Overview
Sodium benzoate is the sodium salt of benzoic acid, first approved as a food preservative in the early 20th century. It inhibits mold, yeast, and bacterial growth by disrupting microbial enzyme systems. As one of the most cost-effective preservatives, it appears in over 40% of processed foods and numerous industrial applications. In the EU, it carries the E-number E211. The FDA permits concentrations up to 0.1% in foods. Its efficacy increases in acidic environments, making it ideal for carbonated drinks, fruit juices, and salad dressings where pH typically ranges from 2.5-4.0.
Physical and Chemical Properties
This compound forms colorless crystals or white powder with a slight benzaldehyde odor. It exhibits high water solubility (630 g/L at 25°C), which distinguishes it from benzoic acid (poor water solubility). The aqueous solution is slightly alkaline (pH ~8). Thermogravimetric analysis shows decomposition begins at 300°C, releasing sodium carbonate and benzene. Its preservative action stems from the undissociated benzoic acid molecule, which penetrates microbial cells more effectively in acidic conditions. The pKa is 4.2, meaning 50% exists in active form at pH 4.2.
Main Applications
In food production, sodium benzoate extends shelf life in soft drinks (typical use: 0.03-0.05%), pickles, and condiments. The pharmaceutical industry uses it as a preservative in liquid medications (expectorants, injectables) at 0.1-0.5% concentrations. Industrial applications include: 1) corrosion inhibitor in automotive coolants, 2) dye intermediate in textile manufacturing, and 3) stabilizer in photographic developers. Recent research explores its potential in silver nanoparticle synthesis for antimicrobial coatings.
Safety and Storage
The WHO acceptable daily intake is 5 mg/kg body weight. Potential concerns include benzene formation when combined with vitamin C (ascorbic acid) under heat/light, though modern manufacturing minimizes this risk. Store in polyethylene-lined bags or fiber drums at <30°C with <50% humidity. Incompatible with strong oxidizers and acids. For bulk handling, use dust control measures and PPE (gloves, goggles) to prevent respiratory or eye irritation. Shelf life is typically 3 years when stored properly.
B2B Procurement Guide
Key specifications to request: 1) Assay ≥99%, 2) Arsenic ≤3 ppm, 3) Loss on drying ≤1.5%, 4) Lead ≤2 ppm. Food-grade material should comply with FCC IX or E211 standards. Pharmaceutical grade requires USP/EP monographs. For international shipments, verify if the supplier provides pre-shipment COA and stability data. Consider regional regulations: EU requires 'E211' labeling, while the US lists it as 'sodium benzoate'. Container options include 25 kg bags (for small orders) or 1-ton super sacks for bulk purchases.
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