title: Batch xylitol production by Candida guilliermondii FTI 20037 from sugarcane bagasse hemicellulosic hydrolyzate at controlled pH values.
abstract: Batch fermentation of sugarcane bagasse hemicellulosic hydrolyzate by the yeast Candida guilliermondii FTI 20037 was performed using controlled pH values (3.5, 5.5, 7.5). The maximum values of xylitol volumetric productivity ( Q(p)=0.76 g/l h) and xylose volumetric consumption ( Q(s)=1.19 g/l h) were attained at pH 5.5. At pH 3.5 and 7.5 the Q(p) value decreased by 66 and 72%, respectively. Independently of the pH value, Y(x/s) decreased with the increase in Y(p/s) suggesting that the xylitol bioconversion improves when the cellular growth is limited. At the highest pH value (7.5), the maximum specific xylitol production value was the lowest ( q(pmax)=0.085 g/l h.), indicating that the xylose metabolism of the yeast was diverted from xylitol formation to cell growth.
authors: Department of Biotechnology, Faculty of Chemical Engineering of Lorena, PO Box 116, 12600-000, Lorena, SP, Brazil.
authors: R C L B
authors: RC
authors: Rodrigues
authors: M G A
authors: MG
authors: Felipe
authors: I C
authors: IC
authors: Roberto
authors: M
authors: M
authors: Vitolo
mesh_terms: D019149:Bioreactors / Q000382:microbiology*; D002175:Candida / Q000166:cytology / Q000254:growth & development / Q000378:metabolism*; D018929:Cell Culture Techniques / Q000379:methods*; D002455:Cell Division; D002482:Cellulose / Q000737:chemistry / Q000378:metabolism*; D003470:Culture Media / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D011134:Polysaccharides / Q000737:chemistry / Q000378:metabolism*; D031786:Saccharum / Q000378:metabolism*; D014993:Xylitol / Q000096:biosynthesis* / Q000302:isolation & purification; D014994:Xylose / Q000378:metabolism
chemical_list: D003470:Culture Media; D011134:Polysaccharides; C007916:hemicellulose; D002482:Cellulose; C027433:bagasse; D014994:Xylose; D014993:Xylitol