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Sorbic Acid

Sorbic Acid

  • Sorbic acid, or 2,4-hexadienoic acid, is a natural organic compound used as a food preservative. It has the chemical formula CH3(CH)4CO2H.
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  • SPECIFICATIONS
  • Description
Sorbic acid, or 2,4-hexadienoic acid, is a natural organic compound used as a food preservative. It has the chemical formula CH3(CH)4CO2H. It is a colourless solid that is slightly soluble in water and sublimes readily. It was first isolated from the unripe berries of the Sorbus aucuparia (rowan tree), hence its name.

Properties and uses
Sorbic acid and its salts, such as sodium sorbate, potassium sorbate, and calcium sorbate, are antimicrobial agents often 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, but the active form is the acid. The optimal pH for the antimicrobial activity is below pH 6.5. 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. It is found in many other foods, such as cheeses and breads.

Specifications
Appearance White crystalline powder
Identification Conforms
Heat Stability Not change in color after heating for 90 minutes at 105°C
Odor Slight characteristic odor
Purity 99.0-101.0%
Water ≤0.5%
Melting Range (°C) 132-135
Residue on Ignition ≤0.2%
Aldehydes (as Formaldehyde) 0.1% Max
Lead (Pb) ≤5 mg/kg
Arsenic (As) ≤2 mg/kg
Mercury (Hg) ≤1 mg/kg
Heavy Metals (as Pb) ≤10 mg/kg

Sorbic acid structure
Sorbic Acid
The E numbers are:
E200 Sorbic acid
E201 Sodium sorbate
E202 Potassium sorbate
E203 Calcium sorbate

Some molds (notably some Trichoderma and Penicillium strains) and yeasts are able to detoxify sorbates by decarboxylation, producing trans-1,3-pentadiene. The pentadiene manifests as a typical odor of kerosene or petroleum. Other detoxification reactions include reduction to 4-hexenol and 4-hexenoic acid.

Sorbic acid can also be used as an additive for cold rubber, and as an intermediate in the manufacture of some plasticizers and lubricants.
Sorbic Acid

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