Effects of initial pH on biological synthesis of xylitol using xylose-rich hydrolysate.
Sugarcane bagasse, an agricultural residue plentiful in Brazil, was utilized for xylitol production by a biotechnological process. A medium fermentation prepared with this xylose-rich biomass at an oxygen transfer volumetric coefficient of 10/h1 and different initial pH values was inoculated with cells of Candida guilliermondii FTI 20037. The maximum values of xylitol and cell volumetric productivities (Qp = 0.56 g/[L.h] and Qx = 0.11 g/[g.h]), xylitol yield factor (YP/S = 0.79 g/g), and xylose uptake rate (qs = 0.197 g/[g.h]) were attained at pH 7.0 without further pH control. The results show that the yeast performance was influenced by the pH, an important bioengineering parameter in this fermentation process.
Morita
T A
TA
Biotechnology Department, Faculty of Chemical Engineering of Lorena, SP, Brazil.
Silva
S S
SS
Felipe
M G
MG
D001692:Biological Transport; D002175:Candida / Q000254:growth & development / Q000378:metabolism*; D002482:Cellulose; D003470:Culture Media; D005285:Fermentation; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D007700:Kinetics; D011134:Polysaccharides; D014993:Xylitol / Q000096:biosynthesis / Q000378:metabolism*; D014994:Xylose / Q000378:metabolism*
D003470:Culture Media; D011134:Polysaccharides; C007916:hemicellulose; D002482:Cellulose; C027433:bagasse; D014994:Xylose; D014993:Xylitol