Benzoic acid is a widely used preservative in the food industry. Here are some key points about its use:

Properties and Mechanism

• Chemical Formula: C₇H₆O₂
• Preservative Action: Benzoic acid inhibits the growth of mold, yeast, and some bacteria, extending the shelf life of food products. Its effectiveness is maximized in acidic conditions (pH < 4.5).

Sources and Uses

• Natural Sources: Benzoic acid occurs naturally in many foods such as cranberries, prunes, plums, cinnamon, ripe cloves, and most berries.
• Synthetic Sources: It is also manufactured synthetically and used in food processing.
• Common Foods: Soft drinks, fruit juices, pickles, salad dressings, sauces, and jams.

Safety and Regulations

• Acceptable Daily Intake (ADI): The ADI for benzoic acid, set by the Joint FAO/WHO Expert Committee on Food Additives (JECFA), is 0-5 mg/kg body weight.
• Regulatory Limits: Different countries have specific limits on the amount of benzoic acid allowed in foods. For instance, the FDA in the United States permits up to 0.1% in food products.

Health Considerations

• Allergic Reactions: Some individuals may experience allergic reactions, such as asthma, skin rashes, or other hypersensitivity reactions.
• Metabolism: Benzoic acid is metabolized by the body into hippuric acid, which is then excreted in the urine.

Labeling

• E Number: In the European Union, benzoic acid is labeled as E210 when used as a food additive.
• Ingredient Lists: It must be listed on ingredient labels when added to food products.