Propyl gallate (PG)

分子式：

C10H12O5

分子量：

212.2

储存条件：

0-6°C

Propyl gallate (, also known as propyl gallate, English synonyms and Chinese synonyms, trihydroxybenzoic acid propyl gallate, trihydroxybenzoic acid n-propyl benzoic acid propyl ester propyl trihydroxybenzoate Propyl gallate Gallate Impurities Ranitidine Propyl gallate English name Molecular formula Molecular weight Propyl gallate Chemical properties Melting point (Storage conditions Solubility Water solubility ( ) Chemical properties Milky white needle crystals or white to light yellowish brown crystalline powder , odorless, slightly bitter, melting point ℃. Stable to heat, easy to decompose when exposed to light, turns purple or dark green when exposed to copper and iron ions, and hygroscopic. Easily soluble in hot water, ethanol, propylene glycol, glycerin, cotton Seed oil, lard, peanut oil and ether are insoluble in cold water. The aqueous solution is about 1/(/,) taken orally by rats. They are sensitive to heat and decompose at the melting point, so they have poor stability when used in food. , not resistant to high temperatures and not suitable for baking. Solubility: Slightly soluble in water and easily soluble in ethanol, ether and propylene glycol. Determine according to the method. Melting range ~ ℃. The sample is dried at ℃. Gallic acid test takes a sample and is approximately soluble in hydrogen In sodium oxide, boil under a stream of nitrogen, cool, and carefully acidify with sulfuric acid to ~. Filter out the precipitate through a sintered glass crucible, wash with a small amount of water and dry at ℃. The melting point of the resulting gallic acid crystal is about ℃ (then Decomposition). As a common oil-soluble antioxidant, it has been widely used in oils and oil-containing foods, fried foods, meat foods, pollen foods, cosmetics, etc. It is composed of gallic acid and n-propanol under the condition of acidic dehydrating agent , the food additive propyl gallate is obtained by heating and esterification. It is also used as a feed antioxidant allowed in my country and widely used abroad. According to my country's regulations, it can also be used in edible oils, fried foods, biscuits, instant noodles, quick-cooked rice, and nuts. Canned, dried fish products and cured meat products, maximum usage. The antioxidant capacity of lard is stronger or stronger. When mixed with lard or synergist, the antioxidant effect is the strongest. The antioxidant effect of single-noodle products is not as good as that of lard and lard. Strong. It is also an oil-soluble antioxidant that is allowed to be used in my country and is widely used abroad. It has a stronger antioxidant capacity than lard. When mixed with lard and synergists, the antioxidant effect is the strongest. But the antioxidant effect of lard products is the strongest. It is not as strong as and strong. Our country stipulates that it can be used in edible oils, fried foods, biscuits, instant noodles, quick-cooked rice, canned nuts, dried fish products and cured meat products, with a maximum usage amount. This product is a food and feed additive. Used as oil and fat , lard, etc., has a strong antioxidant effect, but has the disadvantage of coloring. The dosage is as follows. When used as a feed antioxidant, the maximum dosage is. It can also be used in cosmetics. Orally administered to rats. Food, fats, oils, Antioxidant for ethers, emulsions, waxes, transformer oils, etc. The production method is obtained by esterification of gallic acid and propanol. Add gallic acid, propanol, benzene, sulfuric acid and p-toluenesulfonic acid to a glass-lined reaction pot and heat Dehydrate, recover benzene and place. Pour into water and place again. Filter to obtain crude product. Dissolve the crude product in ethanol and filter. Add the filtrate to water for crystallization. Filter and dry to obtain the finished product.