Sulfanilamide[2]
Overview
Sulfanilamide is a foundational sulfonamide compound first synthesized in 1908 and later recognized for its antibacterial properties in the 1930s. As the parent molecule of sulfa drugs, it revolutionized antimicrobial therapy before the advent of penicillin. Industrially, it serves as a key intermediate for synthesizing advanced sulfonamide antibiotics and other specialty chemicals. Though largely replaced by modern antibiotics in human medicine, sulfanilamide remains relevant in veterinary applications and niche pharmaceutical formulations. Its simple aromatic sulfonamide structure makes it a versatile building block in organic synthesis, particularly for compounds requiring sulfa functional groups.
Physical and Chemical Properties
Sulfanilamide forms odorless, white needle-like crystals with a melting point of 164-166°C. It exhibits weak acidity (pKa ~10.4) due to the sulfonamide proton and demonstrates moderate stability under standard conditions. Thermal decomposition occurs above 200°C, releasing toxic fumes including sulfur oxides and nitrogen oxides. The compound shows preferential solubility in polar organic solvents like ethanol (50 mg/mL at 25°C) but limited solubility in water (7.5 mg/mL at 37°C). This solubility profile influences its formulation in pharmaceutical preparations. Its crystalline structure contributes to stability during storage, though hygroscopicity requires moisture-controlled packaging.
Main Applications
In modern industry, sulfanilamide primarily functions as: (1) A precursor for synthesizing sulfa drugs like sulfathiazole and sulfadiazine; (2) An active ingredient in topical veterinary antiseptics; (3) A reagent in chemical research for sulfonylation reactions. Notably, it sees continued use in developing countries for treating streptococcal infections when modern antibiotics are unavailable. Industrial applications extend to dye intermediates and corrosion inhibitors, leveraging its aromatic amine and sulfonamide functional groups. Recent research explores its potential in metal-organic frameworks (MOFs) for gas storage applications.
Safety and Storage
As a moderate irritant, sulfanilamide requires handling with nitrile gloves and safety goggles. Dust control measures are essential to prevent respiratory exposure (PEL: 5 mg/m³). Spills should be contained with inert absorbents and disposed as hazardous waste. Long-term storage demands airtight containers with desiccants, maintained below 30°C. Degradation products from moisture exposure may include sulfanilic acid and ammonia. Compatibility concerns exist with strong oxidizers and bases—segregation from these materials is critical in warehouse settings. Pharmaceutical-grade material typically carries a 3-year shelf life when properly stored.
B2B Procurement Guide
Industrial buyers should prioritize: (1) Purity verification (≥98% by HPLC for pharmaceutical use); (2) Residual solvent screening (methanol <3000 ppm); (3) Microbial limits testing for sterile applications. Bulk shipments (25kg fiber drums with polyethylene liners) offer cost advantages, while smaller R&D quantities (100g-1kg) are available in amber glass bottles. Audit suppliers for GMP compliance if supplying to regulated industries. Lead times vary from 2 weeks (in-stock) to 6 weeks (custom synthesis). Consider incoterms carefully—CIF pricing often includes hazardous material surcharges for international shipments.
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