Sodium benzoate, also known as sodium benzoin, is an organic compound and is the sodium salt of benzoic acid.The chemical formula is C7H5O2Na, sodium benzoate is a white particle or crystalline powder, odorless or slightly benzoin odor, very soluble in water, the aqueous solution is slightly alkaline, slightly soluble in ethanol, soluble in glycerin and methanol, exposed to the air will absorb moisture.The reaction with acid will precipitate benzoic acid, the reaction with carbonate will produce bubbles, and it can also react with alkali and vitamin C.The industrial methods for preparing sodium benzoate are benzoic acid method and toluene method.Sodium benzoate is commonly used as a preservative, corrosion inhibitor, etc., and is widely used in water treatment, food, medicine and other fields.Specifically, it is often used as a corrosion inhibitor in the field of water treatment, which is used to protect iron-containing metals, but needs to be used in combination with other water treatment agents; in the food field, it is often used for anticorrosion and preservation, inhibiting microbial growth, and maintaining food flavor and nutrition; in the pharmaceutical field, it is often used as preservatives, such as syrups, eye drops, etc., to prevent microbial pollution; in the industrial field, it is often used for anticorrosion and stability, used in coatings, plastics and other industrial products.

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Application Description

Sodium benzoate is an acidic preservative in the field of food anticorrosion. It has no bactericidal or antibacterial effects in alkaline media. The optimal pH for anticorrosion is 2.5~4.0.Sodium benzoate is commonly used in the preservation of highly acidic fruits, berries, fruit juices, jams, beverage syrups and other acidic foods, and can be used in conjunction with low-temperature sterilization methods to play a complementary role.The method of use is generally to dissolve sodium benzoate with an appropriate amount of water, then add it to the food and stir well.
(1) Beverages: Widely used in acidic beverages, such as carbonated beverages, fruit juices, functional beverages, flavored water and iced tea.Sodium benzoate can effectively prevent microbial pollution and enable beverages to maintain a long shelf life in an acidic environment.
(2) Jam and jelly: Sodium benzoate is used to extend the shelf life of jam and jelly and prevent mold growth, especially if it needs to be stored for a long time after opening.
(3) Pickled foods: for example, pickled cucumbers, kimchi, chili and other pickled foods, sodium benzoate can effectively prevent excessive fermentation of lactic acid bacteria and other microorganisms in food.
(4) Seasonings: Including acidic seasonings such as soy sauce, ketchup, salad dressing and chili sauce, sodium benzoate can ensure that the seasonings do not deteriorate during long-term storage.
(5) Baked goods: Sodium benzoate is also used in some baked products, such as packaging cakes, pies and fillings, to prevent products from spoiling due to microorganisms.
Sodium benzoate is widely used as a preservative in food processing and preservation, but it is used in limited quantities in some foods in some countries.Since benzoic acid can play a role in the free state in food, it has a better effect in strongly acidic foods.Benzoic acid is generally used in carbonated beverages, soy sauce, sauces, candied fruits and fruit and vegetable beverages. Benzoic acid can be used with p-hydroxybenzoates in soy sauce and beverages to increase efficiency.Benzoic acid and sodium benzoate are commonly used in the preservation of highly acidic fruits, jams, beverage syrups and other acidic foods. They can be combined with low-temperature sterilization and play a synergistic role.
In the field of medicine: Sodium benzoate is also widely used as a preservative, mainly used in liquid pharmaceutical preparations to ensure the stability of the drug and prevent microbial contamination.
(1) Syrups and oral solutions: Sodium benzoate is used in pharmaceutical syrups and oral solutions to extend its shelf life and inhibit the growth of microorganisms.
(2) Topical medicine: Sodium benzoate is also used in certain skin topical preparations as an anticorrosive ingredient to help maintain the stability and safety of the preparations.
(3) Injections and eye potions: Although the application of sodium benzoate in injections is limited, it can be used in some eye potions to ensure that the potions are not contaminated by microorganisms, especially in products that are used multiple times.
Personal care products: Sodium benzoate as a preservative is very common in cosmetics and personal care products: lotions and toners: prevent the growth of bacteria and mold, and maintain product hygiene.Shampoo, cleanser and mouthwash: ensure safe use by preventing microbial contamination.
Industrial application: The application of sodium benzoate in the industrial field includes as an anticorrosive agent, lubricant additive and rust inhibitor: anticorrosive agent: used in coolant and antifreeze to prevent metal surface corrosion.Lubricants and rust inhibitors: As additives, they play a role in preventing oxidation and rust.