Overview
Tocopheryl Acetate is the esterified form of natural or synthetic Vitamin E (α-Tocopherol), offering enhanced stability against oxidation. It is a key ingredient in anti-aging formulations due to its ability to neutralize free radicals and protect cellular membranes. The acetate form is preferred in industrial applications for its longer shelf life compared to unesterified tocopherol. First synthesized in the 1930s, it is now produced via esterification of tocopherol with acetic anhydride. The compound exists in multiple isomeric forms (D-α, DL-α), with D-α being biologically more active. Regulatory bodies like FDA and EFSA approve its use in food, cosmetics, and supplements within specified limits.
Physical and Chemical Properties
As a lipid-soluble compound, Tocopheryl Acetate exhibits high thermal stability (decomposes at >200°C) and resists hydrolysis under neutral conditions. Its viscosity ranges from 12,000-18,000 cP at 25°C, making it suitable for emulsion-based formulations. The acetate group shields the phenolic OH group of tocopherol, preventing premature oxidation. The UV absorption spectrum shows maxima at 284 nm (in ethanol), useful for analytical quantification. Unlike unesterified Vitamin E, it lacks reducing properties until metabolized in vivo. This chemical inertness allows incorporation into products requiring heat processing (e.g., baked goods, hot-filled cosmetics) without degradation.
Main Applications
In cosmetics, it functions as a skin-conditioning agent (1-5% concentration) in moisturizers, sunscreens, and haircare products, where it reduces transepidermal water loss. Pharma applications include softgel capsules (400-800 IU/dose) for Vitamin E supplementation, often combined with other fat-soluble vitamins. The food industry uses it (E307) as an antioxidant in edible oils, dairy analogs, and processed meats (0.01-0.1% of fat content). Emerging applications include stabilizing biodiesel fuels and as a preservative in animal feed. Industrial grades (70-90% purity) are used in lubricant additives, while >96% pure grades meet pharmacopeial standards.
Safety and Storage
Classified as non-hazardous under GHS, it has low acute toxicity (oral LD50 >2000 mg/kg in rats). Prolonged exposure to concentrated dust may cause mild eye irritation. Proper ventilation is recommended when handling powdered forms in bulk quantities. Storage requires amber glass or food-grade polyethylene containers with nitrogen headspace to prevent oxidation. Bulk liquid shipments should maintain temperatures above 15°C to prevent crystallization. Shelf life is typically 24 months when stored properly, though potency testing is advised for critical applications after 12 months.
B2B Procurement Guide
Specify required isomer composition (D-α vs. DL-α) based on bioavailability needs—D-α commands 30-50% premium over synthetic mixtures. For EU markets, ensure compliance with REACH registration (EC 231-710-0) and kosher/halal certifications if needed. Technical documents should include residual solvent analysis (e.g., hexanes <10 ppm), heavy metal content (Pb <2 ppm), and microbiological data. Consider toll manufacturing options for large-volume buyers (>10 MT/year) to reduce costs. Spot prices fluctuate with soybean oil markets (primary tocopherol source).
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