β-Mercaptoethanol – Research Use Only

β-Mercaptoethanol (2-mercaptoethanol, BME) is a potent reducing agent widely used in biochemistry to cleave disulfide bonds in proteins and maintain a reducing environment. Supplied as a 100 mL high-purity liquid, this biotechnology-grade reagent is essential for protein denaturation, SDS-PAGE sample preparation, enzyme stabilization, and prevention of oxidative artifacts in molecular biology and protein chemistry workflows.

Scientific Overview

β-Mercaptoethanol is a small thiol-containing reducing agent that efficiently cleaves disulfide bonds (–S–S–) in proteins by forming mixed disulfides or free thiols. It is a cornerstone reagent in protein biochemistry for denaturing proteins under reducing conditions, preventing unwanted oxidation, and maintaining the activity of thiol-dependent enzymes. Its volatility and strong reducing power make it particularly useful in SDS-PAGE sample buffers, protein refolding studies, and redox-sensitive assays.

This β-Mercaptoethanol is suitable for:

• Reduction of disulfide bonds in proteins prior to electrophoresis or chromatography
• Prevention of oxidative dimerization during protein purification and storage
• Stabilization of enzymes containing essential cysteine residues
• Redox biology and thiol-disulfide exchange studies
• Sample preparation for mass spectrometry and structural biology

Usage & Handling Guidance

Store at room temperature (RT) in a well-ventilated area. The liquid is volatile and has a characteristic strong odor. Use in a fume hood when preparing concentrated solutions or adding to buffers. Dilute to the desired working concentration (commonly 1–5% v/v or 50–700 mM in sample buffers).

• Recommended applications: SDS-PAGE reducing buffer, protein denaturation, enzyme stabilization, and redox assays
• Typical working concentration: 1–5% (v/v) or 50–700 mM in sample buffers (optimize for specific protocol)
• Stability: Stable at RT when stored properly; protect from strong oxidants
• Handling: Use in a fume hood due to volatility and odor; avoid contact with skin and eyes

What You Get

• 100 mL β-Mercaptoethanol as a high-purity liquid
• Molecular weight 78.13 g/mol
• Biotechnology-grade reducing agent suitable for sensitive biochemical applications
• Batch-specific documentation available upon request
• For research use only (RUO)

Why Researchers Choose It

• Potent and reliable reducing agent for cleaving protein disulfide bonds
• Essential component in SDS-PAGE sample buffers and protein denaturation protocols
• Effective for maintaining reducing environments during enzyme purification and storage
• High-purity biotechnology-grade liquid for reproducible experimental results
• Convenient 100 mL volume for routine laboratory use

Frequently Asked Questions (FAQ)

• What is the primary function of β-Mercaptoethanol?
  It acts as a reducing agent to break disulfide bonds in proteins and maintain a reducing environment.
• What is the typical concentration used in SDS-PAGE sample buffer?
  Commonly 1–5% (v/v) or approximately 100–700 mM final concentration in the sample buffer.
• Why does it have a strong odor?
  The characteristic odor is due to its volatility as a small thiol compound. Use in a fume hood.
• Can this be stored at room temperature?
  Yes. It is stable at room temperature when stored in a tightly sealed container away from strong oxidants.
• Is β-Mercaptoethanol compatible with mass spectrometry?
  Yes, but excess reagent should be removed or quenched before MS analysis to avoid interference.

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References

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• Buscajoni L, et al. Refolding in the modern biopharmaceutical industry. Biotechnol Adv. 2022;60:108029.
• Wang Y, et al. A systematic protein refolding screen method using the DGR approach. Sci Rep. 2017;7(1):8274.
• Vallejo LF, Rinas U. Strategies for the recovery of active proteins through refolding of bacterial inclusion body proteins. Microb Cell Fact. 2004;3:11.
• Eiberle MK, Jungbauer A. Technical refolding of proteins: Do we have freedom to operate? Biotechnol J. 2010;5(6):547-559.
• Choi NS, et al. Comparative study of enzyme activity and stability of bovine and human plasmins in electrophoretic reagents, beta-mercaptoethanol, DTT, SDS, Triton X-100, and CHAPS. Electrophoresis. 2005;26(9):1754-1759.
• Nguyen NHA, et al. Effect of adding low levels of β-mercaptoethanol on the disulphide bonds of κ-casein and β-lactoglobulin solutions. Int Dairy J. 2012;26(1):52-58.
• Gessmann D, et al. Improving the resistance of a eukaryotic β-barrel protein to thermal and chemical denaturation. Protein Sci. 2011;20(11):1925-1935.
• Singhvi P, et al. Molecular attributes associated with refolding of inclusion body proteins. Front Microbiol. 2021;12:618559.