Detection of sorbic acid and benzoic acid

Sorbic acid, also known as refreshing tea acid, 2,4-hexadienoic acid, 2-propenylacrylic acid, with the molecular formula C6H8O2, is a food additive that has inhibitory effects on many fungi such as yeast and molds. It is also used in animal feed, cosmetics, pharmaceuticals, packaging materials, and rubber additives. Benzoic acid is an aromatic organic compound and the simplest aromatic acid, with the molecular formula C7H6O2. Originally made from benzoin gum, it is called benzoic acid. Melting point 122.13 ℃, boiling point 249.2 ℃, relative density (15/4 ℃) 1.2659. The appearance is white needle like or flake like crystals. It will sublimate above 100 ℃. Slightly soluble in cold water and hexane, soluble in hot water, ethanol, ether, chloroform, benzene, carbon disulfide, and turpentine. Benzoic acid is widely present in nature in the form of free acids, esters, or their derivatives. Mainly used for preparing sodium benzoate preservatives and for synthesizing drugs and dyes; It is also used in the production of plasticizers, mordants, fungicides, and spices. It can be obtained by direct oxidation of toluene in the presence of manganese dioxide; Alternatively, prepare phthalic anhydride by decarboxylation with water vapor

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