By Francisco M. Gírio, Florbela Carvalheiro, Luís C. Duarte, Rafał Bogel-Łukasik (auth.), Silvio Silvério da Silva, Anuj Kumar Chandel (eds.)
Commercially, D-xylitol is produced through chemical reactions which are adapted to the necessities of assorted sectors. although, as a result of the emerging curiosity in sustainable improvement and ecologically benign practices, microbial transformation tactics are as a rule most well-liked over the traditional chemical conversion technique. the previous have a number of benefits, together with much less chemical load at the atmosphere, better potency, and the power to dilute a number of downstream transformation makes an attempt whereas preserving product yield and restoration.
This e-book goals to disseminate the most up-tp-date advances within the biotechnological creation of D-xylitol and its functions in clinical and well-being care. it's a designated number of 15 e-book chapters break up into five sections and written by means of specialists of their respective fields, who current serious insights into a number of issues, evaluation present study, and talk about destiny development during this zone. This ebook additionally offers crucial details on hemicellulose hydrolysis to recuperate D-xylose, cleansing of hemicellulose hydrolysates, and stronger fermentation tools for elevated D-xylitol creation. The highlights of pressure development to extend the D-xylitol titers and downstream restoration of D-xylitol also are mentioned in different sections. the present purposes of D-xylitol in scientific and well-being care were used to justify the associated fee incurred for constructing the demonstration plant for D-xylitol creation out there. except researchers and post-graduate scholars within the box of microbial biotechnology, this publication will support these within the enterprise neighborhood who take care of the commercial research of bio-based items and their marketing.
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Additional info for D-Xylitol: Fermentative Production, Application and Commercialization
2003). Furthermore, it was found that the amount of dissolved hemicellulose rises with increasing temperature and time of the treatment. However, the hydrolyzed hemicellulose monomers undergo further degradation to furfural or HMF and other toxic by-products; therefore it should also be taken into account. The use of pure supercritical CO2 did not cause any significant change in microscopic morphology of wood (Ritter and Campbell 1991), but it can significantly increase cellulose hydrolysis (Kim and Hong 2001).
As a further drawback, there are the significant amounts of furfural that can also be produced, which implies a lower recovery of pentoses. 9 Enzymatic Hydrolysis The use of enzymes directly in the untreated biomass is not efficient, and hemicellulases are not an exception. Therefore, a pre-treatment as the ones described above are always necessary (Polizeli et al. 2005). 131 Xylan a-1,2(1 ? 136 Glucuronoarabinoxylan endo-1,4-b-xylanase Methylglucuronic acids Oligomers Linear or branched arabinans Xylose Isoprimeverosea b(1,3)-xylan Terminal b-1,3 (non-reducing end) (continued) High activity towards feruloylated arabinoxylans from cereal plant cell walls Acts best on linear 1,5-a-Larabinan.
Bioresour Technol 77:139–144 Kim SB, Lee YY (1986) Hydrolysis of hemicellulose by solid superacid. Biotechnol Bioeng Symp 15:81–90 Kim TH, Lee YY (2005) Pretreatment and fractionation of corn stover by ammonia recycle percolation process. Bioresour Technol 96:2007–2013 Kim TH, Lee YY (2006) Fractionation of corn stover by hot-water and aqueous ammonia treatment. Bioresour Technol 97:224–232 Kim TH, Kim JS, Sunwoo C, Lee YY (2003) Pretreatment of corn stover by aqueous ammonia. Bioresour Technol 90:39–47 Kim JS, Kim H, Lee JS, Lee JP, Park SC (2008) Pretreatment characteristics of waste oak wood by ammonia percolation.