Overview
Dibromobimane (DBB) is a synthetic organic compound widely used in biochemistry for its ability to selectively label thiol (-SH) groups in proteins and peptides. Developed in the late 20th century, it reacts with cysteine residues to form stable fluorescent adducts, enabling detection and quantification in complex biological systems. Its bifunctional structure allows crosslinking applications, though its primary use remains as a derivatization agent in proteomics and enzymology. DBB is favored for its high specificity and compatibility with common fluorescence detection methods.
Physical and Chemical Properties
Dibromobimane exists as a light-colored crystalline solid with moderate stability when stored properly. It decomposes at temperatures above 180°C without boiling. The compound exhibits limited water solubility but dissolves readily in polar organic solvents like dimethyl sulfoxide (DMSO), making it suitable for laboratory workflows. Its reactivity stems from the bromomethyl groups, which undergo nucleophilic substitution with thiols at physiological pH. The resulting bimane-thioether conjugate emits blue fluorescence (λex ~380 nm, λem ~480 nm), a property exploited in analytical techniques.
Main Applications
In research, DBB is primarily employed to tag cysteine residues in proteins for fluorescence-based assays, including SDS-PAGE visualization and protein folding studies. It's instrumental in quantifying free thiols in enzymes and antibodies, aiding in disulfide bond analysis. The pharmaceutical industry utilizes DBB for drug-protein interaction studies, while environmental scientists apply it to track thiol-containing pollutants. Its crosslinking capability also supports structural biology investigations of protein complexes.
Safety and Storage
As a brominated compound, DBB requires careful handling. It is corrosive to skin and eyes, necessitating nitrile gloves and splash-proof goggles during use. Work should occur in a fume hood to prevent inhalation of dust. Long-term storage demands anhydrous conditions at -20°C, preferably under argon or nitrogen to prevent degradation. Solutions in DMSO remain stable for weeks at -20°C if protected from light. Always consult SDS before use.
B2B Procurement Guide
When sourcing DBB, prioritize suppliers providing HPLC purity certificates (≥95%) and detailed batch analysis. Research-grade quantities (1g to 25g) are commonly stocked, with bulk orders requiring lead time. Key considerations include shipment with cold packs and desiccants to maintain stability. Compare lead times between specialized chemical distributors (e.g., Sigma-Aldrich, TCI America) and direct manufacturers. For GMP applications, ensure the supplier complies with relevant regulatory standards (USP, EP). Request recent stability data for long-term projects.
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