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EC number: 838-538-0 | CAS number: 52139-31-8
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Endpoint summary
Administrative data
Description of key information
Skin irritation:
- study conducted according to OECD guideline 439 (2019), in vitro irritation:Reconstructed Human Epidermis Test Method, non-transformed kerationocytes were exposed to approx. 25 mg of the test item Manganese monoglycinate sulfate for 1h in triplicate, after 42h post-incubation time the cell viability was measured by a MTT-assay. Mean vialibility of three tissues was 19.3% and thus under 50% viability which is necessary for classification, thus the test item is considered to be at least irritating to the skin accoding to Regulation (EC) No 1272/2008 (CLP) and the Globally Harmonized System of Classifcation and Labelling of Chemicals (GHS).
Eye irritation:
In an ex vivo study according to OECD guideline no. 437 (Oct. 2017), the corneal damage potential of manganese monoglycinate sulfate was assessed by quantitative measurements of changes in opacity and permeability in a bovine cornea.
The test itemwas applied onto the cornea of a bovine eye which had been previously incubated with cMEM without phenol red at 32 ± 1 °C for 1 hour and whose opacity had been measured. The test item was incubated on the cornea for 4 hours at 32 ± 1 °C. After removal of the test item, opacity and permeability values were measured.
Under the conditions of this study, the test item manganese monoglycinate sulfate showed no effects on the cornea of the bovine eye. The calculated mean IVIS was 1.70. According to OECD Guideline no. 437 (Oct. 2017), a substance with an IVIS ≤ 3 requires no classification for eye irritation or serious eye damage.
Key value for chemical safety assessment
Skin irritation / corrosion
Link to relevant study records
- Endpoint:
- skin irritation: in vitro / ex vivo
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2019-11-27 to 2020-04-30
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 439 (In Vitro Skin Irritation: Reconstructed Human Epidermis Test Method)
- Version / remarks:
- adopted 18th June 2019
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Test system:
- human skin model
- Source species:
- human
- Cell type:
- non-transformed keratinocytes
- Cell source:
- other: not specified
- Justification for test system used:
- This in vitro study was performed in order to evaluate the potential of Manganese monoglycinate sulfate to evoke skin irritation in a reconstructed human epidermis (RhE) test method. The test method can diskriminate between non-classification and classification in Cat 1 or Cat 2 according to Regulation (EC) No 1272/2008 (CLP) and the Globally Harmonized System for Classification and Labelling of Chemicals (GHS).
- Vehicle:
- unchanged (no vehicle)
- Remarks:
- Tissues wetted with DPBS buffer
- Details on test system:
- RECONSTRUCTED HUMAN EPIDERMIS (RHE) TISSUE
- Model used: The test system is a commercially available EpiDerm™-Kit. The EpiDerm™ tissue consists of human-derived epidermal keratinocytes which have been cultured to form a multi-layered, highly differentiated model of the human epidermis. It consists of organized basal, spinous and granular layers, and a multi-layered stratum corneum containing intercellular lamellar lipid layers representing main lipid classes analogous to those found in vivo.
- Tissue batch number(s): Kit: 30851
- Delivery date: 2020-03-10
- Date of initiation of testing: 2020-03-11
TEMPERATURE USED FOR TEST SYSTEM
- Temperature used during treatment / exposure: 37°C
- Temperature of post-treatment incubation (if applicable): 37°C
REMOVAL OF TEST MATERIAL AND CONTROLS
-Volume and number of washing steps: 1 hour after the first application, the inserts were removed from the plates using sterile forceps and rinsed immediately in 1-minute-intervals.
- Observable damage in the tissue due to washing: not observed
MTT DYE USED TO MEASURE TISSUE VIABILITY AFTER TREATMENT / EXPOSURE
- MTT concentration: 1 mg/mL
- Incubation time: 3 hours
- Spectrophotometer: Anthos Reader 2010 Flexi (Anthos Microsysteme GmbH)
- Wavelength: 570 nm
FUNCTIONAL MODEL CONDITIONS WITH REFERENCE TO HISTORICAL DATA
- Viability: MTT QC assay, 4 hours, n=3: OD (540-570 nm)[1.0 - 3.0], Result: 1.771 ± 0.07
- Barrier function: ET-50 assay, 100 µL 1% Triton-X-100, 4 time-points, n=3, MTT assay; ET-50 [4.77 - 8.72 h];, Results: 5.13 h
- Contamination: Long term antibiotic and antimycotic free culture; no contamination, Result Sterile
NUMBER OF REPLICATE TISSUES: three tissues were used for each treatment
PREDICTION MODEL / DECISION CRITERIA (choose relevant statement)
-The test chemical is identified as requiring classification and labelling according to UN GHS (Category 2 or Category 1) if the mean percent tissue viability after 1h exposure and post-treatment incubation is less than or equal (≤) to 50%.
- The test chemical may be considered as non-irritant to skin in accordance with UN GHS No Category if the tissue viability after 1h exposure and post-treatment incubation is more than (>) 50%. - Control samples:
- yes, concurrent negative control
- Amount/concentration applied:
- TEST MATERIAL
- Amount(s) applied (volume or weight with unit): Tissue 1: 26.2 mg, Tissue 2: 26.5 mg, Tissue 3: 26.9 mg
NEGATIVE CONTROL
- Amount(s) applied (volume or weight): 30 µL DPBS
POSITIVE CONTROL
- Amount(s) applied (volume or weight): 30 µL SDS solution
- Concentration (if solution): 5% - Duration of treatment / exposure:
- 1 h
- Duration of post-treatment incubation (if applicable):
- 42 h
- Number of replicates:
- 3
- Irritation / corrosion parameter:
- % tissue viability
- Run / experiment:
- tissue 1
- Value:
- 18.8
- Vehicle controls validity:
- not examined
- Negative controls validity:
- valid
- Remarks:
- OD between 0.8 and 2.8
- Positive controls validity:
- valid
- Remarks:
- < 20% of negative control
- Irritation / corrosion parameter:
- % tissue viability
- Run / experiment:
- tissue 2
- Value:
- 21
- Vehicle controls validity:
- not examined
- Negative controls validity:
- valid
- Remarks:
- OD between 0.8 and 2.8
- Positive controls validity:
- valid
- Remarks:
- < 20% of negative control
- Irritation / corrosion parameter:
- % tissue viability
- Run / experiment:
- tissue 3
- Value:
- 18.1
- Vehicle controls validity:
- not examined
- Negative controls validity:
- valid
- Remarks:
- OD between 0.8 and 2.8
- Positive controls validity:
- valid
- Remarks:
- < 20% of negative control
- Other effects / acceptance of results:
- - OTHER EFFECTS:
- Visible damage on test system: Not reported
- Direct-MTT reduction: not observed
- Colour interference with MTT: not observed
DEMONSTRATION OF TECHNICAL PROFICIENCY: The validity of the skin irritation study at LAUS GmbH was demonstrated in a proficiency study. For this purpose, 10 proficiency chemicals (indicated by the OECD 439 guideline) were tested.
All of the 10 proficiency chemicals were correctly categorized. Therefore, the proficiency of the skin irritation study was demonstrated.
ACCEPTANCE OF RESULTS:
- Acceptance criteria met for negative control: yes, OD should be between 0.8 and 2.8, mean OD for the negative control was 1.411
- Acceptance criteria met for positive control: yes, The viability should be < 20% of the negative control, the mean viability was 3.3%
- Acceptance criteria met for variability between replicate measurements: yes, the variability should be < 18%, the variability were 3.0% for the negative control, 0.1% for the positive control and 10.2% for the test item
- Range of historical values if different from the ones specified in the test guideline: No - Interpretation of results:
- other: based on the test conditions used in the present test the substance is at least calssified as Category 2 irritant
- Conclusions:
- In the present test the skin irritation potential of manganese monoglycinate sulfate was evaluated according to OECD guideline 439 (2019). Human keratinocytes, 3 tissues, were exposed to 25 mg test item for 1h. After a postincubation time of 42h the viability was determined using the MTT assay. The mean viability of three tissues was < 50% (19.3%), thus the test item is considered to be at least irritating to the skin accoding to Regulation (EC) No 1272/2008 (CLP) and the Globally Harmonized System of Classifcation and Labelling of Chemicals (GHS).
- Executive summary:
In a dermal irritation study performed in accordance with OECD Guideline 439 (In Vitro Skin Irritation) (2019), manganese monoglycinate sulfate (100% a.i.) was applied to the three-dimensional human epidermis model tissue for an exposure period of 1h in triplicates. 5 μL of deionised water were topically applied to the epidermal surface in order to improve further contact between the solid and the epidermis. Each approximately 25 mg of the test item were applied to the wetted tissues. The test item was spread to match the surface of the tissue.
After 1h exposure, first at room temperature and at least 35 min at 37 ± 1°C and 5.0 ± 1% CO2and ≥ 95% relative humidity, the tissues were washed with phosphate buffered saline to remove any residual test material. Subsequently the tissue constructs were incubated for 42 h at 37°C. Cytotoxicity (irritancy) was expressed as the reduction of mitochondrial dehydrogenase activity measured by formazan production from MTT at the end of the treatment.
The positive (5% SDS) and negative (phosphate buffered saline) control gave responses that were within the acceptance criteria and as such demonstrated the validity of the study.
The relative mean tissue viability obtained after 1h treatment with manganese monglycinate sulfate compared to the negative control tissues was 19.3%. Since the mean relative tissue viability for the test substance was below 50%, manganese monoglycinate sulfate is considered at least irritating to the skin.
- Endpoint:
- skin corrosion: in vitro / ex vivo
- Type of information:
- (Q)SAR
- Adequacy of study:
- supporting study
- Study period:
- 2020
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- results derived from a (Q)SAR model, with limited documentation / justification, but validity of model and reliability of prediction considered adequate based on a generally acknowledged source
- Justification for type of information:
- 1. SOFTWARE
OECD QSAR Toolbox 4.4.1
2. MODEL (incl. version number)
Version 4.4.1
3. SMILES OR OTHER IDENTIFIERS USED AS INPUT FOR THE MODEL
Molecular Structure of chemical formula: C2H5MnNO6S
4. SCIENTIFIC VALIDITY OF THE (Q)SAR MODEL
For detailed information please refer to the attachted justification section
5. APPLICABILITY DOMAIN
For detailed information please refer to the attachted justification section
6. ADEQUACY OF THE RESULT
For detailed information please refer to the attachted justification section - Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Skin irritation/corrosion alerts gathered from QSAR Toolbox
- GLP compliance:
- no
- Irritation / corrosion parameter:
- other: QSAR prediction
- Vehicle controls validity:
- not applicable
- Negative controls validity:
- not applicable
- Positive controls validity:
- not applicable
- Remarks on result:
- other: QSAR prediction: BfR exclusion rules: Based on physico-chemical properties of the substance the manganese monoglycinate sulfate is not considered to be corrosive to the skin.
- Interpretation of results:
- other: QSAR prediction
- Conclusions:
- Using the molecular structure of manganese monoglycinate sulfate in the QSAR prediction profiler 'BfR exclusion rules' revealed that the substance is not considered to be corrosive to the skin based on its physico-chemical properties.
- Executive summary:
There are no data about the corrosivity to the skin of manganese monoglycinate sulfate. Hence, a QSAR prediction was performed using the OECD QSAR Toolbox and the profiler 'BfR exclusion rules'. Of the rules available, three were met for manganese monoglycinate sulfate, namely a low LogKow (-3.21), a predicted high melting point (decomp. > 300°C) and a low lipid solubility < 0.01 g/kg. Thus, the substance is not considered to be corrosive.
Referenceopen allclose all
Historical data
Parameter |
Negative Control |
Positive Control Negative Control) |
Substance |
DPBS buffer |
Sodium Dodecyl Sulphate Solution 5% |
Mean |
1.779 |
4.2% |
Standard deviation |
0.310 |
2.9% |
Range |
0.476 – 2.471 |
1.7% - 17.1% |
Study |
1.411 |
3.3% |
Table 2: Absorbance Values negative control, test item, positive control (570 nm)
Designation |
Measurement |
Negative Control |
Manganese monoglycinate sulfate |
Positive Control |
Tissue 1 |
1 |
1.491 |
0.298 |
0.080 |
2 |
1.495 |
0.299 |
0.080 |
|
Tissue 2 |
1 |
1.421 |
0.331 |
0.082 |
2 |
1.434 |
0.329 |
0.081 |
|
Tissue 3 |
1 |
1.411 |
0.290 |
0.080 |
2 |
1.416 |
0.289 |
0.079 |
Table 3: % Tissue viability
Designation |
Manganese monoglycinate sulfate |
Positive Control |
% Tissue viability (tissue 1) |
18.8% |
3.3% |
% Tissue viability (tissue 2) |
21.0% |
3.4% |
% Tissue viability (tissue 3) |
18.1% |
3.3% |
% Tissue viability (mean) |
19.3% |
3.3% |
± SD of mean tissue viability (%) |
1.5% |
0.1% |
Endpoint conclusion
- Endpoint conclusion:
- adverse effect observed (irritating)
Eye irritation
Link to relevant study records
- Endpoint:
- eye irritation: in vitro / ex vivo
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2019-12-12 - 2020-01-16
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 437 (Bovine Corneal Opacity and Permeability Test Method for Identifying i) Chemicals Inducing Serious Eye Damage and ii) Chemicals Not Requiring Classification for Eye Irritation or Serious Eye Damage)
- Version / remarks:
- October 2017
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU method B.47 (Bovine corneal opacity and permeability test method for identifying ocular corrosives and severe irritants)
- Version / remarks:
- February 2017
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- other: OECD Guideline for the Testing of Chemicals, Series on Testing and Assessment No. 160
- Version / remarks:
- “GUIDANCE DOCUMENT ON “THE BOVINE CORNEAL OPACITY AND PERMEABILITY (BCOP) AND ISOLATED CHICKEN EYE (ICE) TEST METHODS: COLLECTION OF TISSUES FOR HISTOLOGICAL EVALUATION AND COLLECTION OF DATA ON NON-SEVERE IRRITANTS”; 25. Oct. 2011
- GLP compliance:
- yes (incl. QA statement)
- Species:
- cattle
- Strain:
- not specified
- Details on test animals or tissues and environmental conditions:
- SOURCE OF COLLECTED EYES
- Source: slaughterhouse Müller Fleisch GmbH, Industriestraße 42, 75217 Birkenfeld, Germany
- Number of animals: not specified
- Characteristics of donor animals (e.g. age, sex, weight): between 12 and 60 months old
- Storage, temperature and transport conditions of ocular tissue (e.g. transport time, transport media and temperature, and other conditions): The eyes were transported to the test facility in Hanks’ Balanced Salt Solution with 1% Penicillin-Streptomycin solution (Penicillin 100 U/mL, Streptomycin 100 µg/mL) in a suitable cooled container within 1 hour and 10 minutes.
- Time interval prior to initiating testing: 1 h
- indication of any existing defects or lesions in ocular tissue samples: only corneas which were free from damages were used
- Indication of any antibiotics used: no - Vehicle:
- Hank's balanced salt solution
- Controls:
- yes, concurrent positive control
- yes, concurrent negative control
- Amount / concentration applied:
- TEST MATERIAL
- Amount(s) applied (volume or weight with unit): 750 µL
- Concentration (if solution): 20 % (w/v)
VEHICLE
- Amount(s) applied (volume or weight with unit): 750 µL - Duration of treatment / exposure:
- 4 h
- Duration of post- treatment incubation (in vitro):
- 90 min
- Number of animals or in vitro replicates:
- 3
- Details on study design:
- SELECTION AND PREPARATION OF CORNEAS: After the arrival of the corneas, they were examined and only corneas which were free from damages were used. The corneas were excised with a scalpel and cut from the globe with a 2-3 mm ring of sclera around the outside. Each cornea was transferred to a cornea holder in which pre-warmed cMEM (32 ± 1 °C) without phenol red was filled. The holders were then incubated for 1 hour in the incubation chamber at 32 ± 1 °C. After the initial incubation, the medium was completely changed and the baseline opacity for each cornea was recorded.
QUALITY CHECK OF THE ISOLATED CORNEAS: None of the corneas showed tissue damage; therefore, all corneas were used.
NUMBER OF REPLICATES: 3
NEGATIVE CONTROL USED: yes, concurrent vehicle
POSITIVE CONTROL USED: yes, Imidazole, 20 % solution in HBSS
APPLICATION DOSE AND EXPOSURE TIME: 750 µL each for 4 h
TREATMENT METHOD: Closed chamber for controls. Open chamber for test item suspension.
POST-INCUBATION PERIOD: yes, 90 min
REMOVAL OF TEST SUBSTANCE
- Number of washing steps after exposure period: thorough rinsing
METHODS FOR MEASURED ENDPOINTS:
- Corneal opacity: opacitometer
- Corneal permeability: passage of sodium fluorescein dye measured with the aid of microtiter plate reader (OD492)
SCORING SYSTEM: In Vitro Irritancy Score (IVIS)
DECISION CRITERIA: as indicated in the TG. - Irritation parameter:
- in vitro irritation score
- Run / experiment:
- 1-3
- Value:
- 1.7
- Vehicle controls validity:
- not applicable
- Negative controls validity:
- valid
- Positive controls validity:
- valid
- Remarks on result:
- no indication of irritation
- Other effects / acceptance of results:
- OTHER EFFECTS:
- Visible damage on test system: not reported
ACCEPTANCE OF RESULTS:
- Acceptance criteria met for negative control: yes
- Acceptance criteria met for positive control: yes - Interpretation of results:
- GHS criteria not met
- Conclusions:
- Under the conditions of this ex vivo study (BCOP), a 20 % suspension of the test item in HBSS did not induce an increase of the corneal opacity and permeability as compared to negative control. The calculated mean in vitro score was 1.70, which corresponds to "no category" according to UN GHS.
- Executive summary:
In this ex vivo study according to OECD guideline no. 437 (Oct. 2017, the corneal damage potential of manganese monoglycinate sulfate was assessed by quantitative measurements of changes in opacity and permeability in a bovine cornea.
Bovine corneas were collected from slaughtered cattle that were between 12 and 60 months old.
The test item was applied onto the cornea of a bovine eye which had been previously incubated with cMEM without phenol red at 32 ± 1 °C for 1 hour and whose opacity had been measured.
The test item was incubated on the cornea for 4 hours at 32 ± 1 °C. After removal of the test item, opacity and permeability values were measured.
Hank’s Balanced Salt Solution (HBSS) was used as negative control. The negative control showed no irritating effect on the cornea and the calculated mean IVIS (In Vitro Irritancy Score) was 2.08.
20 % imidazole solution was used as positive control. The positive control induced serious eye damage on the cornea and was within two standard deviations of the current historical mean. The calculated mean IVIS was 107.99.
Under the conditions of this study, the test itemmanganese monoglycinate sulfateshowed no effects on the cornea of the bovine eye. The calculated mean IVIS was 1.70.
According to OECD Guideline no. 437 (Oct. 2017), a substance with an IVIS ≤ 3 requires no classification for eye irritation or serious eye damage.
Reference
Findings and Results
Opacity and Permeability Values
The illuminance (unit: LUX) values which were measured before and after exposure are given in the following table:
Table 1: Illuminance Values. Rep. = Replicate
Parameter |
Negative Control |
Test Item |
Positive Control |
||||||
1. Rep. |
2. Rep. |
3. Rep. |
1. Rep. |
2. Rep. |
3. Rep. |
1. Rep. |
2. Rep. |
3. Rep. |
|
(I) Measured values before exposure |
1051 |
1056 |
1057 |
1037 |
1042 |
1046 |
1017 |
1027 |
1028 |
(I) Measured values after exposure |
1039 |
966 |
1026 |
956 |
947 |
969 |
350 |
389 |
366 |
The values in the following tables present the calculated opacity values, according to evaluation.
Table 2: Opacity Values Negative Control. Rep. = Replicate
Parameter |
Negative Control |
||
1. Rep. |
2. Rep. |
3. Rep. |
|
Opacity before exposure |
2.10 |
1.90 |
1.86 |
Opacity after exposure |
2.58 |
5.75 |
3.11 |
Opacity Difference |
0.48 |
3.85 |
1.25 |
Mean Opacity Difference |
1.86 |
Table 3: Opacity Values Test Item and Positive Control. Rep. = Replicate.
Parameter |
Test Item |
Positive Control |
||||
1. Rep. |
2. Rep. |
3. Rep. |
1. Rep. |
2. Rep. |
3. Rep. |
|
Opacity before exposure |
2.66 |
2.46 |
2.30 |
3.49 |
3.07 |
3.03 |
Opacity |
6.22 |
6.66 |
5.61 |
85.25 |
72.75 |
79.80 |
Opacity |
3.57 |
4.20 |
3.31 |
81.76 |
69.68 |
76.77 |
Opacity corrected |
1.71 |
2.34 |
1.46 |
79.90 |
67.82 |
74.91 |
Mean Opacity corrected |
1.83 |
74.21
|
For the permeability measurement, three replicates for each treatment group were measured three times. cMEM without phenol red was measured as blank value as well. The optical density values at 492 nm are given in the following tables:
Table 4: Optical density at 492 nm of Blank.
Parameter |
cMEM without phenol red |
1. Measurement |
0.037 |
2. Measurement |
0.037 |
3. Measurement |
0.034 |
Mean |
0.036 |
Table 5: Optical density at 492 nm of Negative Control, Test Item and Positive Control. Rep. = Replicate. * Note: Two replicates for the positive control were obtained by measurement of a fivefold diluted solution and multiplication of the absorbances with factor 5.
Parameter |
Negative Control |
Test Item |
Positive Control |
||||||
1. Rep. |
2. Rep. |
3. Rep. |
1. Rep. |
2. Rep. |
3. Rep. |
1. Rep. |
2. Rep. |
3. Rep. |
|
1.Measure-ment |
0.052 |
0.053 |
0.047 |
0.050 |
0.042 |
0.038 |
1.771 |
0.638 |
0.599 |
2.Measure-ment |
0.052 |
0.055 |
0.046 |
0.046 |
0.043 |
0.037 |
1.746 |
0.690 |
0.589 |
3.Measure-ment |
0.052 |
0.054 |
0.048 |
0.048 |
0.039 |
0.036 |
1.769 |
0.685 |
0.060 |
|
|||||||||
1.Measure-ment – blank |
0.0160 |
0.0170 |
0.0110 |
0.0140 |
0.0060 |
0.0020 |
1.7350 |
0.6020 |
0.5630 |
2.Measure-ment – blank |
0.0160 |
0.0190 |
0.0100 |
0.0100 |
0.0070 |
0.0010 |
1.7100 |
0.6540 |
0.5530 |
3.Measure-ment – blank |
0.0160 |
0.0180 |
0.0120 |
0.0120 |
0.0030 |
0.0000 |
1.7330 |
0.6490 |
0.0236 |
Mean of each replicate |
0.0160 |
0.0180 |
0.0110 |
0.0120 |
0.0053 |
0.0010 |
1.7260 |
0.6350 |
0.3799 |
Mean of the 3 replicates |
0.0150 |
-- |
-- |
||||||
Corrected |
-- |
-- |
-- |
-0.0030 |
-0.0097 |
-0.0140 |
1.7110 |
3.1600* |
1.8843* |
Corrected mean of the 3 replicates |
-- |
-0.0089 |
2.2518 |
IVIS Values
The calculated IVIS for each replicate and the corresponding means are presented in the following table:
Table 6: IVIS
Test Group |
IVIS |
Mean IVIS |
Relative Standard Deviation IVIS |
Negative Control |
0.72 |
2.08 |
86.23% |
4.12 |
|||
1.41 |
|||
Test Item |
1.66 |
1.70 |
28.02% |
2.20 |
|||
1.25 |
|||
Positive Control |
105.57 |
107.99 |
5.91% |
115.22 |
|||
103.18 |
Note: the high relative standard deviations of the IVIS of the negative control and test item are due to mathematical reasons, as the respective means are very small.
Validity
According to the guideline, the test is considered as valid if the positive control causes an IVIS that falls within two standard deviations of the current historical mean.
The mean IVIS of the negative control has to show an IVIS ≤ 3.
The validity criteria and findings are given in the following table:
Table 7: Validity
Parameter |
Criterion |
Found |
Assessment |
Mean IVIS of negative control HBSS |
≤ 3 |
2.08 |
ok |
Mean IVIS of positive control |
75.63 – 146.38 |
107.99 |
ok |
Values for negative and positive controls were within the range of historical data of the test facility. Therefore, the test system was acceptable.
Assessment
According to OECD Guideline no. 437 (Oct. 2017), a substance with an IVIS ≤ 3 requires no classification for eye irritation or serious eye damage.
Table 8: Classification Scheme
IVIS |
UN GHS |
≤ 3 |
No category |
> 3 and ≤ 55 |
No prediction can be made |
> 55 |
Eye damage Category I |
In the negative control, no signs of eye irritation were observed.
The positive control induced serious eye damage, which would be classified as GHS category I.
The test item showed no effects on the cornea of the bovine eye. The calculated mean IVIS (In Vitro Irritancy Score) was 1.70. The experiment is considered as sufficient for the classification of the test item, because all three replicates of the test item lead to the same assessment for the test item.
Endpoint conclusion
- Endpoint conclusion:
- no adverse effect observed (not irritating)
Respiratory irritation
Endpoint conclusion
- Endpoint conclusion:
- no study available
Additional information
In a dermal irritation study performed in accordance with OECD Guideline 439 (In Vitro Skin Irritation) (2019), manganese monoglycinate sulfate (100% a.i.) was applied to the three-dimensional human epidermis model tissue for an exposure period of 1h in triplicates. 5 μL of deionised water were topically applied to the epidermal surface in order to improve further contact between the solid and the epidermis. Each approximately 25 mg of the test item were applied to the wetted tissues. The test item was spread to match the surface of the tissue.
After 1h exposure, first at room temperature and at least 35 min at 37 ± 1°C and 5.0 ± 1% CO2and ≥ 95% relative humidity, the tissues were washed with phosphate buffered saline to remove any residual test material. Subsequently the tissue constructs were incubated for 42 h at 37°C. Cytotoxicity (irritancy) was expressed as the reduction of mitochondrial dehydrogenase activity measured by formazan production from MTT at the end of the treatment.
The positive (5% SDS) and negative (phosphate buffered saline) control gave responses that were within the acceptance criteria and as such demonstrated the validity of the study.
The relative mean tissue viability obtained after 1h treatment with manganese monglycinate sulfate compared to the negative control tissues was 19.3%. Since the mean relative tissue viability for the test substance was below 50%, manganese monoglycinate sulfate is considered at least irritating to the skin.
Following the ‘New guidance document on an integrated approach on testing and assessment (IATA) for skin corrosion and irritation’ a second test was started according to OECD guideline 431 to evaluate the skin corrosivity of the substance. The results of this study were not available before registration of the substance, thus, manganese monoglycinate sulfate is classified as at least irritating to the skin. Based on structural alerts gathered with the OECD QSAR Toolbox, some of the BfR exclusion rules are met, according to these, manganese monoglycinate sulfate is constituted of fragments of which all fragments have a melting point > 200 °C and the lipid solubility is < 0.01g/kg, thus, manganese monoglycinate sulfate is not considered to be skin corrosive but is classified as irritating to the skin Category 2 (according to regulation (EU) No. 1272/2008 (CLP)) for precautionary reasons.
In an ex vivo study according to OECD guideline no. 437 (Oct. 2017, the corneal damage potential of manganese monoglycinate sulfatewas assessed by quantitative measurements of changes in opacity and permeability in a bovine cornea.
Bovine corneas were collected from slaughtered cattle that were between 12 and 60 months old.
The test item was applied onto the cornea of a bovine eye which had been previously incubated with cMEM without phenol red at 32 ± 1 °C for 1 hour and whose opacity had been measured.
The test item was incubated on the cornea for 4 hours at 32 ± 1 °C. After removal of the test item, opacity and permeability values were measured.
Hank’s Balanced Salt Solution (HBSS) was used as negative control. The negative control showed no irritating effect on the cornea and the calculated mean IVIS (In VitroIrritancy Score) was 2.08.
20 % imidazole solution was used as positive control. The positive control induced serious eye damage on the cornea and was within two standard deviations of the current historical mean. The calculated mean IVIS was 107.99.
Under the conditions of this study, the test itemmanganese monoglycinate sulfate showed no effects on the cornea of the bovine eye. The calculated mean IVIS was 1.70.
Justification for classification or non-classification
A study conducted according to OECD guideline 439 (2019) revealed a mean cell viability of 19.3%. According to the classification criteria of the guideline a mean tissue viability of ≤ 50% is considered as an inconclusive result. Due to the generally low toxicity of manganese monoglycinate sulfate and the information that was gathered from the OECD QSAR Toolbox, the substance is classified as Category 2 'Causes skin irritation' according to Regulation (EU) No. 1272/2008 (CLP) and the Globally Harmonized System for Classification and Labelling of Chemicals (GHS) for precautionary reasons.
Based on the information available the test item manganese monoglycinate sulfate does not need to be classified for eye irritation or serious eye damage according to Regulation (EU) No. 1272/2008 (CLP) and the Globally Harmonized System for Classification and Labelling of Chemicals (GHS).
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