Seleno-DL-methionine
Seleno-DL-methionine (CAS: 1464-42-2, C5H11NO2Se) is a selenium-containing amino acid with a molecular weight of 196.11 g/mol. It is a derivative of the essential amino acid methionine, where the sulfur atom is replaced by selenium. This compound finds use in biochemical research and as a reagent in various chemical syntheses, particularly where selenium incorporation is required. It is supplied by TSS with an assay of ≥99% (TLC).

Biochemical Research
Seleno-DL-methionine serves as a crucial reagent in biochemical studies, especially for investigating the roles of selenoproteins and selenium metabolism in biological systems. Its structure allows for the incorporation of selenium into proteins during synthesis.
Chemical Synthesis
It is employed as a building block in organic synthesis, facilitating the introduction of selenium into complex molecules. This is particularly relevant in the development of novel organoselenium compounds for various research applications.
Reagent for Analytical Applications
Used as a specialised reagent in analytical chemistry where selenium's unique properties are exploited. It can be involved in the preparation of standards or in specific detection methodologies.
| Molecular weight | 196.11 |
|---|---|
| Empirical formula | C5H11NO2Se |
| Assay | ≥99% (TLC) |
| Storage temperature | −20°C |



Hazard statements
- H301Toxic if swallowed
- H331Toxic if inhaled
- H373May cause damage to organs through prolonged exposure
- H410Very toxic to aquatic life with long-lasting effects
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P273Avoid release to the environment
- P301IF SWALLOWED
- P311Call a POISON CENTER or doctor
- P501Dispose of contents and container per local regulations
| Protective equipment | Eyeshields, Faceshields, Gloves, type P2 (EN 143) respirator cartridges |
|---|---|
| Transport (UN / ADR) | UN 3283 6.1 / PGII |
| Water hazard class (WGK, DE) | 3 |
| Hazard codes (EU) | T,N |
| Risk statements (R) | 23/25-33-50/53 |
| Safety statements (S) | 20/21-28-45-60-61 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Seleno-DL-methionine primarily used for?
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Seleno-DL-methionine is primarily used in biochemical research for studying selenoproteins and selenium metabolism, and as a reagent in chemical synthesis for introducing selenium into molecules.
What are the CAS number and formula for Seleno-DL-methionine?
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The CAS number for Seleno-DL-methionine is 1464-42-2, and its molecular formula is C5H11NO2Se.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Seleno-DL-methionine with an assay of ≥99% determined by TLC. TSS does not represent this product as USP, BP, or EP grade.
How should Seleno-DL-methionine be handled and stored?
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Handle Seleno-DL-methionine with extreme care due to its toxicity. Use appropriate personal protective equipment, including eyeshields, face shields, gloves, and a P2 respirator. Store at -20°C. Refer to the safety data sheet for comprehensive handling instructions.
Is Seleno-DL-methionine a controlled substance?
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The provided data does not indicate that Seleno-DL-methionine is a controlled substance. However, it is classified as toxic and environmentally hazardous.
How can I request a sample or a quote for Seleno-DL-methionine?
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To request a sample or a quote for Seleno-DL-methionine, please contact the Tech Serve Solutions sales team through our website or by calling our offices.
How is Seleno-DL-methionine packed and exported?
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Seleno-DL-methionine is packed according to safety regulations for toxic substances and is exported globally by Tech Serve Solutions, complying with all relevant shipping and hazardous materials transport guidelines (UN 3283 6.1/PGII).
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