Ascorbyl palmitate is a fat-soluble ester formed from ascorbic acid (Vitamin C) and palmitic acid, with the molecular formula C22H38O7. Unlike regular ascorbic acid, which dissolves only in water, ascorbyl palmitate integrates directly into lipid-based systems. This makes it the preferred form of Vitamin C for protecting fats, oils, and oil-based formulations from oxidative degradation.
Produced as a solid powder with a citrus-like odor and a white to yellowish color, ascorbyl palmitate carries E number E304 and is approved for use in the United States, the European Union, Canada, Australia, and New Zealand. It has a long history of use as a food additive, particularly in edible fats and oils where water-soluble antioxidants cannot reach.
How Ascorbyl Palmitate Prevents Rancidity
The main function of ascorbyl palmitate in food manufacturing is as an antioxidant that prevents rancidity in fat-containing products. Because it is amphipathic, meaning it has both a hydrophobic tail and a hydrophilic head, it positions itself at the interface between fat and water in emulsion systems. This positioning allows it to intercept free radicals right where oxidation begins.
Ascorbyl palmitate is chosen over ascorbic acid in many foods specifically because of this lipophilic property. It blends directly into oils, shortenings, and emulsions without requiring a separate aqueous phase. Formulators use it in omega-3 oils, vegetable oils, and fat-based vitamin supplements to extend shelf life naturally.
Applications in Food and Confectionery
In baked goods, ascorbyl palmitate protects the fats in frostings, fillings, and cake batters from turning rancid during storage. It is also used in fried snack foods and extruded products where high processing temperatures accelerate lipid oxidation. By scavenging peroxide radicals at the earliest stages, it delays the onset of off-flavors and stale odors.
Confectionery products that contain cocoa butter, nut pastes, or other high-fat ingredients benefit from ascorbyl palmitate as well. It maintains flavor integrity over the shelf life of chocolate bars, pralines, and nut-based spreads. When combined with tocopherols and rosemary extract, it delivers a synergistic antioxidant effect that outperforms any single ingredient alone.
Clean-Label and Supplement Formulations
Ascorbyl palmitate fits the requirements for clean-label products because it is derived from Vitamin C and a naturally occurring fatty acid. It does not carry the consumer perception issues associated with synthetic antioxidants such as BHA or BHT. For brands marketing natural or minimally processed foods, it provides effective oxidation control with a recognizable ingredient name.
In dietary supplements, ascorbyl palmitate serves dual roles as both a source of Vitamin C and a stabilizer for lipid-based delivery systems. Soft gel capsules containing fish oil, flaxseed oil, or fat-soluble vitamins (A, D, E, K) often include ascorbyl palmitate to protect the active ingredients from degradation before consumption.
Stability and Handling Considerations
Ascorbyl palmitate is slightly soluble in water at 7.44 x 10-2 mg/L but dissolves readily in alcohol, animal oil, and vegetable oil. It is stable under normal storage conditions but should be protected from excessive heat, light, and moisture to maintain potency. Its vapor pressure of 2.09 x 10-15 mm Hg at 25 degrees Celsius means it does not volatilize under standard processing conditions.
When the body metabolizes ascorbyl palmitate, it is hydrolyzed back into ascorbic acid and palmitic acid. Both are naturally occurring compounds that the body processes through normal metabolic pathways, contributing to its strong safety profile as a food ingredient.
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