| Record Information |
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| Version | 2.0 |
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| Creation Date | 2009-06-19 21:58:21 UTC |
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| Update Date | 2014-12-24 20:23:13 UTC |
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| Accession Number | T3D1141 |
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| Identification |
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| Common Name | Manganese diselenide |
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| Class | Small Molecule |
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| Description | Manganese diselenide is a chemical compound of manganese and seleium. Manganese is a naturally occurring metal with the symbol Mn and the atomic number 25. It does not occur naturally in its pure form, but is found in many types of rocks in combination with other substances such as oxygen, sulfur, or chlorine. Manganese occurs naturally in most foods and small amounts are needed to stay healthy, as manganese ions act as cofactors for a number of enzymes. Selenium is a nonmetal element with the atomic number 34 and the chemical symbol Se. Selenium rarely occurs in its elemental state in nature and is usually found in sulfide ores such as pyrite, partially replacing the sulfur in the ore matrix. It may also be found in silver, copper, lead, and nickel minerals. Though selenium salts are toxic in large amounts, trace amounts of the element are necessary for cellular function in most animals, forming the active center of the enzymes glutathione peroxidase, thioredoxin reductase, and three known deiodinase enzymes. (6, 3, 4) |
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| Compound Type | - Food Toxin
- Inorganic Compound
- Manganese Compound
- Pollutant
- Selenium Compound
- Synthetic Compound
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| Chemical Structure | |
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| Synonyms | | Synonym | | Manganese selenide | | Manganese selenide (MnSe2) |
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| Chemical Formula | MnSe2 |
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| Average Molecular Mass | 212.860 g/mol |
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| Monoisotopic Mass | 214.771 g/mol |
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| CAS Registry Number | 12299-98-8 |
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| IUPAC Name | diselanylidenemanganese |
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| Traditional Name | manganese diselenide |
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| SMILES | [Se]=[Mn]=[Se] |
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| InChI Identifier | InChI=1S/Mn.2Se |
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| InChI Key | InChIKey=KDAKOPXAEMJUSU-UHFFFAOYSA-N |
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| Chemical Taxonomy |
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| Description | belongs to the class of inorganic compounds known as miscellaneous mixed metal/non-metals. These are inorganic compounds containing non-metal as well as metal atoms but not belonging to afore mentioned classes. |
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| Kingdom | Inorganic compounds |
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| Super Class | Mixed metal/non-metal compounds |
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| Class | Miscellaneous mixed metal/non-metals |
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| Sub Class | Not Available |
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| Direct Parent | Miscellaneous mixed metal/non-metals |
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| Alternative Parents | |
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| Substituents | - Inorganic selenide
- Inorganic salt
- Miscellaneous mixed metal/non-metal
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| Molecular Framework | Not Available |
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| External Descriptors | Not Available |
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| Biological Properties |
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| Status | Detected and Not Quantified |
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| Origin | Exogenous |
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| Cellular Locations | |
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| Biofluid Locations | Not Available |
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| Tissue Locations | Not Available |
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| Pathways | Not Available |
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| Applications | Not Available |
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| Biological Roles | Not Available |
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| Chemical Roles | Not Available |
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| Physical Properties |
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| State | Solid |
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| Appearance | Grey powder. |
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| Experimental Properties | | Property | Value |
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| Melting Point | Not Available | | Boiling Point | Not Available | | Solubility | Not Available | | LogP | Not Available |
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| Predicted Properties | |
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| Spectra |
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| Spectra | Not Available |
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| Toxicity Profile |
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| Route of Exposure | Oral (5) ; inhalation (5) ; dermal (5) |
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| Mechanism of Toxicity | Manganese is a cellular toxicant that can impair transport systems, enzyme activities, and receptor functions. It primarily targets the central nervous system, particularily the globus pallidus of the basal ganglia. It is believed that the manganese ion, Mn(II), enhances the autoxidation or turnover of various intracellular catecholamines, leading to increased production of free radicals, reactive oxygen species, and other cytotoxic metabolites, along with a depletion of cellular antioxidant defense mechanisms, leading to oxidative damage and selective destruction of dopaminergic neurons. In addition to dopamine, manganese is thought to perturbations other neurotransmitters, such as GABA and glutamate. In order to produce oxidative damage, manganese must first overwhelm the antioxidant enzyme manganese superoxide dismutase. The neurotoxicity of Mn(II) has also been linked to its ability to substitute for Ca(II) under physiological conditions. It can enter mitochondria via the calcium uniporter and inhibit mitochondrial oxidative phosphorylation. It may also inhibit the efflux of Ca(II), which can result in a loss of mitochondrial membrane integrity. Mn(II) has been shown to inhibit mitochondrial aconitase activity to a significant level, altering amino acid metabolism and cellular iron homeostasis. Selenium readily substitutes for sulfur in biomolecules and in many biochemical reactions, especially when the concentration of selenium is high and the concentration of sulfur is low. Inactivation of the sulfhydryl enzymes necessary for oxidative reactions in cellular respiration, through effects on mitochondrial and microsomal electron transport, might contribute to acute selenium toxicity. Selenomethionine (a common organic selenium compound) also appears to randomly substitute for methionine in protein synthesis. This substitution may affect the structure and functionability of the protein, for example, by altering disulfide bridges. Inorganic forms of selenium appear to react with tissue thiols by redox catalysis, resulting in formation of reactive oxygen species and causing damage by oxidative stress. (5, 3) |
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| Metabolism | Manganese is absorbed mainly via ingestion, but can also be inhaled. It binds to alpha-2-macroglobulin, albumin, or transferrin in the plasma and is distributed to the brain and all other mammalian tissues, though it tends to accumulate more in the liver, pancreas, and kidney. Manganese is capable of existing in a number of oxidation states and is believed to undergo changes in oxidation state within the body. Manganese oxidation state can influence tissue toxicokinetic behavior, and possibly toxicity. Manganese is excreted primarily in the faeces. Selenium may be absorbed through inhalation and ingestion, while some selenium compounds may also be absorbed dermally. Once in the body, selenium is distributed mainly to the liver and kidney. Selenium is an essential micronutrient and is a component of glutathione peroxidase, iodothyronine 5'-deiodinases, and thioredoxin reductase. Organic selenium is first metabolized into inorganic selenium. Inorganic selenium is reduced stepwise to the intermediate hydrogen selenide, which is either incorporated into selenoproteins after being transformed to selenophosphate and selenocysteinyl tRNA or excreted into the urine after being transformed into methylated metabolites of selenide. Elemental selenium is also methylated before excretion. Selenium is primarily eliminated in the urine and feces, but certain selenium compounds may also be exhaled. (5, 3) |
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| Toxicity Values | Not Available |
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| Lethal Dose | Not Available |
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| Carcinogenicity (IARC Classification) | 3, not classifiable as to its carcinogenicity to humans. (2) |
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| Uses/Sources | Not Available |
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| Minimum Risk Level | Chronic Inhalation: 0.0003 mg/m3 (Manganese) (1)
Chronic Oral: 0.005 mg/kg/day (Selenium) (1) |
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| Health Effects | Manganese mainly affects the nervous system and may cause behavioral changes and other nervous system effects, which include movements that may become slow and clumsy. This combination of symptoms when sufficiently severe is referred to as “manganism”. (3) |
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| Symptoms | Manganese mainly affects the nervous system and may cause behavioral changes and other nervous system effects, which include movements that may become slow and clumsy. This combination of symptoms when sufficiently severe is referred to as “manganism”. (3) |
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| Treatment | EYES: irrigate opened eyes for several minutes under running water. INGESTION: do not induce vomiting. Rinse mouth with water (never give anything by mouth to an unconscious person). Seek immediate medical advice. SKIN: should be treated immediately by rinsing the affected parts in cold running water for at least 15 minutes, followed by thorough washing with soap and water. If necessary, the person should shower and change contaminated clothing and shoes, and then must seek medical attention. INHALATION: supply fresh air. If required provide artificial respiration. |
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| Normal Concentrations |
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| Not Available |
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| Abnormal Concentrations |
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| Not Available |
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| External Links |
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| DrugBank ID | Not Available |
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| HMDB ID | Not Available |
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| PubChem Compound ID | 83014 |
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| ChEMBL ID | Not Available |
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| ChemSpider ID | 74897 |
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| KEGG ID | Not Available |
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| UniProt ID | Not Available |
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| OMIM ID | |
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| ChEBI ID | Not Available |
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| BioCyc ID | Not Available |
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| CTD ID | Not Available |
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| Stitch ID | Manganese diselenide |
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| PDB ID | Not Available |
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| ACToR ID | Not Available |
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| Wikipedia Link | Not Available |
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| References |
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| Synthesis Reference | Not Available |
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| MSDS | T3D1141.pdf |
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| General References | - ATSDR - Agency for Toxic Substances and Disease Registry (2001). Minimal Risk Levels (MRLs) for Hazardous Substances. U.S. Public Health Service in collaboration with U.S. Environmental Protection Agency (EPA). [Link]
- International Agency for Research on Cancer (2014). IARC Monographs on the Evaluation of Carcinogenic Risks to Humans. [Link]
- ATSDR - Agency for Toxic Substances and Disease Registry (2008). Toxicological profile for manganese. U.S. Public Health Service in collaboration with U.S. Environmental Protection Agency (EPA). [Link]
- Wikipedia. Manganese. Last Updated 26 May 2009. [Link]
- ATSDR - Agency for Toxic Substances and Disease Registry (2003). Toxicological profile for selenium. U.S. Public Health Service in collaboration with U.S. Environmental Protection Agency (EPA). [Link]
- Wikipedia. Selenium. Last Updated 7 June 2009. [Link]
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| Gene Regulation |
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| Up-Regulated Genes | Not Available |
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| Down-Regulated Genes | Not Available |
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