Potassium sorbate

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Potassium sorbate[1][2]
The structure of potassium sorbate
Potassium sorbate ball-and-stick.png
IUPAC name
Potassium (2E,4E)-hexa-2,4-dienoate
Other names
Sorbistat potassium
24634-61-5 YesY
ChemSpider 4445644 YesY
Jmol interactive 3D Image
KEGG D02411 YesY
PubChem 23676745
Molar mass 150.22 g·mol−1
Appearance White crystals
Odor yes
Density 1.363 g/cm3
Melting point 270 °C (518 °F; 543 K) (decomposes)
58.5 g/100 mL (100 °C)
Solubility in other solvents Soluble in ethanol, propylene glycol
Slightly soluble in acetone
Very slightly soluble in chloroform, corn oil, ether
Insoluble in benzene
NFPA 704
Flammability code 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g., canola oil Health code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroform Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Lethal dose or concentration (LD, LC):
4340 mg/kg (oral, rat)[3]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references


Potassium sorbate is the potassium salt of sorbic acid, chemical formula CH3CH=CH-CH=CH-CO2K. It is a white salt that is very soluble in water (58.2% at 20 °C). It is primarily used as a food preservative (E number 202).[4] Potassium sorbate is effective in a variety of applications including food, wine, and personal care products. While sorbic acid is naturally occurring in some berries, virtually all of the world's production of sorbic acid, from which potassium sorbate is derived, is manufactured synthetically.


Potassium sorbate is produced industrially by neutralizing sorbic acid with potassium hydroxide. The precursor sorbic acid is produced in a two-step process via the condensation of crotonaldehyde and ketene.[5][6][7]


Potassium sorbate is used to inhibit molds and yeasts in many foods, such as cheese, wine, yogurt, dried meats, apple cider, soft drinks and fruit drinks, and baked goods.[8] It is used in the preparation of items such as maple syrup and milkshakes served by fast food restaurants such as McDonalds.[9][10] It can also be found in the ingredients list of many dried fruit products. In addition, herbal dietary supplement products generally contain potassium sorbate, which acts to prevent mold and microbes and to increase shelf life. It is used in quantities at which there are no known adverse health effects, over short periods of time.[11] Labeling of this preservative on ingredient statements reads as "potassium sorbate" or "E202". Also, it is used in many personal care products to inhibit the development of microorganisms for shelf stability. Some manufacturers are using this preservative as a replacement for parabens. Tube feeding of potassium sorbate reduces gastric burden of pathogenic bacteria.[12]

Also known as "wine stabilizer", potassium sorbate produces sorbic acid when added to wine. It serves two purposes. When active fermentation has ceased and the wine is racked for the final time after clearing, potassium sorbate will render any surviving yeast incapable of multiplying. Yeast living at that moment can continue fermenting any residual sugar into CO2 and alcohol, but when they die no new yeast will be present to cause future fermentation. When a wine is sweetened before bottling, potassium sorbate is used to prevent refermentation when used in conjunction with potassium metabisulfite. It is primarily used with sweet wines, sparkling wines, and some hard ciders but may be added to table wines which exhibit difficulty in maintaining clarity after fining.

Some molds (notably some Trichoderma and Penicillium strains) and yeasts are able to detoxify sorbates by decarboxylation, producing piperylene (1,3-pentadiene). The pentadiene manifests as a typical odor of kerosene or petroleum.[13]


Pure potassium sorbate is a skin, eye and respiratory irritant.[14]

Typical culinary usage rates of potassium sorbate are 0.025% to 0.1% (see sorbic acid),[citation needed] which in a 100 g serving yields an intake of 25 mg to 100 mg. The maximum acceptable daily intake for human consumption is 25 mg/kg, or 1750 mg daily for an average adult (70 kg).[11][15] Under some conditions, particularly at high concentrations or when combined with nitrites, potassium sorbate has shown genotoxic activity in vitro.[15]

Although some research implies it has a long-term safety record,[16] in vitro studies have shown that it is both genotoxic and mutagenic to human blood cells. Potassium sorbate is found to be toxic to human DNA in peripheral blood lymphocytes, and hence found that it negatively affects immunity.[17] It is often used with ascorbic acid and iron salts as they increase its effectiveness but this tends to form mutagenic compounds that damage DNA molecules.[18] Regardless, three studies have not found it to have any carcinogenic effects in rats.[19][20][21]

See also[edit]


  1. ^ Merck Index, 11th Edition, 7661.
  2. ^ Potassium sorbate at Sigma-Aldrich
  3. ^ http://chem.sis.nlm.nih.gov/chemidplus/rn/590-00-1
  4. ^ Nordic Food Additive Database Nordic Working Group on Food Toxicology and Risk Assessment
  5. ^ Erich Lück, Martin Jager and Nico Raczek "Sorbic Acid" in Ullmann's Encyclopedia of Industrial Chemistry, 2011, Wiley-VCH, Weinheim. doi:10.1002/14356007.a24_507.pub2
  6. ^ patent process for commercial potassium sorbate
  7. ^ CFNP TAP Review
  8. ^ Erich Lück, Martin Jager and Nico Raczek "Sorbic Acid" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2000.doi:10.1002/14356007.a24_507
  9. ^ "Ingredients - Vanilla Mc Shake". McDonalds USA. Retrieved 24 April 2014. 
  10. ^ "Nutrition Information". Mc Donalds UK. Retrieved 24 April 2014. 
  11. ^ a b "036. Sorbate, potassium (FAO Nutrition Meetings Report Series 40abc)". Inchem.org. Retrieved 2013-02-22. 
  12. ^ Tulamait, Aiman; Laghi, Franco; Mikrut, Kathleen; et al. (2005). "Potassium sorbate reduces gastric colonization in patients receiving mechanical ventilization". J Crit Care 20 (3): 281–287. doi:10.1016/j.jcrc.2005.03.002. PMID 16253799. 
  13. ^ The Soft Drinks Companion - A technical handbook for the beverage industry, Chapter 10
  14. ^ "Potassium Sorbate" (PDF). Chem One, Ltd. 2010-06-14. Retrieved 2015-05-04. 
  15. ^ a b Carocho, Márcio; Barreiro, Maria Filomena; Morales, Patricia; Ferreira, Isabel C.F.R. (2014). "Adding Molecules to Food, Pros and Cons: A Review on Synthetic and Natural Food Additives". Comprehensive Reviews in Food Science and Food Safety 13 (4): 377–399. doi:10.1111/1541-4337.12065. 
  16. ^ Tulamait, Aiman; Laghi, F; Mikrut, K; Carey, RB; Budinger, GR (2005). "Potassium sorbate reduces gastric colonization in patients receiving mechanical ventilization". J Crit Care 20 (3): 281–287. doi:10.1016/j.jcrc.2005.03.002. PMID 16253799. 
  17. ^ Mamur, Sevcan; Yüzbaşıoğlu, Deniz; Ünal, Fatma; Yılmaz, Serkan (2010). "Does potassium sorbate induce genotoxic or mutagenic effects in lymphocytes?". Toxicology in Vitro 24 (3): 790–4. doi:10.1016/j.tiv.2009.12.021. PMID 20036729. 
  18. ^ Kitano, K; Fukukawa, T; Ohtsuji, Y; Masuda, T; Yamaguchi, H (2002). "Mutagenicity and DNA-damaging activity caused by decomposed products of potassium sorbate reacting with ascorbic acid in the presence of Fe salt". Food and Chemical Toxicology 40 (11): 1589–94. doi:10.1016/S0278-6915(02)00119-9. PMID 12176085. 
  19. ^ Hendy, R J; Hardy, J; Gaunt, I F; Kiss, I S; Butterworth, K R (1976). "Long-term toxicity studies of sorbic acid in mice". Food and Cosmetics Toxicology 14 (5): 381–86. doi:10.1016/S0015-6264(76)80173-3. PMID 1010505. 
  20. ^ Gaunt, I F; Butterworth, K R; Hardy, J; Gangolli, S D (1975). "Long-term toxicity of sorbic acid in the rat". Food and Cosmetics Toxicology 13 (1): 31–45. doi:10.1016/0015-6264(75)90080-2. PMID 1123201. 
  21. ^ Mason, P L; Gaunt, I F; Hardy, J; Kiss, I S; Butterworth, K R; Gangolli, S D (1976). "Long-term toxicity of parasorbic acid in rats". Food and Cosmetics Toxicology 14 (5): 387–94. doi:10.1016/S0015-6264(76)80174-5. PMID 1010506.