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- W2120127122 abstract "Hemicellulosic hydrolyzates from vineshoot trimmings obtained by dilute sulfuric acid hydrolysis were evaluated for xylitol production by Debaryomyces hansenii NRRL Y-7426. Bioconversion was not efficient, however, since a mixture of products (mainly ethanol) was achieved. Taking into account that hexoses (such as glucose or mannose) can inhibit xylose metabolism by repression and inactivation of the xylose transport system or catabolic enzymes and that these hemicellulosic hydrolyzates are characterized by a high glucose concentration, a novel technology was developed, sequentially transforming glucose into lactic acid by Lactobacillus rhamnosus followed by fermentation of xylose into xylitol by Debaryomyces hansenii after L. rhamnosus removal by microfiltration. Optimal conditions were achieved using detoxified concentrated hemicellulosic hydrolyzates, after CaCO3 addition in both stages of fermentation and using nitrogen purges after sampling in order to reduce the oxygen dissolved. Under these conditions 31.5 g lactic acid L−1 (QLA = 1.312 g L−1 h−1 and YLA/S = 0.93 g g−1) and 27.5 g xylitol L−1 (QXylitol = 0.458 g L−1 h−1 and YXylitol/S = 0.53 g g−1) were produced. Finally, lactic acid was selectively recovered using the resin Amberlite IRA 400 (0.0374 g of lactic acid g−1 of dry resin), allowing a further recovery of xylitol by sequential stages of adsorption, concentration, ethanol precipitation, concentration and crystallization to obtain food-grade xylitol according to a developed process. Copyright © 2007 Society of Chemical Industry" @default.
- W2120127122 created "2016-06-24" @default.
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- W2120127122 date "2007-01-01" @default.
- W2120127122 modified "2023-09-27" @default.
- W2120127122 title "Simultaneous lactic acid and xylitol production from vine trimming wastes" @default.
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- W2120127122 doi "https://doi.org/10.1002/jsfa.2923" @default.
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