Potassium Sorbate[2]
Overview
Potassium Sorbate is the potassium salt of sorbic acid, a naturally occurring compound found in rowan berries. It is synthetically produced for industrial use due to its superior stability and solubility compared to sorbic acid. Approved globally as a food additive (E202), it inhibits microbial growth by disrupting cell membranes and enzyme systems. Its popularity stems from its broad-spectrum efficacy against fungi and select bacteria, coupled with low toxicity. Unlike traditional preservatives, it remains effective at low concentrations (0.05–0.3%) and does not alter product flavor or aroma when used correctly.
Physical and Chemical Properties
Potassium Sorbate appears as a white, free-flowing powder with a slight characteristic odor. It is hygroscopic, requiring airtight packaging to prevent clumping. The compound decomposes at high temperatures (above 270°C), releasing carbon oxides and potassium carbonate. Its antimicrobial action is pH-dependent, with optimal activity in acidic environments (pH 3–6.5). In neutral or alkaline conditions, its efficacy diminishes as it dissociates into inactive sorbic acid ions. Solubility in water is exceptionally high (58.2 g/100 mL at 20°C), facilitating easy incorporation into aqueous solutions like syrups or brines.
Main Applications
In the food industry, Potassium Sorbate extends shelf life in products such as cheeses, wines, dried fruits, and yogurt. It prevents mold in baked goods and stabilizes liquid sweeteners. Beverage manufacturers use it to halt fermentation in sweet wines and low-alcohol drinks. The cosmetic sector employs it in creams, shampoos, and lotions to inhibit microbial spoilage. Pharmaceutical formulations utilize it as a preservative for oral suspensions and topical treatments. In animal feed, it safeguards against fungal contamination without affecting palatability.
Safety and Storage
Classified as GRAS by the FDA, Potassium Sorbate has an ADI (Acceptable Daily Intake) of 25 mg/kg body weight. Overconsumption may cause mild allergic reactions in sensitive individuals, such as skin rashes or gastrointestinal discomfort. Storage requires protection from moisture and heat to prevent degradation. Bulk quantities should be kept in polyethylene-lined bags or drums under 25°C. Workers handling the powder should use dust masks and gloves to minimize inhalation or skin contact, though it poses low acute toxicity.
B2B Procurement Guide
Buyers should prioritize suppliers compliant with food-grade standards like FCC (Food Chemicals Codex) or USP (United States Pharmacopeia). Request a Certificate of Analysis (COA) detailing assay purity (typically 98–101%), heavy metal content (e.g., lead < 2 ppm), and microbiological limits. For international shipments, ensure packaging meets ISO standards to prevent moisture ingress. Spot-check deliveries for discoloration or off-odors, which indicate contamination. Consider long-term contracts with reputable manufacturers to secure stable pricing, as market rates fluctuate with potassium hydroxide and sorbic acid feedstock costs.
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