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Xylitol crystals.jpg
Xylitol crystals
Systematic IUPAC name
Other names
(2R,3r,4S)-Pentane-1,2,3,4,5-pentaol (not recommended)
87-99-0 YesY
ChemSpider 6646 N
ECHA InfoCard 100.001.626
Jmol 3D model Interactive image
PubChem 6912
Molar mass 152.15 g·mol−1
Density 1.52 g/cm3
Melting point 92 to 96 °C (198 to 205 °F; 365 to 369 K)
Boiling point 345.39 °C (653.70 °F; 618.54 K) Predicted value using Adapted Stein & Brown method[2]
~ 0.1 g/mL
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 1: Exposure would cause irritation but only minor residual injury. E.g., turpentine 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
Related compounds
Related alkanes
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
Infobox references

Xylitol /ˈzltɒl/ is a sugar alcohol used as a sweetener. The name derives from Greek: ξύλον, xyl[on], "wood" + suffix -itol, used to denote sugar alcohols. Xylitol is categorized as a polyalcohol or sugar alcohol (alditol). It has the formula CH2OH(CHOH)3CH2OH and is an achiral[3] isomer of pentane-1,2,3,4,5-pentol. Unlike other natural or synthetic sweeteners, xylitol is actively beneficial for dental health by reducing caries (cavities) to a third in regular use and helpful to remineralization.[4] Multiple studies utilizing electron microscopy have indicated that xylitol is effective in inducing remineralization of deeper layers of demineralized enamel.[5][6] Fair evidence was found that xylitol (as chewing gum, lozenges, nasal spray, etc.) reduced the incidence of acute middle ear infection in healthy children.[7]

Xylitol is naturally found in low concentrations in the fibers of many fruits and vegetables, and can be extracted from various berries, oats, and mushrooms, as well as fibrous material such as corn husks and sugar cane bagasse.[8][9][10] However, industrial production starts from xylan (a hemicellulose) extracted from hardwoods[11] or corncobs, which is hydrolyzed into xylose and catalytically hydrogenated into xylitol. A study in laboratory rats that compared xylitol to other artificial sweeteners found that xylitol had fewer or no side effects, had fewer calories, and was less likely to cause cavities (that is, had lower cariogenicity) than sucrose (table sugar).[12]


Xylitol is produced by hydrogenation of xylose, which converts the sugar (an aldehyde) into a primary alcohol. Another method of producing xylitol is through microbial processes, including fermentative and biocatalytic processes in bacteria, fungi, and yeast cells, that take advantage of the xylose-intermediate fermentations to produce high yield of xylitol.[13] Common yeast cells used in effectly fermenting and producing xylitol are Candida tropicalis and Candida guilliermondii.[14]


One gram of xylitol contains 2.43 kilocalories (kcal),[15] as compared to one gram of sugar, which has 3.87 kcal.[16] Xylitol has virtually no aftertaste, and is advertised as "safe for diabetics and individuals with hyperglycemia." This tolerance is attributed to the lower effect of xylitol on a person's blood sugar, compared to that of regular sugars as it has an extremely low glycemic index of 7 (glucose has a GI of 100).[17]

Health benefits[edit]

Dental care[edit]

Xylitol is a "tooth-friendly", nonfermentable sugar alcohol.[18][19] It appears to have more dental health benefits than other polyalcohols.[20] The structure of xylitol contains a tridentate ligand, (H-C-OH)3 that can rearrange with polyvalent cations like Ca2+. This interaction allows Ca2+ to be transported through the gut wall barrier and through saliva which may allow enamel to remineralize before dental cavities form.[21]

Early studies from Finland in the 1970s found, compared with chewing sucrose-sweetened gum, xylitol resulted in nearly two fewer cavities or missing teeth.[22] Cavity-causing bacteria prefer six-carbon sugars or disaccharides, while xylitol is non-fermentable and cannot be used as an energy source - while still being taken up into the cell (due to similar shape) and interfering with bacterial growth and reproduction. The harmful micro-organisms are starved in the presence of xylitol, allowing the mouth to remineralize damaged teeth with less interruption. This same property renders it unsuitable for making bread as it interferes with the ability of yeast to digest sugars.[21] At least six grams of xylitol per day, in three to five chewing episodes, is thought to be needed for dental efficacy. A source of xylitol that releases it slowly, and a one- to three-minute initial pulse are thought to improve the dental effect.[21]

Xylitol also inhibits the growth of Streptococcus pneumoniae, as well as the attachment of Haemophilus influenzae on the nasopharyngeal cells.[21]

The perception of sweetness obtained from consuming xylitol causes the secretion of saliva which acts as a buffer against the acidic environment created by the microorganisms in dental plaque. Increase in salivation can raise the falling pH to a neutral range within few minutes of xylitol consumption.[23]

However, despite these promising conjectures two systematic reviews of clinical trials could not find conclusive evidence that xylitol was indeed superior to other polyols such as sorbitol[24] or equal to that of topical fluoride in its anti-caries effect.[25]

In the 33-month Xylitol for Adult Caries Trial, participants were given lozenges of either five grams of xylitol or a sucralose-sweetened placebo. While this study initially found no statistically significant reduction in 33-month caries increment among adults at an elevated risk of developing caries,[26] a further examination of data from this study revealed a significant reduction in the incidence of root caries in the group that received xylitol.[27]

In March, 2015, Cochrane published a review[28] of the entire body of evidence surrounding xylitol's effects on dental caries. Their conclusion was that, while low-quality evidence suggests that over 2.5 to 3 years of use, a fluoride toothpaste containing xylitol may reduce caries when compared to a fluoride-only toothpaste, the remaining body of evidence is of low to very low quality and is insufficient to determine whether any other xylitol-containing products can prevent caries in infants, older children, or adults.

Xylitol is categorized by the U.S. Food and Drug Administration as a food additive.[29] Like other sugar alcohol-sweetened products, xylitol-sweetened products are allowed to be labeled with the claim that they do not promote dental cavities.


Possessing approximately 33% fewer calories, xylitol is a lower-calorie alternative to table sugar. Absorbed more slowly than sugar, it does not contribute to high blood sugar levels or the resulting hyperglycemia caused by insufficient insulin response. This characteristic has also proven beneficial for people suffering from metabolic syndrome, a common disorder that includes insulin resistance, hypertension, hypercholesterolemia, and an increased risk for blood clots.[30] Xylitol is used as a sweetener in medicines, chewing gum and pastilles.[31]

Source of energy[edit]

In the human gut xylitol is not absorbed as well as glucose or fructose; the unabsorbed xylitol acts as a dietary soluble fiber in helping to maintain certain aspects of gut function. Bacterial fermentation, mainly in the large gut, partly converts xylitol to short-chain fatty acids that the gut can absorb as fuel for energy production in oxidative metabolic pathways. Xylitol also is useful in recovery after heavy exercise because the human body converts absorbed xylitol to glucose 6-phosphate and glycogen. The conversion is however slow, so that the xylitol amounts to a low-GI source of energy.[32][33]

Ear infection[edit]

Xylitol chewing gum appears to decrease rates of acute otitis media in children going to daycare by 25%.[34] Xylitol nasal sprays have also been shown to decrease incidence of acute otitis media as well as being a very effective way of both assisting and stimulating the body's own natural nasopharyngeal washing, and reducing both bacterial colonization and allergenic pollution, with their accompanying problems.[35]


A feed containing Xylitol increased bone volume in rat studies conducted in 2001 and 2011, these results have generated interest in the sugar that would examine if it could be a human treatment for osteoporosis.[36][37][38]


In humans[edit]

Xylitol has no known toxicity in humans, however, some report heart palpitations after consuming it. In one study, participants consumed a monthly average of 1.5 kg of xylitol with a maximum daily intake of 430 g with no apparent ill effects.[39] Like most sugar alcohols, xylitol has a laxative effect because sugar alcohols are not fully broken down during digestion; however, the effect varies from person to person. In one study of 13 children, four experienced diarrhea from xylitol's laxative effect when they ate more than 65 grams per day.[40] Studies have reported that adaptation occurs after several weeks of consumption.[40]

As with other sugar alcohols, with the exception of erythritol, consumption of xylitol in excess of one's "laxation threshold" (the amount of sweetener that can be consumed before abdominal discomfort occurs) can result in temporary gastrointestinal side effects, such as bloating, flatulence, and diarrhea. Adaptation (that is, an increase of the laxation threshold) occurs with regular intake. Xylitol has a lower laxation threshold than some sugar alcohols, but is more easily tolerated than mannitol and sorbitol.[40][41]

In dogs[edit]

Xylitol is often fatal to dogs. According to the ASPCA Animal Poison Control Center, the number of cases of xylitol toxicosis in dogs has significantly increased since the first reports in 2002. Dogs that have eaten foods containing xylitol (greater than 100 milligrams of xylitol consumed per kilogram of bodyweight) have presented with low blood sugar (hypoglycemia), which can be life-threatening.[42] Low blood sugar can result in a loss of coordination, depression, collapse and seizures in as little as 30 minutes.[43] Intake of doses of xylitol (greater than 500 – 1000 mg/kg bwt) has been implicated in liver failure in dogs, which can be fatal.[44] The possible cause of hypoglycemia experienced by dogs is that xylitol in chewing gum is released more slowly and absorbed over longer period than when it is consumed as a pure form.[45][non sequitur]

In wild birds[edit]

A veterinarian examined the bodies of 30 Cape sugarbirds that had died within 30 minutes of drinking a solution made with xylitol, from a feeder in a garden in Hermanus, South Africa.[46]

See also[edit]


  1. ^ Safety data sheet for xylitol from Fisher Scientific. Retrieved 2014-11-02.
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  3. ^ Wrolstad, Ronald E. (2012). Food Carbohydrate Chemistry. John Wiley & Sons. p. 176. ISBN 9780813826653. Retrieved October 20, 2012. Xylitol contains asymmetric carbon atoms, but it is not chiral because the molecule as a whole is symmetrical. 
  4. ^ Steinberg, LM; Odusola, F; Mandel, ID (Sep–Oct 1992). "Remineralizing potential, antiplaque and antigingivitis effects of xylitol and sorbitol sweetened chewing gum.". Clinical preventive dentistry. 14 (5): 31–4. PMID 1291185. Retrieved 13 November 2013. 
  5. ^ Miake Y, et al. "Remineralization effects of xylitol on demineralized enamel.". nih.gov. Retrieved 12 July 2015. 
  6. ^ http://www.drellie.com/pdfs/The-Remineralization-effects-of-XYLITOL.pdf
  7. ^ Azarpazhooh, A.; Limeback, H.; Lawrence, H. P.; Shah, P. S. (2011). Azarpazhooh, Amir, ed. "Xylitol for preventing acute otitis media in children up to 12 years of age". The Cochrane Library (11): CD007095. doi:10.1002/14651858.CD007095.pub2. PMID 22071833. 
  8. ^ Gare, Fran (February 1, 2003). The Sweet Miracle of Xylitol. Basic Health Publications, Inc. ISBN 1-59120-038-5. 
  9. ^ Rao, R. Sreenivas; Jyothi, Ch. Pavana; Prakasham, RS; Sharma, PN; Rao, L. Venkateswar (2006). "Xylitol production from corn fiber and sugarcane bagasse hydrolysates by Candida tropicalis". Bioresour. Technol. 97: 1974–8. doi:10.1016/j.biortech.2005.08.015. PMID 16242318. [verification needed]
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  11. ^ Converti, Atillio; Parego, Patrizia; Dominguez, Jose Manuel (1999). "Xylitol Production from Hardwood Hemicellulose Hydrosylates" (PDF). Applied Biochemistry and Biotechnology. 82: 141–151. doi:10.1385/abab:82:2:141. 
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  16. ^ "Sugars, granulated (sucrose)". Self Nutrition Data. Retrieved March 14, 2012.  With a serving size of 100 grams, there are 387 calories.
  17. ^ The American Journal of Clinical Nutrition, January 1, 2002: International table of glycemic index and glycemic load values Retrieved 2012-08-26
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  21. ^ a b c d Reusens, B. (2004). Remacle, Claude; Reusens, Brigitte, eds. Functional foods, ageing and degenerative disease. Cambridge, England: Woodhead Publishing. p. 202. ISBN 978-1-85573-725-9. Retrieved March 14, 2012. 
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  29. ^ "CITE: 21CFR172.395". Code of Federal Regulations Title 21. United States Food and Drug Administration. 2012-04-01. 
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