title: Kinetic studies on the product inhibition of enzymatic lignocellulose hydrolysis.
abstract: In order to understand the product inhibition of enzymatic lignocellulose hydrolysis, the enzymatic hydrolysis of pretreated rice straw was carried out over an enzyme loading range of 2 to 30 FPU/g substrate, and the inhibition of enzymatic hydrolysis was analyzed kinetically based on the reducing sugars produced. It was shown that glucose, xylose, and arabinose were the main reducing sugar components contained in the hydrolysate. The mass ratio of glucose, xylose, and arabinose to the total reducing sugars was almost constant at 52.0%, 29.7% and 18.8%, respectively, in the enzyme loading range. The reducing sugars exerted competitive inhibitory interferences to the enzymatic hydrolysis. Glucose, xylose, and arabinose had a dissociation constant of 1.24, 0.54 and 0.33 g/l, respectively. The inhibitory interferences by reducing sugars were superimposed on the enzymatic hydrolysis. The enzymatic hydrolysis could be improved by the removal of the produced reducing sugars from hydrolysate.
authors.affiliation: State Key Laboratory of Materials-Oriented Chemical Engineering, College of Food Science and Light Industrial Technology, Nanjing University of Technology, Nanjing, Jiangsu 210009, China. ylmiao@njut.edu.cn
authors.forename: Yelian
authors.initials: Y
authors.lastname: Miao
authors.forename: Jie Yu
authors.initials: JY
authors.lastname: Chen
authors.forename: Xuejian
authors.initials: X
authors.lastname: Jiang
authors.forename: Zhou
authors.initials: Z
authors.lastname: Huang
mesh_terms: D055162:Biocatalysis; D002480:Cellulase / Q000737:chemistry* / Q000378:metabolism; D005656:Fungal Proteins / Q000737:chemistry* / Q000378:metabolism; D005947:Glucose / Q000378:metabolism; D006868:Hydrolysis; D007700:Kinetics; D008031:Lignin / Q000737:chemistry / Q000378:metabolism*; D012275:Oryza / Q000737:chemistry* / Q000378:metabolism*; D014242:Trichoderma / Q000737:chemistry / Q000201:enzymology*; D014994:Xylose / Q000378:metabolism
chemical_list: D005656:Fungal Proteins; C036909:lignocellulose; D008031:Lignin; D014994:Xylose; D002480:Cellulase; D005947:Glucose