2,4,6-Trinitrobenzenesulfonic acid

Structure of 2,4,6-Trinitrobenzenesulfonic acid

3D model of 2,4,6-Trinitrobenzenesulfonic acid

2,4,6-Trinitrobenzenesulfonic acid (TNBS) is a chemical compound that is commonly used in biochemical research. It is a derivative of benzenesulfonic acid with three nitro groups attached to the benzene ring.

Chemical Properties

2,4,6-Trinitrobenzenesulfonic acid is a sulfonic acid with the chemical formula C₆H₃N₃O₉S. It is a yellow crystalline solid that is soluble in water and other polar solvents. The presence of three nitro groups makes it a strong electrophile, which is useful in various chemical reactions.

Uses in Biochemistry

TNBS is widely used in the field of biochemistry for the detection and quantification of amino acids and proteins. It reacts with primary amines to form a colored complex, which can be measured spectrophotometrically. This property makes it useful in protein quantification assays.

Mechanism of Action

The reaction of TNBS with primary amines involves the formation of a Meisenheimer complex, where the nitro groups act as electron-withdrawing groups, facilitating the nucleophilic attack by the amine. This results in the formation of a stable colored product.

Safety and Handling

2,4,6-Trinitrobenzenesulfonic acid is a hazardous chemical and should be handled with care. It is an irritant to the skin, eyes, and respiratory tract. Proper safety precautions such as wearing gloves and goggles should be taken when handling this compound.

Related Compounds

• 2,4,6-Trinitrotoluene (TNT)
• Picric acid
• Benzenesulfonic acid

Related Pages

• Amino acid analysis
• Protein assay
• Spectrophotometry