Overview
2-Mercaptoethanol (2-ME) is an organic compound containing both a hydroxyl and a thiol functional group. It is widely recognized for its role as a reducing agent in biochemical applications, particularly in breaking disulfide bonds in proteins. Its volatility and pungent odor are characteristic, requiring careful handling in laboratory and industrial settings. First synthesized in the early 20th century, 2-ME has become indispensable in molecular biology, notably for denaturing proteins in electrophoresis and protecting samples from oxidative damage. Its reactivity with oxidizing agents necessitates strict storage protocols to maintain stability.
Physical and Chemical Properties
2-Mercaptoethanol is a colorless to pale yellow liquid with a density of 1.114 g/cm³ at 20°C. It has a low melting point (-100°C) and boils at 157-158°C. The compound is highly soluble in water, ethanol, and ether, making it versatile for aqueous and organic solutions. Its thiol group (-SH) is responsible for its reducing properties, enabling the cleavage of disulfide bonds in proteins. However, this reactivity also makes it susceptible to oxidation, forming disulfides. The compound’s volatility requires airtight storage to prevent evaporation and contamination.
Main Applications
In biochemistry, 2-ME is a staple for reducing disulfide bonds in proteins during SDS-PAGE and Western blotting. It ensures proper protein unfolding for accurate molecular weight analysis. Additionally, it serves as an antioxidant in cell culture media, preventing oxidative stress in sensitive cell lines. Industrially, 2-ME is used as a stabilizer in polymer production, particularly for synthetic rubbers and adhesives. Its ability to scavenge free radicals enhances product shelf life. Smaller quantities are also employed in organic synthesis as a sulfur-based nucleophile.
Safety and Storage
2-Mercaptoethanol is toxic upon inhalation, ingestion, or skin contact, causing severe burns and respiratory irritation. Laboratory use mandates fume hoods, gloves, and eye protection. Spills should be neutralized with absorbent materials and disposed of as hazardous waste. Storage requires amber glass or polyethylene containers to limit light exposure, kept in cool (below 25°C), ventilated areas away from oxidizers. Large-scale industrial storage may involve inert gas purging to minimize oxidation risks.
B2B Procurement Guide
When procuring 2-ME, prioritize suppliers with certifications like ISO 9001 and REACH compliance. Key specifications include purity (≥98%), water content (<0.5%), and absence of heavy metals. Bulk buyers should request COA (Certificate of Analysis) and SDS (Safety Data Sheet). Packaging options range from 1L amber glass bottles to 200L drums, with prices varying by volume and purity. For international shipments, ensure compliance with IATA/IMDG regulations due to its hazardous classification. Long-term contracts may offer cost advantages.
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