Description

L-Selenomethionine is an essential organoselenium compound where selenium replaces the sulfur atom in the amino acid L-methionine. This unique molecular structure makes it a highly bioavailable and critical source of selenium for nutritional and pharmaceutical applications. It is primarily utilized in the formulation of high-quality dietary supplements, functional foods, and advanced research into antioxidant systems. The product is supplied as L-Selenomethionine CAS NO 3211-76-5, meeting stringent purity standards for sensitive end-uses.

Application

• Dietary Supplements & Nutraceuticals: A premium, bioavailable source of selenium for capsules, tablets, and liquid formulations.
• Pharmaceutical Intermediates: Used in the synthesis of specialized drugs and therapeutic agents targeting oxidative stress.
• Animal Nutrition (Feed Additives): Incorporated into premixes for livestock, poultry, and aquaculture to support immune function and selenium status.
• Biochemical Research: Essential reagent in studies of selenium metabolism, antioxidant enzymes like glutathione peroxidase, and trace element biology.
• Functional Food & Beverage Fortification: Added to health-focused foods and drinks to enhance their nutritional selenium content.
• Cosmeceuticals: Potential ingredient in advanced skincare products for its antioxidant properties.

Basic Information

Product Name	L-Selenomethionine
CAS No.	3211-76-5
Molecular Formula	C5H11NO2Se
Molecular Weight	196.11 g/mol
Synonyms	(S)-2-Amino-4-(methylseleno)butyric acid; Se-Methylselenocysteine precursor; Seleno-L-methionine; L-(-)-Selenomethionine; SELENOMETHIONINE, L-; (S)-2-Amino-4-(methylselanyl)butanoic acid; SeMet
EINECS	221-734-1

Quality Control

Our L-Selenomethionine is manufactured under strict quality management systems. Each batch is tested to ensure it meets high-purity specifications suitable for nutraceutical and research applications. We provide comprehensive Certificates of Analysis (COA) detailing purity, identity, and impurity profiles. While not necessarily compendial, our quality standards align with the principles of GMP, FCC, and USP guidelines for amino acid derivatives.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at a controlled room temperature (15-25°C). This product is easily oxidized (store under inert atmosphere) and is light-sensitive (store away from light). For long-term stability, consider storage under an inert gas such as argon or nitrogen.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Optical Rotation [α]20/D	+ 15.0° to + 20.0° (c=1 in 1N HCl)
Heavy Metals (as Pb)	≤ 10 ppm
Loss on Drying	≤ 1.0%
Residue on Ignition	≤ 0.1%
Selenium Content	39.0 - 41.0%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.