02606nas a2200301 4500008004100000022001400041245005400055210005200109260009800161300001200259490000600271520165300277653002001930653002101950653001301971653001801984653003802002653001102040100002402051700001802075700002102093700002002114700001902134700002202153700002102175700001902196856008902215 2008 eng d a1932-104X00aFurfural: hemicellulose/xylosederived biochemical0 aFurfural hemicellulosexylosederived biochemical aTHE ATRIUM, SOUTHERN GATE, CHICHESTER PO19 8SQ, W SUSSEX, ENGLANDbJOHN WILEY & SONS LTDcSEP a438-4540 v23 a

Hemicellulose, the second, most common polysaccharide in nature constitutes approximately 20-35% of lignocellulosic biomass. Effective utilization of biomass, hitherto underutilized, is gaining tremendous importance for the production of energy, fuels, and chemicals. Amongst the vast array of chemicals derived from lignocellulosics, furfural is the key chemical that finds wide applications in oil refining, plastics, pharmaceutical and agrochemical industries. There is no synthetic route for the production of furfural. A few conventional technologies currently in practice for its separation and subsequent isolation are appropriately reviewed. Major disadvantages associated with processes currently used for the production of furfural based on acid-catalyzed hydrolysis have been discussed. A need to develop a process which is devoid of all the shortcomings associated with conventional process is emphasized. Several important aspects of chemistry underlying the acid hydrolysis of xylose are discussed. The importance of myriad pre-treatment steps involved to surmount the physical and chemical barriers and to liberate xylose from the confines of acid-resistant layer of lignin has been emphasized. New developments in the production of furfural from cyclodehydration of xylose using solid acid catalysts in the recent past have been reviewed appropriately in present communication. Finally, the production of furfural and furfuryl alcohol, their domestic market and export in China deserve some coverage and therefore have appropriately been discussed as well. (c) 2008 Society of Chemical Industry and John Wiley & Sons, Ltd

10aacid hydrolysis10acyclodehydration10afurfural10aHemicellulose10apre-treatment of lignocellulosics10aXylose1 aMamman, Ajit, Singh1 aLee, Jong-Min1 aKim, Yeong-Cheol1 aHwang, In, Taek1 aPark, No-Joong1 aHwang, Young, Kyu1 aSan Chang, Jong-1 aHwang, Jin-Soo uhttps://library.ncl.res.in/content/furfural-hemicellulosexylosederived-biochemical-002101nas a2200253 4500008004100000022001400041245015000055210006900205260009900274300001400373490000800387520111000395653001901505653003601524653004101560653001201601653001101613100001801624700002301642700002101665700002001686700001401706856012701720 2011 eng d a0960-852400aMicrobial production of xylitol from D-xylose and sugarcane bagasse hemicellulose using newly isolated thermotolerant yeast Debaryomyces hansenii0 aMicrobial production of xylitol from Dxylose and sugarcane bagas aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcFEB a3304-33080 v1023 a

A thermotolerant yeast capable of fermenting xylose to xylitol at 40 C was isolated and identified as a strain of Debaryomyces hansenii by ITS sequencing. This paper reports the production of xylitol from D-xylose and sugarcane bagasse hemicellulose by free and Ca-alginate immobilized cells of D. hansenii. The efficiency of free and immobilized cells were compared for xylitol production from D-xylose and hemicellulose in batch culture at 40 degrees C. The maximum xylitol produced by free cells was 68.6 g/L from 100 g/L of xylose, with a yield of 0.76 g/g and volumetric productivity 0.44 g/L/h. The yield of xylitol and volumetric productivity were 0.69 g/g and 0.28 g/L/h respectively from hemicellulosic hydrolysate of sugarcane bagasse after detoxification with activated charcoal and ion exchange resins. The Ca-alginate immobilized D. hansenii cells produced 73.8 g of xylitol from 100 g/L of xylose with a yield of 0.82 g/g and volumetric productivity of 0.46 g/L/h and were reused for five batches with steady bioconversion rates and yields. (C) 2010 Elsevier Ltd. All rights reserved.

10aImmobilization10aSugarcane bagasse hemicellulose10aThermotolerant Debaryomyces hansenii10axylitol10aXylose1 aPrakash, Gyan1 aVarma, Anjanikumar1 aPrabhune, Asmita1 aShouche, Yogesh1 aRao, Mala uhttps://library.ncl.res.in/content/microbial-production-xylitol-d-xylose-and-sugarcane-bagasse-hemicellulose-using-newly-002312nas a2200265 4500008004100000022001400041245012600055210006900181260006700250300001400317490000800331520140600339653002501745653001801770653001301788653001501801653001201816653001101828653001001839100001401849700001601863700001601879700002201895856012901917 2013 eng d a1364-507200aXylitol production by cyberlindnera (Williopsis) saturnus, a tropical mangrove yeast from xylose and corn cob hydrolysate0 aXylitol production by cyberlindnera Williopsis saturnus a tropic a111 RIVER ST, HOBOKEN 07030-5774, NJ USAbWILEY-BLACKWELLcDEC a1357-13670 v1153 a

AimPotential for xylitol production from xylose and corn cob hydrolysate by a tropical mangrove yeast. Methods and ResultsIn the present study, 21 fungi were isolated from detritus-based mangrove wetlands along the Indian west coast. Of these, one yeast isolate had the ability to grow and assimilate xylose producing significant amounts of xylitol (3863gl(-1)). A maximum yield of 054gg(-1) was obtained after 144h of growth on xylose (150gl(-1)) and corn cob hydrolysate (CCH, containing 65gl(-1) xylose). Using biochemical and molecular methods, the yeast was identified as Cyberlindnera (Williopsis) saturnus. Preliminary characterization of enzymes in the cell-free extract revealed that while xylose reductase (XR) preferred NADPH to NADH as cofactor, xylitol dehydrogenase (XDH) was NAD specific. ConclusionsSignificant amounts of xylitol could be produced on CCH using C.saturnus isolated from tropical mangrove wetlands. The yeast has the potential to assimilate rather than ferment xylose as its XR has a preference for NADPH. Significance and Impact of the StudyMicrobes offer an economically viable and green approach for production of xylitol, an industrially important compound. A mangrove ecosystem with its battery of lignocellulolytic enzymes is an ideal location for isolating fungi capable of producing xylitol from agroindustrial waste such as CCH.

10acorn cob hydrolysate10aCyberlindnera10amangrove10aWilliopsis10axylitol10aXylose10aYeast1 aKamat, S.1 aGaikwad, S.1 aKumar, Ravi1 aGade, Wasudeo, N. uhttps://library.ncl.res.in/content/xylitol-production-cyberlindnera-williopsis-saturnus-tropical-mangrove-yeast-xylose-and-001902nas a2200217 4500008004100000022001400041245009300055210006900148260007300217300001000290490000800300520114400308653001201452653001301464653001801477653001201495653001101507100002301518700002901541856011401570 2015 eng d a0920-586100aEffects of careful designing of SAPO-44 catalysts on the efficient synthesis of furfural0 aEffects of careful designing of SAPO44 catalysts on the efficien aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcAUG a66-720 v2513 a

Considering the growing importance of furfural, it is necessary to develop a robust solid acid catalyst for the conversion of xylan (hemicelluloses) into furfural in a one-pot method. In this study, the effects of various components (Si, Al and P) and crystallization time on the preparation of acidic materials and their properties are extensively described. It is seen that with the increase in crystallization time (0, 48, 96, 176 h) during the synthesis of silicoaluminophosphate (SAPO-44), materials morphology changes from amorphous to AFI to CHA and the best activity for furfural synthesis (82%) from xylan was observed with SAPO-44 catalyst aged for 176 h. Since, acidity in the SAPO-44 is guided by the incorporation of Si in the ALPO framework, study on Si molar concentration (0.8, 1.0, 1.2, 1.4 and 1.6) in SAPO-44 was carried out and it was observed that SAPO-44 having 1.0 mole of Si content is the best catalyst for the xylan/xylose conversion to furfural. Catalyst structure-activity correlation is thoroughly defined with the help of several physico-chemical properties. (C) 2014 Elsevier B.V. All rights reserved.

10aBiomass10afurfural10aHemicellulose10aSAPO-4410aXylose1 aBhaumik, Prasenjit1 aDhepe, Paresh, Laxmikant uhttps://library.ncl.res.in/content/effects-careful-designing-sapo-44-catalysts-efficient-synthesis-furfural-002112nas a2200265 4500008004100000022001400041245016200055210006900217260000800286300001100294490000800305520120000313653001301513653002101526653001101547653001601558653002301574653001101597100001901608700002601627700002401653700002001677700001801697856013101715 2020 eng d a0961-953400aMaximization of furanic compounds formation by dehydration and hydrogenation of xylose in one step over SO3-H functionalized H-beta catalyst in alcohol media0 aMaximization of furanic compounds formation by dehydration and h cAUG a1056460 v1393 a

Furanic compounds such as furfural (FUR); furfuryl alcohol (F. Alc) are important renewable platform chemicals can be used as such or further convert for preparation of other value added products such as Levulinic acid (LA), Alkyl Levulinates, 2-Methyltetrahydrofuran (MTHF), and Tetrahydrofuran (THF) etc. Sulfonated H-beta zeolite was successfully prepared and used for the synthesis of furanic compounds especially FUR and F. Alc from c-xylose in one step using isopropanol as alcohol media. Prepared catalyst was well characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), BET, NH3-Temperature programmed desorption (TPD) and carbon-hydrogen-nitrogen-sulfur analysis (CHNS). It was found the total acid amount was increased with increase in sulfur loading which confirmed the sulfonic acid group (SO3-H) was successfully grafted onto zeolite structure. 3 wt% H-beta-SO3-H catalyst with optimized reaction parameters of 150 degrees C, 7 h, 25 wt% catalyst loading was tuned to get the highest furanic compound yield of 88.5% (FUR 76.8% + F.Alc 11.7%).The reusability study confirmed that there was a marginal drop of similar to 25% after 3 recycle runs.

10afurfural10aFurfuryl alcohol10aH-beta10aisopropanol10asulfonated zeolite10aXylose1 aGupta, Anshita1 aNandanwar, Sachin, U.1 aNiphadkar, Prashant1 aSimakova, Irina1 aBokade, Vijay uhttps://library.ncl.res.in/content/maximization-furanic-compounds-formation-dehydration-and-hydrogenation-xylose-one-step-over