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Bio-production of a Polyalcohol (Xylitol) from Lignocellulosic Resources: A Review

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:   No Citation available.
Authors:   M Soleimani, L Tabil, S Panigrahi
Keywords:   Xylitol, xylose, lignicellulose, lignocellulosic hydrolyzates, fermentation, hemicellulose

Lignocellulosic materials being supplied from a variety of resources at low price can be used as feedstock for chemicals and bio-products. Xylitol is a high value polyalcohol produced by the reduction of D-xylose (from hemicellulose fraction of lignocellulose) and is employed in food and pharmaceutical industries. The large number of advantageous properties, such as its low-calorie sweetening power and anticariogenicity justifies the high industrial interest for xylitol. Biotechnological production of this substance is lately becoming more attractive than the chemical method of catalytic hydrogenation due to the higher yield and because downstream processing is expected to be less costly. Studies about the bio-production of xylitol, in which microorganisms or enzymes are involved as catalysts to convert xylose into xylitol under mild conditions of pressure and temperature, have been mostly focused on establishing the operational parameters and the process options that maximize its yield and productivity in free cell system. However, some gaps in knowledge exist regarding this bioconversion process in immobilized cell system and selection or making an appropriate carrier (support) for biocatalysts in fermentation medium.

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