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Encyclopedia > Xylulose

Xylulose is a sugar (a monosaccharide), one of the pentose series of carbohydrates. It is a keto-pentose. In nature it occurs in the L- and D- form. A sugar is a form of carbohydrate used in the food and drinks industries, and important in biochemistry. ... Monosaccharides are carbohydrates in the form of simple sugars. ... A pentose is a monosaccharide with five carbon atoms. ...


L-xylulose is accumulated in the urin of pentosuria patients. Since L-xylulose is a reducing sugar like D-glucose, pentusuria patiens have been wrongly diagnosed in the past to be diabetic.


Image:DLxylulose.jpg


  Results from FactBites:
 
Patent 4490468: Production of ethanol by yeast using xylulose (2389 words)
Xylulose may be obtained commercially, but due to the relatively high cost, it is generally desirable to obtain the material by alternative sources.
The resulting xylulose containing material (initial fermentation substrate) after appropriate adjustment of pH and/or temperature if needed, is then fed to a fermentor vessel B containing the required fermentation yeast.
Upon reaching a maximum conversion level of xylulose to ethanol in the fermentation of Example Four, 25 gms of wet Actinoplanes cells were added to the fermentation mixture, so as to facilitate isomerization of remaining xylose to xylulose, and subsequent fermentation of xylulose to ethanol.
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