title: Evaluation of ion exchange resins for removal of inhibitory compounds from corn stover hydrolyzate for xylitol fermentation.
abstract: The use of dilute acids to catalyze the hydrolysis of hemicellulose to its sugar constituents is well-known and effective. However, a major problem associated with this pretreatment is the poor fermentability of the produced hydrolyzate as a result of the presence of the microorganism's inhibitory compounds. In the present work, seven ion-exchange resins were tested in order to detoxify corn stover hydrolyzate. Regarding xylose recovery, it was observed that more than 92% recovery was feasible. Furfural removal varied from 53.% to 99.%, and hydroxymethylfurfural (HMF) removal was effective between 37% and 100%. Acetic acid was totally removed by Purolite A 103 S resin. Corn stover hydrolyzate (CSH) treated with Purolite A 103 S, and Finex CS 14 GC resins, was tested as substrate for xylitol production using a yeast, Candida mogii. Product yields, Yp/s, of 0.41 and 0.37 g/g and cellular yields, Yx/s, of 0.24 and 0.13 g/g, respectively, were obtained using the two types of resin-treated hydrolyzates.
authors.affiliation: Biotechnology Department, Faenquil-Lorena-SP 12.600.000, UFV-Vicosa-MG-36.571.000, Brazil.
authors.forename: Ismael
authors.initials: I
authors.lastname: Maciel de Mancilha
authors.forename: M Nazmul
authors.initials: MN
authors.lastname: Karim
mesh_terms: D002175:Candida / Q000378:metabolism*; D018929:Cell Culture Techniques / Q000379:methods; D003470:Culture Media / Q000737:chemistry* / Q000378:metabolism*; D005662:Furaldehyde / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification; D006868:Hydrolysis; D007475:Ion Exchange Resins / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry / Q000382:microbiology; D018547:Plant Stems / Q000737:chemistry / Q000382:microbiology; D014993:Xylitol / Q000096:biosynthesis*; D003313:Zea mays / Q000737:chemistry* / Q000382:microbiology*
chemical_list: D003470:Culture Media; D007475:Ion Exchange Resins; C008046:5-hydroxymethylfurfural; D005662:Furaldehyde; D014993:Xylitol