Benzoic acid
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Benzoic acid

Benzoic acid has the effect of sterilizing and inhibiting the growth of bacteria, and is low-toxic and tasteless, so it is widely used as a preservative.



Benzoic acid used as preservatives in food and drinks to prevent the growth of mold, yeast and fungi. In general the salts are preferred over the acid form because they are more soluble in water. The optimal pH for the antimicrobial activity is below pH 6.5 and sorbates are generally used at concentrations of 0.025% to 0.10%. Adding sorbate salts to food will however raise the pH of the food slightly so the pH may need to be adjusted to assure safety.

ItemSpecificationTest result
AppearanceColorless crystals or white crystalline powderConforms
Melting Point121-124℃123.0℃
Sulfate Ash0.1%Max0.08%
Loss on drying0.5%Max0.16%
Carbonizable substanceY5Y5
Heavy metals10ppm max7ppm
Chloride200ppm max150ppm max
Residue on ignition0.1%max0.07%max

Functions and Applications

In the food industry, benzoic acid and sodium benzoate can be used as preservatives for soy sauce, pickles, apple cider, fruit juice, feed, etc. In drugs, cosmetics, toothpaste, fragrant powder, tobacco leaves, etc., benzoic acid and sodium benzoate are also used as preservatives.

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