Propyl gallate is primarily made from gallic acid and propanol, undergoing esterification usually with an acid catalyst [1]. Gallic acid can be derived from various plant sources such as gallnuts, sumac, tea leaves, and oak bark [2]. It is commonly used as an antioxidant to protect fats and oils from rancidity, thereby preventing the deterioration of food quality [3].
The production process of propyl gallate typically involves reacting gallic acid with propanol in the presence of a catalyst, such as sulfuric acid [4]. This esterification process results in the formation of propyl gallate and water. The reaction mixture is then purified through various steps, including washing, drying, and crystallization, to obtain the final product [4].
Propyl gallate functions as an antioxidant by scavenging free radicals, which are responsible for the oxidation of fats and oils. By inhibiting oxidation, it helps to maintain the flavor, color, and overall quality of food products, thus extending their shelf life [5].
Propyl gallate is widely used in various food applications, including vegetable oils, animal fats, fried foods, meat products, and emulsions [6]. It is also used in cosmetics, pharmaceuticals, and industrial applications [7].
Propyl gallate is generally packaged in multi-layer paper bags, fiber drums, or polyethylene bags to protect it from light, moisture, and air [8]. It should be stored in a cool, dry, and well-ventilated area, away from incompatible substances [8].
Citations
- Decker, E. A. "Antioxidants: Mechanisms of Action in Foods." Encyclopedia of Food Sciences and Nutrition, 2003, pp. 281-286.
- Ozawa, T., et al. "Antioxidant and Anti-Inflammatory Activities of Gallic Acid." Yakugaku Zasshi, vol. 131, no. 9, 2011, pp. 1317-1322.
- Branen, A. L. "Toxicology and Biochemistry of Butylated Hydroxyanisole and Butylated Hydroxytoluene." Journal of the American Oil Chemists' Society, vol. 52, no. 2, 1975, pp. 59-63.
- Kirk, R. E., et al. Kirk-Othmer Encyclopedia of Chemical Technology. 4th ed., John Wiley & Sons, 1991.
- Shahidi, F., and Janitha, P. K. "Antioxidant Phytochemicals in Food." Antioxidant Phytochemicals in Food, 2001.
- Hunter, R. S. "The Measurement of Appearance." The Measurement of Appearance, 1975.
- Draelos, Z. D. Cosmetics Dermatology. Blackwell Science, 2005.
- Food Chemicals Codex. 6th ed., United States Pharmacopeia, 2008.
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