GRADE & PURITYBioReagent?BioReagent grade — tested suitable for life-science and molecular-biology use. Use for cell culture, assays, and biochemical work needing biological compatibility.
BioReagent BioReagent for sensitive chromatographic and analytical workflows requiring minimal baseline interference.
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Storage & shipping
Store at 2-8°C,Protected from light Ships Wet ice Check lot-specific COA for exact specifications.
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Quality documents
SDS, COA, datasheet, and spec sheet available for download. Lot-specific COA accessible via lot number lookup.
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Literature proof
Cited in 0 peer-reviewed publications across chromatography, organic synthesis, and cross-coupling reactions.
Panoramica
There are three sulfur-containing amino acids in proteins: methionine, cystine, and cysteine (Cys). Among them, Cys is the only sulfur-containing amino acid that contains a sulfhydryl (-SH) group. It is derived from methionine and can be interconverted with cystine. Cys participates in the formation of protein disulfide bonds, often constitutes part of the active site of proteins, and can provide sulfhydryl groups for other physiological and biochemical reactions. Furthermore, Cys accumulates abundantly on the surface of the skin and mucous membranes. It maintains the activity of crucial sulfhydryl enzymes involved in keratin production, replenishes sulfhydryl groups to support normal skin metabolism, and regulates the production of underlying melanin by pigment cells in the deepest layer of the epidermis. These functions contribute to its roles in skin whitening, detoxification, and improving inflammatory and allergic skin conditions.
Assay Principle: Cys reduces phosphotungstic acid to produce tungsten blue, which exhibits an absorption peak at 600 nm. The Cys content is calculated based on the absorbance at 600 nm.
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What does BioReagent mean?
BioReagent indicates that the product has been processed and tested for biological and biochemical applications. Specifications may include endotoxin limits, microbial controls, sterility, low DNase/RNase/protease activity, and verified biological activity where relevant.
How should this product be stored?
Store at 2–8 °C, protected from light. The material is light-sensitive — keep it in its original opaque or amber container.
How is this product shipped?
This product ships chilled on wet ice. Unpack on arrival and transfer it to the storage condition stated above.
What documentation is provided?
Available product documentation, including Certificates of Analysis (COA), Safety Data Sheets (SDS), and specification sheets, is shown in the product document area. Document availability and access follow the current site policy.
Need help choosing the grade?
Our grade selection guide covers purity, stabilizer status, and application suitability for all variants in our catalog.
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Products are supplied to verified businesses, institutions, and qualified professionals for research and development use only. Not for use in humans, animals, diagnosis, or therapy.
