Sodium Benzoate

Sodium benzoate (E211), also called benzoate of soda. It is the sodium salt of benzoic acid and exists in this form when dissolved in water. It can be produced by reacting sodium hydroxide with benzoic acid. Sodium benzoate is used as a preservative. It is not bactericidal, only bacteriostatic. It has fungistatic activity. It is effective only in acidic conditions when the pH level is 3.6 or below. This makes its used most commonly in foods such as preserves, salad dressings (vinegar), carbonated drinks (carbonic acid), jams (citric acid), fruit juices (citric acid), pickles (vinegar), and Chinese food sauces (soy, mustard, and duck). It is also found in alcohol-based mouthwash and silver polish. Sodium benzoate is used in many soft drinks and can be identified on the label of the bottle or can as 'sodium benzoate' or E211.

The taste of sodium benzoate cannot be detected by around 25 percent of the population, but for those who can taste the chemical it tends to be perceived as sweet, salty, or sometimes bitter.

It is found naturally in cranberries, prunes, greengage plums, cinnamon, ripe cloves, and apples. Concentration as a preservative is limited by the FDA in the U.S. to 0.1% by weight though organically-grown cranberries and prunes can conceivably contain levels exceeding this limit. The International Program on Chemical Safety found no adverse effects in humans at doses of 647-825 mg/kg of body weight per day.

Sodium benzoate, as well as benzoic acid are completely SAFE and have been labeled GRAS (generally recognized as safe) by the FDA (US Food and Drug Administration). In 1954 Dr. W.H. Stein reported in the Journal of the American Chemical Society that benzoate is a natural metabolite of the human body. It is a substance natural to the body's own metabolism, and in this respect is no difference in its functioning as a preservative than vinegar (acetic acid). Sodium Benzoate has been used by food manufacturers for over 80 years to inhibit microbial growth.

References:
Wikipedia

 

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