / corrosion

Administrative data

Endpoint:

skin irritation: in vitro / ex vivo

Type of information:

experimental study

Adequacy of study:

key study

Study period:

The study was performed between 12 June 2012 and 18 June 2012

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: see 'Remark'

Remarks:

Study conducted in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of the relevant results. This study is conducted according to an appropriate validated in vitro guideline and under the conditions of GLP and therefore the study is considered to be acceptable and to adequately satisfy both the guideline requirement and the regulatory requirement as a key study for this endpoint. In addition, the data is considered to be adequate and reliable for classification and labelling in accordance with Regulation (EC) No. 1272/2008 (EU CLP).

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2012

Report date:

2012

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

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

Deviations:

no

Test guideline 2

Qualifier:

according to guideline

Guideline:

OECD Guideline 439 (In Vitro Skin Irritation: Reconstructed Human Epidermis Test Method)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

Date of inspectection: 19-21 July 2011 Date of Signature: 31 August 2011

Test material

Test material information

Constituent 1

Reference substance name:

Manganese bis(dihydrogen phosphate)

EC Number:

242-520-2

EC Name:

Manganese bis(dihydrogen phosphate)

Cas Number:

18718-07-5

Molecular formula:

H3O4P.1/2Mn MnO8P2 H4MnO8P2

IUPAC Name:

manganese bis(dihydrogen phosphate)

Test material form:

solid: crystalline

Details on test material:

Sponsor's identification : Manganese bis(dihydrogen phosphate)
EC number : 242-520-2
CAS number : 18718-07-5
Description : pink crystalline solid
Batch number : MV 500
Purity : 96.7%
Date received : 16 April 2012
Expiry date : 08 September 2014
Storage conditions : room temperature in the dark

Test animals

Species:

other: reconstituted human epidermis model

Strain:

other: reconstituted human epidermis model

Details on test animals or test system and environmental conditions:

Not applicable

Test system

Type of coverage:

other: Topical

Preparation of test site:

other: Not applicable

Vehicle:

other: No vehicle used

Controls:

no

Amount / concentration applied:

TEST MATERIAL

- The test material was applied neat.

- Amount(s) applied (volume or weight with unit):
Approximately 10 mg of the test item was applied to the epidermis surface. The epidermis surface had previously been moistened with 5 μl of sterile distilled water to improve contact between the solid test item and the epidermis.

- Concentration (if solution):
The test material was used as supplied.

VEHICLE
No vehicle used

Duration of treatment / exposure:

15 minute exposure & 42 hour post-exposure incubation

Observation period:

Not applicable

Number of animals:

Not applicable

Details on study design:

TEST SITE
- Area of exposure:
Approximately 10 mg of the test item was applied to the epidermis surface. The epidermis surface had previously been moistened with 5 μl of sterile distilled water to improve contact between the solid test item and the epidermis.

- % coverage:
The test material was applied topically to the corresponding tissues ensuring uniform covering.

- Type of wrap if used:
None used

REMOVAL OF TEST SUBSTANCE
- Washing (if done):
At the end of the exposure period, each tissue was removed from the well using forceps and rinsed using a wash bottle containing DPBS with Ca++ and Mg++. Rinsing was achieved by filling and emptying each tissue insert for approximately 40 seconds using a constant soft stream of PBS to gently remove any residual test material. The rinsed tissues were transferred to the second column of 3 wells containing 2 ml of maintenance medium in each well. The rinsed tissues were incubated at 37ºC, 5% CO2 in air for 42 hours.

- Time after start of exposure:
15 minutes post-exposure

SCORING SYSTEM:
Quantitative MTT Assessment (percentage tissue viability)
For the test material the relative mean tissue viabilities obtained after the 15 minute treatment followed by the 42 hour post-exposure incubation period were compared to the mean of the negative control treated tissues (n=3). The relative mean viabilities were calculated in the following way:

mean OD540 of test material / mean OD540 of negative control x 100 = Relative mean tissue viability (percentage of negative control)

Classification of irritation potential is based upon relative tissue viability following the 15 minute exposure period followed by the 42 hour post-exposure incubation period according to the following:

Mean tissue viability is ≤50% : Irritant: H315, Category 2

Mean tissue viability is >50% : Non-Irritant (NI)

Results and discussion

In vitro

Results

Irritation / corrosion parameter:

other: other: Viability of cells

Value:

107.3

Remarks on result:

other:

Remarks:

Basis: mean Viability of cells (%). Time point: Day 6. Max. score: 100.0. Reversibility: other: Not applicable. Remarks: See relative mean viability below.. (migrated information)

In vivo

Irritant / corrosive response data:

The relative mean viability of the test material treated tissues was 107.3% after a 15-minute exposure.

Other effects:

No

Any other information on results incl. tables

RESULTS

Direct MTT Reduction

The MTT solution containing the test material did not turn blue which indicated that the test material did not directly reduce MTT.

Test Material, Positive Control Material and Negative Control Material

The individual and mean OD₅₄₀ values, standard deviations and tissue viabilities for the test material, negative control material and positive control material are given in Table 1. The mean viabilities and standard deviations of the test material and positive control, relative to the negative control are also given in Table 1.

The relative mean viability of the test material treated tissues was 128.1% after a 15 minute exposure.

The MTT solution containing the test item did not turn blue which indicated that the test item did not directly reduce MTT.

Quality Criteria

The relative mean tissue viability for the positive control treated tissues was 8.6% relative to the negative control treated tissues and the standard deviation value of the percentage viability was 1.0%. The positive control acceptance criterion was therefore satisfied.

The mean OD540 for the negative control treated tissues was 0.659 and the standard deviation value of the percentage viability was 6.2%. The negative control acceptance criterion was therefore satisfied.

The standard deviation calculated from individual percentage tissue viabilities of the three identically treated tissues was 8.7%. The test item acceptance criterion was therefore satisfied.

Table1 : Mean OD₅₄₀ Values and Percentage Viabilities for the Negative Control Material, Positive Control Material and Test Material

Material	OD540of tissues	Mean OD540of triplicate tissues	±SDof OD540	Relative individual tissue viability (%)	Relative mean viability (%)	± SD of Relative mean viability (%)
Negative Control Material¤	0.666	0.659	0.041	101.1	100*	6.2
	0.696			105.6
	0.615			93.3
Positive Control Material¤	0.059	0.056	0.006	9.0	8.6	1.0
	0.061			9.3
	0.049			7.4
Test Material	0.721	0.707	0.057	109.4	107.3	8.7
	0.644			97.7
	0.756			114.7

SD=    Standard deviation

*=     The mean viability of the negative control tissues is set at 100%

¤ = The control groups served as common controls with Harlan Laboratories Ltd, Project numbers 41200853, 41200860, 41200861, 41200871, 41200880, 41200884 and 41201543.

Applicant's summary and conclusion

Interpretation of results:

not irritating

Remarks:

Migrated information Criteria used for interpretation of results: EU

Conclusions:

The test material was considered to be Non-Irritant (NI).
This study is conducted according to an appropriate validated in vitro guideline and under the conditions of GLP and therefore the study is considered to be acceptable and to adequately satisfy both the guideline requirement and the regulatory requirement as a key study for this endpoint. In addition, the data is considered to be adequate and reliable for classification and labelling in accordance with Regulation (EC) No. 1272/2008 (EU CLP).Manganese bis(dihydrogen phosphate) is not considered to be classified in accordance with Regulation (EC) No. 1272/2008 (EU CLP).